Publications
| Title | Abstract | Year(sorted ascending) Filter | PMID Filter |
|---|
| efficacy of multiple applications of oxamyl and phenamiphos for control of pratylenchus penetrans in birdsfoot trefoil. | preplant soil applications of granular phenamiphos effectively reduced pratytenchus penetrans in soil during the seeding year and 1 year after, and in the roots of birdsfoot trefoil 2 years after seeding. forage yields were increased in the season following application of phenamiphos, but stands of plants/m(2) were not greater (p = 0.05) than those in the checks 1 and 2 years after treatment. additional spring applications of phenamiphos 1 and 2 years after seeding further reduced numbers of nem ... | 1976 | 19308245 |
| chemotaxis of rhizobium spp. to a glycoprotein produced by birdsfoot trefoil roots. | rhizobium spp. show chemotaxis to plant root exudates. a glycoprotein has been isolated from the root exudates of birdsfoot trefoil, lotus corniculatus, which, at micromolar concentrations, attracts six strains of rhizobia. this glycoprotein has been given the trivial name trefoil chemotactin and contains approximately twice as much protein as carbohydrate. gel filtration of trefoil chemotactin on a bio-gel a-1.5m column gave a molecular weight of approximately 60,000. trefoil chemotactin repres ... | 1977 | 17776952 |
| in vitro digestion of bloat-safe and bloat-causing legumes by rumen microorganisms: gas and foam production. | leaves of three bloat-safe legumes -- birdsfoot trefoil (lotus corniculatus l.), sainfoin (onobrychis viciaefolia scop.), and cicer milkvetch (astralagus cicer l.) -- and of three bloat-causing legumes -- alfalfa (medicago sativa l.), red clover (trifolium pratense l.), and white clover (trifolium repens l.) -- were incubated with strained rumen fluid or with mixed rumen fluid and solids. gas released was measured during the early period (0 to 22 h) of this in vitro digestion. gas volume was gre ... | 1980 | 7419778 |
| transformation of forage legumes using agrobacterium tumefaciens. | galls were induced in six species of forage legumes following inoculation with wild-type strains of a. tumefaciens. the plant species was more influential than the bacterial strain in determining the type of tumour produced. inoculation of medicago sativa resulted in small, disorganised tumours. the three trifolium species, t. repens, t. hybridum and t. pratense, formed galls which tended to produce roots and both onobrychis viciifolia and lotus corniculatus produced teratomatous galls. the shoo ... | 1986 | 24247771 |
| why do honeybees reject certain flowers? | honeybees often approach flowers of lotus corniculatus and then fly away without attempting to extract nectar. these rejected flowers contained 41% less nectar than my random sample. the accepted flowers contained 24% more nectar than my random sample. the differences among these three flower-groups were due to differences in the percent of empty flowers in each group rather than the differences in the absolute amount of nectar. honeybees increased their foraging efficiency by accepting less emp ... | 1986 | 28311617 |
| 5' analysis of the soybean leghaemoglobin lbc(3) gene: regulatory elements required for promoter activity and organ specificity. | the soybean leghaemoglobin lbc(3) gene promoter was analysed in transgenic lotus corniculatus plants. hybrid-promoter constructions and 5' deletions were studied using chimeric genes composed of the various promoters, the chloramphenicol acetyltransferase (cat) coding sequence and the lbc(3) 3' flanking region. a 5' bal31 deletion series mapped a strong positive regulatory element between -1100 and -950. a weaker element located between -230 and -170 defined the minimum 5' region required for de ... | 1987 | 16453808 |
| the effect of condensed tannins on the site of digestion of amino acids and other nutrients in sheep fed on lotus corniculatus l. | sheep were used to evaluate the nutritional consequences of a low condensed-tannin concentration (22 g/kg dry matter (dm)) in lotus (lotus corniculatus l.) (control group) compared with lotus given to sheep receiving intraruminal polyethylene glycol (peg) infusion (peg group). peg selectively binds to tannins and prevents tannins from binding proteins. dm intakes (1430 (se 28) g/d) and digestibility of energy (663 (se 4.5) kj/mj intake) were similar for both groups but the apparent digestion of ... | 1987 | 3801377 |
| expression of a complete soybean leghemoglobin gene in root nodules of transgenic lotus corniculatus. | the complete soybean leghemoglobin lbc(3) gene was transferred into the legume lotus corniculatus using an agrobacterium rhizogenes vector system. organ-specific expression of the soybean gene was observed in root nodules formed on regenerated transgenic plants after infection with rhizobium loti. the primary transcript was processed in the same way as in soybean nodules and the resulting mrna was translated into lbc(3) protein. quantitative determination of the lbc(3) protein in nodules of tran ... | 1987 | 16593870 |
| hairy roots are more sensitive to auxin than normal roots. | responses to auxin of lotus corniculatus root tips or protoplasts transformed by agrobacterium rhizogenes strains 15834 and 8196 were compared to those of their normal counterparts. three different types of experiments were performed, involving long-term, medium-term, or short-term responses to a synthetic auxin, 1-naphthaleneacetic acid. root tip elongation, proton excretion by root tips, and transmembrane electrical potential difference of root protoplasts were measured as a function of exogen ... | 1988 | 16593928 |
| root nodule specific gene regulation: analysis of the soybean nodulin n23 gene promoter in heterologous symbiotic systems. | the nodulin n23 gene promoter was analysed in transgenic plants using the chloramphenicol acetyltransferase (cat) coding sequence as a reporter. a 5' flanking region of less than 1 kb was sufficient for the organ-specific expression of a chimeric n23-cat-3'lbc3 gene in root nodules formed on lotus corniculatus and trifolium repens after infection by their respective rhizobium symbionts. expression was regulated at the level of rna in both species of transgenic plants. promoter deletion analysis ... | 1988 | 3340542 |
| functional analysis of the sesbania rostrata leghemoglobin glb3 gene 5'-upstream region in transgenic lotus corniculatus and nicotiana tabacum plants. | expression of the sesbania rostrata leghemoglobin glb3 gene was analyzed in transgenic lotus corniculatus and tobacco plants harboring chimeric glb3-uida (gus) gene fusions to identify cis-acting elements involved in nodule-specific gene expression and general transcriptional control. a 1.9-kilobase fragment of the glb3 5'-upstream region was found to direct a high level of nodule-specific beta-glucuronidase (gus) activity in l. corniculatus, restricted to the rhizobium-infected cells of the nod ... | 1990 | 2136628 |
| nonlegume hemoglobin genes retain organ-specific expression in heterologous transgenic plants. | hemoglobin genes from the nitrogen-fixing nonlegume parasponia andersonii and the related non-nitrogen-fixing nonlegume trema tomentosa have been isolated [landsmann et al. (1986). nature 324, 166-168; bogusz et al. (1988). nature 331, 178-180]. the promoters of these genes have been linked to a beta-glucuronidase reporter gene and introduced into both the nonlegume nicotiana tabacum and the legume lotus corniculatus. both promoters directed root-specific expression in transgenic tobacco. when t ... | 1990 | 2136637 |
| interdependence and nodule specificity of cis-acting regulatory elements in the soybean leghemoglobin lbc3 and n23 gene promoters. | the qualitative and quantitative contributions of four separate cis-acting dna elements controlling the root nodule-specific soybean leghemoglobin lbc3 gene were analyzed in transgenic lotus corniculatus plants. expression from internal deletions in the 5' region between positions -49 and -1956 was monitored from a cat reporter gene. the strong positive element (spe; -1090, -947) responsible for high-level expression was demonstrated to be an organ-specific element by deleting proximal nodule-sp ... | 1990 | 2338938 |
| high sensitivity to auxin is a common feature of hairy root. | the responses to auxin of lycopersicon esculentum roots transformed by (t(l)+t(r))-dna of the ri plasmid of agropine-type agrobacterium rhizogenes strain 15834 and catharanthus trichophyllus roots transformed by the (t(l)+t(r))-dna, and by t(l)- or t(r)- dna alone of the same bacterial strain were compared to that of their normal counterparts. the transmembrane electrical potential difference of root protoplasts was measured as a function of the concentration of exogenous naphthalene acetic acid ... | 1990 | 16667748 |
| variation in a single protoplast- and seed-derived population of lotus corniculatus l. | lotus comiculatus l. is a widely cultivated, outbreeding, leguminous forage crop. seventy-one plants, most of which were tetraploid, were regenerated from calli derived from a single protoplast. their morphological and agronomic traits were evaluated and compared with those of the seed-produced population. the variances of most of the traits in the protoplast-derived (protoclonal) population were smaller than those of the seed-produced population. mean values of all the traits of the protoclonal ... | 1990 | 24221102 |
| additional hosts for the ring nematode, criconemella xenoplax. | some common legumes and weeds indigenous to peach orchards in south carolina were tested in greenhouse experiments to determine their host suitability for criconemella xenoplax. legumes that were hosts for the nematode were dwarf english trefoil (lotus corniculatus var. arvensis), big trefoil (l. uliginosis), birdsfoot trefoil (l. corniculatus), narrowleaf birdsfoot trefoil (l. tenuis), ball clover (trifolium nigrescens), rose clover (t. hirtum), subterranean clover (t. subterraneum), striate le ... | 1990 | 19287692 |
| a two-component nodule-specific enhancer in the soybean n23 gene promoter. | the two positive cis elements in the soybean nodulin n23 gene promoter were investigated in transgenic lotus corniculatus plants and shown to constitute a two-component nodule-specific enhancer. equal quantitative contributions from the two components were suggested by the similar expression level of chimeric n23-chloramphenicol acetyltransferase genes after deletion of either the distal positive element (pe-a, -320 to -298) or the proximal positive element (pe-b, -257 to -165). a combined effec ... | 1991 | 1820821 |
| phenylpropanoid defence responses in transgenic lotus corniculatus 1. glutathione elicitation of isoflavan phytoalexins in transformed root cultures. | when agrobacterium rhizogenes transformed root cultures of lotus corniculatus were treated with glutathione, isoflavan phytoalexins accumulated in both tissue and culture medium. this accumulation of phytoalexins was preceded by a transient increase in the activity of phenylalanine ammonia lyase (pal). elicitation of pal occurred throughout the growth curve of lotus 'hairy roots' and in different sectors of transformed root material. | 1991 | 24221394 |
| ammonia-regulated expression of a soybean gene encoding cytosolic glutamine synthetase in transgenic lotus corniculatus. | a full-length cdna clone encoding cytosolic glutamine synthetase (gs), expressed in roots and root nodules of soybean, was isolated by direct complementation of an escherichia coli gln a- mutant. this sequence is induced in roots by the availability of ammonia. a 3.5-kilobase promoter fragment of a genomic clone (lambda gs15) corresponding to this cdna was isolated and fused with a reporter [beta-glucuronidase (gus)] gene. the gs-gus fusion was introduced into a legume (lotus corniculatus) and a ... | 1991 | 1688099 |
| functional analysis of the promoter region of a nodule-enhanced glutamine synthetase gene from phaseolus vulgaris l. | the 5'-flanking region of gln-gamma, the nodule-enhanced glutamine synthetase gene from phaseolus vulgaris l., has been analysed for cis-regulatory elements using a series of 5' deletions and hybrid gln-gamma:: camv 35s promoters. the promoters were fused to the uida reporter gene and their activities tested in two heterologous expression systems. in the first system, the chimaeric genes were transferred to lotus corniculatus l. using agrobacterium rhizogenes and their expression was studied in ... | 1992 | 1353692 |
| forcing expression of a soybean root glutamine synthetase gene in tobacco leaves induces a native gene encoding cytosolic enzyme. | glutamine synthetase (gs; ec 6.3.1.2) is present in different subcellular compartments in plants. it is located in the cytoplasm in root and root nodules while generally present in the chloroplasts in leaves. the expression of gs gene(s) is enhanced in root nodules and in soybean roots treated with ammonia. we have isolated four genes encoding subunits of cytosolic gs from soybean (glycine max l. cv. prize). promoter analysis of one of these genes (gs15) showed that it is expressed in a root-spe ... | 1992 | 1356501 |
| gene flow inferred from seed dispersal and pollinator behaviour compared to dna analysis of restriction site variation in a patchy population of lotus corniculatus l. | gene flow was investigated in a natural population of lotus corniculatus l. (fabaceae) using a combination of pollen and seed dispersal studies and a recombinant dna technique. the population is spatially heterogeneous and grows with empetrum nigrum. l. corniculatus is pollinated by the pollen-collecting bumblebee bombus lapidarius l. most pollinator flights occurred within patches, as bees usually visit nearest-neighbour plants, show no marked directionality, and forage mostly within patches. g ... | 1992 | 28312883 |
| minimal enhancer elements of the leghemoglobin lba and lbc3 gene promoters from glycine max l. have different properties. | the characteristics of the soybean leghemoglobin lba gene promoter were analyzed and important promoter elements from the lba and lbc3 promoters were compared using transgenic lotus corniculatus plants. a 5' deletion analysis of the lba promoter delimited two cis-acting elements controlling expression: a distal positive element (-1254, -884) required for expression and a proximal element (-285, -60) essential for full-level activity. in contrast to the corresponding region of the lbc3 promoter, ... | 1993 | 8400139 |
| effects of condensed tannins on endoglucanase activity and filter paper digestion by fibrobacter succinogenes s85. | the effect of condensed tannins from birdsfoot trefoil (lotus corniculatus l.) on the cellulolytic rumen bacterium fibrobacter succinogenes s85 was examined. condensed tannins inhibited endoglucanase activity in the extracellular culture fluid, at concentrations as low as 25 mug ml. in contrast, cell-associated endoglucanase activity increased in concentrations of condensed tannins between 100 and 300 mug ml. inhibition of endoglucanase activity in both the extracellular and the cell-associated ... | 1993 | 16348990 |
| soybean nodulin-26 gene encoding a channel protein is expressed only in the infected cells of nodules and is regulated differently in roots of homologous and heterologous plants. | nodulin-26 (n-26) is a major peribacteroid membrane protein in soybean root nodules. the gene encoding this protein is a member of an ancient gene family conserved from bacteria to humans. n-26 is specifically expressed in root nodules, while its homolog, soybean putative channel protein, is expressed in vegetative parts of the plant, with its highest level in the root elongation zone. analysis of the soybean n-26 gene showed that its four introns mark the boundaries between transmembrane domain ... | 1993 | 7689881 |
| the quest for a herbal contraceptive. | an oral herbal contraceptive would allow couples control their fertility without consulting a health worker, which in turn would likely markedly increase the number of couples practicing family planning. other advantages of such a contraceptive would include the familiarity rural people have with herbal medicines, the fewer side effects associated with herbal preparations, their ready availability from local sources, and protection of privacy. there are many references to plants in india with ... | 1993 | 8241931 |
| interaction of a rhizobial dna-binding protein with the promoter region of a plant leghemoglobin gene. | a nucleotide sequence was identified approximately 650 bp upstream of the sesbania rostrata leghemoglobin gene srglb3 start codon, which interacts specifically with a proteinaceous dna-binding factor found in nodule extracts but not in extracts from leaves or roots. the binding site for this factor was delimited using footprinting techniques. the dna-binding activity of this factor was found to be heat stable, dependent on divalent cations, and derived from the (infecting) azorhizobium caulinoda ... | 1993 | 8278541 |
| the effect of condensed tannins in lotus corniculatus on plasma metabolism of methionine, cystine and inorganic sulphate by sheep. | fresh lotus corniculatus containing 27 g extractable condensed tannin (ct)/kg dry matter (dm) and 8 g bound ct/kg dm was fed at hourly intervals to sheep held in metabolism cages to study the effects of ct on nutrient digestion and on metabolism of methionine, cystine and inorganic sulphate in plasma. polyethylene glycol (peg) was continuously infused into the rumen of half the sheep to remove the effects of ct. principal measurements in the two groups were plasma irreversible loss (irl) rate an ... | 1994 | 7827012 |
| the expression of a chimeric phaseolus vulgaris nodulin 30-gus gene is restricted to the rhizobially infected cells in transgenic lotus corniculatus nodules. | in phaseolus vulgaris there is a nodulin family, npv30, of ca. 30 kda, as detected in an in vitro translation assay [2]. we isolated a gene (npv30-1) for one of the members of this family. the nucleotide sequence of the promoter of npv30-1 contains nodule-specific motifs common to other late nodulin genes. the promoter was fused to the gus reporter gene; this chimeric fusion was introduced into lotus corniculatus via agrobacterium rhizogenes transformation. gus activity was only detected in the ... | 1994 | 7858234 |
| proanthocyanidins inhibit hydrolysis of leaf proteins by rumen microflora in vitro. | proanthocyanidins (condensed tannins; pa) purified from the leaves of forage legumes trifolium arvense, lotus pedunculatus, lotus corniculatus, dorycnium rectum, coronilla varia, onobrychis viciifolia, or hedysarum coronarium, were added to soluble lucerne (medicago sativa) leaf protein and incubated with strained rumen fluid in vitro. fractions were collected and frozen immediately. denatured proteins were fractionated by sodium dodecylsulphate-polyacrylamide gel electrophoresis (sds-page), sta ... | 1994 | 8031741 |
| a protein binding at-rich sequence in the soybean leghemoglobin c3 promoter is a general cis element that requires proximal dna elements to stimulate transcription. | a nodule nuclear factor, nat2, interacts with two at-rich binding sites (nat2 bs1 and nat2 bs2) in the soybean leghemoglobin (lb) c3 promoter. in transgenic lotus corniculatus nodules, an oligonucleotide containing nat2 bs1 activated an inactive -159 lbc3 promoter when placed immediately upstream of the promoter. the activation was independent of the orientation of nat2 bs1 but was dependent on its position in the promoter. the abilities of different mutated binding sites to activate expression ... | 1994 | 8038605 |
| effect of condensed tannins from birdsfoot trefoil on endoglucanase activity and the digestion of cellulose filter paper by ruminal fungi. | the ruminal fungi neocallimastix frontalis re1, neocallimastix patriciarum 27, piromyces communis 22, and orpinomyces joyonii 19-2 were examined for their ability to digest filter paper in the presence of condensed tannins from birdsfoot trefoil (lotus corniculatus l.). for all four fungi, inhibition of endoglucanases was evident at 100 micrograms condensed tannins.ml-1 with nearly complete inhibition at 300 micrograms condensed tannins.ml-1. at 100 and 200 micrograms condensed tannins.ml-1, the ... | 1994 | 8039053 |
| site-specific mutagenesis of the nodule-infected cell expression (nice) element and the at-rich element atre-bs2* of the sesbania rostrata leghemoglobin glb3 promoter. | sesbania rostrata leghemoglobin glb3 (srglb3) promoter sequences responsible for expression in infected cells of transgenic lotus corniculatus nodules were delimited to a 78-bp dral-hinfl fragment. this region, which is located between coordinates -194 to -116 relative to the start codon of the srglb3 gene, was named the nodule-infected cell expression (nice) element. insertion of the nice element into the truncated nopaline synthase promoter was found to confer a nodule-specific expression patt ... | 1994 | 8180496 |
| genetic modification of condensed tannin biosynthesis in lotus corniculatus. 1. heterologous antisense dihydroflavonol reductase down-regulates tannin accumulation in "hairy root" cultures. | an antisense dihydroflavonol reductase (dfr) gene-construct made using the cdna for dfr from antirrhinum majus was introduced into the genome of a series of clonal genotypes of lotus corniculatus via agrobacterium rhizogenes. after initial screening, 17 antisense and 11 control transformation events were analysed and tannin levels found to be reduced in antisense root cultures. the effect of this antisense construct, (pmaj2), which consisted of the 5' half of the dfr cdna sequence, was compared ... | 1994 | 24190536 |
| oxygen-induced membrane depolarizations in legume root nodules (possible evidence for an osmoelectrical mechanism controlling nodule gas permeability). | various stresses trigger rapid and reversible decreases in the o2 permeability (po) of legume root nodules. several possible mechanisms have been proposed, but no supporting data have previously been presented that meet the requirements for both rapidity and reversibility. stomatal regulation of gas permeability in leaves involves electrically driven fluxes of inorganic osmoticants, so we investigated the possibility of a somewhat similar mechanism in nodules. we used microelectrodes to monitor ... | 1995 | 12228468 |
| nitrate effects on nodule oxygen permeability and leghemoglobin (nodule oximetry and computer modeling). | two current hypotheses to explain nitrate inhibition of nodule function both involve decreased o2 supply for respiration in support of n2 fixation. this decrease could result from either (a) decreased o2 permeability (po) of the nodule cortex, or (b) conversion of leghemoglobin (lb) to an inactive, nitrosyl form. these hypotheses were tested using alfalfa (medicago sativa l. cv weevlchek) and birdsfoot trefoil (lotus corniculatus l. cv fergus) plants grown in growth pouches under controlled cond ... | 1995 | 12228439 |
| identification of several soybean cytosolic glutamine synthetase transcripts highly or specifically expressed in nodules: expression studies using one of the corresponding genes in transgenic lotus corniculatus. | a dna fragment containing sequences hybridizing to the 5' region of gs15, a gene encoding soybean cytosolic glutamine synthetase, was isolated from a soybean genomic library. mapping and partial sequence analysis of the genomic clone revealed that it encodes a cytosolic gs gene, gs21, which is different from gs15. in parallel, a number of cdna clones encoding cytosolic gs were isolated using the coding region of pgs20 as a probe (pgs20 is a cdna clone which corresponds to a transcript of the gs1 ... | 1995 | 7865779 |
| symbiotic and nonsymbiotic hemoglobin genes of casuarina glauca. | casuarina glauca has a gene encoding hemoglobin (cashb-nonsym). this gene is expressed in a number of plant tissues. casuarina also has a second family of hemoglobin genes (cashb-sym) expressed at a high level in the nodules that casuarina forms in a nitrogen-fixing symbiosis with the actinomycete frankia. both the nonsymbiotic and symbiotic genes retained their specific patterns of expression when introduced into the legume lotus corniculatus. we interpret this finding to mean that the controls ... | 1995 | 7756831 |
| nodulating strains of rhizobium loti arise through chromosomal symbiotic gene transfer in the environment. | rhizobia were isolated from nodules off a stand of lotus corniculatus established with a single inoculant strain, icmp3153, 7 years earlier in an area devoid of naturalized rhizobium loti. the isolates showed diversity in growth rate, spe i fingerprint of genomic dna, and hybridization pattern to genomic dna probes. the 19% of isolates that grew at the same rate as strain icmp3153 were the only isolates that had the same fingerprint as strain icmp3153. sequencing of part of the 16s rrna gene of ... | 1995 | 7568057 |
| pasture management strategies for reducing the risk of legume bloat in cattle. | results from two decades (1973-1993) of bloat research at kamloops are reviewed. the trials were conducted with groups of ruminally fistulated cattle either grazing or fed daily fresh-cut alfalfa (medicago sativa) herbage. studies were conducted during the growing season (may to september) and in the fall (october and november). the alfalfa was usually in the vegetative to early bloom stages of growth. visual assessments of bloat severity on a scale of 1 to 5 were made .5 to 2 h after feeding st ... | 1995 | 7665381 |
| agrobacterium rhizogenes as a vector for transforming higher plants. application in lotus corniculatus transformation. | 1995 | 8563829 | |
| suspected photosensitisation in lambs grazing birdsfoot trefoil (lotus corniculatus). | suspected photosensitisation occurred in three groups of lambs grazing birdsfoot trefoil (lotus corniculatus c.v. grasslands goldie). in one group, sucking lambs aged about 10 weeks, grazing birdsfoot trefoil, developed skin lesions while lambs of a similar age and from the same flock grazing lucerne (medicago sativa) or a mixed sward of both species showed no signs of photosensitisation. affected lambs had lesions on their backs and ears. in a few animals the tips of the ears were shortened by ... | 1995 | 16031826 |
| four unnamed species of nonsymbiotic rhizobia isolated from the rhizosphere of lotus corniculatus. | previously, we found that genetically diverse rhizobia nodulating lotus corniculatus at a field site devoid of naturalized rhizobia had symbiotic dna regions identical to those of icmp3153, the inoculant strain used at the site (j. t. sullivan, h. n. patrick, w. l. lowther, d. b. scott, and c. w. ronson, proc. natl. acad. sci. usa 92:8985-8989, 1995). in this study, we characterized seven nonsymbiotic rhizobial isolates from the rhizosphere of l. corniculatus. these included two from plants at t ... | 1996 | 8702274 |
| differential expression of the sesbania rostrata leghemoglobin glb3 gene promoter in transgenic legume and non-legume plants. | the involvement of the sesbania rostrata glb3 gene promoter nice (nodule-infected cell expression) element in root-enhanced expression of 5'-srglb3-uida-3'nos chimeric gene was investigated in transgenic nicotiana tabacum plants. the full-length wild-type srglb3 promoter directed root meristem-enhanced expression in transgenic tobacco plants. the expression pattern of nine selected srglb3 promoter mutations in the nice element was examined in transgenic tobacco plants and compared with the patte ... | 1996 | 8806425 |
| novel and complex chromosomal arrangement of rhizobium loti nodulation genes. | a mutational and structural analysis of rhizobium loti nodulation genes in strains nzp2037 and nzp2213 was carried out. unlike the case with other rhizobium strains examined to date, nodb was found on an operon separate from nodacij. sequence analysis of the nodacij and nodb operon regions confirm that r. loti common nod genes have a gene organization different from that of other rhizobium spp. at least 4 copies of nodd-like sequences were identified in r. loti. the complete nucleotide sequence ... | 1996 | 8850088 |
| a system for tissue-specific copper-controllable gene expression in transgenic plants: nodule-specific antisense of aspartate aminotransferase-p2. | a vector system, based on copper controllable gene expression, has been developed to give control over place as well as time of expression of an introduced gene. this system consists of two elements: (1) the yeast ace1 gene encoding a metallo-regulatory transcription factor, ace1, under control of either an organ-specific or a constitutive promoter; and (2) a gene of interest under control of a chimaeric promoter consisting of the 46 bp tata fragment of the camv 35s rna promoter linked to four r ... | 1996 | 8866892 |
| controlling internal parasites in grazing ruminants without recourse to anthelmintics: approaches, experiences and prospects. | interest in ways of raising stock without using anthelmintics has been stimulated by the desire for intensive grazing systems to adopt more sustainable methods of internal parasite control and by potential premiums for "organic" produce. this requires grazing management systems which are practicable and achieve levels of parasite control sufficient to meet realistic production objectives. this paper will summarise 3 years experience of lamb and cattle production without a recourse to anthelminti ... | 1996 | 8923145 |
| cell-specific expression of the promoters of two nonlegume hemoglobin genes in a transgenic legume, lotus corniculatus. | the promoters of the hemoglobin genes from the nitrogen-fixing tree parasponia andersonii and the related nonnitrogen-fixing trema tomentosa both confer beta-glucuronidase reporter gene expression to the central zone of the nodules of a transgenic legume, lotus corniculatus. beta-glucuronidase expression was high in the uninfected interstitial cells and parenchyma of the surrounding boundary layer and was low in the rhizobium-infected cells. this contrasts with the expression of both the p. ande ... | 1997 | 9008386 |
| overexpression of a soybean gene encoding cytosolic glutamine synthetase in shoots of transgenic lotus corniculatus l. plants triggers changes in ammonium assimilation and plant development. | a soybean cytosolic glutamine synthetase gene (gs15) was fused with the constitutive 35s cauliflower mosaic virus (camv) promoter in order to direct overexpression in lotus corniculatus l. plants. following transformation with agrobacterium rhizogenes, eight independent lotus transformants were obtained which synthesized additional cytosolic glutamine synthetase (gs) in the shoots. to eliminate any interference caused by the t-dna from the ri plasmid, three primary transformants were crossed wit ... | 1997 | 9151446 |
| expression of an antirrhinum dihydroflavonol reductase gene results in changes in condensed tannin structure and accumulation in root cultures of lotus corniculatus (bird's foot trefoil). | condensed tannins (proanthocyanidins) are an important factor in the nutritive and dietary quality of many forage crops. we report here experiments aimed at altering the levels and monomer composition of condensed tannins (cts) in 'hairy root' cultures of lotus corniculatus (bird's foot trefoil) using genetic manipulation. an antirrhinum majus dihydroflavonol reductase (dfr) cdna was expressed in sense in l. corniculatus and ct levels in transgenic root cultures were analysed. two co-transformed ... | 1997 | 9349268 |
| differential modification of flavonoid and isoflavonoid biosynthesis with an antisense chalcone synthase construct in transgenic lotus corniculatus. | three clonal genotypes of lotus corniculatus l. (bird's foot trefoil) were transformed with an antisense chalcone synthase (chs) gene construct made using a stress induced chs17 cdna from phaseolus vulgaris under the control of the constitutive camv 35s promoter and nos terminator via agrobacterium rhizogenes. after initial screening, ten antisense and five control co-transformation events from each recipient clonal genotype were analysed. after elicitation with glutathione, the level of tannin ... | 1997 | 9349273 |
| genetic manipulation of condensed tannins in higher plants. ii. analysis of birdsfoot trefoil plants harboring antisense dihydroflavonol reductase constructs | we have produced and analyzed transgenic birdsfoot trefoil (lotus corniculatus l.) plants harboring antisense dihydroflavonol reductase (as-dfr) sequences. in initial experiments the effect of introducing three different antisense antirrhinum majus l. dfr constructs into a single recipient genotype (s50) was assessed. there were no obvious effects on plant biomass, but levels of condensed tannins showed a statistical reduction in leaf, stem, and root tissues of some of the antisense lines. trans ... | 1998 | 9501146 |
| lotus corniculatus nodulation specificity is changed by the presence of a soybean lectin gene | plant lectins have been implicated as playing an important role in mediating recognition and specificity in the rhizobium-legume nitrogen-fixing symbiosis. to test this hypothesis, we introduced the soybean lectin gene le1 either behind its own promoter or behind the cauliflower mosaic virus 35s promoter into lotus corniculatus, which is nodulated by r. loti. we found that nodulelike outgrowths developed on transgenic l. corniculatus plant roots in response to bradyrhizobium japonicum, which nod ... | 1998 | 9707526 |
| production, faecal egg counts and worm burdens of ewe lambs which grazed six contrasting forages. | lambs were grazed on monospecific swards of one of six forages, some containing condensed tannins (ct); sulla (hedysarum coronarium), lotus corniculatus and l. pedunculatus and some without ct (lucerne (medicago sativa), plantain (plantago lanceolata) and a ryegrass/white clover pasture (lolium perenne/trifolium repens)) to evaluate effects of forage type on gastrointestinal nematode burdens, faecal egg count as well as liveweight gain (lwg), wool growth and dag formation over a 42-day period. a ... | 1998 | 9877067 |
| effects of elevated co2 on flowering phenology and nectar production of nectar plants important for butterflies of calcareous grasslands. | effects of elevated co2 on flowering phenology and nectar production were investigated in trifolium pratense, lotus corniculatus, scabiosa columbaria, centaurea jacea and betonica officinalis, which are all important nectar plants for butterflies. in glasshouse experiments, juvenile plants were exposed to ambient (350 μl l(-1)) and elevated (660 μl l(-1)) co2 concentrations for 60-80 days. elevated co2 significantly enhanced the development of flower buds in c. jacea. b. officinalis flowered ear ... | 1998 | 28307818 |
| a field study of the effects of elevated co(2) on plant biomass and community structure in a calcareous grassland. | the effects of elevated co(2) on plant biomass and community structure have been studied for four seasons in a calcareous grassland in northwest switzerland. this highly diverse, semi-natural plant community is dominated by the perennial grass bromus erectus and is mown twice a year to maintain species composition. plots of 1.3 m(2) were exposed to ambient or elevated co(2) concentrations (n = 8) using a novel co(2) exposure technique, screen-aided co(2) control (sacc) starting in march 1994. in ... | 1999 | 20135159 |
| a strong constitutive positive element is essential for the ammonium-regulated expression of a soybean gene encoding cytosolic glutamine synthetase. | in order to identify important promoter elements controlling the ammonium-regulated expression of the soybean gene gs15 encoding cytosolic glutamine synthetase, a series of 5' promoter deletions were fused to the gus reporter gene. to allow the detection of positive and negative regulatory elements, a series of 3' deletions were fused to a -90 camv 35s promoter fragment placed upstream of the gus gene. both types of construct were introduced into lotus corniculatus plants and soybean roots via a ... | 1999 | 10092182 |
| the implications of condensed tannins on the nutritive value of temperate forages fed to ruminants. | new methodology for measuring forage condensed tannin (ct) content is described and the effects of ct upon forage feeding and nutritive value for ruminant animals are reviewed. ct react with forage proteins in a ph-reversible manner, with reactivity determined by the concentration, structure and molecular mass of the ct. increasing concentrations of ct in lotus corniculatus and lotus pedunculatus reduce the rates of solubilization and degradation of fraction 1 leaf protein in the rumen and incre ... | 1999 | 10999013 |
| symbiosis of astragalus cicer with its microsymbionts: partial nodc gene sequence, host plant specificity, and root nodule structure. | astragalus cicer (cicer milkvetch) nodule bacteria were investigated for host plant specificity and partial nodc gene sequences, whilst their native host was studied for the microscopic structure of root nodules. the strains under investigation formed nodules not only on the original host but also on astragalus glycyphyllos, astragalus sinicus, lotus corniculatus, and phaseolus vulgaris. the nodules induced on the cicer milkvetch were classified as indeterminate and characterized by apical, pers ... | 2000 | 11016697 |
| the effect of birdsfoot trefoil (lotus corniculatus) and white clover (trifolium repens) in mixed pasture swards on incoming and established nematode infections in young lambs. | lotus corniculatus l., a leguminous plant containing condensed tannins, is now being evaluated in sweden as a component of mixed pastures. this is because of its high nutritive value, palatability, modest requirement for water, calcium and phosphorous and particularly because it has the ability to survive harsh weather conditions that typify northern scandinavia. this trial was undertaken to assess the possible parasitological benefits of using l. corniculatus when fed as a minor component in a ... | 2000 | 11234969 |
| a new mesorhizobium loti hambi 1129 phage isolated from polish soil. | phage a1 isolated from the rhizosphere of lotus corniculatus was studied. it had a very narrow host range, as it was active only against mesorhizobium loti hambi 1129. phage a1 was classified as belonging to c bradley's group bacteriophages. the latent period of a1 was 120-130 min and a burst size 13-17 particles per cell. the nature of the phage receptor was examined. lipopolysaccharide from the phage-sensitive strain inactivated phage a1 in contrast to lps from the phage-resistant bacteria. pu ... | 2000 | 10706666 |
| lupine leghemoglobin i: expression in transgenic lotus and tobacco tissues. | the proximal parts of the promoters of the genes for symbiotic-type hemoglobins are generally conserved, but the promoter of the lbi gene of lupine (lulbi) shows some unusual structural features. it lacks typical organ-specific elements characteristic of all the leghemoglobin gene promoters described thus far. we have analysed its functional activity in transgenic lotus corniculatus. a fusion construct between the lbi promoter and the gus reporter gene was expressed mainly in the central zone of ... | 2000 | 10778735 |
| the effect of condensed tannins from seven herbages on trichostrongylus colubriformis larval migration in vitro. | the effects of condensed tannins (ct) extracted from seven forages on the motility of the economically important nematode, trichostrongylus colubriformis (giles, 1892), were evaluated by using a larval migration inhibition (lmi) assay. the assay involved incubation of third stage (l3) exsheathed t. colubriformis larvae with ct extracted from lotus pedunculatus, lotus corniculatus, sulla (hedysarum coronarium), sainfoin (onobrychis viciifolia), dorycnium rectum, dorycnium pentaphyllum and dock (r ... | 2000 | 10833014 |
| characterization of an atrazine-degrading pseudaminobacter sp. isolated from canadian and french agricultural soils. | atrazine, a herbicide widely used in corn production, is a frequently detected groundwater contaminant. fourteen bacterial strains able to use this herbicide as a sole source of nitrogen were isolated from soils obtained from two farms in canada and two farms in france. these strains were indistinguishable from each other based on repetitive extragenic palindromic pcr genomic fingerprinting performed with primers eric1r, eric2, and boxa1r. based on 16s rrna sequence analysis of one representativ ... | 2000 | 10877767 |
| effect of forage legumes containing condensed tannins on lungworm (dictyocaulus sp.) and gastrointestinal parasitism in young red deer (cervus elaphus). | to investigate the effect of feeding forage legumes containing condensed tannins (ct) on internal parasitism, red deer calves were fed either lucerne (medicago sativa; 0.1 per cent ct), birdsfoot trefoil (lotus corniculatus; 1.9 per cent ct) or sulla (hedysarum coronarium; 3.5 per cent ct) and trickle-infected with deer-origin gastrointestinal nematode and lungworm (dictyocaulus sp.) larvae for 5 weeks, then slaughtered at 7 weeks. there was a significant negative linear relationship between die ... | 2000 | 10877967 |
| effect of crop rotation and soil cover on alteration of the soil microflora generated by the culture of transgenic plants producing opines. | the culture of transgenic lotus corniculatus plants producing opines, which are bacterial growth substrates, leads to the selection of rhizospheric bacteria able to utilize these substrates. we have investigated the fate of the opine-utilizing community over time under different experimental conditions following elimination of selective pressure exerted by the transgenic plants. these plants were removed from the soil, which was either left unplanted or replanted with wild-type l. corniculatus o ... | 2000 | 10886651 |
| effect of condensed tannins extracted from four forages on the viability of the larvae of deer lungworms and gastrointestinal nematodes. | the inhibitory activity of condensed tannins extracted from four forage legume plants were evaluated by using a larval migration inhibition assay. the first (l1) and third (l3) stages of deer lungworm (dictyocaulus viviparus), and the third stage (l3) of deer gastrointestinal nematodes were incubated with tannins extracted from lotus pedunculatus, lotus corniculatus, sulla (hedysarum coronarium) and sainfoin (onobrychus viciifolia). the tannins extracted from all the forages had inhibitory activ ... | 2000 | 10955893 |
| the bio operon on the acquired symbiosis island of mesorhizobium sp. strain r7a includes a novel gene involved in pimeloyl-coa synthesis. | the symbiosis island of mesorhizobium sp. strain r7a is a 500 kb chromosomal genetic element that upon transfer converts nonsymbiotic mesorhizobia to symbionts able to nodulate and fix nitrogen with lotus corniculatus. four genomic species of nonsymbiotic mesorhizobia have been isolated. all were auxotrophic for thiamin and biotin and three were auxotrophic for nicotinate, whereas derivatives of the strains containing the symbiosis island were prototrophic for all three vitamins. in this work, a ... | 2001 | 11320134 |
| the effect of condensed tannins from lotus pedunculatus and lotus corniculatus on the growth of proteolytic rumen bacteria in vitro and their possible mode of action. | five strains of proteolytic rumen bacteria were treated with condensed tannins (ct) purified from lotus pedunculatus and lotus corniculatus to investigate their effect on the growth of these bacteria in vitro. streptococcus bovis ncfb 2476, eubacterium sp. c124b, prevotella bryantii b14, butyrivibrio fibrisolvens h17c, and clostridium proteoclasticum b316t were tested against 200, 400, and 600 microg ct x ml(-1) extracted from l. pedunculatus and l. corniculatus. in the absence of ct, all bacter ... | 2001 | 11547882 |
| the root-nodule symbiosis between sarothamnus scoparius l. and its microsymbionts. | when nitrogen fixing root nodules are formed, sarothamnus scoparius (broom) is inoculated with its microsymbionts. nodules studied under light and electron microscopy exhibited typical indeterminate nodule histology with apical, persistent meristem, age gradient of nodule tissues, and open vascular bundles, and also with some particular features such as: the presence of mitotic activity in the infected meristematic cells, lack of infection threads, distribution of bacteria by process of host cel ... | 2001 | 11816984 |
| effect of condensed tannins on egg hatching and larval development of trichostrongylus colubriformis in vitro. | the effects of condensed tannins extracted from seven forages on the viability of the eggs and first stage (l1) larvae of the sheep nematode trichostrongylus colubriformis were evaluated in in vitro assays. the extracts of condensed tannins were obtained from lotus pedunculatus (lp), lotus corniculatus (lc), sulla (hedysarum coronarium), sainfoin (onobrychus viciifolia), dorycnium pentaphylum (dp), dorycnium rectum (dr) and dock (rumex obtusifolius). extracts containing 200 to 500 microg/ml redu ... | 2002 | 11837588 |
| the effect of diet fed to lambs on subsequent development of trichostrongylus colubriformis larvae in vitro and on pasture. | contrasting herbage diets were fed to lambs to evaluate their effect on subsequent development of trichostrongylus colubriformis larvae in faeces and on pasture. the diets had either no condensed tannin (ct), lucerne (medicago sativa cv. otaio), white clover (trifolium repens cv. tahora), or had moderate to high concentrations of ct, sulla (hedysarum coronarium cv. grassland aokau), lotus corniculatus (cv. grasslands goldie), l. pedunculatus (cv. grassland maku), dorycnium pentophyllum, and dory ... | 2002 | 11983303 |
| performance of steers grazing rhizomatous and nonrhizomatous birdsfoot trefoil in pure stands and in tall fescue mixtures. | this study investigated the performance of steers grazing rhizomatous birdsfoot trefoil (lotus corniculatus l.) (rbft) compared to nonrhizomatous birdsfoot trefoil (bft) in pure stands or when interseeded with endophyte-free tall fescue (festuca arundinacea schreb.; tf). five forage treatments of rbft, bft, tf, rbft+tf, and bft+tf (four replicate paddocks per treatment) were continuously stocked in spring and fall of 1998 and spring of 1999. grazing for individual treatments was terminated when ... | 2002 | 12162667 |
| lotus corniculatus condensed tannins decrease in vivo populations of proteolytic bacteria and affect nitrogen metabolism in the rumen of sheep. | condensed tannins in forage legumes improve the nutrition of sheep by reducing ruminal degradation of plant protein and increasing crude protein flow to the intestine. however, the effects of condensed tannins in forage legumes on rumen bacterial populations in vivo are poorly understood. the aim of this study was to investigate the specific effects of condensed tannins from lotus corniculatus on four proteolytic rumen bacteria in sheep during and after transition from a ryegrass (lolium perenne ... | 2002 | 12489781 |
| the effect of birdsfoot trefoil (lotus corniculatus) and chicory (cichorium intybus) on parasite intensities and performance of lambs naturally infected with helminth parasites. | conventionally, farmers rely upon the routine use of anthelmintics to control helminth parasites and their use has proved highly cost-effective. however, several factors, including the emergence of helminths resistant to pharmaceutical anthelmintics, are forcing farmers to seek alternative approaches to parasite control. studies in new zealand have shown that some alternative forages may reduce parasitic infestation in sheep. in the current study, it was found that under uk environmental conditi ... | 2003 | 12581592 |
| measuring gene flow from two birdsfoot trefoil (lotus corniculatus) field trials using transgenes as tracer markers. | genetic engineering is becoming a useful tool in the improvement of plants but concern has been expressed about the potential environmental risks of releasing genetically modified (gm) organisms into the environment. attention has focused on pollen dispersal as a major issue in the risk assessment of transgenic crop plants. in this study, pollen-mediated dispersal of transgenes via cross-fertilization was examined. plants of lotus corniculatus l. transformed with either the escherichia coli aspa ... | 2003 | 12755896 |
| effect of flavan-3-ols on in vitro egg hatching, larval development and viability of infective larvae of trichostrongylus colubriformis. | the effects of flavan-3-ols (the monomer units of condensed tannins (ct)) and their galloyl derivatives on the viability of eggs, the development of first stage (l1) larvae, and the viability of the infective larvae of trichostrongylus colubriformis were investigated under in vitro conditions. each of the flavan-3-ol gallates showed some inhibition of egg hatching at 100 microg/ml, and 100% inhibition at 1000 microg/ml, with epigallocatechin gallate being the most effective in the egg hatch (eh) ... | 2003 | 14636684 |
| the effect of dietary forage on the development and survival of helminth parasites in ovine faeces. | studies in new zealand and the uk have shown that lambs grazing birdsfoot trefoil (lotus corniculatus) or chicory (cichorium intybus) have reduced parasite intensities compared to lambs grazing ryegrass swards. however, data in the literature on the influence of forages on helminth parasites is equivocal and the underlying mechanisms by which different forage diets may affect these parasites have not been fully determined. the aim of the experiments reported here was to investigate the hypothesi ... | 2003 | 14651879 |
| symbiotic phenotypes and translocated effector proteins of the mesorhizobium loti strain r7a virb/d4 type iv secretion system. | the symbiosis island of mesorhizobium loti strain r7a contains genes with strong similarity to the structural vir genes (virb1-11; vird4) of agrobacterium tumefaciens that encode the type iv secretion system (t4ss) required for t-dna transfer to plants. in contrast, m. loti strain maff303099 lacks these genes but contains genes not present in strain r7a that encode a type iii secretion system (t3ss). here we show by hybridization analysis that most m. loti strains contain the virb/d4 t4ss and no ... | 2004 | 15469524 |
| n-hexanoyl-l-homoserine lactone, a mediator of bacterial quorum-sensing regulation, exhibits plant-dependent stability and may be inactivated by germinating lotus corniculatus seedlings. | the half-life of n-hexanoyl-l-homoserine lactone (c6-hsl) was determined under various ph and temperature conditions, and in several plant environments. c6-hsl was sensitive to alkaline ph, a process that was also temperature-dependent. in addition, c6-hsl disappeared from plant environments, i.e. axenic monocot and dicot plants cultivated under gnotobiotic, hydroponic conditions, albeit with variable kinetics. the disappearance was rapid at the root system of legume plants such as clover or lot ... | 2004 | 16329888 |
| lotus hairy roots expressing inducible arginine decarboxylase activity. | biotechnological uses of plant cell-tissue culture usually rely on constitutive transgene expression. however, such expression of transgenes may not always be desirable. in those cases, the use of an inducible promoter could be an alternative approach. to test this hypothesis, we developed two binary vectors harboring a stress-inducible promoter from arabidopsis thaliana, driving the beta-glucuronidase reporter gene and the oat arginine decarboxylase. transgenic hairy roots of lotus corniculatus ... | 2004 | 15195973 |
| characterization of condensed tannins purified from legume forages: chromophore production, protein precipitation, and inhibitory effects on cellulose digestion. | to identify simple screening tools for selecting condensed tannin (ct)-containing forages as candidate sources for further study, ct were isolated from nine legumes, and their molecular weights (mw), chromophore production, capacity to precipitate bovine serum albumin (bsa) and fraction 1 protein (rubisco) isolated from alfalfa, and inhibition of filter paper digestion were compared. sources were as follows: leaves of sericea lespedeza (lespedeza cuneata dum.-cours.), crown vetch (coronilla vari ... | 2005 | 16132212 |
| extra thin alginate film: an efficient technique for protoplast culture. | this paper reports an efficient protoplast culture technique, the "extra thin alginate film" technique. the development of this improved method of protoplast culture was an outcome of an assessment of the efficiency and shortcomings of various protoplast culture techniques. the efficiency of this technique was evaluated with two model plant systems, viz., nicotiana tabacum and lotus corniculatus, and a comparison was made with the "thin alginate layer" technique, another efficient protoplast cul ... | 2005 | 16244810 |
| a comparison of two strategies to modify the hydroxylation of condensed tannin polymers in lotus corniculatus l. | a full-length sense antirrhinum majus dihydroflavonol reductase (dfr) sequence was introduced into birdsfoot trefoil (lotus corniculatus l.) in experiments aimed at modifying condensed tannin content and polymer hydroxylation in a predictable manner. analysis of transgenic plants indicated lines that showed enhanced tannin content in leaf and stem tissues. in contrast to previous data from root cultures, levels of propelargonidin units were not markedly elevated in lines with enhanced tannin con ... | 2005 | 15896367 |
| de novo alanine synthesis by bacteroids of mesorhizobium loti is not required for nitrogen transfer in the determinate nodules of lotus corniculatus. | deletion of both alanine dehydrogenase genes (alda) in mesorhizobium loti resulted in the loss of alda enzyme activity from cultured bacteria and bacteroids but had no effect on the symbiotic performance of lotus corniculatus plants. thus, neither indeterminate pea nodules nor determinate l. corniculatus nodules export alanine as the sole nitrogen secretion product. | 2005 | 16030244 |
| toxicity of phenolic compounds extracted from bark residues of different ages. | in quebec, canada, industrial bark wastelands cover several hundred hectares of land. bark residue that has piled up for decades tends to remain free of vegetation for years. to assess the revegetation potential of such sites, we sought to determine those factors responsible for poor plant growth. phenolic compounds from fresh to 20-year-old bark residues were extracted with four solvents and quantified by high-performance liquid chromatography (hplc). we simulated solutions (mixtures of standar ... | 2006 | 17089184 |
| the effects of birdsfoot trefoil (lotus corniculatus) and chicory (cichorium intybus) when compared with perennial ryegrass (lolium perenne) on ovine gastrointestinal parasite development, survival and migration. | two experiments were conducted to investigate the effects of birdsfoot trefoil and chicory on parasitic nematode development, survival and migration when compared with perennial ryegrass. in experiment one, sheep faeces, containing 10,385 cooperia curticei eggs were added to 25 cm diameter pots containing birdsfoot trefoil, chicory or ryegrass, and the pots maintained under optimal conditions for nematode parasite development. replicate pots of each forage type were destructively sampled on day ... | 2006 | 16495015 |
| individual administration of three tanniferous forage plants to lambs artificially infected with haemonchus contortus and cooperia curticei. | we investigated direct anthelmintic effects associated with the feeding of fresh tanniferous forages against established populations of haemonchus contortus and cooperia curticei in lambs. twenty-four parasite naive lambs were inoculated with a single dose of infective larvae of these two parasites 27 days prior to the start of the feeding experiment. lambs were individually fed with either chicory (cichorium intybus), birdsfoot trefoil (lotus corniculatus), sainfoin (onobrychis viciifolia) or a ... | 2007 | 17336459 |
| no-choice preference of cerotoma trifurcata (coleoptera: chrysomelidae) to potential host plants of bean pod mottle virus (comoviridae) in iowa. | to better understand the naturally occurring host range of bean pod mottle virus (family comoviridae, genus comovirus, bpmv) and its principal vector cerotoma trifurcata (förster) (coleoptera: chrysomelidae), 18 field-collected perennial plant species were tested for the presence of bpmv. by using no-choice assays, we determined the preference of these plants by bean leaf beetle, by measuring their level of herbivory relative to soybean, glycine max (l.). new food hosts for adult bean leaf beetl ... | 2007 | 17598542 |
| palatability in sheep and in vitro nutritional value of dried and ensiled sainfoin (onobrychis viciifolia) birdsfoot trefoil (lotus corniculatus), and chicory (cichorium intybus). | three temperate forages, sainfoin, birdsfoot trefoil, and chicory, characterized by elevated contents of plant secondary compounds, were compared to a ryegrass-clover mixture (control) in dried (experiment 1) and ensiled form (experiment 2) in their palatability and nutritional value. palatability was measured in adult wethers (n = 6) allowed to choose between the familiar control forage and one of the three test plants. palatability index was calculated from differences in intake of control and ... | 2007 | 18069619 |
| ectopic expression of a basic helix-loop-helix gene transactivates parallel pathways of proanthocyanidin biosynthesis. structure, expression analysis, and genetic control of leucoanthocyanidin 4-reductase and anthocyanidin reductase genes in lotus corniculatus. | proanthocyanidins (pas) are plant secondary metabolites and are composed primarily of catechin and epicatechin units in higher plant species. due to the ability of pas to bind reversibly with plant proteins to improve digestion and reduce bloat, engineering this pathway in leaves is a major goal for forage breeders. here, we report the cloning and expression analysis of anthocyanidin reductase (anr) and leucoanthocyanidin 4-reductase (lar), two genes encoding enzymes committed to epicatechin and ... | 2007 | 17098849 |
| biomass allocation is an important determinant of the tannin concentration in growing plants. | condensed tannins (cts) in the diet affect consumers in a concentration-dependent manner. because of their importance in plant defence against herbivores and pathogens as well as their potential application against gastrointestinal parasites of ruminants in agronomy, an understanding of the seasonal dynamics of ct concentrations during plant growth is essential. | 2007 | 17210606 |
| identification and subcellular localization of the soybean copper p1b-atpase gmhma8 transporter. | we have identified a copper p(1b)-atpase transporter in soybean (glycine max), named as gmhma8, homologue to cyanobacterial pacs and arabidopsis thaliana athma8 (paa2) transporters. a novel specific polyclonal anti-gmhma8 antibody raised against a synthetic peptide reacted with a protein of an apparent mass of around 180-200 kda in chloroplast and thylakoid membrane preparations isolated from soybean cell suspensions. immunoblot analysis with this antibody also showed a band with similar apparen ... | 2007 | 17169574 |
| mesorhizobium gobiense sp. nov. and mesorhizobium tarimense sp. nov., isolated from wild legumes growing in desert soils of xinjiang, china. | twenty-four mesorhizobium strains were isolated from desert soils in the xinjiang region of china and were characterized by a polyphasic approach. these strains grouped into three clusters in igs-rflp, sds-page analysis of whole-cell proteins and box-pcr analysis, corresponding to genomic species v, vi and vii as found in a previous study. the results were supported by sequencing analyses of rrs, igs, atpd and reca genes. genospecies vii was most related to mesorhizobium septentrionale, while ge ... | 2008 | 18984702 |
| two glutamine synthetase genes from phaseolus vulgaris l. display contrasting developmental and spatial patterns of expression in transgenic lotus corniculatus plants. | the gln-gamma gene, which specifies the gamma subunit of glutamine synthetase in phaseolus vulgaris l., has been isolated and the regulatory properties of its promoter region analyzed in transgenic lotus corniculatus plants. a 2-kilobase fragment from the 5'-flanking region of gln-gamma conferred a strongly nodule-enhanced pattern of expression on the beta-glucuronidase reporter gene. parallel studies on the promoter of another glutamine synthetase gene (gln-beta) showed that a 1.7-kilobase frag ... | 2008 | 2577727 |
| a high-throughput method for the quantification of proanthocyanidins in forage crops and its application in assessing variation in condensed tannin content in breeding programmes for lotus corniculatus and lotus uliginosus. | lotus corniculatus and lotus uliginosus are agronomically important forage crops used in ruminant livestock production. the condensed tannin (ct) content, dry matter (dm) production, and persistence of these species are key characteristics of interest for future exploitation of these crops. here we present field data on 19 varieties of l. corniculatus, 2 varieties of l. uliginosus and, additionally, a glasshouse experiment using 6 varieties of l. corniculatus and 2 varieties of l. uliginosus. cu ... | 2008 | 18193833 |
| alteration of o-specific polysaccharide structure of symbiotically defective mesorhizobium loti mutant 2213.1 derived from strain nzp2213. | mesorhizobium loti mutant 2213.1 derived from the wild-type strain nzp2213 by tn5 mutagenesis showed impaired effectiveness of symbiosis with the host plant lotus corniculatus (turska-szewczuk et al., 2007 microbiol res, in press). the inability of lipopolysaccharide (lps) isolated from the mutant 2213.1 strain or de-o-acetylated lps of the parental cells to inactivate phage a1 particles implicated alterations in the lps structure. the o-specific polysaccharide of the mutant was studied by chemi ... | 2008 | 18217107 |
| forage systems for cow-calf production in the appalachian region. | small cow-calf operations are common in the appalachian region. tall fescue [lolium arundinaceum (schreb.) s. j. darbyshire] is the dominant forage in these systems for direct grazing as well as for stockpiling. the present study was conducted from 2001 to 2005. a total of 108 angus and angus crossbred cows were allotted randomly to 6 forage systems and then to 3 replicates within each system. in brief, system 1 had a stocking rate of 0.91 ha/cow in a middleburg 3-paddock (a, b, and c) system. s ... | 2008 | 18407993 |
| transgenic superroots of lotus corniculatus can be regenerated from superroot-derived leaves following agrobacterium-mediated transformation. | super-growing roots (superroots; sr), which have been established in the legume species lotus corniculatus, are a fast-growing root culture that allows continuous root cloning, direct somatic embryogenesis and mass regeneration of plants under entirely growth regulator-free culture conditions. these features are unique for non-hairy root cultures, and they are now stably expressed since the culture was isolated more than 10 years ago (1997). attempts to achieve direct and stable transformation o ... | 2008 | 18471930 |
| short-term nutritional treatments grazing legumes or feeding concentrates increase prolificacy in corriedale ewes. | we tested whether short periods of increased nutrition will improve ovulation rate and prolificacy, irrespective of the method used to synchronise the cycles of the ewes. in experiment 1, we used 138 corriedale ewes to evaluate two factors: synchronization treatment (sponges versus a single injection of prostaglandin) and type of pasture (native versus improved with lotus corniculatus). ewes were mated at the end of the grazing period and prolificacy was evaluated at lambing. grazing lotus corni ... | 2009 | 18639397 |