Publications
| Title | Abstract | Year Filter | PMID(sorted descending) Filter |
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| transformation of copper fractions in rhizosphere soil of two dominant plants in a deserted land of copper tailings. | this paper studied the transformation of copper fractions in rhizosphere and non-rhizosphere soils of festuca arundinacea and trifolium repens in deserted land of copper tailings. the results showed that the proportion of organic-bound or exchangeable contents to the total contents of copper in rhizosphere increased by 9.81 and 10.42%, while the contents of carbonate-bound or fe-mn oxides-bound decreased by 2.96 and 1.82%, respectively. the growth and absorption of f. arundinacea and t. repens a ... | 2009 | 19169613 |
| biodiversity effects on yield and unsown species invasion in a temperate forage ecosystem. | current agricultural practices are based on growing monocultures or binary mixtures over large areas, with a resultant impoverishing effect on biodiversity at several trophic levels. the effects of increasing the biodiversity of a sward mixture on dry matter yield and unsown species invasion were studied. | 2009 | 19168861 |
| plant host effect on the development of heliothis virescens f. (lepidoptera: noctuidae). | heliothis virescens f. is an important polyphagous pest that can develop on >100 plant species, including 20 economic crops. populations of this insect are believed to be locally maintained on a few crops and weed hosts in washington county, ms. to find the intrinsic value of these plants for the development of h. virescens populations, we fed different laboratory and wild colonies with fresh and lyophilized plant tissue under a constant temperature. development time of this insect under laborat ... | 2008 | 19161698 |
| biological, serological, and molecular variabilities of clover yellow vein virus. | abstract a comparative study was made on the host reactions, serological properties, and nucleotide sequences of the coat protein (cp) gene of 10 clover yellow vein virus (c1yvv) isolates and one bean yellow mosaic virus (bymv) isolate collected from different host plant species and locations in japan. two strains of c1yvv isolates, grouped on the basis of host reactions on chenopodium amaranticolor, c. quinoa, nicotianaclevelandii, n. benthamiana, vicia faba, and trifolium repens, corresponded ... | 1997 | 18945034 |
| combining winter hardiness and forage yield in white clover (trifolium repens) cultivated in northern environments. | white clover (trifolium repens) is an important component of sustainable livestock systems around the world. its exploitation for agriculture in the northern, marginal areas is, however, currently limited by the lack of cultivars that combine persistence and high production potential. the aims are to investigate whether it is feasible to create breeding material of white clover for these areas by combining winter hardiness of northerly populations with good yielding ability of more southerly cul ... | 2008 | 18772149 |
| wet oxidation pretreatment, enzymatic hydrolysis and simultaneous saccharification and fermentation of clover-ryegrass mixtures. | the potential of clover (trifolium repens) and ryegrass (lolium perenne) mixtures as raw materials for ethanol production was investigated. wet oxidation, at 175, 185 or 195 degrees c during 10min at two different oxygen pressures and with either addition or no addition of sodium carbonate, was evaluated as pretreatment method for clover-ryegrass mixtures. the enzymatic hydrolysis of cellulose was significantly improved after pretreatment. the highest conversion efficiency, 93.6%, was achieved f ... | 2008 | 18514510 |
| 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 |
| [effects of alternaria tenuis nees on trifolium repens l. under cu stress]. | with pot culture, this paper studied the effects of alternaria tenuis nees inoculation on the eco-physiological indices of trifolium repens l. leaf under cu stress. the results showed that in the control (not inoculated with the pathogen), the contents of photosynthetic pigments (chlorophyll a, b, a + b and carotenoid) and soluble protein in t. repens leaves decreased markedly with increasing cu concentration (0-3000 mg x kg(-1)). the enhancement of cellular membrane lipids peroxidation with the ... | 2007 | 18260469 |
| influence of pasture intake on the fatty acid composition, and cholesterol, tocopherols, and tocotrienols content in meat from free-range broilers. | over the last centuries, western diets acquired a dramatic imbalance in the ratio of polyunsaturated fatty acids (pufa) to saturated fatty acids (sfa) with a concomitant reduction in the dietary proportion of n-3 pufa. pastures are a good source of n-3 fatty acids, although the effect of forage intake in the fatty acid profile of meat from free-range chicken remains to be evaluated. in addition, it is unknown if consumer interest in specialty poultry products derived from free-range or organic p ... | 2008 | 18079454 |
| pasture intake improves the performance and meat sensory attributes of free-range broilers. | free-range chickens are assumed to consume low to moderate levels of pasture, although the effects of forage intake in broiler performance and poultry meat quality remain to be established. in addition, despite cellulases and hemicellulases being widely used as feed supplements to improve the nutritive value of cereal-based diets for fast-growing broilers, the potential interest of these biocatalysts in the production of free-range chicken is yet to be established. in this study, broilers of the ... | 2008 | 18079453 |
| role of myzus persicae (hemiptera: aphididae) and its secondary hosts in plum pox virus propagation. | plum pox virus (family potyviridae, genus potyvirus, ppv) is one of the most important viral pathogens of plants in the genus prunus, particularly prunus persica l. the role of the myzus persicae (sulzer) (hemiptera: aphididae) as a vector of ppv-m, and its role in spreading ppv-m, was investigated. ppv-m-infected peach trees were used as inoculum sources, and transmission to 15 herbaceous species commonly present in and around peach orchards was evaluated. the presence of ppv-m in secondary hos ... | 2007 | 17849850 |
| host-specific regulation of symbiotic nitrogen fixation in rhizobium leguminosarum biovar trifolii. | strains of rhizobium leguminosarum bv. trifolii (rlt) able to form effective nodules on trifolium ambiguum (caucasian clover, cc) form ineffective nodules on trifolium repens (white clover, wc), whereas strains that form effective nodules on wc usually do not nodulate cc. here, we investigate the genetic basis of the host-specific nitrogen-fixation phenotype of cc rhizobia. a cosmid library of the symbiotic plasmid from the wc rhizobium strain rlt nzp514 was introduced into the cc rhizobium stra ... | 2007 | 17768261 |
| superoxide anion radical scavenging activities of herbs and pastures in northern japan determined using electron spin resonance spectrometry. | free radicals are not only destructive to the living cells but also reduce the quality of animal products through oxidation. as a result the superoxide anion radical (o2-), one of the most destructive reactive oxygen species, is a matter of concern for the animal scientists as well as feed manufacturers to ensure the quality of product to reach consumers demand. the superoxide anion radical scavenging activities (sosa) of water and meoh extracts of 2 herbs and 9 pasture samples collected from lo ... | 2007 | 17713599 |
| antagonistic interactions between plant competition and insect herbivory. | interspecific competition between plants and herbivory by specialized insects can have synergistic effects on the growth and performance of the attacked host plant. we tested the hypothesis that competition between plants may also negatively affect the performance of herbivores as well as their top-down effect on the host plant. in such a case, the combined effects of competition and herbivory may be less than expected from a simple multiplicative response. in other words, competition and herbiv ... | 2007 | 17601141 |
| trehalose biosynthesis in rhizobium leguminosarum bv. trifolii and its role in desiccation tolerance. | rhizobium leguminosarum bv. trifolii forms nitrogen-fixing root nodules on the pasture legume trifolium repens, and t. repens seed is often coated with a compatible r. leguminosarum bv. trifolii strain prior to sowing. however, significant losses in bacterial viability occur during the seed-coating process and during storage of the coated seeds, most likely due to desiccation stress. the disaccharide trehalose is known to function as an osmoprotectant, and trehalose accumulation due to de novo b ... | 2007 | 17449695 |
| genome mapping of white clover (trifolium repens l.) and comparative analysis within the trifolieae using cross-species ssr markers. | allotetraploid white clover (trifolium repens l.), a cool-season perennial legume used extensively as forage for livestock, is an important target for marker-assisted breeding. a genetic linkage map of white clover was constructed using simple sequence repeat (ssr) markers based on sequences from several trifolieae species, including white clover, red clover (t. pratense l.), medicago truncatula (gaertn.) and soybean (glycine max l.). an f(1) population consisting of 179 individuals, from a cros ... | 2007 | 17356868 |
| enemy release after introduction of disease-resistant genotypes into plant-pathogen systems. | predicting the magnitude of enemy release in host-pathogen systems after introduction of novel disease resistance genes has become a central problem in ecology. here, we develop a general quantitative framework for predicting changes in realized niche size and intrinsic population growth rate after introgression of disease resistance genes into wild host populations. we then apply this framework to a model host-pathogen system targeted by genetically modified and conventionally bred disease-resi ... | 2007 | 17299054 |
| [community structure and its dynamics of predatory arthropod in jujube orchards intercropped with different herbage species]. | by using community structural characteristic indices and principal component analysis, this paper studied the community structure and its dynamics of predatory arthropod in the jujube orchards intercropped with astrugalus complanatus, trifolium repen, lotus comiculotus, and medicago sativa. the results showed that in all test jujube orchards, spider and predatory insects were the predominant components of the predatory arthropod community, and their relative abundances were 48.3% - 52.7% and 38. ... | 2006 | 17269332 |
| validation of in silico-predicted genic snps in white clover (trifolium repens l.), an outbreeding allopolyploid species. | white clover (trifolium repens l.) is an obligate outbreeding allotetraploid forage legume. gene-associated snps provide the optimum genetic system for improvement of such crop species. an est resource obtained from multiple cdna libraries constructed from numerous genotypes of a single cultivar has been used for in silico snp discovery and validation. a total of 58 from 236 selected sequence clusters (24.5%) were fully validated as containing polymorphic snps by genotypic analysis across the pa ... | 2007 | 17216492 |
| activities and survival of endophytic bacteria in white clover (trifolium repens l.). | in this study, the genera, abundance, and activities of endophytic bacteria in field-grown white clover (trifolium repens) and the fate of introduced antibiotic-tolerant bacteria in white clover tissues were investigated. pseudomonas, pantoea, and corynebacterium were the most frequently isolated endophytic bacteria genera, whereas xanthomonas, microbacterium, and cellulomonas occurred less frequently. the average bacterial populations in stolons and roots were approximately 100,000 colony-formi ... | 2006 | 17110977 |
| effects of carbon dioxide on the searching behaviour of the root-feeding clover weevil sitona lepidus (coleoptera: curculionidae). | the respiratory emission of co2 from roots is frequently proposed as an attractant that allows soil-dwelling insects to locate host plant roots, but this role has recently become less certain. co2 is emitted from many sources other than roots, so does not necessarily indicate the presence of host plants, and because of the high density of roots in the upper soil layers, spatial gradients may not always be perceptible by soil-dwelling insects. the role of co2 in host location was investigated usi ... | 2006 | 16923203 |
| quantitative contributions of blue light and par to the photocontrol of plant morphogenesis in trifolium repens (l.). | shade-avoidance is a major adaptive response of plants, and is usually considered to be controlled by phytochromes through the perception of changes in the red:far red light ratio. however, few studies on the effects of blue light (bl) and of light intensity [photosynthetically active radiation (par)] on light-grown plants have been conducted, especially concerning changes in par at constant bl. the objective here was to quantify the photocontrol of aerial morphogenesis by bl and par. experiment ... | 2006 | 16798853 |
| effects of the arbuscular mycorrhizal fungus glomus mosseae on growth and metal uptake by four plant species in copper mine tailings. | a greenhouse experiment was conducted to evaluate the potential role of arbuscular mycorrhizal fungi (amf) in encouraging revegetation of copper (cu) mine tailings. two native plant species, coreopsis drummondii and pteris vittata, together with a turf grass, lolium perenne and a leguminous plant trifolium repens associated with and without amf glomus mosseae were grown in cu mine tailings to assess mycorrhizal effects on plant growth, mineral nutrition and metal uptake. results indicated that s ... | 2007 | 16764975 |
| ozone stress and antioxidant substances in trifolium repens and centaurea jacea leaves. | ozone-sensitive (nc-s clone) and resistant plants (nc-r clone) of trifolium repens and centaurea jacea were exposed to moderate ozone concentrations in ambient air. the aim of this study was the investigation of the relation between ozone-sensitivity and leaf concentrations of antioxidants (ascorbic acid, total phenolics and total antioxidant capacity). nc-r clone showed the highest concentrations of antioxidants with 50-70% more ascorbic acid than nc-s. nc-r had about 5 times more ascorbic acid ... | 2007 | 16753243 |
| separate and combined effects of cu and cd on seedling growth and active oxygen metabolism system of trifolium repens l. | pot-culture experiments were used to examine the individual and combined effects of cu and cd pollutants on trifolium repens l. seedlings, both on their growth and their active oxygen metabolism system, mainly superoxide dismutase (sod), catalase (cat), and peroxidase (pod) activities. the results showed that the negative action took place at low concentrations of cu (less than 500 ppm) and cd (less than 0.5 ppm), which had no obvious effects on the seedlings' growth. however, as the concentrati ... | 2006 | 16720357 |
| effect of rhizobial strain and host plant on nitrogen isotopic fractionation in legumes. | lotus pedunculatus l., medicago sativa l., macroptilium atropurpureum, glycine max, and trifolium repens l. were grown in a n-free medium and inoculated with one of ten rhizobium strains. dry matter, n content, and delta(15)n values were determined for various plant parts.nodules, with the exception of those from lucerne, were enriched in (15)n relative to atmospheric n. considerable variation was found in delta(15)n values of plant herbage (-4.5 to +0.8). the extent of isotopic discrimination w ... | 1983 | 16663110 |
| dna content of free living rhizobia and bacteroids of various rhizobium-legume associations. | the dna content of bacteroids from 22 different rhizobium-legume associations was compared to that of the corresponding free living rhizobium species using laser flow microfluorometry. in all 18 effective associations, the bacteroids had either similar or higher dna content than the free living rhizobia. bacteroid populations isolated from effective clover (trifolium repens) and alfalfa (medicago sativa) nodules had an average dna content of >1.5-fold higher than free living r. trifolii and r. m ... | 1979 | 16660736 |
| involvement of the oxidative burst in phytoalexin accumulation and the hypersensitive reaction. | the role of the oxidative burst, transient production of activated oxygen species such as h(2)o(2) and superoxide (o(2) (-)) in elicitation of phytoalexins and the hypersensitive reaction (hr) was investigated in white clover (trifolium repens l.) and tobacco (nicotiana tabacum l.). h(2)o(2) and o(2) (-) production was measured as chemiluminescence (cl) mediated by luminol, which was added to suspension-cultured white clover just before measurement in an out-of-coincidence mode scintillation cou ... | 1992 | 16653104 |
| population dynamics of banded thrips (aeolothrips intermedius bagnall, thysanoptera, aeolothripidae) and its potential prey thysanoptera species on white clover. | in 2002, the occurrence of banded thrips (aeolothrips intermedius bagnall) and some other thysanoptera species on white clover (trifolium repens l.) was monitored at two locations in the continental part of slovenia. white clover presents in many countries important intercrop in integrated vegetable production. light blue sticky boards were placed on grasslands (one parcel on each location) with high percentage of white clover. sticky boards were changed in about 10-days intervals from the end o ... | 2005 | 16628913 |
| c(4)-dicarboxylate transport mutants of rhizobium trifolii form ineffective nodules on trifolium repens. | mutants of rhizobium trifolii strain 7012 defective in c(4)-dicarboxylate transport were isolated by using a selective procedure based on ph indicator media. the mutant strains cr7098 and cr7099 failed to grow on or transport succinate, fumarate, or malate, but grew at wild-type rates on several other carbon sources. the c(4)-dicarboxylate transport system was inducible in strain 7012, but was expressed constitutively in four out of five succinate-positive revertants of strain cr7098. in the fif ... | 1981 | 16593058 |
| attributes of bean yellow mosaic potyvirus transmission from clover to snap beans by four species of aphids (homoptera: aphididae). | after characterization of the natural spread of necrosis-inducing bean yellow mosaic potyvirus (family potyviridae, genus potyvirus, bymv(n)), nonpersistently transmitted from clover, trifolium repens l., to an adjacent field of snap bean, phaseolus vulgaris l., in western oregon, we established a study site enabling us to investigate the virus reservoir, to observe en masse transmission of bymv(n) to bean plants, and to identify aphid species associated with virus spread. colonies of myzus pers ... | 2005 | 16539099 |
| [allelopathic effects of invasive weed solidago canadensis on native plants]. | with growth chamber method, this paper studied the allelopathic potential of invasive weed solidago canadensis on native plant species. different concentration s. canadensis root and rhizome extracts were examined, and the test plants were trifolium repens, trifolium pretense, medicago lupulina, lolium perenne, suaeda glauca, plantago virginica, kummerowia stipulacea, festuca arundinacea, ageratum conyzoides, portulaca oleracea, and amaranthus spinosus. the results showed that the allelopathic i ... | 2005 | 16515192 |
| cyanobacterial chemotaxis to extracts of host and nonhost plants. | chemotaxis may be important when forming cyanobacterial symbioses. however, knowledge of cyanobacterial attraction towards plants and factors affecting chemotaxis is limited. chemo-attraction was observed in nostoc strains 8964:3 and pcc 73102 towards exudate or crushed extract of the natural hosts gunnera manicata, cycas revoluta and blasia pusilla, and the nonhost plants trifolium repens, arabidopsis thaliana and oryza sativa. as all tested plant extracts generated chemotaxis, the possibility ... | 2006 | 16466377 |
| clovers secrete specific phenolic compounds which either stimulate or repress nod gene expression in rhizobium trifolii. | rhizobium trifolii mutants containing escherichia coli lac gene fusions to specific nodulation (nod) genes were used to characterise phenolic compounds secreted from the roots of white clover (trifolium repens) plants. these compounds either had stimulatory or inhibitory effects upon the induction of the nod genes. the stimulatory compounds were hydroxylated flavones and the most active compound was 7,4'-dihydroxyflavone. the inhibitory compounds present in white clover root exudates were umbell ... | 1987 | 16453763 |
| biological monitoring of ozone: the twenty-year italian experience. | tropospheric ozone is a growing environmental menace in italy and in the whole mediterranean basin. the importance of active biomonitoring of this pollutant with hypersensitive bel-w3 tobacco plants is stressed, and several examples of field studies carried out in italy with this technique are presented. current limitations are discussed, with special emphasis on data quality assessment and the opportunity of adopting easy-to-use kits based on tobacco germlings instead of adult plants. a standar ... | 2006 | 16395456 |
| involvement of genes on a megaplasmid in the acid-tolerant phenotype of rhizobium leguminosarum biovar trifolii. | the acid-tolerant rhizobium leguminosarum biovar trifolii strain anu1173 exhibited several new phenotypes when cured of its symbiotic (sym) plasmid and the second largest megaplasmid. strain p22, which has lost these two plasmids, had reduced exopolysaccharide production and cell mobility on ty medium. the parent strain anu1173 was able to grow easily in laboratory media at ph 4.5, whereas the derivative strain p22 was unable to grow in media at a ph of <4.7. the intracellular ph of strain anu11 ... | 1993 | 16348908 |
| isolation and identification of vesicular-arbuscular mycorrhiza-stimulatory compounds from clover (trifolium repens) roots. | two isoflavonoids isolated from clover roots grown under phosphate stress were characterized as formononetin (7-hydroxy,4'-methoxy isoflavone) and biochanin a (5,7-dihydroxy,4'-methoxy isoflavone). at 5 ppm, these compounds stimulated hyphal growth in vitro and root colonization of an undescribed vesicular-arbuscular mycorrhiza, a glomus sp. (invam-112). the permethylated products of the two compounds were inactive. these findings suggest that the isoflavonoids studied may act as signal molecule ... | 1991 | 16348409 |
| influence of the size of indigenous rhizobial populations on establishment and symbiotic performance of introduced rhizobia on field-grown legumes. | indigenous rhizobia in soil present a competition barrier to the establishment of inoculant strains, possibly leading to inoculation failure. in this study, we used the natural diversity of rhizobial species and numbers in our fields to define, in quantitative terms, the relationship between indigenous rhizobial populations and inoculation response. eight standardized inoculation trials were conducted at five well-characterized field sites on the island of maui, hawaii. soil rhizobial population ... | 1991 | 16348393 |
| localization of bacteria and hemoglobin in root nodules of parasponia andersonii containing both bradyrhizobium strains and rhizobium leguminosarum biovar trifolii. | dual occupancy of parasponia andersonii nodules with different bradyrhizobium strains and rhizobium leguminosarum biovar trifolii was frequently obtained when two strains were inoculated into plants grown aseptically in tubes. since reisolates of bradyrhizobium strains from dually occupied nodules acquired the ability to nodulate trifolium repens, the spatial relationship of the two species of bacteria during nodule initiation and development was investigated and their proximity was demonstrated ... | 1989 | 16347995 |
| expression by soil bacteria of nodulation genes from rhizobium leguminosarum biovar trifolii. | gram-negative, rod-shaped bacteria from the soil of white clover-ryegrass pastures were screened for their ability to nodulate white clover (trifolium repens) cultivar grasslands huia and for dna homology with genomic dna from rhizobium leguminosarum biovar trifolii icmp2668 (nzp582). of these strains, 3.2% were able to hybridize with strain icmp2668 and nodulate white clover and approximately 19% hybridized but were unable to nodulate. strains which nodulated but did not hybridize with strain i ... | 1989 | 16347936 |
| reliability of the most-probable-number technique for enumerating rhizobia in tropical soils. | we used six rhizobium-legume systems to test the reliability of the most-probable-number (mpn) technique for enumerating rhizobia introduced into 14 sites representing four soil orders. the range-of-transition values (the number of dilution steps between the first not-entirely-positive and the last not-entirely-negative growth units) were compared for each species and for each soil. the probability that the observed data were significantly different from theoretical values varied with the specie ... | 1988 | 16347661 |
| ecological indicators of native rhizobia in tropical soils. | the relationship between environment and abundance of rhizobia was described by determining the populations of root nodule bacteria at 14 diverse sites on the island of maui. mean annual rainfall at the sites ranged from 320 to 1,875 mm, elevation from 37 to 1,650 m, and soil ph from 4.6 to 7.9. four different soil orders were represented in this study: inceptisols, mollisols, ultisols, and an oxisol. the rhizobial populations were determined by plant infection counts of five legumes (trifolium ... | 1988 | 16347624 |
| nodulation, nitrogen fixation, and hydrogen oxidation by pigeon pea bradyrhizobium spp. in symbiotic association with pigeon pea, cowpea, and soybean. | the pigeon pea strains of bradyrhizobium cc-1, cc-8, uasgr(s), and f4 were evaluated for nodulation, effectiveness for n(2) fixation, and h(2) oxidation with homologous and nonhomologous host plants. strain cc-1 nodulated macroptilium atropurpureum, vigna unguiculata, glycine max, and g. soja but did not nodulate pisum sativum, phaseolus vulgaris, trigonella foenum-graecum, and trifolium repens. strain f4 nodulated g. max cv. peking and pi 434937 (malayan), but the symbioses formed were poor. si ... | 1988 | 16347542 |
| influence of soil and nonsoil environments on nodulation by rhizobium trifolii. | indigenous serotypes 1-01 and 2-02 of rhizobium trifolii occupied similar percentages (18 to 23%) of root nodules on soil-grown subclover (trifolium subterraneum l.) and were virtually absent (4.5%) from nodules of soil-grown white clover (trifolium repens l.). in contrast (with the exception of one dilution [10]), serotype 1-01 occupied a substantial portion of nodules (16 to 40%) on white clover seedlings grown on mineral salts agar and exposed to samples of the same soil in the form of a 10-f ... | 1987 | 16347307 |
| association of rhizobium strains with roots of trifolium repens. | two techniques were used to assess the binding of rhizobia to clover roots: indirect counting after radiolabeling the bacteria and direct counting by using phase-contrast microscopy. microscopic observations revealed a large variability in the number of bacteria associated with individual root hairs. this variability made unbiased counting by microscopy difficult. systematic examination of all visible root hairs and "blind" counting of coded strains and treatments were adopted to minimize observ ... | 1985 | 16346819 |
| root hair deformations associated with fractionated extracts from rhizobium trifolii. | components from culture fluid and whole cells of rhizobium trifolii were examined for effects on root hair morphology of white clover seedlings (trifolium repens var. ladino). cell-free culture fluid, exopolysaccharides, supernatant fluid from the precipitation of the exopolysaccharides, capsular polysaccharides, lipopolysaccharides, and a protein fraction from culture fluids were assayed for morphogenetic effects on the root hairs of axenically grown clover seedlings. crude fractions were chrom ... | 1985 | 16346709 |
| root surface association in relation to nodulation of medicago sativa. | nine strains of rhizobium meliloti, ranging in competitive ability on medicago sativa from excellent to poor in autoclaved soils, were paired in 29 combinations and used to inoculate m. sativa in a liquid rooting medium. a positive correlation (r = 0.545) between strain ratios in nodules after 28 days and root surface cell ratios after 7 days was determined. two cell fractions from the root surface, representing loosely and firmly adhering cells, were investigated. infectivity was linked to the ... | 1982 | 16346071 |
| the effect of chicory ( cichorium intybus ) and sulla ( hedysarum coronarium ) on larval development and mucosal cell responses of growing lambs challenged with teladorsagia circumcincta. | the aim of this study was to investigate the effects of grazing different bioactive forages on acquired immunity against teladorsagia circumcinta infection. the development of immunity was assessed by following the response of trickle-infected lambs grazing chicory (cichorium intybus; ic), sulla (hedysarum coronarium; is) or grass/clover (lolium perenne/trifolium repens; igc), to a single challenge infection. parasite-naive lambs, grazing grass/clover, were also challenged with the single infect ... | 2006 | 16332288 |
| suppression of root nodule formation by artificial expression of the trenoddr1 (coat protein of white clover cryptic virus 1) gene in lotus japonicus. | trenoddr1 (trifolium repens early nodulin downregulation 1) encodes a coat protein of white clover cryptic virus 1. its expression in white clover was down-regulated at the time when root nodules formed. we surmised that its artificial expression would interfere with root nodulation. therefore, we investigated the effects of its artificial expression on the growth and root nodulation of lotus japonicus (a model legume). transformants were prepared by agrobacterium spp.-mediated transformation. t ... | 2005 | 16255246 |
| phyllobacterium trifolii sp. nov., nodulating trifolium and lupinus in spanish soils. | bacterial strain petp02(t) was isolated from nodules of trifolium pratense growing in a spanish soil. phylogenetic analysis of the 16s rrna gene sequence showed that this strain represents a member of the genus phyllobacterium. however, divergence found with the 16s rrna gene sequence of the single recognized species of this genus, phyllobacterium myrsinacearum, indicated that strain petp02(t) belongs to a different species. the results of dna-dna hybridization, phenotypic tests and fatty acid a ... | 2005 | 16166699 |
| herbaceous vegetation productivity, persistence, and metals uptake on a biosolids-amended mine soil. | the selection of plant species is critical for the successful establishment and long-term maintenance of vegetation on reclaimed surface mined soils. a study was conducted to assess the capability of 16 forage grass and legume species in monocultures and mixes to establish and thrive on a reclaimed appalachian surface mine amended with biosolids. the 0.15-ha coarse-textured, rocky, non-acid forming mined site was prepared for planting by grading to a 2% slope and amending sandstone overburden ma ... | 2012 | 16151233 |
| [effects of simulated nitrogen deposition on weeds growth and nitrogen uptake]. | in this paper, a greenhouse experiment was conducted to study the responses of different functional groups weeds to simulated nitrogen deposition (4.0 g n.m(-2).yr(-1)). native weed species poa annua, lolium perenne, avena fatua, medicago lupulina, trifolium repens, plantago virginica, veronica didyma, echinochloa crusgalli var. mitis, eleusine indica and amaranthus spinosus in orchard ecosystem were used test materials, and their above-and underground biomass and nitrogen uptake were measured. ... | 2005 | 16110678 |
| behavior, preference for, and use of alfalfa, tall fescue, white clover, and buffalograss by pregnant gilts in an outdoor production system. | sustainable outdoor pig production requires vegetation that can maintain ground cover, assimilate manure nutrients, and prevent soil erosion. two experiments were conducted to evaluate the suitability of four forages: alfalfa (medicago sativa), tall fescue (festuca arundinacea), white clover (trifolium repens), and buffalograss (buchloe dactyloides) for grazing or ground cover in pastures for pigs. each forage plot covered 7.5 m2, with nine replicates in a randomized block design. in exp. 1, eig ... | 2005 | 16100078 |
| novel forages for growth and health in farmed deer. | aims: this paper reviews recent research on the use of new forages in deer farming that may be useful for increasing growth in weaner deer for venison production, increasing the trace element status of deer, and for developing systems less reliant on chemical inputs, notably of anthelmintics used to control internal parasites. growth: grazing on pure swards of red clover (trifolium pratense) or chicory (chicorium intybus) increased weaner growth during autumn by 26-47% and during spring by 10-14 ... | 2002 | 16032280 |
| mycorrhizas improve nitrogen nutrition of trifolium repens after 8 yr of selection under elevated atmospheric co2 partial pressure. | altered environmental conditions may change populations of arbuscular mycorrhizal fungi and thereby affect mycorrhizal functioning. we investigated whether 8 yr of free-air co2 enrichment has selected fungi that differently influence the nutrition and growth of host plants. in a controlled pot experiment, two sets of seven randomly picked single spore isolates, originating from field plots of elevated (60 pa) or ambient co2 partial pressure (pco2), were inoculated on nodulated trifolium repens ( ... | 2005 | 15998404 |
| effect of forage legumes and anthelmintic treatment on the performance, nutritional status and nematode parasites of grazing lambs. | recent studies in new zealand and the uk have shown that certain forages reduce parasitic infection in sheep. the aim of this experiment was to investigate the effects of legume forages compared to ryegrass on interactions between production, nutritional status and nematodes in grazing lambs. twenty-four male lambs per forage treatment, half of which were treated with anthelmintics on day 0, grazed monocultures of lucerne (medicago sativa), red clover (trifolium pratense) and white clover (trifo ... | 2005 | 15946801 |
| [effects of alternaria azukiae on physiological metabolism and active oxygen-eliminating enzyme activities of trifolium repens]. | a pot experiment was installed to study the effects of alternaria azukiae inoculation on the cell membrane permeability, pigment and mda contents, and activities of sod, pod and cat of trifolium repens. the results showed that a. azukiae infection made t. repens leaf tissue increase its cell membrane permeability, electric conductivity, over-oxidation and mda content, but decrease its pigment content. the electric conductivity and mda content were positively related with infection time, whereas ... | 2005 | 15943371 |
| plant-specific responses to zinc contamination in a semi-field lysimeter and on hydroponics. | the species agrostis stolonifera, brassica napus and trifolium repens representing different ecological strategies, were selected to study the effect of zn contamination on zn tolerance, uptake and accumulation patterns. parallel tests were carried out with increasing concentrations of zn in a semi-field lysimeter and hydroponics in the climate chamber. a significant reduction in biomass production or root length and an increase in shoot zn concentration was observed for all species at increasin ... | 2005 | 15939514 |
| establishment and growth of experimental grass species mixtures on coal mine sites reclaimed with municipal biosolids. | the surface mining control and reclamation act of 1977 requires that coal mine sites in the united states be reclaimed to establish vegetative cover that is diverse, native, and capable of plant succession. however, there is a question as to whether vegetation established on coal mine sites reclaimed with biosolids is diverse and capable of plant succession. the influx of nutrients with the addition of biosolids leads to long-term dominance by early-successional species, most notably grasses, an ... | 2005 | 15920668 |
| [effects of grazing on architecture and small-scale pattern of grasses on artificial grassland in subtropical zone]. | this study was conducted on a 5-year artificial grassland in subtropical zone of south china. the main types of established artificial grassland there were dactylis glomerata-lolium prenne-trifolium repens and d. glomerata-t. repens pastures. four grazing intensities were designed, i.e., ck (no grazing), g1 (6 adult sheep x hm(-2)), g2 (7.5 adult sheep x hm(-2)) and g3 (10 adult sheep x hm(-2)), and all the grazing plots were rotationally grazed. the architecture and small-scale pattern of grass ... | 2004 | 15825439 |
| application of aspergillus niger-treated agrowaste residue and glomus mosseae for improving growth and nutrition of trifolium repens in a cd-contaminated soil. | the microbial transformation of sugar beet (sb) agrowaste with or without rock-phosphate (rp) has utility for the improvement of plant growth in a cd (5 microg g-1) artificially contaminated soil, particularly when the soil is co-inoculated with arbuscular mycorrhizal (am) fungus glomus mosseae isolated from a cd-polluted area. under such cd-polluted conditions, the limited growth, mineral nutrition, symbiotic developments (nodulation and am-colonization) and soil enzymatic activities were stimu ... | 2005 | 15748763 |
| the consequences of short-term grazing of bioactive forages on established adult and incoming larvae populations of teladorsagia circumcincta in lambs. | the objective of this study was to investigate the consequences of short-term grazing on bioactive forages on (i) the viability and fecundity of established adult teladorsagia circumcincta population and (ii) the establishment and development of incoming t. circumcincta infective larvae. forty-eight, parasite naive, 3-month old, grazing lambs were artificially infected with 8000 infective larvae of t. circumcincta on day 1 of the experiment. on day 21 p.i., lambs were allocated to one of three b ... | 2005 | 15722084 |
| testing for direct anthelmintic effects of bioactive forages against trichostrongylus colubriformis in grazing sheep. | the aim of the present study was to investigate potential direct anthelmintic effects of forages that contain plant secondary metabolites (psm) towards the intestinal nematode trichostrongylus colubriformis. for this purpose, we introduced an experimental design, which enabled us to investigate the direct anthelmintic effects of psm-rich forages, without significant interference of possible indirect immunological effects of psm. sixty parasite naive sheep were infected with 8000 t. colubriformis ... | 2004 | 15710524 |
| isolation and characterization of dibenzofuran-degrading comamonas sp. strains isolated from white clover roots. | three dibenzofuran (df)-degrading strains were newly isolated from roots of white clover ( trifolium repens l.) and poplar trees grown in df-contaminated soil samples. these strains, designated kd2, kd7, and pd1, were characterized as comamonas sp. on the basis of their 16s rdna sequences and physiological characteristics. the metabolites produced when strain kd7 was incubated with df were identified by gas chromatography-mass spectrometry (gc-ms) analysis. interestingly, strain kd7 was found to ... | 2004 | 15386118 |
| host plant recognition by the root feeding clover weevil, sitona lepidus (coleoptera: curculionidae). | this study investigated the ability of neonatal larvae of the root-feeding weevil, sitona lepidus gyllenhal, to locate white clover trifolium repens l. (fabaceae) roots growing in soil and to distinguish them from the roots of other species of clover and a co-occurring grass species. choice experiments used a combination of invasive techniques and the novel technique of high resolution x-ray microtomography to non-invasively track larval movement in the soil towards plant roots. burrowing distan ... | 2004 | 15385062 |
| impact of lime, nitrogen and plant species on bacterial community structure in grassland microcosms. | a microcosm-based approach was used to study impacts of plant and chemical factors on the bacterial community structure of an upland acidic grassland soil. seven perennial plant species typical of both natural, unimproved (nardus stricta, agrostis capillaris, festuca ovina and f. rubra) and fertilized, improved (holcus lanatus, lolium perenne and trifolium repens) grasslands were either left unamended or treated with lime, nitrogen, or lime plus nitrogen in a 75-day glasshouse experiment. lime a ... | 2004 | 15344932 |
| dietary preference of dairy cows grazing ryegrass and white clover. | the dietary preference of lactating dairy cows grazing perennial ryegrass (lolium perenne l.) and white clover (trifolium repens l.) was studied. twelve groups of 2 lactating, holstein-friesian dairy cows grazed 1.2-ha plots containing conterminal monocultures of clover and grass. half of the groups grazed a plot containing 75% clover and 25% grass (by ground area), with the remaining groups grazing a plot containing 25% clover and 75% grass. the intake rates of clover were higher than those of ... | 2004 | 15290979 |
| molecular cloning, functional expression in escherichia coli and enzymatic characterisation of a cysteine protease from white clover (trifolium repens). | this paper presents the cloning and biochemical characterisation of the cysteine protease tr-cp 14 from white clover (trifolium repens). the predicted amino acid sequence of tr-cp 14 is 71%, 74% and 74% identical to the cysteine proteases xcp1 and xcp2 from arabidopsis thaliana, and p48h-17 from zinnia elegans, respectively. these cysteine proteases have previously been shown to be involved in programmed cell death during tracheary element differentiation. the precursor polypeptide of tr-cp 14 w ... | 2004 | 15158718 |
| ntzip antisense plants show reduced chlorophyll levels. | we have isolated and characterized a new photosynthetic tissue-specific gene ntzip (nicotiana tabacum leucine zipper) from tobacco (n. tabacum). its deduced amino acid sequence has two highly conserved regions, leucine zipper and [ex(n)dexrh](2) motifs, which are related to the gene's biochemical functions. ntzip was expressed in leaves and stems, but was not detected in roots or flowers, suggesting that its physiological functions might be associated with photosynthesis. northern blot analysis ... | 2004 | 15120117 |
| the effect of heavy metals on dinitrogen fixation by rhizobium-white clover in a range of long-term sewage sludge amended and metal-contaminated soils. | an investigation was conducted to determine whether effective strains of rhizobium leguminosarum biovar. trifolii capable of symbiotic n2 fixation with white clover (trifolium repens) were present in a range of metal-contaminated soils. a number of historically sewage-amended sites (including experimental, pasture grassland and arable sites) were selected and compared with highly contaminated samples from abandoned heavy metal mines. many sites had metal concentrations above the limits establish ... | 1993 | 15091894 |
| determination of acaulospora longula and glomus subgroup aa in plant roots from grassland using new primers against the large subunit ribosomal dna. | molecular techniques have become increasingly important for the identification of arbuscular mycorrhizal fungi (amf). in this work acaulospora longula and glomus mosseae have been detected in plant roots from pastures using specific nucleotide primers for the two species. part of the 5' end of the large subunit of the ribosomal rna gene was amplified by nested pcr and sequenced. the distribution of the fungi within three different plant species, plantago lanceolata, trifolium repens, and holcus ... | 2004 | 15035508 |
| 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 |
| frameshift mutation events in beta-glucosidases. | compensated frameshift mutation is a modification of the reading frame of a gene that takes place by way of various molecular events. it appears to be a widespread event that is only observed when homologous amino acid and nucleodotide sequences are compared. to identify these mutation events, the sequence analysis rationale was based on the search for short regions that would have much lower degrees of conservation in protein, but not in dna, in well-conserved beta-glucosidase families. we have ... | 2003 | 14527732 |
| flavonoid-related regulation of auxin accumulation in agrobacterium tumefaciens-induced plant tumors. | agrobacterium tumefaciens-induced plant tumors accumulate considerable concentrations of free auxin. to determine possible mechanisms by which high auxin concentrations are maintained, we examined the pattern of auxin and flavonoid distribution in plant tumors. tumors were induced in transformants of trifolium repens (l.), containing the beta-glucuronidase ( gus)-fused auxin-responsive promoter ( gh3) or chalcone synthase ( chs2) genes, and in transformants of arabidopsis thaliana (l.) heynh., c ... | 2003 | 14523649 |
| inhibition of populations of haemonchus contortus in sheep fed on white clover (trifolium repens) high in lotaustralin. | 1953 | 13036873 | |
| ability of cold-tolerant plants to grow in hydrocarbon-contaminated soil. | phytoremediation of hydrocarbons in soil involves plants and their associated microorganisms. differences in environmental conditions and restrictions on species importation mean that each country may need to identify indigenous plants to use for phytoremedation. screening plants for hydrocarbon tolerance before screening for degradation ability may prove more economical than screening directly for degradation. thirty-nine cold-tolerant plants native, or exotic and naturalized, in western canada ... | 2003 | 12929494 |
| symbiotic efficiency of autochthonous arbuscular mycorrhizal fungus (g. mosseae) and brevibacillus sp. isolated from cadmium polluted soil under increasing cadmium levels. | the effect of inoculation with indigenous naturally occurring microorganisms (an arbuscular mycorrhizal (am) fungus and rhizosphere bacteria) isolated from a cd polluted soil was assayed on trifolium repens growing in soil contaminated with a range of cd. one of the bacterial isolate showed a marked pgpr effect and was identified as a brevibacillus sp. mycorrhizal colonization also enhanced trifolium growth and n, p, zn and ni content and the dually inoculated (am fungus plus brevibacillus sp.) ... | 2003 | 12927489 |
| whole-body fluxes and partitioning of amino acids to the mammary gland of cows fed fresh pasture at two levels of intake during early lactation. | the utilisation of essential amino acids (eaa) by the mammary gland of lactating dairy cows fed fresh forages was studied to provide basic information useful in designing strategies to increase the production of milk protein from pasture-fed dairy cows. the relationship between the flux of eaa in the whole body and their uptake by the mammary gland was determined in four cows in early lactation (length of time in milk 44 (sd 14.5) d) producing 21 (sd 4.0) kg milk/d. the cows were maintained in m ... | 2003 | 12908887 |
| morphological compatibility of white clover and perennial ryegrass cultivars grown under two nitrate levels in flowing solution culture. | the effects of nitrate (no3-) supply on shoot morphology, vertical distribution of shoot and root biomass and total nitrogen (n) acquisition by two perennial ryegrass (lolium perenne l.) cultivars (aberelan and preference) and two white clover (trifolium repens l.) cultivars (grasslands huia and aberherald) were studied in flowing nutrient culture. cultivars were grown from seed as monocultures and the clovers inoculated with rhizobium. the 6-week measurement period began on day 34 (grasses) and ... | 2003 | 12876188 |
| effects of earthworms and organic litter distribution on plant performance and aphid reproduction. | human management practices and large detritivores such as earthworms incorporate plant litter into the soil, thereby forming a heterogeneous soil environment from which plant roots extract nutrients. in a greenhouse experiment we investigated effects of earthworms and spatial distribution of (15)n-labelled grass litter on plants of different functional groups [ lolium perenne (grass), plantago lanceolata (forb), trifolium repens (legume)]. earthworms enhanced shoot and root growth in l. perenne ... | 2003 | 12844255 |
| a novel family in medicago truncatula consisting of more than 300 nodule-specific genes coding for small, secreted polypeptides with conserved cysteine motifs. | transcriptome analysis of medicago truncatula nodules has led to the discovery of a gene family named ncr (nodule-specific cysteine rich) with more than 300 members. the encoded polypeptides were short (60-90 amino acids), carried a conserved signal peptide, and, except for a conserved cysteine motif, displayed otherwise extensive sequence divergence. family members were found in pea (pisum sativum), broad bean (vicia faba), white clover (trifolium repens), and galega orientalis but not in other ... | 2003 | 12746522 |
| relationship between resistance and growth of trifolium repens plants and their disease history. | 17 healthy host clones and 14 clones originally diseased with the annual rust, uromyces trifolii-repentis, were sampled from the natural population of trifolium repens, which were used as the experimental plant materials. 10 rust strains of uromyces trifolii-repentis were collected for the experimental inoculation. two greenhouse and two field experiments were done, with three treatments as inoculated with one rust strain, inoculated with ten rust strains and controls, respectively. the results ... | 2003 | 12722435 |
| selection of appropriate host plants used in trap culture of arbuscular mycorrhizal fungi. | arbuscular mycorrhizal (am) fungi in coalmine spoil, island forest and saline soils were enriched in pot culture with maize (zea mays l.), tobacco (nicotiana tabacum l.), white clover (trifolium repens linn.) and silverweed cinquefoil (potentilla anserina l.). based on spores, there were more species of am fungi in the coalmine spoil (15 species, 3 genera), than in the forest soil (11 species, 4 genera) and the saline soil (5 species, 2 genera). in the trap cultures, the total of 28 species in a ... | 2003 | 12687445 |
| a preliminary rapd-pcr analysis of cimicifuga species and other botanicals used for women's health. | traditional taxonomic methods of botanical identification that rely primarily on morphological observations cannot be used efficiently when only powdered plant materials are available. thus, our objectives were to determine if we could apply a molecular approach to: a) produce unique dna profiles that are characteristic of the species, and b) determine if the geographical area or time of collection influences these dna profiles. towards this end, random amplified polymorphic dna (rapd) analyses ... | 2002 | 12587700 |
| 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 |
| [responses of agricultural crops of free-air co2 enrichment]. | over the past decade, free-air co2 enrichment (face) experiments have been conducted on several agricultural crops: wheat(triticum aestivum l.), perennial ryegrass (lolium perenne), and rice(oryza sativa l.) which are c3 grasses; sorghum (sorghum bicolor (l.) möench), a c4 grass; white clover (trifolium repens), a c3 legume; potato (solanum tuberosum l.), a c3 forb with tuber storage; and cotton (gossypium hirsutum l.) and grape (vitis vinifera l.) which are c3 woody perennials. using reports fr ... | 2002 | 12557686 |
| headspace solid-phase microextraction--comprehensive two-dimensional gas chromatography of wound induced plant volatile organic compound emissions. | plant emissions of volatile organic compounds from mechanically wounded agrostis stolonifera, pennisetum clandestinum, eucalyptus leucoxylon and trifolium repens have been sampled by headspace-solid phase microextraction (hs-spme) and analysed by using comprehensive two-dimensional gas chromatography (gcxgc) for measurement of the plant emissions. gcxgc produces a fingerprint of the volatile organic compounds in a 2d separation space that may be approximately interpreted as a boiling point-polar ... | 2002 | 12537367 |
| 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 influence of phosphorus deficiency on growth and nitrogen fixation of white clover plants. | the effects of p deficiency on growth, n(2)-fixation and photosynthesis in white clover (trifolium repens l.) plants were investigated using three contrasting relative addition rates of p, or following abrupt withdrawal of the p supply. responses to a constant below-optimum p supply rate consisted of a decline in n(2)-fixation per unit root weight and a small reduction in the efficiency with which electrons were allocated to the reduction of n(2) in nodules. abrupt removal of p arrested nodule g ... | 2002 | 12451030 |
| biomarkers of exposure to cyanogens in horses with grass sickness. | to test the hypothesis that equine grass sickness may be associated with the ingestion of cyanogenic glycosides from white clover (trifolium repens), the concentrations of whole blood cyanide, and plasma and urinary thiocyanate, the main metabolite of cyanide, were measured in 12 horses with acute grass sickness and 10 horses with subacute grass sickness, and in 43 control horses, of which 21 were co-grazing with cases of acute grass sickness, 12 grazed pastures where grass sickness had not been ... | 2002 | 12408327 |
| effects of grazing undrenched weaner deer on chicory or perennial ryegrass/white clover pasture on the viability of gastrointestinal nematodes and lungworms. | this study determined the in vitro effects on the viability of internal parasites of grazing undrenched weaner deer on either chicory (cichorium intybus) or perennial ryegrass (lolium perenne)/white clover (trifolium repens) pasture. one experiment investigated the hatching and development of gastrointestinal nematode eggs and larvae, and the development and motility of l1 lungworm (dictyocaulus eckerti) larvae, and a second experiment used larval migration inhibition assays to test the viabilit ... | 2002 | 12371691 |
| sugar-binding activity of pea lectin expressed in white clover hairy roots. | introduction of the pea (pisum sativum l.) lectin (psl) gene into white clover (trifolium repens l.) hairy roots facilitates nodulation by the nitrogen-fixing bacterium rhizobium leguminosarum biovar viciae, which normally nodulates pea and not white clover (c.l. diaz, l.s. melchers, p.j.j. hooykaas, b.j.j. lugtenberg, and j.w. kijne [1989] nature 338: 579-581). here, we show that psl is functionally expressed in transgenic white clover hairy roots transformed with the psl gene. psl could be iso ... | 1995 | 12228660 |
| 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 |
| differential localization of carbohydrate epitopes in plant cell walls in the presence and absence of arbuscular mycorrhizal fungi. | two monoclonal antibodies (mcabs) generated against rhamnogalacturonan i and characterized as specific for a terminal [alpha]-(1->2)-linked fucosyl-containing epitope (ccrc-m1) and for an arabinosylated [beta]-(1,6)-galactan epitope (ccrc-m7) were used in immunogold experiments to determine the distribution of the epitopes in four plants. allium porrum, zea mays, trifolium repens, and nicotiana tabacum plants were chosen as representatives of monocots and dicots with different wall structures. a ... | 1996 | 12226286 |
| hazards of insecticides to the bumble bees bombus impatiens (hymenoptera: apidae) foraging on flowering white clover in turf. | insecticides used on turf are sometimes applied to areas with flowering weeds that attract honey bees and native pollinators. we tested residual effects of such treatments on colony vitality and behavior of the bumble bees bombus impatiens cresson foraging on turf containingwhite clover, trifolium repens l. imidacloprid, a syst emic chloronicotinyl used for preventive control of root-feeding grubs, was applied as granules, followed by irrigation, or sprayed as a wettable powder, with or without ... | 2002 | 12216812 |
| the effects of altitude, aspect, grazing and time on the proportion of cyanogenics in neighbouring populations of trifolium repens l. (white clover). | the proportion of cyanogenic individuals of white clover amongst 200 individuals in each of 32 neighbouring populations in northumberland, uk were recorded. sites differed for four altitude zones, two aspects, and were either sheep pasture or ungrazed meadow. the proportion of cyanogenics showed a striking reduction with increasing altitude. below 100 m, north-facing sites contained more cyanogenics than south-facing sites, but aspect did not affect higher sites. grassland management had no effe ... | 2002 | 12180084 |
| arbuscular mycorrhizal community composition associated with two plant species in a grassland ecosystem. | arbuscular mycorrhizal (am) fungi are biotrophic symbionts colonizing about two-thirds of land plant species and found in all ecosystems. they are of major importance in plant nutrient supply and their diversity is suggested to be an important determinant of plant community composition. the diversity of the am fungal community composition in the roots of two plant species (agrostis capillaris and trifolium repens) that co-occurred in the same grassland ecosystem was characterized using molecular ... | 2002 | 12144674 |
| a simple model of feedback regulation for nitrate uptake and n2 fixation in contrasting phenotypes of white clover. | a simple three equation model is proposed for the feedback regulation of nitrate uptake and n2 fixation, based on the concentration of the organic n substrate pool within the plant and two parameters denoting the n substrate concentrations at which half-maximal inhibition occurs. this model simulated three contrasting phenotypes of white clover (trifolium repens l.) inbred lines with (1) normal rates of nitrate uptake and n2 fixation (nnu); (2) low rates of nitrate uptake (lnu); and (3) very low ... | 2002 | 12125767 |
| phytoremediation of subarctic soil contaminated with diesel fuel. | the effects of several plant species, native to northern latitudes, and different soil amendments, on diesel fuel removal from soil were studied. plant treatments included scots pine (pinus sylvestris), poplar (populus deltoides x wettsteinii), a grass mixture (red fescue, fesuca rubra; smooth meadowgrass, poa pratensis and perennial ryegrass, lolium perenne) and a legume mixture (white clover, trifolium repens and pea, pisum sativum). soil amendments included npk fertiliser, a compost extract a ... | 2002 | 12118697 |
| the white clover enod40 gene family. expression patterns of two types of genes indicate a role in vascular function. | enod40 is one of the genes associated with legume nodule development and has a putative role in general plant organogenesis. we have isolated a small enod40 gene family from white clover (trifolium repens), with three genes designated trenod40-1, trenod40-2, and trenod40-3, all containing the conserved enod40 regions i and ii. trenod40-1 and trenod40-2 share over 90% homology in the transcribed regions and high levels of similarity in their upstream regulatory sequences. trenod40-1 and trenod40- ... | 2002 | 12114565 |