| izozymes of malate dehydrogenase in urediospores of puccinia recondita rob. ex desm. | | 1966 | 5945184 |
| [amides of amino acids and peptides as antifungal agents]. | the synthesis of pyrazolyl-amides of aminoacids and peptides is described. the chemicals were tested for antifungal activity against wheat powdery mildew (erysiphe graminis dc.), cucumber powdery mildew (erysiphe cichoracearum dc.), wheat brown rust (puccinia recondita rob. ex desm. f. sp. tritici erikss et henn.), celery leaf spot (septoria apii briosi ed cav. chest.) and collar rot (rhizoctonia solani kuhn). some of these compounds showed antifungal activity. | 1982 | 7128803 |
| [derivatives of 4-nitroso-aminopyrazole as antifungal agents]. | the synthesis of 4-nitroso-5-amminopyrazoles and of 4-nitroso-5-pyrazolylurethans and -ureas is described. the chemicals were tested for antifungal activity against erysiphe graminis, erysiphe cichoracearum, puccinia recondita, septoria apii and rhizoctonia solani. a number of the described compounds showed some antifungal activity. | 1981 | 7319023 |
| molecular mapping of wheat: major genes and rearrangements in homoeologous groups 4, 5, and 7. | a molecular-marker linkage map of hexaploid wheat (triticum aestivum l. em. thell) provides a framework for integration with teh classical genetic map and a record of the chromosomal rearrangements involved in the evolution of this crop species. we have constructed restriction fragment length polymorphism (rflp) maps of the a-, b-, and d-genome chromosomes of homoeologous groups 4, 5, and 7 of wheat using 114 f7 lines from a synthetic x cultivated wheat cross and clones from 10 dna libraries. ch ... | 1995 | 8647405 |
| subcellular localization of beta-1,3-glucanase in puccinia recondita f.sp. tritici-infected wheat leaves. | an antiserum raised against the purified 33-kda beta-1,3-glucanase of wheat (triticum aestivum l.) was employed to investigate the ultrastructural localization of the enzyme in wheat leaves infected with puccinia recondita rob. ex desm. f.sp. tritici eriks. and henn. using a post-embedding immunogold labelling technique. in both compatible and incompatible interactions, beta-1,3-glucanase was detected in the host plasmalemma and in the domain of the host cell wall near the plasmalemma of the mes ... | 1998 | 9530876 |
| induction of resistance of wheat plants to pathogens by pretreatment with n-methylated substances. | it has been established that the application of n-methylated compounds as n, n-dimethyl-l-tyrosine and glycine-betaine can induce resistance to biotrophic fungi (erysiphe graminis, puccinia recondita) in wheat (yubileynaya) at two different pretreatment concentrations. this dose-dependent "double immune response" of plants is the basic phenomenon of the biochemical immunization. these n-methylated compounds are potential formaldehyde generators and the formaldehyde formed can take part in the in ... | 1998 | 10526970 |
| effect of 1-methylascorbigen on the resistance potential of plants to pathogens. | we have studied the effect of 1'-methylascorbigen, an immunostimulating substance in animal systems on the resistance potential of barley, bean and wheat plants to the fungal pathogens erysiphe graminis, uromyces phaseoli and puccinia recondita, respectively. the effectiveness of protection depends - as in the case of other endogenous, n-methylated compounds - on the dosage of applied 1'-methylascorbigen and on the time interval between the chemical pretreatment and inoculation. the time- and do ... | 1998 | 10526989 |
| synthesis and antifungal activities of n-aryl-4-phenyl-3-(4-phenoxyphenyl)butanamides. | various n-aryl-4-phenyl-3-(4-phenoxyphenyl)butanamides (2 and 3) were tested for fungicidal activities against pyricularia oryzae, rhizoctonia solani, botrytis cinerea, phytophthora infestans, puccinia recondita, and erysiphe graminis in vivo. butanamides (2 and 3a) that have an electron withdrawing group (cl, f) attached to the meta position of the phenyl ring showed good to excellent activities against pyricularia oryzae, puccinia recondita, and erysiphe graminis in high concentration while th ... | 1999 | 10575364 |
| heterologous expression of genes mediating enhanced fungal resistance in transgenic wheat. | three cdnas encoding the antifungal protein ag-afp from the fungus aspergillus giganteus, a barley class ii chitinase and a barley type i rip, all regulated by the constitutive ubiquitin1 promoter from maize, were expressed in transgenic wheat. in 17 wheat lines, stable integration and inheritance of one of the three transgenes has been demonstrated over four generations. the formation of powdery mildew (erysiphe graminis f. sp. tritici) or leaf rust (puccinia recondita f. sp. tritici) colonies ... | 2001 | 11437256 |
| protection of wheat against leaf and stem rust and powdery mildew diseases by inhibition of polyamine metabolism. | in higher plants, polyamines arise from arginine by one of two pathways: via ornithine and ornithine decarboxylase or via agmatine and arginine decarboxylase but in fungi, only the ornithine decarboxylase pathway is present. since polyamines are required for normal growth of microorganisms and plants and since the ornithine pathway can be irreversibly blocked by alpha-difluoromethylornithine (dfmo) which has no effect on arginine decarboxylase, fungal infection of green plants might be control ... | 1987 | 11539103 |
| novel fungitoxicity assays for inhibition of germination-associated adhesion of botrytis cinerea and puccinia recondita spores. | botrytis cinerea and puccinia recondita spores adhere strongly to polystyrene microtiter plates coincident with germination. we developed assays for inhibition of spore adhesion in 96-well microtiter plates by using sulforhodamine b staining to quantify the adherent spores. in both organisms, fungicides that inhibited germination strongly inhibited spore adhesion, with 50% effective concentrations (ec(50)s) comparable to those for inhibition of germination. in contrast, fungicides that acted aft ... | 2002 | 11823196 |
| synthesis, fungicidal activity, and qsar of pyridazinonethiadiazoles. | a series of novel 5-[1-aryl-1,4-dihydro-6-methylpyridazin-4-one-3-yl]-2-arylamino-1,3,4-thiadiazoles, related to the fungicidal activity, were synthesized and tested in vivo against wheat leaf rust, puccinia recondita. the preliminary bioassay indicated that they exhibited fungicidal activity and the activity was influenced by the nature of the substituents. a quantitative structure-activity relationship study showed that the hydrophobicity (sigma(pi)) is a major positive parameter in affecting ... | 2002 | 11879019 |
| urate oxidase from the rust puccinia recondita is a heterotetramer with two different-sized monomers. | uricase (urate: oxygen oxidoreductase; ec 1.7.3.3) from the rust puccinia recondita was purified to electrophoretic homogeneity. preparations with a specific activity of 8.4 u/mg were used for characterization of the enzyme, which showed a strong similarity to other plant and fungal urate oxidases. the enzyme had a ph optimum of 9.0, a k(m) of 35 microm for urate, and it was inhibited only by oxonate and xanthine. a molecular mass of 152 kda was estimated for the native protein. sds-page analysi ... | 2002 | 11910495 |
| synthesis, fungicidal activity, and 3d-qsar of pyridazinone-substituted 1,3,4-oxadiazoles and 1,3,4-thiadiazoles. | a series of novel 5-[1-aryl-1,4-dihydro-6-methylpyridazin-4-one-3-yl] -2-arylamino-1,3,4-oxadiazoles, fungicidally active, were synthesized based on bioisosterism and tested in vivo against wheat leaf rust, puccinia recondita. these compounds were shown to be fungicidally active, and their activity was influenced by the nature of the substituents. by using the three-dimensional quantitative structure-activity relationships (3d-qsar) method of comparative molecular field analysis (comfa), we have ... | 2002 | 12059155 |
| [the problem of durable resistance of plants to different pests]. | different hypotheses concerning durable plant resistance against different pest were tested: 1) resistance is weak and polygenetically controlled; 2) resistance depends on "residual effect" of oligogenes that were overcome by pests. contrast pair of plants and pests were used in experiments: wheat, barley--facultative parasite bipolaris sorokiniana shoem., wheat--obligate parasite puccinia recondita rob. ex desm., sorghum--greenbug schizaphis graminum rond. differential interaction between paras ... | 2002 | 12070944 |
| resistance genes in wild accessions of triticeae--inoculation test and sts marker analyses. | sequence tagged site (sts) markers have been developed recently to identify resistance genes in wheat. a number of wild relatives have been used to transfer resistance genes into wheat cultivars. accessions of wild species of triticeae: aegilops longissima (4), ae. speltoides (6), ae. tauschii (8), ae. umbellulata (3), ae. ventricosa (3), triticum spelta (2), t. timopheevi (3), t. boeoticum (4) and t. monococcum (1), 34 in total, were examined using pcr-sts markers for resistance genes against p ... | 2002 | 12441628 |
| cloning and mapping of genes involved in wheat-leaf rust interaction through gene-expression analysis using chromosome-deleted near-isogenic wheat lines. | molecular markers on wheat chromosome 6bl were isolated using mrna differential display. two wheat isolines inoculated with puccinia recondita were analysed: sinvalocho ma line carrying the lr3 gene for leaf rust resistance on distal chromosome 6bl, and a rust-susceptible derivative of the sinvalocho ma line with a deletion at the distal end of chromosome 6bl. comparison of mrna fingerprinting profiles, obtained from control and rust-inoculated plants, let to the isolation of 34 differentially d ... | 2002 | 12582923 |
| fungicidal property of curcuma longa l. rhizome-derived curcumin against phytopathogenic fungi in a greenhouse. | fungicidal activity of curcuma longa rhizome-derived materials against botrytis cineria, erysiphe graminis, phytophthora infestans, puccinia recondita, pyricularia oryzae, and rhizoctonia solani was tested using a whole plant method in vivo. it was compared with synthetic fungicides and four commercially available compounds derived from c. longa. the response varied with the tested plant pathogen. at 1000 mg/l, the hexane extract of c. longa showed fungicidal activities against e.graminis, p. in ... | 2003 | 12617587 |
| evaluation of the ipm wheat model in the rhineland 2001. | the results of field trials at nine locations with two wheat cultivars in each case demonstrated the practicability of the action threshold-based fungicide strategy of the ipm wheat model under the intensive wheat production conditions in the rhineland. action thresholds used and dosage of fungicides applied are outlined. despite using reduced rates of fungicides the epidemic development of relevant pathogens--mainly septoria tritici and puccinia recondita--was controlled in early stages of dise ... | 2002 | 12701422 |
| leaf-rust resistance in rye (secale cereale l.). 1. genetic analysis and mapping of resistance genes pr1 and pr2. | genetic analysis of resistance to leaf rust in rye (puccinia recondita f. sp. secalis) led to the identification of two dominant resistance genes, pr1 and pr2. both genes proved to be effective against a local leaf-rust population as well as a subset of single-pustule isolates (spis) the latter of which comprised spis with very high virulence complexity. resistance conferred by pr1 and pr2 was expressed in detached-leaf tests of seedlings as well as in field tests of adult plants. molecular mark ... | 2003 | 12721636 |
| leaf rust resistance genes of wheat: identification in cultivars and resistance sources. | thirty-seven wheat cultivars originating from seven european countries were examined by using sequence tagged site (sts) markers for seven lr (leaf rust = brown rust) resistance genes against the fungal pathogen of wheat puccinia recondita f. sp. tritici (lr9, lr10, lr19, lr24, lr26 and lr37). additionally, 22 accessions with various lr genes from two germplasm collections were tested. a scar (sequence-characterized amplified region) marker for lr24 and a caps (cleaved amplified polymorphic sequ ... | 2003 | 12773791 |
| some endophytic fungi reduce the density of pustules of puccinia recondita f. sp. tritici in wheat. | the interaction between puccinia recondita f. sp. tritici (now widely referred to as p. triticina) and endophytic fungi in wheat was examined in laboratory experiments to determine whether the presence of fungal endophytes suppresses leaf rust disease caused by this fungus. endophytes and cell-free washings from culture plates of the endophytes reduced the density and size of pustules in a susceptible cultivar when inoculated 3, 7 and 14 d prior to the pathogen. disease at 12 d was reduced when ... | 2003 | 12825500 |
| application of sts markers for leaf rust resistance genes in near-isogenic lines of spring wheat cv. thatcher. | sequence tagged site (sts) markers for eight resistance genes against puccinia recondita f. sp. tritici were used to screen a set of near-isogenic lines of wheat cv. thatcher containing in total 40 different lr genes and their alleles. polymerase chain reaction (pcr) analysis was carried out by using sts, scar and caps primers specific for the leaf rust resistance genes lr1, lr9, lr10, lr19, lr24, lr28, lr37 and lr47. the sts, caps and scar markers linked to resistance genes lr9, lr10, lr19, lr2 ... | 2003 | 12923307 |
| molecular markers for leaf rust resistance genes in wheat. | over 100 genes of resistance to rust fungi: puccinia recondita f. sp. tritici, (47 lr - leaf rust genes), p. striiformis (18 yr - yellow rust genes) and p. graminis f. sp. tritici (41 sr - stripe rust genes) have been identified in wheat (triticum aestivum l.) and its wild relatives according to recent papers. sixteen lr resistance genes have been mapped using restriction fragments length polymorphism (rflp) markers on wheat chromosomes. more than ten lr genes can be identified in breeding mater ... | 2001 | 14564046 |
| [histological observation on programmed cell death in wheat--leaf rust fungus intreactioin]. | the ultrastructural features of mesophyll cell surrounding the fungus in different interaction between wheat and puccinia recondita f. sp tritici were observed with transmission electron microscopy. in incompatible combination(cv. lorvin 10 x race 162), the nuclei gradually became irregular with highly condensed chromatin towards the nuclear envelope, while the chloroplast became swelling since 12 h to 24 h after inoculation(a.i.). at 48 h a.i., the condensation of the chromatin became more prom ... | 2003 | 14724947 |
| genetics of resistance to wheat leaf rust. | leaf rust (caused by puccinia recondita f. sp. tritici) is the most widespread and regularly occurring rust on wheat. genetic resistance is the most economical method of reducing yield losses due to leaf rust. to date, 46 leaf rust resistance genes have been designated and mapped in wheat. resistance gene expression is dependent on the genetics of host-parasite interaction, temperature conditions, plant developmental stage, and interaction between resistance genes with suppressors or other resis ... | 1996 | 15012551 |
| secondary effects of air pollution: ozone decreases brown rust disease potential in wheat. | young wheat plants were fumigated with 170 microg m(-3) ozone for 3 days, or with 210 microg m(-3) ozone for 7 days, for 7 hours a day. at the end of the fumigation period the plants were inoculated with brown rust (puccinia recondita f. sp. tritici) uredospores. the development of new uredospore pustules on fumigated and control plants was evaluated as a measure of rust disease potential. the number of pustules on the ozone fumigated plants was greatly reduced in comparison with the number of p ... | 1987 | 15092797 |
| interactive effects of elevated ozone and carbon dioxide on growth and yield of leaf rust-infected versus non-infected wheat. | spring wheat (triticum aestivum l. cv. turbo) was grown from seedling emergence to maturity (129 days) in chambers simulating the physical climate and ozone pollution of a field site in northern germany from 1 april to 31 july with a mean 1-h daily maximum of 61.5-62.4 nl l(-1) ozone compared to a constant low level of 21.5-22.8 nl l(-1) ozone. the two ozone levels were combined with either a current (374.1-380.2 microl l(-1)) or enriched (610.6-615.0 microl l(-1)) co(2) atmosphere. additionally ... | 2000 | 15092930 |
| fungal diseases on winter wheat in transdanubian region. | dominancy proportions of some wheat-pathogenic fungi were investigated by the authors in hungary, near to the lake balaton, in the years 2001-2002. in small plot trials, each 10 species of fungi from two breeding institutes were surveyed. in the year 2001, the dominant pathogen was puccinia recondita f. sp. tritici. during the breeding season the infectedness increased gradually and reached up to 28.50% by middle of may. the infectedness of some species came near to 50-90% by this time. in the y ... | 2003 | 15151302 |
| controlled release of tebuconazole from a polymer matrix microparticle: release kinetics and length of efficacy. | preparation and characterization of microencapsulated tebuconazole, its release kinetics in water, and the bioefficacy of these formulations in controlling wheat rust in spring wheat is described herein. controlled-release (cr) formulations based on matrix microparticles were prepared by the oil-in-water emulsion process. polymer-based matrix was prepared from poly(methyl methacrylate) (pmma) and poly(styrene-co-maleic anhydride) (psma). modification of the matrix was achieved by the use of diff ... | 2004 | 15264920 |
| screening extracts of achyranthes japonica and rumex crispus for activity against various plant pathogenic fungi and control of powdery mildew. | methanol extracts of fresh materials of 183 plants were screened for in vivo antifungal activity against magnaporthe grisea, corticium sasaki, botrytis cinerea, phytophthora infestans, puccinia recondita and erysiphe graminis f sp hordei. among them, 33 plant extracts showed disease-control efficacy of more than 90% against at least one of six plant diseases. the methanol extracts of achyranthes japonica (whole plant) and rumex crispus (roots) at concentrations greater than 11 g fresh weight of ... | 2004 | 15307672 |
| leaf-rust resistance in rye (secale cereale l.). 2. genetic analysis and mapping of resistance genes pr3, pr4, and pr5. | three dominant resistance genes, pr3, pr4, and pr5, were identified by genetic analysis of resistance to leaf rust in rye (puccinia recondita f. sp. secalis). each of the three genes confers resistance to a broad scale of single-pustule isolates (spis), but differences could be observed for specific pr gene/spi combinations. resistance conferred by the three genes was effective in both detached-leaf tests carried out on seedlings and in field tests of adult plants. molecular marker analysis mapp ... | 2004 | 15378246 |
| anthraquinones isolated from cassia tora (leguminosae) seed show an antifungal property against phytopathogenic fungi. | the fungicidal activities of cassia tora extracts and their active principles were determined against botrytis cineria, erysiphe graminis, phytophthora infestans, puccinia recondita, pyricularia grisea, and rhizoctonia solani using a whole plant method in vivo and were compared with synthetic fungicides and three commercially available anthraquinones. the responses varied with the plant pathogen tested. at 1 g/l, the chloroform fraction of c. tora showed a strong fungicidal activity against b. c ... | 2004 | 15453672 |
| [histological observation on programmed cell death in wheat-leaf rust fungus intreaction]. | the biochemical character of pcd in different interaction between wheat and puccinia recondita f. sp tritici was observed using dna agarose gel electrophoresis and end labeling in situ (terminal deoxynucleotidyl transferase-mediated dutp nick end tunel). the dna ladder, which is the typical character of programmed cell death(pcd), was observed in incompatible combination (cv.lorvin10 x race 162) and the positive reaction in wheat leaves of incompatible combination since 12h after inoculation als ... | 2004 | 15511077 |
| marker-assisted selection for leaf rust resistance genes lr19 and lr24 in wheat (triticum aestivum l.). | leaf rust caused by puccinia recondita f.sp. tritici is a wheat disease of worldwide importance. wheat genotypes known to carry specific rust resistance genes and segregating lines that originated from various cross combinations and derived from distinct f2 lineage, so as to represent a diverse genetic background, were included in the present study for validation of molecular markers for lr19 and lr24. sts markers detected the presence of the leaf rust resistance gene lr19 in a thatcher nil (tc* ... | 2004 | 15586436 |
| alterations in some oxidative parameters in susceptible and resistant wheat plants infected with puccinia recondita f.sp. tritici. | we studied the systemic effects after infection of susceptible and resistant (expressing hsr) wheat plants with leaf rust (puccinia recondita f.sp. tritici) on the amount of hydrogen peroxide and activity of some ros scavenging enzymes. measurements were performed 7 and 21 days after inoculation. in susceptible cultivar (sadovo 1), an inhibition of activity of catatase and gst was found. by contrast, in resistant cultivar (kristal), the infection caused an activation of these enzymes. moreover, ... | 2005 | 15832679 |
| [identification of an alien chromosome in the common wheat line multi 6r]. | the chromosome of agropyron intermedium (host) beauv. substituting chromosome 6d has been identified in the karyotype of the triticum aestivum l. line multi 6r with the use of c-banding. the alien chromosome, temporarily designated 6ag1, contains gene(s) of the resistance to the saratov population of puccinia recondita rob. ex. desm. f. tritici. it has been demonstrated that the resistance gene(s) is(are) highly efficient and that chromosome 6ag1 is preferably transferred through gametes. | 2005 | 16161629 |
| expression of transgenic stilbene synthases in wheat causes the accumulation of unknown stilbene derivatives with antifungal activity. | the expression of foreign phytoalexins in a new host is thought to increase fungal resistance, since host-specific pathogens have not experienced selection for detoxifying or metabolising the novel antifungal compounds. two resveratrol synthase genes vst1 and vst2 from grapevine (vitis vinifera l.) and the pinosylvin synthase gene pss from pine (pinus sylvestris l.) were stably transformed into bread wheat. the expression of the target genes is regulated by stress-inducible grapevine promoters. ... | 2005 | 16173460 |
| antifungal activity against plant pathogenic fungi of chaetoviridins isolated from chaetomium globosum. | the chaetomium globosum strain f0142, which was isolated from barnyard grass, showed potent disease control efficacy against rice blast (magnaporthe grisea) and wheat leaf rust (puccinia recondita). two antifungal substances were purified from broth from this organism and identified as chaetoviridins a and b. chaetoviridin a exhibited higher antifungal activity than chaetoviridin b against plant pathogenic fungi both in vitro and in vivo. treatment with chaetoviridin a at 62.5 microg/ml suppress ... | 2005 | 16209910 |
| dehydro-alpha-lapachone isolated from catalpa ovata stems: activity against plant pathogenic fungi. | the methanol extract of stems of catalpa ovata g don exhibits potent in vivo antifungal activity against magnaporthe grisea (hebert) barr (rice blast) on rice plants, botrytis cinerea pers ex fr (tomato grey mould) and phytophthora infestans (mont) de bary (tomato late blight) on tomato plants, puccinia recondita rob ex desm (wheat leaf rust) on wheat plants and blumeria graminis (dc) speer f. sp. hordei marchal (barley powdery mildew) on barley plants. an antifungal substance was isolated and i ... | 2006 | 16550502 |
| [genetic control of effective juvenile resistance to leaf rust in collection accessions of triticum aestivum l]. | of 153 accessions reported to be resistant to leaf rust (puccinia recondita rob. ex. desm.), only 70 were not affected by a pooled p. recondita population. according to phytopathological tests (inoculation with test clones), 14 accessions contained the lr19 gene; 36, the lr24 gene; 1, the lr41 gene; and 19 presumably had the lr9 gene. the presence of these resistance genes was confirmed by hybrid analysis for 26 accessions. of 28 accessions reported to carry new effective resistance genes other ... | 2006 | 16649664 |
| cytochrome b gene structure and consequences for resistance to qo inhibitor fungicides in plant pathogens. | the cytochrome b (cyt b) gene structure was characterized for different agronomically important plant pathogens, such as puccinia recondita f sp tritici (erikss) co johnston, p graminis f sp tritici erikss and hennings, p striiformis f sp tritici erikss, p coronata f sp avenae p syd & syd, p hordei gh otth, p recondita f sp secalis roberge, p sorghi schwein, p horiana henn, uromyces appendiculatus (pers) unger, phakopsora pachyrhizi syd & p syd, hemileia vastatrix berk & broome, alternaria solan ... | 2006 | 16688790 |
| fungicidal property of active component derived from acorus gramineus rhizome against phytopathogenic fungi. | the fungicidal property of acorus gramineus rhizome-derived materials against botrytis cineria, erysiphe graminis, phytophthora infestans, puccinia recondita, pyricularia grisea, and rhizoctonia solani was tested using a whole plant method in vivo, and was compared with a synthetic fungicide and seven commercially available a. gramineus rhizome-derived components. the responses varied according to the plant pathogen tested. at 2000 mg/l, the hexane fraction of a. gramineus rhizomes showed strong ... | 2007 | 16806912 |
| pathogenic fungal species isolated from leaves and seeds of smooth brome (bromus inermis leyss.). | authors made mycological investigations on smooth brome (bromus inermis leyss.) cultivar 'k51'. during the vegetation period presence and dominance of fungal species were revealed and seed infection rates were tested in two winter season. puccinia recondita, puccinia coronata, stagnospora bromi and drechslera dictyoides were dominated on the leaves, but saprotrophic fungal genera (alternaria, epicoccum, cladosporium, pithomyces) were also identified. considerable rate of seed infection were obse ... | 2006 | 17390865 |
| wheat leaf rust: control by 4-n-butyl-1,2,4-triazole, a systemic fungicide. | compound 4-n-butyl-1,2,4-triazole was demonstrated as an enduring and selective systemic fungicide for the control of wheat leaf rust by foliar and soil applications. among several species of rust fungi treated, only wheat leaf rust (puccinia recondita rob.) was controlled. wheat stem rust, for example, was unaffected by either soil or foliar applications. | 1970 | 17838176 |
| the mixed mating system of impatiens capensis and infection by a foliar rust pathogen: patterns of resistance and fitness consequences. | outcrossing by hosts may offer protection from natural enemies adapted to parental genotypes by creating diverse progeny that differ from their parents through genetic recombination. however, past experimental work addressing the relationship between mating system and disease in offspring has given conflicting results, suggesting that outcrossing might also cause the dissolution of resistant genotypes. to determine if selfed progeny are more susceptible to disease caused by the heteroecious rust ... | 2007 | 17894807 |
| characterization of a leaf rust-resistant wheat-thinopyrum ponticum partial amphiploid be-1, using sequential multicolor gish and fish. | in situ hybridization (multicolor gish and fish) was used to characterize the genomic composition of the wheat-thinopyrum ponticum partial amphiploid be-1. the amphiploid is a high-protein line having resistance to leaf rust (puccinia recondita f. sp. tritici) and powdery mildew (blumeria graminis f. sp. tritici) and has in total 56 chromosomes per cell. multicolor gish using j, a and d genomic probes showed 16 chromosomes originating from thinopyrum ponticum and 14 a genome, 14 b genome and 12 ... | 2008 | 18224300 |
| detection of quantitative trait loci associated with leaf rust resistance in bread wheat. | leaf rust, caused by puccinia recondita rob. ex desm., is a common disease in wheat. the objective of this study was to develop molecular markers associated with the quantitative trait loci (qtls) putatively conferring durable leaf rust resistance in triticum aestivum l. em. thell. a population of 77 recombinant inbred lines (rils) developed from 'parula' (resistant) and 'siete cerros' (moderately susceptible) was used. bulked segregant analysis was done using random amplified polymorphic dnas ( ... | 1997 | 18464825 |
| inheritance of leaf rust and stem rust resistance in 'roblin' wheat. | the canadian common wheat (triticum aestivum l.) cultivar 'roblin' is resistant to both leaf rust (puccinia recondita rob. ex. desm.) and stem rust (puccinia graminis pers. f. sp. tritici eriks. and e. henn.). to study the genetics of this resistance, 'roblin' was crossed with 'thatcher', a leaf rust susceptible cultivar, and rl6071, a stem rust susceptible line. a set of f6 random lines was developed from each cross. the random lines and the parents were grown in a field rust nursery artificial ... | 1993 | 18469988 |
| alloplasmic wheat - elymus ciliaris chromosome addition lines. | alloplasmic euploid wheat with the cytoplasm of elymus ciliaris (2n = 4x = 28, scscycyc) is male sterile and has reduced vigor. however, alloplasmic plants with e. ciliaris chromosomes 1sc or 1yc marked by gliadin genes gli-sc1 and gli-ycl, respectively, are vigorous and fertile. the rf genes on 1sc and 1yc are named rf-sc1 and rf-yc1. two chromosome translocations involving 1yc were isolated. the first involved the short arm of 1yc translocated to the short arm of wheat chromosome 3b. the secon ... | 1993 | 18469991 |
| the mechanism and inheritance of adult plant leaf rust resistance in 12 wheat lines. | twelve lines of wheat (triticum aestivum l.) were developed that had susceptible infection types to leaf rust (puccinia recondita rob. ex desm. f.sp. tritici) race un 15 in the seedling stage but were resistant in the adult plant stage in the field. the lines were developed from four crosses, each involving four parents (eight in total) that had originally been selected for adult plant or field resistance to stem rust (puccinia graminis pers. f.sp. tritici eriks, and henn.). the objectives of th ... | 1993 | 18470035 |
| genetic studies of leaf and stem rust resistance in six accessions of triticum turgidum var. dicoccoides. | six accessions of triticum turgidum var. dicoccoides l. (4x, aabb) of diverse origin were tested with 10 races of leaf rust (puccinia recondita f.sp. tritici rob. ex desm.) and 10 races of stem rust (p. graminis f.sp. tritici eriks. &henn.). their infection type patterns were all different from those of lines carrying the lr or sr genes on the a or b genome chromosomes with the same races. the unique reaction patterns are probably controlled by genes for leaf rust or stem rust resistance that ha ... | 1994 | 18470084 |
| transfer of leaf rust and stem rust resistance genes from triticum triaristatum to durum and bread wheats and their molecular cytogenetic localization. | six accessions of triticum triaristatum (willd) godr. &gren. (syn. aegilops triaristata) (6x, uummunun), having good resistance to both leaf rust (puccinia recondita f.sp. tritici rob. ex desm) races and stem rust (p. graminis f.sp. tritici eriks. &henn.) races, were successfully crossed with both susceptible durum wheats (t. turgidum var. durum l., 2n = 28, aabb) and bread wheats (t. aestivum, 2n = 42, aabbdd). in some crosses, embryo rescue was necessary. the t. triaristatum resistance was exp ... | 1994 | 18470085 |
| resistance to wheat leaf rust and stem rust in triticum tauschii and inheritance in hexaploid wheat of resistance transferred from t. tauschii. | twelve accessions of triticum tauschii (coss.) schmal. were genetically analyzed for resistance to leaf rust (puccinia recondita rob. ex desm.) and stem rust (puccinia graminis pers. f.sp. tritici eriks. and e. henn.) of common wheat (triticum aestivum l.). four genes conferring seedling resistance to leaf rust, one gene conferring seedling resistance to stem rust, and one gene conferring adult-plant resistance to stem rust were identified. these genes were genetically distinct from genes previo ... | 1994 | 18470124 |
| rust resistance in triticum cylindricum ces. (4x, ccdd) and its transfer into durum and hexaploid wheats. | in order to counteract the effects of the mutant genes in races of leaf rust (puccinia recondita f.sp. tritici rob. ex desm.) and stem rust (p. graminis f.sp. tritici eriks. &henn.) in wheat, exploration of new resistance genes in wheat relatives is necessary. three accessions of triticum cylindricum ces. (4x, ccdd), acy1, acy9, and acy11, were tested with 10 races each of leaf rust and stem rust. they were resistant to all races tested. viable f1 plants were produced from the crosses of the t. ... | 1995 | 18470147 |
| effect of the penicillium chrysogenum antifungal protein (paf) on barley powdery mildew and wheat leaf rust pathogens. | the small molecular mass antifungal protein of penicillium chrysogenum (paf) inhibited the growths of two obligate biotrophic fungal pathogens, blumeria graminis f. sp. hordei and puccinia recondita f.sp. tritici and, hence, mitigated the symptoms of barley powdery mildew and wheat leaf rust infections, respectively. paf also affected adversely the germination of b. graminis conidia and p. recondita uredospores causing degenerative branching of germ tubes. since powdery mildews and rusts cause s ... | 2008 | 18798177 |
| relationship among leaf (puccinia recondita roberge ex desmaz f. sp. tritici) and yellow (puccinia striiformis westendorp. f. sp. tritici) rust resistance and some agro-morphologic traits in wheat hybrids at seedling stage. | this research was carried out to determine if dominant morphological traits can be use instead of the rust resistance tests as marker characters for some agro-morphologic traits both leaf (puccinia recondita roberge ex desmaz. f. sp. tritici.) and yellow rust (puccinia striiformis westendorp f. sp. tritici) disease. for this, 13 wheat parent (4 are t. durum desf. and 9 are t. aestivum l.) were used and three main agro-morphologic traits (namely, leaf colour (lc) (dark and light green, dg and lg, ... | 2008 | 18819587 |
| comparative analysis of indices in the study of virulence diversity between and within populations of puccinia recondita f. sp. tritici in israel. | abstract isolates of puccinia recondita f. sp. tritici (n = 260) obtained from bread, durum, and wild emmer wheat leaf collections throughout israel during 1993 to 1997 were analyzed for virulence on a set of wheat differentials. the overall frequency of virulence increased on differentials possessing resistance genes lr1, lr2a, lr3, and lr26 and decreased on lr17, lr21, and lr30. genes lr9 and lr24 were resistant, while lr18 was susceptible (98% in 1996) to all tested leaf rust isolates and lr1 ... | 2000 | 18944539 |
| wheat leaf rust severity as affected by plant density and species proportion in simple communities of wheat and wild oats. | abstract while it is generally accepted that dense stands of plants exacerbate epidemics caused by foliar pathogens, there is little experimental evidence to support this view. we grew model plant communities consisting of wheat and wild oats at different densities and proportions and exposed these communities to puccinia recondita to induce wheat leaf rust. wild oats was included because it is a common competitor of wheat and may act as a barrier to the dispersal of p. recondita spores among wh ... | 1998 | 18944944 |
| selection of populations of puccinia recondita f. sp. tritici for shortened latent period on a partially resistant wheat cultivar. | abstract wild-type fungal population 851-wt was selected for shortened latent period on cv. ci 13227 for five uredinial generations to study the adaptation of puccinia recondita f. sp. tritici to partially resistant wheat cultivars. differences among wild-type and selected populations for traits contributing to parasitic fitness (i.e., latent period, infection frequency, and uredinium area and growth rate) were assessed in monocyclic infection experiments on susceptible cv. monon and partially r ... | 1997 | 18945138 |
| [the generation of h2o2 in wheat hypersensitive reaction induced by leaf rust fungus]. | h2o2 burst in the defense responses of wheat (triticum aestivum l.) infected with compatible and incompatible leaf rust fungus races (puccinia recondita f.sp. tritici) was investigated firstly. cytofluorimetric analysis using the fluorescent probe dcfhda scrutinized the generation of h2o2 in wheat primary leaves. the results indicated that h2o2 burst could be induced by either compatible or incompatible leaf rust fungus. however, the kinetics of h2o2 burst in incompatible interaction were biphas ... | 2008 | 18958998 |
| antifungal activity of che-23c, a dimeric sesquiterpene from chloranthus henryi. | an antifungal compound was isolated from methanol extracts of stems and roots of chloranthus henryi hemsl. using ethyl acetate extraction and various chromatographic techniques. on the basis of spectroscopic analyses including mass and various nmr, the structure of the compound was identified as a dimeric sesquiterpene, che-23c. the compound showed potent antifungal activities (mics = 1-32 microg/ml) in vitro against various phytopathogenic fungi such as alternaria kikuchiana , botrytis cinerea ... | 2009 | 19566082 |
| synthesis and fungicidal activity of tubulin polymerisation promoters. part 1: pyrido[2,3-b]pyrazines. | the excellent fungicidal activity of [1,2,4]triazolo[1,5-a]pyrimidines suggested the search for further analogues with improved properties. | 2010 | 19795441 |
| construction of a recombinant bacillus velezensis strain as an integrated control agent against plant diseases and insect pests. | to construct a new recombinant strain of bacillus velezensis that has antifungal and insecticidal activity via the expression of the insecticidal bacillus thuringiensis crystal protein, a b. thuringiensis expression vector (pht1k-1ac) was generated that contained the b. thuringiensis cry1ac gene under the control of its endogenous promoter in a minimal e. coli-b. thuringiensis shuttle vector (pht1k). this vector was introduced into a b. velezensis isolate that showed high antifungal activities a ... | 2009 | 19884784 |
| nematicidal and antifungal activities of annonaceous acetogenins from annona squamosa against various plant pathogens. | the methanol extract of annona squamosa seeds was highly active against two phytoparasitic nematodes, bursaphelenchus xylophilus and meloidogyne incognita. it efficiently suppressed plant diseases, caused by phytophthora infestans and puccinia recondita. ten annonaceous acetogenins (aas) were isolated, and their chemical structures were identified by mass and nuclear magnetic resonance spectral data. out of 10 substances, eight displayed strong in vitro nematicidal activity against b. xylophilus ... | 2011 | 21910504 |