The Experts below are selected from a list of 285 Experts worldwide ranked by ideXlab platform
Hei Leung - One of the best experts on this subject based on the ideXlab platform.
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relationship between virulence variation and DNA Polymorphism in puccinia striiformis
Phytopathology, 1993Co-Authors: Xianming Chen, RF F Line, Hei LeungAbstract:One-hundred, fifteen single-urediospore isolates from 23 collections (five isolates per collection) of Puccinia striiformis f. sp. tritici (stripe rust of wheat) selected to represent different regions in North America and different virulence patterns were analyzed for variation in virulence and DNA Polymorphism. Virulence characterization was based on the expression of infection types on 15 wheat cultivars used to differentiate races of P. striiformis in North America. Of the 23 collections, 20 had uniformly different virulence patterns, i.e., each of the 20 collections was a different race, and all five isolates of each collection had the same virulence pattern. Two collections consisted of isolates with two virulence patterns, and one collection consisted of isolates with three virulence patterns [...]
Bernard Decaris - One of the best experts on this subject based on the ideXlab platform.
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Ribosomal DNA Polymorphism in the genus Bifidobacterium.
Research in Microbiology, 1996Co-Authors: Irène Mangin, Nathalie Bourget, Bernard DecarisAbstract:Ribosomal DNA Polymorphism was studied in order to demonstrate intra- and interspecies differentiation of 42 Bifidobacterium strains. DNA from these strains was digested with the endonucleases BamHI, EcoRV, HindIII and PvuII and then analysed by Southern blotting. Ribosomal patterns using a part of an rRNA 23S gene as a probe clearly differentiated the majority of species from each other. Only B. indicum ATCC 25912T and B. infantis ATCC 15697T displayed identical ribosomal patterns, even though they are classified into two different species. Moreover, ribotypes were able to distinguish between strains belonging to the same species. Furthermore, these strains generally showed common bands, except for B. infantis strains and two strains of B. animalis.
Xianming Chen - One of the best experts on this subject based on the ideXlab platform.
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relationship between virulence variation and DNA Polymorphism in puccinia striiformis
Phytopathology, 1993Co-Authors: Xianming Chen, RF F Line, Hei LeungAbstract:One-hundred, fifteen single-urediospore isolates from 23 collections (five isolates per collection) of Puccinia striiformis f. sp. tritici (stripe rust of wheat) selected to represent different regions in North America and different virulence patterns were analyzed for variation in virulence and DNA Polymorphism. Virulence characterization was based on the expression of infection types on 15 wheat cultivars used to differentiate races of P. striiformis in North America. Of the 23 collections, 20 had uniformly different virulence patterns, i.e., each of the 20 collections was a different race, and all five isolates of each collection had the same virulence pattern. Two collections consisted of isolates with two virulence patterns, and one collection consisted of isolates with three virulence patterns [...]
J. Bouvet - One of the best experts on this subject based on the ideXlab platform.
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mitochondrial DNA Polymorphism phylogeography and conservation genetics of the brown bear ursus arctos in europe
Proceedings of The Royal Society B: Biological Sciences, 1994Co-Authors: P. Taberlet, J. BouvetAbstract:Some small European populations of the brown bear (Ursus arctos) are threatened by the risk of extinction in the near future. The reinforcement of these populations with bears from other regions might provide a solution to their future survival. However, before any population transfer, the different conservation units must be identified. The phylogeographic approach has been advocated for this purpose. The different European populations were assayed for mitochondrial (mt) DNA Polymorphism. A remarkable degree of concordance was found between the geographic distribution and the mtDNA haplotypes. Two clearly distinct lineages differing by more than 7% in mtDNA control region sequences were found and, furthermore, the western lineage appears to be organized into two clades which correspond to two different ancestral refugia. The potential conservation units can be deduced from these results, and a management policy can consequently be inferred. This study clearly demonstrates the relevance of the molecular phylogeographic approach to the identification of conservation units.
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Mitochondrial-DNA Polymorphism, Phylogeography, And Conservation Genetics Of The Brown Bear Ursus-Arctos In Europe
Proceedings of the Royal Society B: Biological Sciences, 1994Co-Authors: P. Taberlet, J. BouvetAbstract:Some small European populations of the brown bear (Ursus arctos) are threatened by of extinction in the near future. The reinforcement of these populations with bears from other regions might provide a solution to their future survival. However, before any population transfer, the different conservation units must be identified. The phylogeographic approach has been advocated for this purpose. The different European populations were assayed for mitochondrial (mt) DNA Polymorphism. A remarkable degree of concordance was found between the geographic distribution and the mtDNA haplotypes. Two clearly distinct lineages differing by more than 7 % in mtDNA control region sequences were found and, furthermore, the western lineage appears to be organized into two clades which correspond to two different ancestral refugia. The potential conservation units can be deduced from these results, and a management policy can consequently be inferred. This study clearly demonstrates the relevance of the molecular phylogeographic approach to the identification of conservation units.
RF F Line - One of the best experts on this subject based on the ideXlab platform.
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relationship between virulence variation and DNA Polymorphism in puccinia striiformis
Phytopathology, 1993Co-Authors: Xianming Chen, RF F Line, Hei LeungAbstract:One-hundred, fifteen single-urediospore isolates from 23 collections (five isolates per collection) of Puccinia striiformis f. sp. tritici (stripe rust of wheat) selected to represent different regions in North America and different virulence patterns were analyzed for variation in virulence and DNA Polymorphism. Virulence characterization was based on the expression of infection types on 15 wheat cultivars used to differentiate races of P. striiformis in North America. Of the 23 collections, 20 had uniformly different virulence patterns, i.e., each of the 20 collections was a different race, and all five isolates of each collection had the same virulence pattern. Two collections consisted of isolates with two virulence patterns, and one collection consisted of isolates with three virulence patterns [...]