Document Detail


Puccinia striiformis f.sp. tritici presents high diversity and recombination in the over-summering zone of Gansu, China.
MedLine Citation:
PMID:  20120228     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Puccinia striiformis f.sp. tritici (PST), a basidiomycota responsible for wheat yellow rust, has a strict clonal behavior and a low genetic diversity in European and Australian populations. On the other hand high diversity has been reported in Chinese populations. Moreover it is thought that in China yellow rust epidemics start recurrently from the western highlands where over-summering occurs. To compare PST genetic diversity in this area to the one described in France seven AFLP primer combinations were used to analyze a sample of 160 isolates collected in 2001 in five counties of Gansu Province. The AFLP data revealed 40 polymorphic bands, discriminating 139 AFLP genotypes. Linkage disequilibrium and phylogeographic analyses support the hypothesis of a reproductive mode that is not strictly clonal. In this regard Chinese isolates from Gansu strongly contrast with the European studies using the same markers. Genetic diversity of this 1 y sampling in Gansu is found to be seven times higher than the one observed in France over 20 y and exhibits lower linkage disequilibrium. The effective population size of the French sample was estimated to be 1000 times smaller than the Gansu population. These results support the hypothesis of large population size as well as the occurrence of genetic recombination, while the importance of Gansu as a main over-summering area requires assessment through larger scale studies.
Authors:
X Duan; A Tellier; A Wan; M Leconte; C de Vallavieille-Pope; J Enjalbert
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Mycologia     Volume:  102     ISSN:  0027-5514     ISO Abbreviation:  Mycologia     Publication Date:    2010 Jan-Feb
Date Detail:
Created Date:  2010-02-02     Completed Date:  2010-04-01     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0400764     Medline TA:  Mycologia     Country:  United States    
Other Details:
Languages:  eng     Pagination:  44-53     Citation Subset:  IM    
Affiliation:
State Key Laboratory of Biology for Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100094, China.
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MeSH Terms
Descriptor/Qualifier:
Amplified Fragment Length Polymorphism Analysis
Basidiomycota / classification,  genetics*
China
DNA, Fungal / analysis
France
Genetic Variation*
Linkage Disequilibrium
Plant Diseases / microbiology
Plant Leaves / microbiology
Population Density
Recombination, Genetic*
Seasons
Triticum / microbiology*
Chemical
Reg. No./Substance:
0/DNA, Fungal

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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