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DOI: 10.3852/08-098
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Mycologia, 102(1), 2010, pp. 44-53.
© 2010 by The Mycological Society of America

Puccinia striiformis f.sp. tritici presents high diversity and recombination in the over-summering zone of Gansu, China


X. Duan

     State Key Laboratory of Biology for Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100094, China

A. Tellier

     Section of Evolutionary Biology, LMU BioCenter, 2 Grosshaderner Straße 82152 Planegg-Martinsried, Germany

A. Wan

     Department of Plant Pathology, Washington State University, PO Box 646430, Pullman, Washington 99164-6430

M. Leconte

     INRA, UMR BIOGER CPP, F-78850 Thiverval-Grignon, France

C. de Vallavieille-Pope

     INRA, UMR BIOGER CPP, F-78850 Thiverval-Grignon, France

J. Enjalbert 1

     INRA, UMR 0320/UMR 8120 Génétique Végétale, F-91190 Gif-sur-Yvette, France

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.

Key words: effective size, linkage disequilibrium, parasexuality, survival, wheat (stripe) yellow rust

1 Corresponding author. E-mail: enjalbert{at}moulon.inra.fr






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