Relationship between virulence variation and DNA polymorphism in Puccinia striiformis f.sp. tritici.

To determine the relationship between virulence and DNA polymorphism,and to evaluate usability of SSR marker in detecting population genetic diversity of Puccinia striiformis f.sp.tritici,relationship between virulence variation and DNA polymorphism of 90 isolates of Puccinia striiformis f.sp.tritici were studied.17 pathotypes and 75 genotypes were found,suggesting DNA polymorphism was much more diversity than virulence.Moreover,there were the same or near genotype in different races,and the same race may be had different genotype.There was no relativity between virulence and DNA polymorphism.SSR markers are considered appropriate for population genetic diversity analysis.