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Genetic diversity of Puccinia striifomris f. sp. tritici from China and Sweden

Bo Liu: Institute of Plant Protection Chinese Academy of Agricultural Sciences

<div>Wheat stripe rust, caused by obligate biotrophic fungus <em>Puccinia striiformis</em> f. sp. <em>tritici </em>(<em>Pst</em>), is considered one of the most destructive diseases of wheat worldwide. Since <em>Berberis</em> spp. grow in both China and Sweden, the importance of the alternate host for the genetic diversity of <em>Pst</em> in the two countries were compared. Single-uredinium isolates of <em>Pst</em> from Gansu, Sichuan, and Yunnan provinces of China and Klagstorp, Uppåkra, and Öland regions of Sweden sampled in 2015 were genotyped with 9 simple sequence repeat (SSR) markers. Multilocus genotypes (MLG) were identified and the genotypic diversity for the Chinese population was much higher than the Swedish population. Although not any MLG was common in both countries, a few MLGs from Sweden were closely related to some MLGs from Yunnan. All regional populations except Gansu were in linkage disequilibrium, indicating that only the <em>Pst</em> population in Gansu was likely reproduced sexually through alternate host plants.</div>