4.3 Article

Comparative virulence phenotypes and molecular genotypes of Puccinia striiformis f. sp tritici, the wheat stripe rust pathogen in China and the United States

Journal

FUNGAL BIOLOGY
Volume 116, Issue 6, Pages 643-653

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.funbio.2012.03.004

Keywords

Phylogenetic relationship; Puccinia striiformis f. sp tritici; Stripe rust; Yellow rust

Categories

Funding

  1. US Department of Agriculture, Agricultural Research Service [5348-22000-014-00D]
  2. Washington Wheat Commission [13C-3061-3923]
  3. PPNS [0564]
  4. Department of Plant Pathology, College of Agricultural, Human, and Natural Resource Sciences, Agricultural Research Center [WNP00823]
  5. Washington State University, Pullman [WA 99164-6430]
  6. USA
  7. Agro-scientific Research in the Public Interest of China [200903035-02]
  8. Ministry of Education of China [B07049]

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Stripe rust (yellow rust) of wheat, caused by Puccinia striiformis f. sp. tritici, is one of the most important diseases in both China and the United States. The Chinese and US populations of the stripe rust fungus were compared for their virulence phenotypes on wheat cultivars used to differentiate races of the pathogen in China and the US and molecular genotypes using simple sequence repeat (SSR) markers. From 86 Chinese isolates, 54 races were identified based on reactions on the 17 Chinese differentials and 52 races were identified based on the 20 US differentials. The selected 51 US isolates, representing 50 races based on the US differentials, were identified as 41 races using the Chinese differentials. A total of 132 virulence phenotypes were identified from the 137 isolates based on reactions on both Chinese and US differentials. None of the isolates from the two countries had identical virulence phenotypes on both sets of differentials. From the 137 isolates, SSR markers identified 102 genotypes, of which 71 from China and 31 from the US. The virulence data clustered the 137 isolates into 20 virulence groups (VGs) and the marker data clustered the isolates into seven molecular groups (MGs). Virulence and SSR data had a low (r = 0.34), but significant (P = 0.01) correlation. Principal component analyses using either the virulence data or the SSR data separated the isolates into three groups: group a consisting of only Chinese isolates, group b consisting of both Chinese and US isolates and group c consisting of mostly US isolates. A neighbour-joining tree generated using the molecular data suggested that the P. striiformis f. sp. tritici populations of China and the US in general evolved independently. Published by Elsevier Ltd on behalf of The British Mycological Society.

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