Sexual reproduction contributes to genotypic variation in the population of Puccinia graminis in Tajikistan

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• 作者：Anna Berlin (1)
  Mahbubjon Rahmatov (2) (3)
  Hafiz Muminjanov (2)
  Jonathan Yuen (1)
  
• 关键词：Avena fatua ; Triticum aestivum ; microsatellites ; alternate host ; Berberis spp ; Puccinia graminis f. sp. tritici ; Puccinia graminis f. sp. avenae
• 刊名：European Journal of Plant Pathology
• 出版年：2015
• 出版时间：January 2015
• 年：2015
• 卷：141
• 期：1
• 页码：159-168
• 全文大小：297 KB
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• 作者单位：Anna Berlin (1)
  Mahbubjon Rahmatov (2) (3)
  Hafiz Muminjanov (2)
  Jonathan Yuen (1)
  
  1. Department of Forest Mycology and Plant Pathology, Swedish University of Agricultural Sciences, Box 7026, SE-750 07, Uppsala, Sweden
  2. Tajik Agrarian University, 146 Rudaki Avenue, 734017, Dushanbe, Tajikistan
  3. Department of Plant Breeding, Swedish University of Agricultural Sciences, Box 101, SE-230 53, Alnarp, Sweden
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Plant Pathology
  Plant Sciences
  Ecology
  
• 出版者：Springer Netherlands
• ISSN：1573-8469

文摘

Stem rust, caused by Puccinia graminis, is a potential threat to wheat production in Central Asia. To investigate if sexual reproduction is important for the epidemiology of the disease, the population biology of the fungus was studied. Samples of P. graminis were collected from six wheat fields and from wild oats within two of the wheat fields during the growing season of 2010. The population structure of P. graminis was investigated by evaluating a total of 121 single uredinia collected from wheat and wild oats, using nine polymorphic simple sequence repeat (SSR) markers. The results presented in this study indicate that there is a selection process by the grass host, in particular wheat, that favours certain clones, which in turn affects the population structure of P. graminis in Tajikistan. The genotypic variation was large, both within and between the wheat fields and three populations were in linkage equilibrium, indicating that sexual reproduction within the P. graminis population takes place. This leads to the conclusion that the presence of Berberis spp. in Tajikistan has an important role in the population dynamics of P. graminis within the country, even if the fungus must reproduce primarily in a clonal manner during most of the year. Results also confirm that the two formae speciales, P. graminis f. sp. tritici and P. graminis f. sp. avenae, are genetically different even if they were collected in the same field.