Assessing the vulnerability of wheat germplasm from Bangladesh and Nepal to Ug99 stem rust

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• 作者：Z. A. Pretorius ; R. Prins ; P. K. Malaker ; N. C. D. Barma ; M. A. Hakim…
• 关键词：Puccinia graminis ; Triticum aestivum ; Ug99
• 刊名：Phytoparasitica
• 出版年：2015
• 出版时间：November 2015
• 年：2015
• 卷：43
• 期：5
• 页码：637-645
• 全文大小：365 KB
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• 作者单位：Z. A. Pretorius (1)
  R. Prins (1) (2)
  P. K. Malaker (3)
  N. C. D. Barma (4)
  M. A. Hakim (3)
  D. Thapa (5)
  U. Bansal (6)
  G. L. Cisar (7)
  R. F. Park (6)
  
  1. Department of Plant Sciences, University of the Free State, Bloemfontein, 9300, South Africa
  2. CenGen (Pty) Ltd, 78 Fairbairn St., Worcester, 6850, South Africa
  3. Wheat Research Centre, BARI, Dinajpur, 5200, Bangladesh
  4. Regional Wheat Research Centre, BARI, Gazipur, 1701, Bangladesh
  5. Agriculture Botany Division, Nepal Agricultural Research Council, Khumaltar, Lalitpur, Nepal
  6. The University of Sydney Plant Breeding Institute Cobbitty, Private Bag 4011, Narellan, NSW, 2567, Australia
  7. International Programs, 252 Emerson Hall, College of Agriculture and Life Sciences, Cornell University, Ithaca, New York, 14853, USA
  
• 刊物主题：Plant Pathology; Plant Sciences; Ecology; Agriculture; Life Sciences, general;
• 出版者：Springer Netherlands
• ISSN：1876-7184

文摘

Bread wheat (Triticum aestivum) is an important crop in South Asia and epidemics of stem rust, caused by Puccinia graminis f. sp. tritici, can impact negatively on food security. In a pro-active assessment of the risk posed by this disease, germplasm collections received from Bangladesh and Nepal in 2011 were screened for their response to Sr31-virulent stem rust races belonging to the Ug99 group. According to a molecular marker assay, 44% of Bangladesh lines and 48% of Nepal lines contained Sr31. In seedling tests, most entries were susceptible to P. graminis f. sp. tritici race PTKST, confirming the ineffectiveness of Sr31. No lines contained Sr24 or Sr36, two major genes that have been overcome by races within the Ug99 group. Despite seedling susceptibility, many lines exhibited high levels of adult plant resistance in the field. The presence of the Sr2 marker allele of csSr2 in some of these lines indicated that this gene is likely to play a role in the adult plant resistance observed. This study showed that sufficient protection to Ug99 exists in Bangladesh and Nepal wheat germplasm, and that the appropriate release of resistant cultivars will insure against a possible future incursion of this dangerous pathogen. Keywords Puccinia graminis Triticum aestivum Ug99