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A new pathotype of Puccinia graminis f.sp. tritici (wheat stem rust) in India

Indian Phytopathological Society


17-SK-Jain.pmd Indian Phytopath. 64 (1) : 78-79 (2011) A new pathotype of Puccinia graminis f.sp. tritici (wheat stem rust) in India S.K. JAIN, M. PRASHAR, S.C. BHARDWAJ*, S. B. SINGH, Y.P. SHARMA and B.K. HONRAO1 Directorate of Wheat Research Regional Station, Flowerdale, Shimla 171 002 1Agharkar Research Institute, G.G. Agharkar Road, Pune 411 004 Key words: Sr9b, Sr genes, stem rust, virulence, wheat Rust surveys conducted with the aim of monitoring wheat rust variants forms an integral part of resistance breeding. This exercise not only provides information on their prevalence in different wheat growing areas of the country but also the virulent phenotypes of different rust variants. The knowledge thus generated is used to select resistance genes (varieties) that helps in addressing the challenge posed by sudden emergence of these new variants. If not addressed in time, these variants are capable of causing large-scale damage to wheat yield. This fact was recently underscored with the emergence of Ug99, a virulence of stem rust, from Uganda (6, 8) and alarm was raised at global level to diversify stem rust resistance for avoiding heavy losses. In India, annual race surveys are being carried out regularly. These surveys have helped in identification of new variants and sources of resistance that has enabled us to address the challenges posed by such variants. Consequently, India has been able to avoid epidemics since last forty years with detection of new variants before these became widespread and caused economic losses. Stem rust of wheat in India, though endemic in South India particularly in Nilgiri Hills and North hills of Karnataka (3, 4) continues to raise concern for the wheat crop in the country. Despite very low occurrence of stem rust in this region, many variants of stem rust have been picked up in the recent past. The present study reports recently detected new variant 184-1 (55G-1) of wheat stem rust (Puccinia graminis Pers. f. sp. tritici Eriks. E. Henn.) and s

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