Virulence pattern and emergence of new pathotypes in Puccinia striiformis f. sp. tritici during 2011-15 in India

Authors

  • O.P. GANGWAR*, SUBODH KUMAR, PRAMOD PRASAD, S.C. BHARDWAJ, HANIF KHAN and HEMLATA VERMA

Keywords:

Virulence, stripe rust, Resistance, Dynamics, wheat

Abstract

Stripe (yellow) rust of wheat is one of the most devastating diseases worldwide in cooler climate. For successful stripe rust management, monitoring of the virulence spectrum of the pathogen is of prime importance to detect new pathotypes. The purpose of this research was to survey wheat fields to determine the prevalence of stripe rust, characterize the pathotypes structure of Puccinia striiformis f. sp. tritici (Pst) in North-Western plains, Northern hills and Southern hills zone of India. Pathotypes characterization was performed by inoculating Indian sets of differentials. Seventeen Pst pathotypes were identified during 2011-15 from the analyses of 1571 Pst isolates (stripe rust samples). Of these, seven pathotypes were identified for the first time and designated as 46S117, 110S119, 238S119, 110S84, 110S247, 7S0 and 6S0. Cluster analysis categorised these pathotypes into ten distinct virulence groups based on simple matching coefficient of virulence/avirulence on sixteen differentials. Pathotype 46S119 occurred in maximum (65.16%) stripe rust samples followed by pt.78S84 (22.19%). The frequency of PBW343 (Yr27) virulent pt. 78S84 decreased from 32% in 2011-12 to 3% in 2014-15. The relative Shannon diversity index (HSR) was non-significant over the years that is indicative of low diversity existing in population of stripe rust pathogen. New pathotypes 7S0 and 6S0 possess virulence for Yr1, Yr6, Yr7 and Yr6, Yr7, respectively. Other five new pathotypes appeared to have evolved as a result of mutation in type culture pathotypes.

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Issue

Vol. 69 No. 4s (2016): Indian Phytopathology : Special Issue

Section

Research Articles

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How to Cite

PRAMOD PRASAD, S.C. BHARDWAJ, HANIF KHAN and HEMLATA VERMA, O. G. S. K. (2016). Virulence pattern and emergence of new pathotypes in Puccinia striiformis f. sp. tritici during 2011-15 in India. Indian Phytopathology, 69(4s), 178-185. http://epubs.icar.org.in/ejournal/index.php/IPPJ/article/view/71274