Lr19 Resistance in Wheat Becomes Susceptible to Puccinia triticina in India

Plant Disease
S C BhardwajD Datta

Abstract

Lr19, a resistance gene originally transferred from Agropyron elongatum to wheat (Triticum aestivum L.), has remained effective worldwide against leaf rust (Puccinia triticina Eriks.) except in Mexico (1). This report records a new pathotype of P. triticina virulent on Lr19 from India. From 2003 to 2004, 622 wheat leaf rust samples from 14 states were subjected to pathotype analysis. Samples were established on susceptible wheat cv. Agra Local, and pathotypes were identified on three sets of differentials following binomial nomenclature (3). Virulence on Lr19 (Agatha T4 line) was observed in approximately 2% of samples. These samples were picked from Lr19 (NIL), cvs. Ajit, Lal Bahadur, Local Red, Lok1, and Nirbhay from Karnataka and Gujarat states. All Lr19 virulent isolates were identical. The reference culture is being maintained on susceptible wheat cv. Agra Local and has also been put under long-term storage in a national repository at Flowerdale. From 2004 to 2005, this pathotype was detected in 6.3% of samples from central and peninsular India. There is no wheat variety with Lr19 under cultivation in India, however, it is being used in wheat breeding programs targeted at building resistance against leaf and stem rusts. NI...Continue Reading

Citations

Oct 2, 2007·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·L Ayala-NavarreteP J Larkin
Mar 3, 2009·Functional & Integrative Genomics·Andrea GennaroCarla Ceoloni
Jun 9, 2020·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·K Rani Vinod

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