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Genetics of resistance to indian races of stripe rust puccinia striiformis in tester heines vii of wheat triticum aestivum



Genetics of resistance to indian races of stripe rust puccinia striiformis in tester heines vii of wheat triticum aestivum



Indian Journal of Agricultural Sciences 62(9): 599-602



An experiment was conducted during 1989-90 and 1990-91 to study the genetics of resistance to stripe-rust (Puccinia striiformis West.) races in wheat (Triticum aestivum L. emend. Fiori and Paol.) tester 'Heines VII' . USing 'Lee' as the susceptible parent, the inheritance of resistance in 'Heines VII' was compared with 4 Indian races of stripe-rust in F1, F2 and F3 generations. Contrary to the expected presence of 1 dominant resistant gene Yr2, 1 dominant and 1 recessive genes were found operating for resistance to each of the races 14A, 20A, 31 and 38A in 'Heines VII'. When 2 races were inoculated to 2 different portions of a seedlings in different combinations in F2 generations, the pattern of segregation indicated that independent genes operated against race combinations 31 and 14A, and 20A and 14A, whereas there could be a linkage between the genes for resistance to races 20A and 31. These observations indicate the presence of previously undetected genes for stripe-rust resistance in the tester variety 'Heines VII' to Indian races.

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