Research Papers : Genetic basis of stripe rust resistance in transgressive derivatives of a cross between susceptible bread wheat parents
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Authors
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Rupinder Pal Singh
Punjab Agricultural University, Ludhiana, Punjab
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Puja Srivastava
Punjab Agricultural University, Ludhiana, Punjab
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Achla Sharma
Punjab Agricultural University, Ludhiana, Punjab
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N. S. Bains
Punjab Agricultural University, Ludhiana, Punjab
Abstract
Parental lines, F1s, F2 populations as well as F3 and F4 families and F6, F7 RILs from bread wheat cross PBW 621 x
HD 2967 were evaluated for stripe rust resistance against a highly virulent pathotype in experiments spanning six crop
seasons. HD2967, the widely cultivated wheat variety in North Western Plains of India and PBW 621 have shown
successively lowered levels of stripe rust resistance over the years. F1 of these parents showed lack of dominance.
The segregation pattern for stripe rust resistance in F2, F3 and F4 showed transgressiveness for resistance. Chi-square
analysis indicated that resistant segregants possess two genes, one contributed by PBW 621 and the other by HD
2967. These results were confirmed over two years using F6 and F7 RILs. Possible genetic mechanisms for this residual
resistance and implications for breeding programme are discussed.