Genetics of resistance to Puccinia graminis tritici and Puccinia recondita tritici in Kenya Plume wheat |
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| Authors: | R P Singh R A Mcintosh |
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| Institution: | (1) Plant Breeding Institute, The University of Sydney, P. O. Box 180, 2154 Castle Hill, N.S.W., Australia;(2) Present address: CIMMYT, Londres 40, Mexico 6, D.F., Mexico |
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| Abstract: | Summary Seven genes, viz. Sr5, Sr6, Sr7a, Sr8a, Sr9b, Sr12 and Sr17 were associated with seedling resistance to Puccinia graminis tritici in Kenya Plume wheat. The predominant field cultures were avirulent on seedlings with Sr7a, but possessed virulence for the other six genes. However, Sr7a did not confer adult-plant resistance when present on its own. Adult-plant resistance was attributed to Sr2 and possibly also to the interaction of Sr7a and Sr12.Two genes, Lr13 and Lr14a, were identified in seedling tests with various cultures of Puccinia recondita tritici. Lr13 conferred adult-plant resistance to the predominant field strains. Genetic recombination between Lr13 and Sr9b was estimated at 17.6±3.1%. |
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| Keywords: | Triticum aestivum wheat Puccinia graminis tritici stem rust Puccinia recondita tritici leaf rust rust resistance seedling resistance adult-plant resistance genetic linkage |
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