Resistance in maize to a third East African race of Puccinia polysora Underw |
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| Authors: | H. H. STOREY AUDRIE K. HOWLAND |
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| Affiliation: | East African Agriculture and Forestry Research Organization, Muguga, Kenya |
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| Abstract: | In 1961 a third race, EA. 3, of Puccinia polysora was recognized in Kenya. This was virulent to maize carrying either of the genes Rpp 1 or Rpp 2, previously isolated. Resistance to EA. 3 was found in many Central American maizes; in two, Andaqui (Colombia) and Zapalote Chico (Mexico), genes Rpp 10 and Rpp 11 were recognized. Rpp 10 was fully dominant and its genotypes highly resistant to both EA. 1 and EA. 3. Rpp 11 was incompletely dominant, but determined effective resistance to both races when homozygous. Experimental crosses gave no evidence of linkage between the genes Rpp 1, Rpp 10 and Rpp 11. |
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