Inheritance of Resistance in Three Cultivars of Beans to the Bean Rust Pathogen and the Interaction of Virulence and Resistance Genes

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Abstract
Bean (P. vulgaris) cv. US#3 was resistant to single-pustule isolate S1-5 of U. phaseoli var. typica, but susceptible to isolate P10-1; ''Early Gallatin'' (EG) was susceptible to S1-5, but resistant to P10-1; and ''Pinto 111'' (111) was susceptible to both isolates. From the cross US#3 .times. EG the F1 seedlings were resistant to both isolates, while the F2 progeny segregated for 2 independent dominant resistance genes. F2 progenies of crosses 111 .times. EG and 111 .times. US#3 gave further evidence of these two genes. F2 progeny from the cross 111 .times. EG also gave evidence for possible complementary resistance genes effective against isolate S1-5. In US#3, a resistance gene Up1 was matched to 2 virulence loci. UpA1 and UpV3, in isolates P10-1 and S1-5. In EG, a resistance gene Up2 was matched to virulence locus UpA2 in the 2 isolates. This interaction of virulence and resistance genes indicates that the expression of resistance in beans and virulence in bean rust is dependent upon the genotype of the other organism, and the results provide evidence for a gene-for-gene relationship.

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