Inheritance and Nature of Resistance in Beans toFusarium oxysporumf. sp.phaseoli

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Abstract
Strains of F. oxysporum f. sp. phaseoli, representing 2 distinct pathogenic races, were used to study the mode of inheritance and the nature of yellows resistance in beans [Phaseolus vulgaris]. Analysis of progenies of each of the crosses between 4 resistant cultivars and a susceptible cultivar indicated that a single gene controls resistance to each race. Resistance to a race from Brazil apparently is controlled by a dominant gene tentatively designated as Fop 1. This gene is present in the cultivars ''Tenderette'', ''Pintado'' and possibly ''Early Gallatin''. Resistance to a race from the USA apparently is controlled by an incompletely dominant gene tentatively designated as Fop 2. The heterozygous F1 progeny of the cross of resistant (Preto Uberabinha) and susceptible cultivars displayed a degree of resistance to the USA race lower than that of the resistant parent. Resistance to both races of the fungus is expressed by a restriction of distribution and/or growth of the pathogen in the vascular system of inoculated plants.

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