The purpose of this study was to determine the genetic control of common bean resistance to pathotype FOP 46, Fusarium oxysporum f.sp. phaseoli and estimate the genetic parameters of disease resistance. In greenhouse, the resistance evaluations were conducted in F2:3 families from crosses Milionário 1732 x Macanudo and FT Tarumã x Macanudo. Disease severity was evaluated 12 days after inoculation using a scale ranging from 1(no symptoms of wilting) to 9 (plants totally wilted and/or dead). The observed frequency of susceptible and resistant F2:3 plants derived from selfing of F2 plants from the cross Milionario 1732 x Macanudo and FT Tarumã x Macanudo indicated one major gene effect with incomplete dominance. The appearance of transgressive genotypes in family F2:3 suggests the oligogenic nature of resistance to Fusarium wilt. High heritability and prediction of selection gain were estimated for both crosses.
Phaseolus vulgaris; physiological race; genetic resistance; inheritance
