Abstract
Abstract The inheritance of interlocular cavitation (IC), characterized by rupture of the soft, parenchymatous endocarp tissue between the seed locules in developing snap bean pods, was studied using 6 parental cultivars, all 30 possible F1 progenies grown in the greenhouse, and the 30 F2 families grown at various planting dates at 2 field locations. IC appeared to be a highly heritable character conditioned by a predominantly additive polygenic system with partial dominance for resistance. Reciprocal effects were negligible. Neither epistasis nor transgressive segregation was detected. Order of susceptibility among genotypes was maintained over the wide range of environments. Genotype × environment interaction was significant, but was relatively small compared to total genetic variability. Association between greenhouse-grown F1 and field-grown F2 plants was high for degree of IC, suggesting that F1 performance might be informative in choosing superior crosses. Breeding progress appears to be feasible in a program designed to utilize the large amount of additive genetic variance.
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