Inheritance of temperature-dependent string formation in common bean (Phaseolus vulgaris L.).

String formation was analysed in F1, F2 and F3 generations of crosses between cultivars without string, with incomplete string and with complete string, and in B1 and B2 generations of the hybrid between a stringless and a stringy cultivar back crossed to the stringless parent. F1 plants were maintained at constant temperatures of 17 and 23 deg C, and the remaining plants were maintained at 23 deg C, to promote string formation. Segregation ratios suggested that two genes were involved in string development, stringlessness and complete string formation being controlled by the dominant and recessive alleles respectively of St, and incomplete string development, at high temperature and in genotypes with the dominant St allele, being controlled by the dominant allele of the second gene (Ts). (Abstract retrieved from CAB Abstracts by CABI’s permission)