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Inheritance of Early Maturity of Indeterminate Dry Bean

Dep. of Agronomy, Iowa State Univ., Ames, IA 50011
Dep. of Agronomy and Soils, Univ. of Puerto Rico, Mayaguez, PR 00708

^* Corresponding author.

Knowledge of the heritability and genetic relationships among traits associated with harvest maturity should facilitate selection of bean (Phaseolus vulgaris L.) genotypes having earlier harvest maturity. The objectives of this study were to estimate the narrow sense heritabilities of days to first flower (DFF), days to physiological maturity (DPM), and length of the reproductive period (HP) and to measure the genetic correlations among these traits. Progeny derived from three different crosses between early and later maturity indeterminate genotypes were evaluated for two planting dates at Isabela, PR. Narrowsense heritability estimates for DFF were generally large (0.29 to 0.75), which suggests that early generation selection for DFF in these populations would be successful. Narrow-sense heritability estimates for DPM were intermediate to large (0.31-0.63); however, magnitude of estimates varied between planting dates. Narrow-sense heritability estimates for RP of the three crosses were generally intermediate to low, indicating that selection for the RP trait would be most effectively conducted in replicated nurseries in advanced generations. F₃ lines with RP = 10 d longer than the parental genotypes were identified in all three crosses. Genetic correlation coefficients between DFF and DPM were positive and significant, ranging from r = 0.43 to r = 0.85. Genetic correlation coefficients between DFF and RP were generally negative and significant, suggesting that selection for a greater RP would likely be related to a reduced DFF. Genetic correlation coefficients between DPM and RP varied among crosses and between years.

Received for publication October 31, 1989.