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A Yield-Component Selection Experiment Involving American and Iranian Cultivars of the Common Bean¹

A cross was made between Iranian and American bean (Phaseolus vulgaris L.) cultivars. Five percent of the plants having the most pods per plant in the F₂ and F₃ generations were selected for production of F₃ and F₄ lines. Heritability (narrow sense) of yield components was evaluated in F₂ and F₃ populations. Heritability for pods per plant was 29%, for seeds per pod 38 to 42%, and for 100-seed weight 33 to 37%. The average dominance of genes for all components suggested partial or nearly complete dominance. To determine genetic advance, F₃ and F₄ lines were compared with the mid-parent for pods per plant, seeds per pod, and 100-seed weight. The differences between mid-parent and selected F₄ lines for pods per plant and seeds per pod were significant. Genetic advance for these characters was 30 and 19%, respectively. The results show that heritabillty for yield components in F₂ and F₃ populations is high enough to be useful for selection. Selection is usually made directly for yield. In this particular cross selection was made for pods per plant and promising productive lines with important Iranian marketing characteristics were obtained.

Key Words: Heritability • Genetic advance • Phaseolus vulgaris L.

² Associate professor, Dep. of Plant Breeding, College of Agriculture, P.O. Box 209, Karadj, Iran.

Received for publication April 8, 1976.