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Heterosis and Combining Ability of Seed Protein, Yield and Yield Components in Long Bean¹

Seven cultivars of long bean (Vigna sesquipedalis Fruw.) were crossed in diallel; the parents and F₁'s were evaluated in the field in 1973. Out of 42 hybrids, only three had seed protein contents significantly greater than the higher parent values. A majority of the hybrids yielded more than the higher parent. The amount of heterosis ranged from 40.7% below to 63.2% above the higher parent values. Of these, however, only two were statistically significant. Among the yield components, pods per plant showed the greatest amount of heterosis. Heterosis in seeds per pod, pod length, and seed weight were relatively low.

Both general combining ability (GCA) and specific combining ability (SCA) were important for all traits measured except pod yield where only GCA was significant. Good combiners for pod yield were poor combiners for seed protein content and the SCA effects for yield depended mainly on the SCA values of the yield components.

Key Words: Seed protein • Yield • Yield components

² Lecturer in the Dep. of Genetics and Cellular Biology, Univ. of Malaya, Kuala Lumpur, Malaysia and associate professor in the Dep. of Agronomy and Horticulture, Univ. of Agriculture, Serdang, Malaysia, respectively.

Received for publication August 2, 1976.