Estimation of heterosis and combining ability in azukibean under highland growing conditions in Thailand
2006
Weerapun Kunkaew(Chiang Mai University, Chiang Mai (Thailand). Royal Project Foundation) | Suthat Julsrigival(Chiang Mai University, Chiang Mai (Thailand). Faculty of Agriculture. Department of Agronomy) E-mail:[email protected] | Chuckree Senthong(Chiang Mai University, Chiang Mai (Thailand). Faculty of Agriculture. Department of Agronomy) | Dumnern Kaladee(Chiang Mai University, Chiang Mai (Thailand). Faculty of Agriculture. Department of Agronomy)
Four varieties of azukibean (Vigna angularis) were used in a diallel cross without reciprocals to study heterotic performance and combining ability for seed yield and yield components in F1 hybrids at two altitudes (700 m and 1,200 m above sea level) in northern Thailand during the August to December 2003 growing season. Heterotic effects and combining abilities differed between altitudes. F1 hybrids exhibited both negative and positive heterotic effects on seed yield per plant over their mid-parents and better parents which, averaged over the two test sites, were -0.6 to 31.8 percent and -10.7 to 20.5 percent, respectively. Analysis of data for component traits indicated the importance of both additive and non-additive gene effects for number of branches per plant, seed size and seed yield per plant. The only statistically significant interaction with test site involved specific combining ability for seed yield per plant.
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