Genotype X environment interaction in relation to diallel crosses for flower characters in bean (Lablab Purpureus)
2003
Khanam, S. (Bangladesh Agricultural Univ., Mymensingh (Bangladesh). Dept. of Genetics and Plant Breeding) | Newaz, M.A.
Diallel analysis includes combining ability effects and components of genetic variation. They were estimated over two environments for flower characters from a half-diallel cross by involving six parents. Both general combining ability (gca) and specific combining ability (sca) were important for all characters with preponderance of additive gene actions. Environment had significant effect on all characters except flowers/ inflorescence. Best general combiners were DS52, DS106. DS112 etc. Complete dominance was observed for flowering date in environment-2, flowers/inflorescence in environment-1 and pods/inflorescence in both environments. Over dominance was found for flowering date in environment-1 and partial dominance for flowers/inflorescence in environment-2 and for inflorescence/plant in both environments. Characters were governed by asymmetrical distribution of positive and negative alleles. Dominant and recessive genes were equally distributed for flowering date and inflorescence/plant whereas unequally distributed for flowers/inflorescence and pods/ inflorescence. One or two gene groups were involved in flower characters of lablab bean.
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