PJB-2004-61
GENE ACTION FOR SYNCHRONY IN POD MATURITY AND INDETERMINATE GROWTH HABIT IN MUNGBEAN (VIGNA RADIATA (L.) WILCZEK)
G. S. S. KHATTAK, M. ASHRAF* AND R. ZAMIR
Abstract
The nature of gene action for days to flowering, plant height at different growth stages, synchrony in pod maturity and indeterminate plant growth habit were assessed in two sets of crosses involving four parents through generation mean analysis. The mean data of six populations (both parents, F1, BC1, BC2 and F2) were subjected to joint scaling test. In the presence of epistasis, six-parameter model was used to detect all types of gene effects. The analysis indicated that most of the traits appeared to be complex in the expression of gene effects in both the crosses. Both additive (d) and dominant (h) gene effects were important in both the crosses for all the traits examined except days to first flower and first pod maturity in ML-5 x NM 54, where dominant gene effects were non-significant. The days to 90% pods maturity and plant height at first flower in case of 6601 x NM 92, and days to first pod maturity and plant height at first flower in ML-5 x NM 54 cross had showed no digenic interactions. The digenic interactions i.e., additive x additive (i), additive x dominance (j), and dominance x dominance (l) played an important role in the expression of all those traits which showed complex gene effects for their inheritance. The biparental approach is suggested for the exploitation of the complex inherited traits particularly for improved synchrony in pod maturity and determinate growth habit in mungbean.
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