Genetic effects of qunatitative traits in nodulation and nitrogen fixation in mungbean (Vigna radiata (L) Wilczek)
1997
Del Rosario, E.E. | Hautea, R.A. | Lantican, R.M. (Philippines Univ. Los Banos, College, Laguna (Philippines). Inst. of Plant Breeding)
A 7-parent partial diallel study of diverse mungbean genotypes was conducted to determine the magnitude of general combining ability (GCA) and specific combining ability (SCA) mean squares and effects for nodulation, biological nitrogen fixation (BNF) and BNF-associated agronomic characters. Traits evaluated were number of primary root, nodules, number of secondary root nodules, total number of root nodules, nodule score, nodule weight, total nitrogen, nitrogen uptake, percent nitrogen derived from atmosphere (percent ndfa), amount of nitrogen fixed, days to flower, plant vigor, plant height, shoot dry weight, and seed yield. Combining ability analysis showed that GCA and SCA mean squares were both significant for most traits. Estimates of GCA were of greater magnitude than the SCA indicating that a large portion of the total genetic variance for each trait resulted from action of genes with additive genetic effects. Accessions 658 and 638 had the largest GCA effects for most traits studied. Acc. 658 had the largest GCA effects for number of primary root nodules, total number of root nodules, nodule score, nodule weight, days to flower, plant vigor, plant height, shoot dry weight and seed yield. Acc. 638 had the largest GCA effects for numbr of secondary root nodules, nitrogen uptake, percent ndfa and amount of nitrogen fixed. Large SCA effects were observed mostly in crosses EG 1240 x Acc. 379, Acc. 638 x Acc. 379 and Acc. 658 x Pag-asa 7. Phenotypic correlation analysis showed significant relationships among BNF traits studied. The implications of the different genetic estimates on the improvement of BNF potential in the population are discussed
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