Components of genetic variance and degree of dominance for grain and fodder yields in sorghum (Sorghum bicolor L. Moench)
AbstractGenetic analysis for grain and fodder yield in sorghum genotypes using six generation means indicated the major role of additive genetic effects (d) for days to maturity and grain yield in both the crosses viz., EP 82 x CRS 1 and CSV 14R x SPV 1375. The cross EP 82 x CRS 1 indicated additive variance for plant height and grain yield while the cross CSV 14 R x SPV 1375 for days to maturity, plant height, panicle length, test weight and grain yield. Among the epistatic components of genetic variance, the fixable additive x additive component (i) was significant for almost all the traits except, days to 50% flowering in the cross EP 82 x CRS 1 and fodder yield in the cross CSV 14 R x SPV 1375. The characters exhibiting significant and positive additive genetic effects invariably were accompanied by additive x additive (i) interaction effects for plant height in the cross EP 82 x CRS1. However, the presence of positive and significant additive x additive interactions along with additive genetic effects for test weight in the cross EP 82 x CRS1 indicate the predominance of interaction component rather than their direct influence. Additive as well as additive x additive interaction effects with duplicate epistasis were observed in the cross EP 82 x CRS1 for plant height. Grain yield exhibited significant dominance variance in the cross CSV 14R x SPV 1375. Fodder yield exhibited significant dominance and dominance x dominance interactions in the cross CSV 14R x SPV 1375
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