Heterosis and combining ability for quantitative traits in fodder Sorghum (Sorghum bicolor L.)
Keywords: Sorghum bicolor, Combining ability, Gene action, Partial diallel, Heterosis,
AbstractCombining ability and heterosis for some fodder yield and its component traits were studied among nine sorghum crosses
and their six parents in a randomized complete block design with three replications under irrigated conditions. Highly
significant differences for genotype, general combining ability and specific combining ability were observed for all the
characters under assessment. However, general combining ability variances were lower than the specific combining ability
variances for all the evaluated parameters. All the traits under study showed greater dominant variance than the additive
variance having degree of dominance greater than unity. The sorghum line V-1 indicated the highest general combining
ability effects in the desired directions for plant height, TSS-9 for number of tillers plant-1 and CVS-13 for stem thickness,
fresh weight plant-1 and dry weight plant-1. All the nine crosses depicted significant and positive mid-parent as well as better
parent heterosis for fresh weight plant-1 and dry weight plant-1. The present study indicated that improvement in fodder yield
is feasible due to overall better performance of genotypes having significant better parent heterosis along with good general
combiner parents (CVS—13).
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