genetic dissection of grain quality traits in rice oryza sativa l

Abstract

newline genetic dissection of grain quality traits in rice oryza sativa l newline newline newline ABSTRACT newlineThe present investigation was conducted with four lines and five testers in Line × Tester fashion to study the per se performance, combining ability effects of parents and hybrids, heterosis, gene action, variability and association analysis among grain yield and quality traits in rice. newlineThe analysis of combining ability and generation mean revealed that single plant yield was under the control of dominance, additive × additive and dominance × dominance interactions with complementary epistasis. Plant height, number of productive tillers per plant, panicle length, flag leaf length and number of filled grains per panicle were governed by dominance and dominance × dominance interaction effects along with either complementary or duplicate epistasis. Predominance of dominance, additive × dominance, dominance × dominance and duplicate epistasis were observed for hulling percentage, milling percentage and gel consistency whereas dominance, additive × additive and dominance × dominance interaction effects were noticed for head rice recovery, kernel breadth, milled rice length, milled rice breadth, breadthwise expansion ratio and amylose content. The linear elongation ratio of grain was controlled by dominance, additive × additive and additive × dominance epistasis. newlineBoth additive and dominance gene action with the interaction effects of additive × additive and dominance × dominance were noticed for days-to-50 per cent flowering, hundred grain weight, kernel L/B ratio, kernel breadth after cooking and alkali spreading value besides complementary or duplicate epistasis. Kernel length and kernel length after cooking were under the control of additive gene action with additive × dominance epistatic interaction. To explore both additive and dominance gene action, selection should be postponed to later generations for effective development of superior genotypes. newlineEvaluation of parents based on per se performance and gca effects indicated that MDU