Genetic analysis of nitrate reductase activity in relation to yield heterosis in sorghum sorghum bicolor

Mishra, S.P.; Sinha, S.K.; Rao, N.G.P.

Zeitschrift fuer Pflanzenzuechtung 86(1): 11-19


Accession: 005511253

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Fourteen of 21 hybrids were heterotic for nitrate reductase (NR) activity. NR activity was confined to low .times. low and low .times. medium combinations, but not observed in low .times. high combinations. Differences for NR activity were highly significant for males, crosses, parents vs. crosses and females vs. males. The differences among females were not significant. Use of a high NR parent in cross could probably ensure a more than average NR activity in F1 hybrids. The genetic basis of NR activity studied in a line .times. tester mating system revelaed that the nature of gene action for NR activity is essentially non-additive. NR activity at flowering was positively correlated with yield. Male parents of established hybrids like IS 84, CS 3541 were consistent for heterotic NR activity. Not all specific combinations where NR activity was heterotic were necessarily the highest yielders.