Heterotic effects for root lodging resistance in F1 hybrids among dent and flint inbred lines of silage maize

Koinuma, K.; Ikegaya, F.; Ito, E.

Maydica 43(1): 13-17

1998


ISSN/ISBN: 0025-6153
Accession: 003160153

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Abstract
To clarify the mode of inheritance of the root lodging resistance in maize (Zea mays), 10 resistant inbred lines (five dent and five flint lines) and a half diallel set of F1 hybrids among them were analysed for the percentage of lodged plants from 1991 to 1993 and horizontal pulling resistance (HPR) value in 1991 and 1992. Additive and dominance effects were calculated using Morley-Jones' method [see Heredity (1965) 20, 117-121] of diallel analysis. Diallel analysis gave almost the same results for both the percentage of lodged plants and HPR-value. Additive effects (a) were significant (P<0.01 for the percentage of lodged plants and P<0.05 for the HPR value). Dominance effects averaged over all hybrids (b1) and those due to parental lines (b2) were not significant, but dominance effects due to specific combinations (b3), i.e., specific combining ability (SCA) effects, were significant (P<0.01). Interactions of b3 with years were not significant, but those of a, b1, and b2 were significant (P<0.01). Percentages of lodged plants and HPR-values were lower in dent x flint hybrids than in dent x dent and flint x flint hybrids. On the other hand, rates of dry matter production were higher in dent x flint hybrids than in dent x dent and flint x flint hybrids. The results obtained indicate that SCA effects between dent and flint inbred lines are expressed in the root lodging resistance as well as dry matter production and that hybrids with a high yielding ability and high resistance to root lodging can be developed effectively by combining dent inbred lines with flint ones if the root lodging resistance is adequately improved.