Compining ability for yield and some agronomic traits in diallel crosses of ten new yellow maize inbred lines
2011
Sadek, M.S.E. | Abd El-Aal, A.M.M. | Osman, M.M.A.
A diallel cross among ten newly developed yellow maize inbred lines excluding reciprocals was made during 2009 summer season. These inbred lines were derived from French populations i.e. FP.POP 2o F1o(P1) FP.POP6FI5(P2) FP.POP9F19(P3) FP.POP28 FT21(P4) FP.POP34F13(P5) FP.POP39F31(P6) FP.POP9F40(P7) FP. POP12F41(P8) FP.POP42Fso(P9) and FP.POP2sF52(P10).The resulting 45 crosses along with three yellow commercial check hybrids; SC162, SC164 and SC166 were evaluated during 2010 summer season at two locations (Gemmeiza and Mallawy). The main objectives of this study were identifying the most superior hybrids for further use in maize breeding program and improving high yielding yellow single cross hybrids. The results showed that the mean squares were highly significant for all the studied traits, except for ears/100 plants for the interactions of location x genotype; location x general combining ability (GCA) and location x specific combining ability (SCA). Variances due to GCA (additive) and SCA (non-additive) were involved in the inheritance of the studied traits, with the additive gene action playing the major role in the inheritance of these traits, except for grain yield and plant height, which were controlled by non additive gene action. Parental inbred lines Ps and P7 had the highest favorable GCA effect for 50% silking, and plant height, respectively. Parent 4 (P4) and Ps were the best donors for more ears/plant, and P1andP9 were the best for high grain yield. Crosses (P3 X P7) (P4 x P8) and (P9 x Pl0) showed negative and significant SCA effects for silting date (desirable). While crosses (P2 x Ps) and (P6 x P9) significantly outyielded the commercial yellow check hybrids SC 162 and SC 164. Therefore, these crosses may be released as new high yielding single crosses.
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