Combining Ability and Mean Performance of Some New Inbred Lines of Yellow Maize Through Line × Tester Method | ||||
| Journal of Plant Production | ||||
| Article 2, Volume 9, Issue 9, September 2018, Page 723-732 PDF (445.51 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2018.36396 | ||||
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| Authors | ||||
| M. S. Sultan1; S. E. Sadek2; M. A. Abdel Moneam3; M. S. Shalof2 | ||||
| 1Agronomy Department, Faculty of Agriculture , Mansoura University, Egypt . | ||||
| 2Maize Research Department , Field Croup Institute , Agriculture Research Center, Egypt | ||||
| 3Agronomy Department, Faculty of Agriculture , Mansoura University, Egypt | ||||
| Abstract | ||||
| In Egypt, there are several maize production constraints, among which shortage of improved varieties is the major one. The objective of this study was to observe the mean performance of crosses and estimate combining abilities for grain yield and other agronomic traits in nine maize inbred lines and three testers using Line × Tester mating design. 27 yellow single crosses , 9 inbred lines , three testers and two standard checks (SC162 and SC168) were evaluated at two locations (Gemmeiza and Mallawy) under two density (24000 plant /fed and 30000 plant /fed). Analyses of variances showed significant mean squares for studied traits. Lines , tester and hybrids mean squares were highly significant and significant at combined data over two densities. Among the crosses, P1 × Gm 174 , P6 × Gm 1021 , P7 × Gm 1021 and P8 × Gm 1021 highest grain yield mean performance and highly significant and significant in studied traits at combined data over both densities and these crosses may be useful for improving grain yield of maize. GCA effects, Inbred lines P6 , P8 , P2 , P7, Gm 174 andGm1021 had significant and highly significant positive GCA effects and were the best general combiners for grain yield, and hence were promising parents for hybrids as well as for inclusion in breeding programs for yield improvement. Inbred line Gm 1021 could be considered as a good general combiner for earliness and parental inbred lines P1 , P4 and Gm 1002 could be considered as a good general combiners for lateness for day to 50% tasseling, indicating that the line Gm 1021had general combinations that can enhance early maturity. P1×Gm 174 , P2×Gm 1002 , P3×Gm 1002, P4×Gm 174, P5×Gm 1021 , P6 ×Gm 1021, P7×Gm 1002 and P8×Gm 1002 had highly significant and significant positive SCA effects for grain yield trait. it could be concluded that the parental inbred line for that crosses could made themselves recombination's. The information of GCA and SCA effects for grain yield is very useful for maize breeders to determine which maize line should be selected to improve local lines and which parental lines should be used for making hybrids with greater grain yields. | ||||
| Keywords | ||||
| Maize; Line × tester; General combining ability; Specific combining ability | ||||
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