EVALUATION OF SOME EXOTIC YELLOW MAIZE INBRED LINES FOR COMBINING ABILITY USING LOCAL OPEN- POLLINATED TESTERS | ||
| Journal of Plant Production | ||
| Article 7, Volume 28, Issue 10, October 2003, Pages 7273-7280 PDF (2.2 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpp.2003.245246 | ||
| Authors | ||
| M. M. Abd EI-Maksoud,1; G. A. R. EI-Sherbeny2; A. H. Abd EI-Hadi1 | ||
| 1Dept. of Genetics, Fac. of Agric., Mansoura Univ., Mansoura, EGYPT. | ||
| 2Dept. of Botany (Genetics), Fac. of Agric., South valley Univ., Sohag, EGYPT. | ||
| Abstract | ||
| The main objective of this study was directed to evaluate combining ability effects of exotic lines, and to determine the mode of gene action, which control, grain yield and its components, as well as some morphological and earliness traits of yellow maize. Thus, four exotic yellow maize inbred lines were top crossed with two local populations as testers. The results from the evaluation of these genotypes revealed that Lines differ in their order performances, when crossed with each of male parent (tester). All top crosses showed Significant heterotic effect over their mid and better parents for ear length, number of kernels per row, 100 kernels weight and grain yield per plant. Line 1 (Mv 0.9) proved to be a good general combiner for earliness, ear height, ear diameter, number of rows per ear and grain yield per plant. Whereas, line 2 (Mo 17) was the best general combiner for tallness, ear length, number of grain/row and gr<Jin yield/plant. Tester 2 (Composite 45) was found to be a good general combiner for tallness and most of yield component trcits, The results showed that the magnitudes of additive genetic variance were positive and lower than those of non additive genetiC variances for 50% silking, plant height and yield and its components. This fact could be verified by the dominance degree ratio, which was more than one for all traits, indicating that over dominance played a major role in the inheritance- of these traits. The promising top crosses, which resulted from exotic lines and local tester exhibited desirable specific combining ability (SeA) effects and high heterotic values. Therefore, these superior crosses offer a good chance for possibility of improving yellow maize in Egypt | ||
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