TYPE GENE ESTIMATION ACTION FOR GRAIN YIELD IN SOME NEW WHITE MAIZE (Zea mays L.) INBRED LINE USING TOP CROSS. | ||
| Journal of Plant Production | ||
| Article 1, Volume 5, Issue 2, February 2014, Pages 183-192 PDF (480.89 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpp.2014.53501 | ||
| Author | ||
| M. M. A. Osman* | ||
| Maize Res. Section, Field Crops Res. Inst. Agric. Res. Canter, Egypt. | ||
| Abstract | ||
| Twenty five white maize inbred lines were topcrossed to each of two white line testers, i.e. Sd 7 and Sd 63 in 2011 summer season. The results of 50 topcrosses along with is parents (25 inbred lines and two testers) and two check hybrids, i.e SC 10 and SC 128 were evaluated in 2012 growing season at two locations (Gemmeiza and Mallawy). Results clearly showed that, partition sum of squares due to crosses into its components showed that mean squares due to lines and testers were highly significant for all traits. Non-additive gene effects were more important than additive ones in the inheritance of all traits under combined data and the ratio of (GCA) x L / SCA x L was less than unity for all traits. The tester Sd 7 exhibited highly positive(g^i) for grain yield, while the female Gm. 30, Gm. 35, Gm. 36, Gm. 54 and Gm. 58 had desirable positive and significant (g^i) for grain yield. The crosses (Gm. 30 x Sd.7),(Gm. 36 x Sd.7) and (Gm. 58 x Sd.7) considered the best crosses for grain yield and could be used as good hybrids in maize breeding programs. | ||
| Keywords | ||
| Maize; top cross; Tester; Inbred Lines; Combining ability; Variance | ||
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