COMbiNING ABILITY AND TYPE OF GENE ACTION FOR GRAlN YIELD AND IT'S COMPONENTS AND RESISTANCE TO DeWNY MILDEW DISEASE IN MAIZE | ||||
| Journal of Plant Production | ||||
| Article 1, Volume 28, Issue 10, October 2003, Page 7095-7105 PDF (3.37 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2003.245237 | ||||
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| Author | ||||
| A. A. EI-Shenawy, | ||||
| Field traps Research Institute ,Agric .Res .Center | ||||
| Abstract | ||||
| Nine inbred lines of yellow maize were mated to three testers in 2001 growing season . Parents and their top-crosses were evaluated at Sakha, Sids and Nubaria locations in 2002 growing season. Combining ability analysis was calculated by the line x tester analysis according to Kempthorne (1957). Mean squares due to location (Loc), genotypes (G), parents (P), crossess (C) and (P vs C) and their interactions with locations were significant for all studied traits excep~ (G x Loc) , (P x Loc.) and (C x Loc)were not significant for all studied traits except grain yield (ard/fad). Also mean squares of crosses and their partitions ( L), (T) and ( txT) were significant for all traits except (T) for ear diameter and ( L x T) for plant ~nd ear height and ear diameter. The best inbred lines had desirable significant GCA effect for grain yield were SK-70 O,SK-7078/2 and SK-7078/1. Eight single crosses as top-crosses produced more grain yield than checks single cross 155 (23.8 ard/fad) , among them three crosses. i.e. SK-7070 x L 121 (31.3 ~rd/fad), SK-7078 x L 121 (27.1 ard/fad) and SK-7017/4 x L 121 (25.8 ard/fad) had si~nificant by more yield than check SC155, Also, six three way crosses as top- crosses yielded more than the check TWC 352 (20.8 ard/fad) from these crosses two crosses, SC SK-22 x SK-7070 (26.1 ard/fad and SC SK-22 x SK-7078/30 (23.99 ard/fa~) produced significantly by more than the check TWC352. ~ hese materials can be used to improve yellow maize and are very useful in maize breeding program. I he inbred lines SK-7017/4, SK-7017/10 and 7017/2-4 exhibited the highest positive significant GCA effects for resistance to downy mildew disease. These inbred lines could be used in breeding program. The top-crosses line 121 x SK-7078/1 and SC SK-21 x Gm-1004 had significantly positive SCA effects for resistance to downy milde-.y disease. However GCAISCA ratio was less than unity (0.21) for resistance to downy mildew disease, indicating that a non-additive effect was more important in inheritance of this trait. | ||||
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