[1]
El-Badawy Osama, Rice Research and Training Center (RRTC), Field Crop Research Institute, ARC, Kafr El-Sheikh, Egypt.
[2]
Hamdy El-Mowafi, Rice Research and Training Center (RRTC), Field Crop Research Institute, ARC, Kafr El-Sheikh, Egypt.
[3]
Ashraf Abd El-Hadi, Genetics Department, Faculty of Agriculture, Mansoura University, Mansoura, Egypt.
The present study was conducted to realize the feasibility of genetic behavior using three line systems in hybrid rice. The experiment was carried out during 2012 and 2013 growing seasons at Rice Research and Training Center (RRTC) Farm, Sakha, Kafr El-Sheikh, Egypt by line × tester mating design. Twenty four F1 hybrids obtained from crossing four cytoplasmic male sterile (CMS) lines as females with six restorer lines were evaluated along with the parents for genotypic variation. Analysis of variance revealed highly significant differences among treatments, parents, parents vs. crosses for studied traits while variance among females (lines) were highly significant for all traits except 1000-grain weight. The variances among crosses due to males and females (lines × testers) interaction component, indicating their specific combining ability (SCA) effects were highly significant for all the traits. The value of variance of general combining ability (σ²GCA) was less than variance of specific combining ability (σ²SCA) for all traits showing preponderance of non-additive gene action. It was supported by ratio (σ²GCA/σ²SCA) being less than one for all studied traits, indicating that the non-additive type of gene action played a major role in the inheritance of these traits. Two parental lines viz., PR2 and PR78 were identified as good general combiners for yield (t/fed.). Only one hybrid combination, Pusa6A×Giza178R showed highly significant positive SCA effects for yield (t/fed.). Regarding the grain yield, the results gave highly significant correlation coefficient between yield and panicle weight, No. of filled grains panicle-1 and No. of spikelets panicle-1.
Hybrid Rice, Genetic Analysis, Cytoplasmic Male Sterile Lines
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