Abstract
The nature and magnitude of heterosis and combining ability was studied in 18 F1 hybrids involving three CMS lines and six testers using line × tester analysis. The analysis of variance for combining ability of all the traits showed that variances due to treatments, parents, hybrids were highly significant. The line ‘CRMS 32A’ and testers viz. ‘Super rice-8’, ‘R 1099-2569-1-1’ and ‘Jitpiti’ were identified as good general combiners. The significant differences between lines x testers interaction indicates that SCA attributed heavily in the expression of these traits and demonstrates the importance of dominance or non additive variances for all the traits. The hybrid ‘CRMS 32A’/‘R 1099-2569-1-1’ and ‘APMS 6A’/‘Super rice-8’ were promising for grain yield. The magnitude of relative heterosis, heterobeltiosis and standard heterosis were also estimated for different characters. A high degree of relative heterosis was observed for grain yield (20.45- 82.37%) in the hybrids viz., ‘CRMS 32A’/‘Super rice-8’, ‘APMS 6A’/‘Super rice-8’, ‘APMS 6A’/‘Jitpiti’ and ‘CRMS 32A’/‘R 1099-2569-1-1’. While, a higher degree of: heterobeltiosis (13.60 -68.37%) was observed for grain yield in the hybrids viz., ‘CRMS 32A’/‘Super rice-8’, ‘CRMS 32A’/‘R 1099-2569-1-1’, ‘APMS 6A’/’Super rice-8’ and ‘APMS 6A’/’Jitpiti’. A high degree of standard heterosis was observed for grain yield in the hybrid ‘CRMS 32A’/‘R 1099-2569-1-1’. The hybrid ‘CRMS 32A’/ ‘R 1099-2569-1-1’ recorded a high degree of relative heterosis (62.01%), heterobeltiosis (57.35%) and standard heterosis (15.05 and 25.51% over check hybrids, ‘Mahamaya’ and ‘Indirasona’, respectively) that can be tested on yield trials for its further testing over locations.
Highlights
Rice has been one of the world’s most important food crops, feeding more than half of the world’s population (Khush, 1997)
The experimental material comprised of three CMS lines (‘APMS 6A’, ‘CRMS 32A’ and ‘PUSA 6A’) used as females and six testers (‘SR-6-SW-8-1’, ‘R 1099-2569-1-1’, ‘R-1557-13061-568-1’, ‘Super rice-7’, ‘Jitpiti’ and ‘Super rice-8’) used as males and resulting 18 F1 hybrids obtained from line × tester mating design
General and specific combining ability The analysis of variance for combining ability of all the traits under study is presented in the Tab. 1, which showed that variances due to treatments, parents, hybrids were highly significant for all the characters
Summary
Rice has been one of the world’s most important food crops, feeding more than half of the world’s population (Khush, 1997). Knowledge of Combining ability and heterosis helps in the selection of appropriate parents for a hybridization programme for evolving elite segregants with high grain yield in the segregating generations. General and specific combining ability The analysis of variance for combining ability of all the traits under study is presented in the Tab. 1, which showed that variances due to treatments (parents+ crosses), parents, hybrids were highly significant for all the characters.
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