International Journal of Plant Sciences

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Combining Ability Analysis of Three Line Hybrids in Rice (Oryza sativa L.) under Aerobic Condition


Affiliations
1 Department of Plant Breeding and Genetics, Vanavarayar Institute of Agriculture, Manakkadavu, Pollachi, COIMBATORE (T.N.), India
2 Department of Plant Breeding and Genetics, Agricultural College and Research Institute, MADURAI (T.N.), India
     

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Information on the availability of genetic variability and mode of gene action are critically important for choosing effective breeding methods that result in appreciable improvement in performance under drought stress. An investigation in rice (Oryza sativa L.) was carried out subjecting six 'lines' and 15 'testers' crossed in a line × tester mating design and the 90 hybrids along with 21 parents were tested for gene action, combining ability for 19 traits under aerobic condition. Three 'lines' viz., IR79128A (L1), IR79156A (L2) and IR70369A (L4) and three 'testers' viz., IR7925A-428-2-1-1R (T4), KMP -148 (T12) and BI-33 (T15) were identified as the best general combiners. The genotype IR70369A is suggested for conversion to cytoplasmic male sterility with suitable male sterile source. The parents MAS -26, IR 7925A-428-2-1-1R and KMP-105 are recommended for testing their restorability with suitable CMS source.

Keywords

Additive Genetic Variance (σ2A), Dominance Genetic Variance (σ2D), General Combining Ability Variance/Effects, Specific Combining Ability Variance/Effects, Aerobic Rice.
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  • Combining Ability Analysis of Three Line Hybrids in Rice (Oryza sativa L.) under Aerobic Condition

Abstract Views: 405  |  PDF Views: 1

Authors

R. Sathya
Department of Plant Breeding and Genetics, Vanavarayar Institute of Agriculture, Manakkadavu, Pollachi, COIMBATORE (T.N.), India
S. Jebaraj
Department of Plant Breeding and Genetics, Agricultural College and Research Institute, MADURAI (T.N.), India

Abstract


Information on the availability of genetic variability and mode of gene action are critically important for choosing effective breeding methods that result in appreciable improvement in performance under drought stress. An investigation in rice (Oryza sativa L.) was carried out subjecting six 'lines' and 15 'testers' crossed in a line × tester mating design and the 90 hybrids along with 21 parents were tested for gene action, combining ability for 19 traits under aerobic condition. Three 'lines' viz., IR79128A (L1), IR79156A (L2) and IR70369A (L4) and three 'testers' viz., IR7925A-428-2-1-1R (T4), KMP -148 (T12) and BI-33 (T15) were identified as the best general combiners. The genotype IR70369A is suggested for conversion to cytoplasmic male sterility with suitable male sterile source. The parents MAS -26, IR 7925A-428-2-1-1R and KMP-105 are recommended for testing their restorability with suitable CMS source.

Keywords


Additive Genetic Variance (σ2A), Dominance Genetic Variance (σ2D), General Combining Ability Variance/Effects, Specific Combining Ability Variance/Effects, Aerobic Rice.