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The Indian Journal of Genetics and Plant Breeding
Year : 2006, Volume : 66, Issue : 1
First page : ( 6) Last page : ( 9)
Print ISSN : 0019-5200.

Combining ability and heterosis for yield and grain quality in two line rice (Oryza sativa L.) hybrids

Gnanasekaran M., Vivekanandan P., Muthuramu S.

Department of Plant Breeding and Genetics, Agricultural College and Research Institute, Madurai 625 104.

Received:  July,  2005; Revised:  January,  2006; Accepted:  March,  2006.


Thirty two rice (Oryza sativa L.) hybrids involving four TGMS (Thermo Sensitive Gene Male Sterile) lines and eight testers were evaluated for combining ability and heterosis. Among the parents, the TGMS lines viz., GO 98049 and GO 98014, and the testers CB 97033 and IR 72 were the best based on the mean and gea effects. Considering the mean performance, sea effects and standard heterosis, six hybrids viz., GO 98013/CB 97033, GO 98013/CO 47, GO 98014/AOT 45, GO 98014/PMK 2, GO 98049/AOT 39 and GO 98049/CB 97033 were superior for grain yield and kernel quality traits and recommended for further evaluation.


Key words

Rice, gene action, combining ability, heterosis, TGMS.


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