Combining ability studies for lodging resistance and yield traits in rice

General and specifc combining ability effects of parents and hybrids were studied for lodging resistance and for yield in rice. Twelve F₁ hybrids were developed by crossing four lines (lodging genotypes) with three testers (lodging resistant) in the L x T pattern. The analysis of variance was highly signifcant, indicating the genetic diversity of parents and the importance of both additive and non-additive gene actions in the inheritance of traits investigated. Signifcant sca effects for diferent traits indicated a preponderance of non-additive gene action. Among parents, lines viz., Ponmani, Uma and Gouri were found to be good combiner for grain yield per plant and lodging resistance. Among the hybrids viz., Ponmani x Uma, Prathyasha x Pournami and Prathyasha x Gouri were the best cross combinations. Thus, specifc parents and crosses can be used effectively in crop improvement programs.