Combining Ability Studies for Yield and Yield Components in Rice (Oryza Sativa L.)

Combining Ability Studies for Yield and Yield Components in Rice (Oryza Sativa L.)

In rice, a line x tester analysis with twelve high yielding genotypes viz., ADT 39, ADT 42, ADT 43, ADT (R) 45, ADT (R) 46, ADT (R) 47, TNAU Rice ADT 49, CO 47, ASD 16, TKM 11, TKM 12 and TRY 2 and five testers viz., Pusa 1460, Imp. Samba Mahsuri, Ajaya, IRBB 60 and IRBB 21 revealed that the ratio of GCA : SCA variances computed for all the six yield and yield component traits showed the predominance of non- additive gene action. Based on gca effects, ADT 43 and ADT (R) 46 were adjudged as the best combiners for five out of six biometrical traits including grain yield per plant. The parents ADT 42, Pusa 1460 and IRBB 60 possessed favourable gca effects for four biometrical traits including grain yield per plant. This was followed by ADT (R) 45, CO 47, ASD 16 and Imp. Samba Mahsuri which were considered as the next best general combiners since they exhibited desirable gca effects for three characters including hundred grain weight. ADT (R) 46/Pusa 1460 for grain yield per plant of the present study revealed the highest sca effect represent dominance and epistatic components of variation..