Studies on Gene Action Involved in the Inheritance of Various Characters in Rice (Oryza sativa L.) Under Sodicity Tolerance

The present investigation was based on evaluation of a line × tester set of 60 hybrids (F1s) and their 20 parents along with two checks (Narendra Usar 2009 and IR 28) for thirteen characters. In general, PCV were higher than the GCV for all characters under sodic soil. Nine traits emerged as most important associates of grain yield per plant under sodic soil. The mean square due to lines representing additive effects and g.c.a are significant for all characters. For grain yield per plant, lines NDRK 50057, Narendra Usar 2009, CSR 36, NDRK 50037, IRRI 123, NDRK 50036, NDRK 50045, NDRK 50055 and NDRK 50063 and testers, Jaya and Sarjoo 52 were identified as good general combiners in sodic soil for Grain yield per plant and several other important traits to emerge as valuable parents for hybridization programme for obtaining High yielding pure line/hybrid varieties. The most desirable crosses show showing high mean performance and high and significant heterosis of positive Nature one or both types for grain yield per plant as well as sum of its components traits where CSR 36 X Jaya, Narendra usar 209 X sarjoo 52, CSR 36 X 252, NDRK 50057 X Saju 52, NDRK 50057 X Jaya, NDRK 50057 Narendra 5026, IRRI 123 X jaya, NDRK 50037 X jaya, NDRK 50055 x sarjoo52 and NDRK 50037 x Narendra 5026 under sodic soil. The genetic variability is subjected to selection to isolate superior genotypes. The success of breeding program depends on the variability of the initial material.