Studies on Choice of Parents and Gene Action in Rice Hybrids Involving Yield and Physiological Traits Under Aerobic Condition

Combining ability and heterosis was studied in 21 parents and 90 hybrids for yield and physiological traits under aerobic condition. Analysis of variance was highly significant for all the characters and predominantly controlled by non additive gene action. IR79128A (L₁), IR79156A (L₂), IR70369A (L₄), IR7925A-428-2-1-1R (T₁₁), KMP-148 (T₁₂) and BI33 (T₁₅) were adjudged as the best combiners for most of the yield contributing characters. The hybrids IR70369A/IR 7925A-428-2-1-1R, IR 79128A/BR 2655, IR70369A/KMP-105 and IR 79128A/KMP 149 were found to have specific combiners for most of the yield contributing and drought tolerant traits including single plant yield.