Heterosis for Grain Yield and Its Related Traits in Rice (Oryza sativa L.) under Submergence Condition

The heterosis study on grain yield and its components from line x tester analysis from 30 F1 hybrids derived from 10 female and 3 male lines. The observations were recorded on 11 quantitative traits. Analysis of variance revealed that all the treatments exhibited highly significant variation for all the traits. The result revealed that grain yield and its component showed highly significant differences for all the traits. Among the 30 hybrids, six hybrids Sarjoo-52/Swarna Sub 1, Sarjoo 52/NDR 98030135, IR-64/Swarna Sub1, IR64/NDR 98030144, NDR-359/Swarna Sub 1, and NDR-359/NDR-9803011 showed significant heterosis for grain yield and nine hybrids showed significant negative heterosis. These hybrids may be exploited for heterosis breeding and should be screened for yield stability during submergence.