Author(s):

Rahul Singh, Mankesh Kumar, SP Singh, Dharamsheela Thakur, Sweta Sinha, Anand Kumar, Amit Kumar Mishra and Satyendra

Abstract: 28 rice genotype of different origin were evaluated simultaneously under normal and artificially submerged conditions in Randomised Block Design with three replications to assess their genetic variability. Morphological data on yield and other important traits was collected and analysed for the control and submergence trial, respectively. The combined analysis of variance revealed statistically significant differences (p<0.01) for all the traits in both the conditions except number of unfilled grains/panicle which was found to be significant at p<0.05 indicating the presence of genetic variability among the genotypes. Grain yield was found to be ranging from 3116 kg^-1 (RYC-250) to 6033 kg^-1 (Rajendra Mahsuri^-1) under normal and 413 kg^-1 (Sabour Deep) to 4244 kg^-1 (RYC-743) under submergence. A higher value of phenotypic and genotypic coefficient of variations (GCV and PCV) was recorded for panicle weight under both the conditions. The highest heritability (broad sense) was recorded for days to 50 % flowering (98.68%) under control condition while for panicle weight (98.01) under submergence. High heritability coupled with high GCV and high genetic advance as percentage of mean were exhibited for panicle weight under both, control and submergence while for plant height at maturity and grain yield respectively under control and submergence.

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