Assessment of Genetic Potential for Submergence Tolerance in indica Rice (Oryza sativa L.)
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Date
2016-07
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Department of Plant Breeding and Genetics, BAU, Sabour
Abstract
28 diverse rice genotypes including indigenous and exotic collections were screened for submergence tolerance at Research Farm of BAC, Sabour during Kharif 2015 with the help of morphological, biochemical and molecular studies aiming to reveal the effect of submergence on various morphological traits. It was also tried to know if the submergence tolerance, if any available, is due to SUB1 or there was any other gene responsible. The field trial was conducted with the same set of genotypes in control and submergence conditions simultaneously. One of the field trial was submerged completely at 30 DAT and remained submerged continuously for 18 days. Pre and post harvest data was collected for several important traits. Survival % was calculated in submergence experiment at 21st day of de-submergence. In biochemical study, ADH enzyme activity was analyzed while to work out allelic diversity, SSR primers were used. Gene specific primers for SUB1 were also used to confirm the presence of this QTL in the genotypes under study. Morphological data was subjected to statistical analysis for genetic variability, heritability, genetic advance, correlation coefficient, path analysis, and genetic diversity. Most of the yield contributing traits was drastically affected by the submergence. ADH was found to having a vital role for submergence tolerance in rice. Submergence tolerant genotypes, in general, has medium plant height and have no elongation ability during submergence due to which they show a better and balanced assimilation and consumption of carbohydrate. Out of 28 genotypes studied, three genotypes namely RYC-743, Purnendu, and IR 96321-315-402-B-1 can further be used as submergence tolerant genotypes.
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