"GENETIC DIVERGENCE AND VARIABILITY ASSESSMENT IN RICE (Oryza sativa L.) UNDER DIRECT SEEDED CONDITION"
Loading...
Date
2021
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
DRPCAU, PUSA
Abstract
Present finding work entitled “GENETIC DIVERGENCE AND VARIABILITY ASSESSMENT IN RICE (Oryza sativa L.) UNDER DIRECT SEEDED CONDITION” at TCA, Dholi, Muzaffarpur, Bihar. Rice (Oryza sativa L., 2n=24) basically a monocotyledonous, short day angiospermic plant which is being placed with genus ‘Oryza’ of Gramineae (Poaceae) family. Rice is a main food of the global level & secure food security so variation known are very important to food security. A experiment is conducted with objectives addressing the different problems and experiment is designed with fifteen different genotypes under direct seeded condition at instructional farm in the year 2020 to 2021 to study on genetic variability with different genetic parameters for fifteen different characters like plants height, days 50% flowering & maturity, panicles length, no. of panicle and tillers/plant, test weight, biological yield/plant, no. of grains/panicles, & yield of grain/plant along with observations on per performance. All of characteristics' mean sums of squares were determined to be very significant, suggesting that there was enough variance among genotypes for all of the features. Studies revealed that genotypes IR-64, Sahabhagi Dhan, IR-154, DRR DHAN-44, IR-127367-107-1-B-B, IR-127335-106-2-2-1-1, IR-127290-B-B-293-1 were found as early flowering. These genotypes can be employed to develop early flowering and utilized in breeding programme. Rajendra Neelam showed high yield per plant under direct seed sowing, can be utilized in high yielding lines. Yield of grains/plant was shown to have a strong positive relationship with the no. of panicles/plant, length of panicle, biological yield, and harvest index, and these variables with high heritability & low GA indicate together non-additive and additive genes action. 15 rice genotypes were framed into four clusters by tocher method, contained 12 genotypes in cluster I, and clusters II, III and IV were monogenic genotype each cluster. Among the clusters, high cluster mean was found for grains yields/plant in cluster I, for longer panicles length in cluster II, for 1000 grain weight in cluster IV. In the future breeding programme, selecting genotypes as parents would be beneficial to components of yield.