STUDIES ON GENETIC DIVERGENCE IN YIELD AND EARLY SEEDLING VIGOUR FOR EARLY DURATION GENOTYPES UNDER DIRECT SEEDED CONDITION OF RICE (Oryza sativa L.)

Loading...
Thumbnail Image
Date
2020
Journal Title
Journal ISSN
Volume Title
Publisher
Indira Gandhi Krishi Vishwavidyalaya, Raipur
Abstract
Rice is the most important cereal of the world providing 21% of global human per capita energy and 15% of per capita protein. Oryza sativa is the major food crop for people in Asia and nearly 90% of the world's rice is produced and consumed in this region.” Chhattisgarh state is renowned by the name Rice Bowl of India because rice is cultivated in maximal land area. The research study was carried out by using eighty rice germplasm “at Research cum Instructional farm of IGKV, Raipur during Kharif” 2019 under direct seeded condition in Randomized Complete Block Design (RCBD), with two replications. Based on grain yield, genotypes namely, R1004-2552-1-1 recorded high grain yield followed by Indira aerobic-1, Asam chidi, Surekha, IR 08 L 152, Pokali and Aditya. The traits showed significant variation. Highest values of PCV and GCV was recorded for number of unfilled spikelet, vigor indexII, seedling dry weight on 30 DAS, seedling dry weight on 20 DAS, number of filled spikelet, grain yield per meter square. Highest heritability were found for seedling length on 20 days, seedling dry weight on 20 days, seedling length on 30 days, seedling dry weight on 30 days, germination%, vigor indexI, vigor indexII, days to 50% flowering,“panicle length, plant height, panicle per meter square, 1000 grain weight,”filled spikelet, unfilled spikelet, spikelet fertility %, “paddy length, paddy breadth, paddy L/B ratio and grain yield. The magnitude of genetic advance as percent of mean was recorded high for” maximum traits except some trait showed moderate genetic advance that was seedling length on 10 days, germination%, “days to 50% flowering, panicle length and flag leaf” width, and also these traits showed low genetic advance viz number of leaves on 10 days, number of leaves on 20 days and number of leaves on 30 days after sowing. “Grain yield per meter square showed positive and significant genotypic correlation with days to 50% flowering, panicle length and number of filled spikelet, likewise days to 50% flowering and number of filled spikelet showed positive phenotypic correlation coefficient for grain yield per meter square. The very high direct and positive effect on yield per meter square” were observed for vigor indexII followed by seedling length on 30 DAS, germination per cent, seedling dry weight on 10 DAS, number of filled spikelet, panicle per meter square, flag leaf width, seedling length on 10 DAS, paddy L/B ratio, paddy width, panicle length, flag leaf length, seedling dry weight on 20 DAS. The highest negative direct effect showed by seedling dry weight on 30 DAS, followed by spikelet fertility per cent, number of unfilled spikelet, number of leaves on 10 DAS, paddy length, “days to 50% flowering, plant height, number of leaf” on 30 DAS. The “PC with higher Eigen values and variables which had high factor loading were considered as best representative of system attributes.”“The PC1 showed 24.51% while, PC2, PC3, PC4, PC5 and PC6 exhibited” 9.68%, 9.32%, 7.51%, 6.79% and 6.24% “variability respectively among the accessions for the traits under study.” Highest 10 principle component scores in each PC revealed that Pokali is the best genotype for early seedling vigor, yield and its contribution characters followed by R1182-31-2-151, Bangoli-3, CG zinc rice-2, Aditya, Gulta 2614, Aganni, Asha, Lal mati and Gurmetta 2697. Spark method of clustering grouped the accessions into seven clusters. “The pattern of constellation proved the existence of significant amount of variability. Cluster IV and VII constituted of 15 accessions, forming the largest cluster. In this cluster have much variability. Cluster VI having a largest number of traits, Birsa gova, Gulta 2614 and Pokali falls under cluster VI. The marker trait associations based on mixed linear model indicated that 18 markers were found to be associated with 23 traits. For grain yield RM 26 (C#6), RM 13 (C#5), RM 225 (C#5), RM 263 (C#2), RM218 (C#3), RM 6091 (C#11), RM 87 (C#5), RM 341 (C#2) and RM 3428 (C#11) exhibited tight association. For number of leaves on 30 DAS were such marker showed tightly linked with RM 26, RM 19 and RM 22. Seedling length on 30 DAS was tightly linked with RM 252, RM 13, RM 21, and RM 225. Seedling dry weight on 30 DAS was tightly linked with RM 252, for germination per cent RM 341 and RM 1339 marker were showed tightly linked. All these traits are related to early seedling vigor. The research provided imperative information for further extraction of these elite genes within rice germplasm and using them for rice breeding. The results have revealed that structures association in one of the sufficient options to recognize major effect quantitie trait loci for early seedling vigor and yield traits in rice.
Description
STUDIES ON GENETIC DIVERGENCE IN YIELD AND EARLY SEEDLING VIGOUR FOR EARLY DURATION GENOTYPES UNDER DIRECT SEEDED CONDITION OF RICE (Oryza sativa L.)
Keywords
Citation
Collections