Nag, S. K.Yadav, R. K.Kuruwanshi, V. B.Saxena, R. R.Shrivastava, RajeevGeetanjali2020-12-042020-12-042020https://krishikosh.egranth.ac.in/handle/1/5810156311Soybean (Glycine max (L.) Merrill) is commonly known as the “Miracle crop”, which is one of the richest sources of oil and protein. It grows well in different regions of the world, especially in the tropical to the mid temperate zones. It contains proteins about 40 to 42% and oil about 18 to 22%. Being legume it also fixes the atmospheric nitrogen and as the good source of protein it truly claims the title “the meat that grows on plant.”” The present study entitled “Genetic study in Recombinant Inbred Lines population for earliness in soybean (Glycine max (L.) Merrill)” was accomplished during Kharif 2019 “Research cum Instructional farm, Department of Genetics and Plant Breeding, College of Agriculture, IGKV, Raipur, Chhattisgarh (India).” The purpose of present investigation was to generate information about genetic studies for earliness in soybean genotypes. The objective of the study was also to find out the phenotyping for seed yield and its traits, to estimate the association and genetic divergence among traits. The experiment was conducted in Augmented Design in which 150 soybean genotypes excluding three checks was taken for the appraisal of genetic variability, correlation coefficients and cluster analysis. Observations were recorded for 12 traits namely “days to 50% flowering, days to maturity, plant height (cm), number of primary branches per plant, number of pods per plant, pod bearing length(cm), number of seeds per pod, number of seeds per plant, 100 seed weight (gm), oil content (%), protein content (%), seed yield per plant(gm).” “Heritability in Broad sense was calculated for each characters. Number of pods per plant and pod bearing length showed the highest heritability followed by 100 seed weight, number of seeds per pod and oil content, days to maturity, number of branches per plant, number of seeds per plant, plant height showed moderate heritability while, days to 50% flowering, protein content and seed yield per plant showed lowest heritability.” Correlation study showed that number of pods per plant, number of seeds per pod, number of seeds per plant, 100 seed weight, oil content and protein content showed significant and positive correlation with seed yield at genotypic level whereas, some characters like days to 50% flowering and number of primary branches per plant showed negative and significant correlation with seed yield at genotypic” level. This shows that enhancement in one trait will automatically enhance the others. “In cluster analysis all the 148 genotypes are divided into seven cluster, the cluster II was the largest with 82 genotypes, followed by cluster III (29 genotypes), cluster V (12 genotypes), cluster VII (10 genotypes), cluster IV and cluster VI (7 genotypes) and cluster I (1 genotype). From the clustering pattern, it was found that the soybean genotypes were genetically diverse to each other. Hence, the genotypes studied are reliable enough for hybridization and selection.”” “The maximum inter cluster distance was recorded in between cluster IV and cluster II followed by between cluster VI and cluster III and cluster III and cluster I. This suggested that the hybridization programme involving parents from these clusters is expected to give higher frequency of better segregates or desirable combination for development of useful genetic stocks or varieties. The minimum inter cluster distance was observed in between cluster VII and cluster II while the maximum intra cluster distance was observed in cluster III followed by cluster I, cluster V, cluster II, and cluster III. The selection of divergent genotype from above clusters would produce a broad spectrum of variability for morphological and quality traits studied, which enable further for selection and improvement.”EnglishThesis