Divergence analysis for agro-morphological and quality traits in advanced breeding lines of rice (Oryza sativa L.)
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Date
2021-12
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Sher-e-Kashmir University of Agricultural Sciences and Technology of Jammu
Abstract
Present study entitled “Divergence analysis for agro-morphological and quality traits in advanced breeding lines of rice (Oryza sativa L.)” was carried out during Kharif season 2020 at the Experimental Area of Division of Plant Breeding and Genetics to ascertain the nature and extent of genetic divergence among advanced breeding lines of rice. Twenty seven advanced breeding lines of rice were evaluated in Randomized Complete Block Design (RCBD) in three replications having a plot size of 5m2 in each replication viz., 5 rows of 5m length with row to row and plant to plant spacing of 20 x 15 cm. 25-days old seedlings were transplanted and all the recommended package and practices as well as interculture operations were followed to raise a good crop.
Data recorded on various agro-morphological and quality traits were statistically analysed and analysis of variance revealed significant variation among advanced breeding lines for all the traits studied. Based on the magnitude of D2 values these lines were classified into six non-overlapping clusters. Among these clusters I and II were found to be the largest ones comprising of fourteen and nine advanced breeding lines respectively, whereas, clusters III, IV, V, VI were found to be the smallest ones comprising of single line only. Maximum intra cluster distance was observed in cluster II thereby indicating wider genetic divergence among the lines present in this cluster. Grain yield,1000 grain weight, days to maturity and panicle length were found to have maximum contribution towards genetic divergence. Maximum inter cluster distance was recorded between clusters II and VI followed by II and V indicating the presence of wide genetic diversity between these clusters. Cluster II was reported to have genotypes with maximum cluster mean for traits like plant height, total number of tillers per plant, number of effective tillers per plant and grain yield per plant indicating its superiority over the rest of the clusters.
Characters like plant height, total number of tillers per plant, number of effective tillers per plant, panicle length, and grain yield were reported to have high heritability coupled with high genetic advance indicating their efficient inheritance from generation to generation. Correlation studies revealed a significant positive association of grain yield per plant with tillers per plant, number of effective tillers per plant,1000 grain weight, panicle length and days to maturity suggesting their role in indirect selection for grain yield. Selection of divergent advanced breeding lines from clusters II, VI and V would produce a broad spectrum variation and can be used as parents in hybrizidation programme.
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Preferred for your work= Khanday, D.M.2021. Divergence analysis for agro-morphological and quality traits in advanced breeding lines of rice (Oryza sativa L.). MSc. Thesis SKUAST Jammu.