Evaluation of Morphological Variations in Exotic Rice (Oryza Sativa L.) Genetic Materials under Sri Lankan Field Conditions
Keywords:Rice, Germplasm, Cluster analysis, Genetic diversity
To evaluate genetic diversity of 64 rice germplasms with five local check varieties, an experiment was conducted as the randomized complete block design with two replicates. It was conducted in experimental field of the Regional Rice Research and Development Center, Bombuwela, Sri Lanka. There were five morphological characters such as plant height, days to flowering, days to maturity, grain yield and the phenotypic acceptability of varieties were evaluated. As the results analysis of variance showed there is a significant difference among genotypes of all the tested characters. A total of four clusters were defined through cluster analysis and the distinct genetic variations were observed among the clusters. Cluster i consisted of six genotypes, cluster ii of 38, cluster iii of 19 and in cluster iv of one genotype were separated. Cluster groupings of local rice varieties into three main groups from three different rice breeding stations such as Bombuwela (Bw), Ambalantota (At) and Batalagoda (Bg) resemble their distance in genetic diversity as well as close genetic parental materials used in developing rice varieties within a cluster. Subsequent analysis of five tested variables confirms significant (p < 0.01) positive correlation (r = 0.61) between plant height and yield among the tested rice varieties. Depending on the breeding objectives the results of multivariate analysis can be applied for the rice varietal improvement program
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Copyright (c) 2022 W.D.P. Weerasinghe，N.T. Prathapasinghe，G.D.A. Priyantha
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