Studies on morphological and molecular divergence in rice
DOI: 10.37992/2023.1404.159
Abstract
Morphological and molecular diversity was studied in a population of 20 rice genotypes, comprising mainly traditional aromatic non-basmati rice. Morphological diversity based on 13 yield traits using D2 statistics and molecular diversity from 17 polymorphic SSR markers resulted in six and five clusters, respectively with minor changes in cluster composition. The D2 values ranged from 17.32 to 2521.56. The highest average intra- and inter-cluster distance (√D2) was 12.3 in Cluster I and 46 between Cluster III and IV. Cluster - I and VI played critical role in inter-cluster distance. Relative contribution of days to flowering to the divergence was highest, followed by secondary panicle branches, panicle exertion and test weight. Molecular analysis revealed 50 alleles with a range of 2 - 4 alleles and PIC values ranging from 0.095 to 0.685 with mean of 0.402. RM390 appeared as the potential marker for polymorphism investigations. Considering genetic divergence, crosses have been suggested for exploitation of heterosis in the F1 generation and isolation of transgressive segregates in advanced segregating generations.
Keywords: Diversity, Morphological, SSR markers, Aromatic rice.
Studies on morphological and molecular divergence in rice
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