Evaluation Of Recombinant Inbred Lines Derived From Bulk Population Method Of Selection In Rice ( Oryza sativa L.)
Volume 2 - Issue 3, March 2018 Edition
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Myint Aye, May Zin Win, Tin Nwe Win, Nyo Mar Htwe, Nang Hseng Hom
RILs, heritability, genetic advance, correlation, cluster
Current climate shocks in Myanmar reduce the rice productivity and production stability that already have high levels of food insecurity. To attend local self-sufficiency, plant breeders have to develop high yielding cultivars with desirable agronomic traits. In order to evaluate genetic variability of recombinant inbred lines based on agro-morphological traits and also determine the correlation between these traits, 49 F7 recombinant inbred lines (RILs), their parents and a check variety were grown in the research field of Yezin Agricultural University during January to May, 2016. A field experiment was conducted using Randomized Complete Block design with three replications. All tested genotypes showed wide range of variability for population uniformity, flag leaf altitude and leaf pubescence. YAU 1215-B-B-B-138-3, YAU 1215-B-B-B-123-3 and YAU 1215-B-B-B-91-3 were identified as the early maturity promising lines. The best yields were shown in YAU 1214-B-B-B-51-2 and YAU 1215-B-B-B-156-1. Phenotypic coefficients of variance were higher than genotypic coefficients of variance in all the characters. Progeny selection will be effective to improve plant height, total grains plant-1, no. of filled grains panicle-1 and 1000 seed weight indicating high heritability and high genetic advance. In rice seed production, panicle length, number of total grains panicle-1 and number of filled grains panicle-1 were found to be the main yield contributing traits. In cluster analysis, 2 RILs in cluster VI had medium number of panicle plant-1, longest panicle length, largest number of total grains plant-1, medium 1000 seed weight and highest seed yield were identified as highly valuable sources to be incorporated in rice breeding programs.
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