National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Genetic variability and character association for grain yield and its component traits were studied in a set of 90 rice genotypes under rainfed direct seeded condition of Assam. Highest genotypic coefficient of variation was observed for panicle weight, followed by number of primary branches per plant, number of secondary branches per plant and grain yield. Heritability in broad sense was highest for grain weight followed by days to flowering and plant height. High magnitude of heritability, however, was observed for all the traits under study. Panicle weight exhibited highest genetic advance as per cent of mean followed by number of primary branches per plant and number of secondary branches per plant. The scope for further improvement of these traits through selection, thus, was indicated. Correlation studies revealed that grain yield was positively and significantly associated with effective tillers per plant, panicle length, and 100-grain weight. Path analysis also revealed considerable direct effect of these traits. Non-significant association of important yield attributes, viz., number of primary and secondary branches per panicle, panicle weight and filled grains per panicle with grain yield indicated the need of detail analysis of their direct and indirect effects on grain yield. This is due to their negative significant association with effective tillers per plant having the highest positive correlation with grain yield. However, based on their indirect effects via other yield components, the importance of them could be realized. Therefore, breaking these negative associations through appropriate crossing programme may be suggested for further genetic improvement in this group of rice germplasm.
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