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 |
The ANOVA revealed significant differences among the six cross families for all the characters in E1 and E2 except for ATR in E2. Differences among the progenies within families were also significant for all the characters in the six crosses in E1 and E2. Simple scaling tests indicated presence of epistatic gene interactions and fitness of digenic interaction model for all the characters in most of the six crosses in both conditions. Across the six crosses, role of epistasis was comparatively more pronounced in E2 as compared to E1. The generation mean analysis revealed importance of additive (d) and/or dominance (h) gene effects as well as one or more of the epistatic gene interactions (i, j, l) for all the characters in most of the crosses in E1 and E2. However, nature and magnitude of gene effects and epistatic interactions for a character exhibited considerable variation across the six crosses and both conditions. The significance of additive gene effects for most of the sixteen characters in the six crosses under two conditions suggested substantial improvement in yield status can still be achieved in rice by using breeding procedures exploiting fixable components of genetic variance leading to development of pure-line varieties in rice for irrigated and drought condition. Significance of dominance gene effects and epistatic interactions for most of the traits in six crosses under two conditions indicated that exploitation of heterosis through hybrid varieties appears to be a potential alternative. The non-additive gene effects may also be utilized for facilitating development of pure-line cultivars by involving population improvement methods.
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