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 |
A study was undertaken to study the extent of variability and genetic parameters with seven parents and 21 crosses for seven traits in rice. Higher estimates of GCV and PCV were recorded for pollen fertility (%) and grain yield per plant suggested that these traits can be improved through simple selection. High heritability coupled with high genetic advance was observed for plant height, pollen fertility (%), panicle length, number of filled grains per panicle and grain yield per plant and it reveals the preponderance of additive gene action. Selection is effective based on phenotypic values for further improvement of these traits. The significant estimates of genetic component of variation due to additive (D) and dominant components (H1 and H2), reveals the importance of both additive and dominant genes for the traits studied. Positive value of ‘F’ exhibited greater proportion of dominant alleles for all the traits and it indicates the asymmetric gene distribution. Mean degree of dominance (H1/D)1/2 was found to be more than unity for all the traits which reveals the presence of over dominance. The higher proportion of dominant alleles in parents was evident from the positive value of ‘F’ for all the traits studied except for grain yield per plant. The traits, days to 50 % flowering, plant height, pollen fertility (%), panicle length, number of filled grains per panicle and grain yield per plant were controlled by additive gene action, which could be improved through simple selection methods.
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