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 |
Information regarding genetic variation for drought attributes, their heritability and genetic advance coupled with association of different component traits among themselves and with grain yield are of immense help to breeder for selection of parents in hybridization programme. Phenotypic variation does not directly indicate its usefulness for selection in order to obtain genetic improvement unless the genetic fraction of variation is known. Therefore, it is important to partition out the genotypic component of total variation to arrive at reliable conclusion about the exploitable (genetic) variability in a set of genotypes. The present investigation was carried out at the Agriculture Research Farm, Institute of Agricultural Sciences, BHU, Varanasi during the kharif-2016 using 20 diverse rice genotypes with the objectives to assess direct selection parameters (variability, heritability and genetic advance). The results of the investigation revealed the high estimates of genotypic coefficient of variation and phenotypic coefficient of variation were observed for traits viz. sterile spikelets per panicle followed by grains yield per plot and grain yield per plant. Low magnitude of GCV and PCV was exhibited by canopy temperature depression followed by chlorophyll content and amylose content, rest other traits exhibited medium values of PCV. Further, high heritability coupled with high expected genetic advance as percent of mean was also observed for the traits viz. panicle weight, grain yield per plant, kernel breadth, kernel L/B ratio, proline content(99%) followed by days to 50% flowering, days to first flowering, panicle length (98%) and 1000grain weight, kernel length (97%). Lowest heritability was observed in canopy temperature depression (24%) followed by chlorophyll content (36%) and stomatal conductance (53%). Other traits showed intermediate heritability.
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