ESTIMATES OF GENETIC PARAMETERS, COMPONENTS OF VARIANCE AND THEIR MAGNITUDE IN RICE (ORYZA SATIVA L.)
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Date
2019
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Plant Archives
Abstract
The relative contribution of males x females was higher than that of males and females for the expression of all the characters
except total number of spikelets and number of fertile spikelets. Males exhibited maximum contribution for ear bearing tillers
plant-1. In general, phenotypic coefficient of variation was higher than genotypic coefficient of variation for all the characters.
Phenotypic and genotypic variations were lower for days to 50% flowering, plant height, days to maturity, ear bearing tillers
plant-1 and total number of spikelets plant-1, indicating little opportunity of selection for these characters. Other characters showed
more variation among phenotypic and genotypic values. Heritability in narrow sense (h2n) ranged from 5.18 for days to maturity
to 20.27 for ear bearing tillers plant-1. Highest h2n estimate was recorded for ear bearing tillers plant-1. Moderate h2n estimates
were observed for remaining traits except days to 50% flowering, biological yield, harvest index, plant height and days to
maturity which, were of lesser order. Estimates of h2b were recorded high for all the characters except days to maturity.
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