Studies on Genetic variability, Heritability and Genetic advance in Rice (Oryza sativa L.)

摘要

Seventy genotypes of rice (Oryza sativa L.) were evaluated for grain yield, yield components and quality traits during Kharif2012 at College farm, Agricultural College, Naira, Srikakulam. The study revealed considerable genetic variability among the genotypes for all the traits. Genotypic and phenotypic coefficients of variation were more or less similar for all the characters. Phenotypic and genotypic coefficients of variation were high for grain yield per plant. High heritability coupled with highexpected genetic advance was observed for grain yield per plant, number of grains per panicle, number of effective tillers per plant, plant height, 1000-grain weight, kernel breadth and length breadth ratio revealed the preponderance of additive gene effects in the expression of these traits. High estimate of heritability with low to moderate genetic advance observed for panicle length, days to 50 per cent flowering and kernel length on the other hand revealed the importance of dominance and epistatic effects in the inheritance of these traits.