Studies on genetic variability for floral and grain quality traits in rice (Oryza sativa L.)

Abstract

Genetic variability, heritability and genetic advance were estimated for various floral and grain quality traits in 22 genotypes of rice. The experiment was conducted in randomized block design with two replications during at Vanavarayar Institute of Agriculture, Pollachi during 2014-15. Analysis of variance showed significant differences among the genotypes studied for all the floral and grain quality traits. The phenotypic coefficients of variations were higher than those of genotypic coefficients of variations, which indicate the influence of environment for expression of the characters. The genotypic and phenotypic coefficient of variations (PCV and GCV) was maximum for stigma exsertion and minimum for hulling per cent. Floral traits anther length, anther breadth, number of pollen grains per anther, panicle exsertion, stigma length, stigma breadth, stigma exsertion and style length and grain quality traits like kernel length, kernel breadth, kernel length/ breadth ratio, kernel length after cooking, kernel breadth after cooking and volume expansion ratio exhibited higher magnitude of broad sense heritability accompanied with high genetic advance as per cent of mean, indicating the predominance of additive gene action governing these traits and genetic improvement for these traits is possible by using simple selection techniques.

Keywords

• genotypic coefficient of variation
• phenotypic coefficient of variation
• heritability and genetic advance