Estimation of genetic variability and heritability for yield and its related components in cassava (Manihot esculenta Crantz) genotypes.

Abstract

Seventy seven cassava genotypes along with three check varieties were employed for assessment of genetic variability, heritability and genetic gain during the period from 2015 to 2016 at, Horticultural Research Station, Dr. Y.S.R. Horticultural University, Venkataramannagudem, Andhra Pradesh under All India Co-ordinated research Project on Tuber crops. Analysis of variance revealed significant differences between genotypes for sixteen quantitative characters. Higher magnitude of PCV and GCV were observed for total leaf area, number of leaves per plant, HCN content, post-harvest physiological deterioration and tuber yield per hectare indicating the existence of wide range of genetic variability in the germplasm for these traits. High heritability estimates coupled with high estimates from genetic gain as per cent of means were observed for number of leaves per plant, plant height, HCN content and moderate heritability estimates coupled with high estimates from genetic gain as per cent of means were observed for petiole length, tuber dry matter content, tuber length, post-harvest physiological deterioration and tuber yield per hectare indicated that these characters were least influenced by the environmental effects and these characters were governed by additive genes and selection will be rewarding for improvement of such traits.