SECTION A: AGRICULTURAL AND HOME SCIENCES
GENETIC VARIABILITY, HERITABILITY AND GENETIC ADVANCE IN F8 ADVANCED BREEDING LINES OF GROUNDNUT (Arachis hypogeaea L.).
Genetic variability is a basic requirement for crop improvement as this provides wider scope for selection. The effectiveness of selection is dependent upon the nature, extent and magnitude of genetic variability present in the material and the extent to which it is heritable. The pesent experiment was conducted to study the variability in F8 advanced breeding lines of groundnut across four environments in the savannah ecological zone of Nigeria. Twenty three advanced breeding lines were evaluated using a randomized complete block design during 2012/13 rain season in each zone. Analysis of variance was carried out for all the traits under study using SAS computer software. The results showed highly significant (P <0.10) variation among genotypes, location and genotype x location interaction (GLI) for all traits. Significant GLI suggested that the linear function of additive environmental effects was reflected by the change in ranking order of genotypes under varying environmental conditions. The phenotypic coefficient of variation (PCV) was higher than genotypic coefficient of variation (GCV) for all the traits studied, which suggested the presence of environmental influence to some degree in the phenotypic expression of the traits. Pod weight per plant had the highest PCV (24.88%) and GCV (22.85 %). The estimates of broad sense heritability (H2) were observed to be high (63.26-84.33) for all the traits. High heritability estimate coupled with higher genetic advance (37.25) for pod weight per plant indicating that the character is controlled by additive genes and therefore further improvement is possible through selection.
Keywords: PCV, GCV, Heritability and Genetic Advance as percent of mean, Groundnut
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