Articles

Genetic variability, repeatability, traits relationships and path coefficient analysis in low nitrogen donor white inbred lines of maize (Zea mays L)


Abstract


Genetic variability of agronomic traits of crops broadens the gene pool of crops. Repeatability and genetic ad- vance determine the effectiveness of selection in breeding programme. Hence, phenotypic and genotypic vari- ances, genotypic coefficient of variation, repeatability and expected genetic advance were estimated for three flowering and six morphological traits of white kernel low nitrogen donor maize inbred lines. Significant difference existed in the nine traits. Genotypic and phenotypic variances were equal for floral traits. Thus, gene actions for the traits was additive. Repeatability was high for the nine traits. In addition to high repeatability, anthesis-silking interval showed high genetic advance with high coefficient of variation suggesting its efficiency for selection. Phenotypic and genotypic correlations of grain yield with each of days to anthesis, plant height, ear height, leaf area and number of ear per plant were positive and significant. Genetic effect for grain yield correlated with that of days to silking, but this was not for phenotypic effect. Any of these traits can be selected for grain yield and the lines studied were considered suitable as gene pool in maize breeding for nitrogen stress tolerance. Path analysis showed that days to silking, leaf area and ear per plant had high positive effect with grain yield of the crop.

Keywords

correlation, genotype, genetic advance, heritability, path analysis, phenotype

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