Genetic variability, correlation and path analysis for yield, its components and late leaf spot resistance in groundnut (Arachis hypogaea)

摘要

The present investigation was carried out to study the variability parameters, correlations and path coefficients for 13 metric traits in 33 advanced breeding lines and genotypes of groundnut (Arachis hypogaea L.). Significant genotypic differences were observed for all the traits studied indicating the considerable amount of variation among genotypes for each character. The highest genotypic and phenotypic coefficient of variation was observed for late leaf spot (LLS) score at 80 DAS followed by LLSscore at 90 DAS, kernel yield/plant, plant height, pod yield/plant and test weight. Similarly, high heritability coupled with high genetic advance was observed for these traits indicating the scope for their improvement through selection. Kernel yield/plant was positively and significantly correlated with pod yield/plant, shelling per cent, plant height, sound mature kernel per cent and harvest index. The path analysis suggested that pod yield/plant and shelling per cent were the main contributors towards kernel yield/plant. Hence, main emphasis should be given on these traits in breeding programme.