“GENETIC VARIABILITY, CORRELATIONS AND PATH ANALYSIS IN SWEET POTATO [Ipomoea batatas (L.) Lam.]”
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Date
2003
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Indira Gandhi Krishi Vishwavidyalaya Raipur
Abstract
The present investigation was carried out at Horticultural Research Farm, IGAU, Raipur (C.G.). The experimental material consisted of 24genotypes of sweet potato which were replicated three times in a randomized block design during Rabi 2002-2003. The data of 16 characters were recorded and analysed to workout the variability, heritability, genetic advance, correlation and path analysis for vine length, vine weight per plant, number of tuber per plant, number of marketable tuber per plant, neck length of tuber, tuber length, tuber diameter, biological yield per plant, tuber yield per plant, marketable tuber yield per plant, tuber yield tonnes per hectare, marketable tuber yield tonnes per hectare, harvest index, total soluble solids, dry matter per cent of foliage and dry matter per cent of tuber. Analysis of variance revealed that the mean sum of squares due to genotypes were significant for all the characters (except number of marketable tuber per plant). Estimates of genetic parameters for various characters revealed that relative magnitude of genotypic coefficient of variation in general, was higher for vine length followed by neck length of tuber, vine weight per plant, marketable tuber yield per plant, total soluble solids and harvest index. Heritability estimates in general were high for most of the traits showing preponderance of additive genetic variance. High heritability coupled with high genetic advance as percentage of mean was in general, high for vine length, vine weight per plant, tuber yield per plant and biological yield per plant indicated that direct selection for these characters is very effective. Correlation coefficient analysis revealed that tuber yield tonnes per hectare had positive significant correlation with biological yield per plant, tuber diameter and harvest index, suggesting that indirect selection for these characters may increase the tuber yield of sweet potato traits. Path coefficient analysis revealed vine weight per plant, number of marketable tuber per plant and tuber yield per plant were important traits influencing tuber yield and could be utilized as selection criteria in sweet potato improvement programme for Chhattisgarh plains.
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77 p.