Genetic Variability, Character Association and Path Analysis Study in Sweet Potato [Ipomoea batatas (L.) Lam.]
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Date
2020-07-16
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Agriculture University, Jodhpur
Abstract
A field experiment on “Genetic Variability, Character Association and Path
Analysis Study in Sweet Potato [Ipomoea batatas (L.) Lam.]” was carried out during
Kharif, 2019 at Agricultural Research Station, Mandor-Jodhpur (Rajasthan). The
experiment was laid out in Randomized Block Design with 16 genotypes and three
replications to estimate the extent of genetic variability, heritability, genetic advance,
the correlation between yield and other characters, the direct and indirect effect of
yield contributing traits through path analysis.
Analysis of variance exhibited significant differences for all the characters
suggested the presence of great inherent genetic variations among the genotypes. The
phenotypic coefficient of variation was slightly higher than the respective genotypic
coefficient of variation for all the characters under study.
High estimates of heritability and genetic advance as per cent of mean were
observed for the characters viz., β-carotene followed by marketable tuber yield per ha,
tuber yield per plot, tuber length, TSS, number of marketable tuber per plot, tuber
yield per ha, tuber yield per plant, leaf width, tuber diameter, fresh weight of tuber,
inter-nodal length, starch content, leaf length and vine length. Moderate heritability
was observed for number of tubers per plant and number of marketable tubers plant.
Correlation studies among the characters studied revealed that tuber yield per
plant has a strong positive significant association with characters like the fresh weight
of tuber, number of tuber per plant, starch content, tuber diameter, leaf width, leaf
length, inter-nodal length, vine length and tuber length.
Path coefficient analysis of various quantitative characters indicated that fresh
weight of tuber, number of tuber per plant, tuber length, leaf width, leaf length and
tuber diameter exhibited a positive direct effect on tuber yield per plant while, vine
length and inter-nodal length exhibited the maximum negative direct effect on tuber
yield per plant.
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Devkaran 2020. Genetic Variability, Character Association and Path Analysis Study in Sweet Potato [Ipomoea batatas (L.) Lam. M.Sc. thesis, College of Agriculture, Agriculture University, Jodhpur.