Genetic analysis of quantitative traits in muskmelon (Cucumis melo L.)
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Date
2020
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Department of Horticulture Institute of Agricultural Sciences Banaras Hindu University Varanasi
Abstract
An investigation entitled “Genetic analysis of quantitative traits in muskmelon (Cucumis melo L.)” was carried out at Vegetables Research Farm of Department of Horticulture, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi, during summer season (Zaid season), 2019. The experiment was performed in a randomized block design (RBD) with 26 genotypes which are replicated thrice to estimate the range of genetic variability, heritability, genetic advancement, correlation between yield and other characters, direct and indirect effects of the yield through path coefficient analysis and genetic divergence through D2 statistics. ANOVA demonstrated the presence of significant differences among genotypes for all the characters studied. GCV values were lower than PCV for all characters. Among the characters, fruit yield per plant (g) revealed the highest PCV and GCV values. High estimates of heritability were obtained for almost all the characters except for leaf blade length, total number of 1° branches and pulp to seed ratio. Whereas, high heritability coupled with high GAM were reported fortraits viz., fruit yield per plant (g), total number of female flowers, node to first female flower, total number of fruits, fruit weight, and TSS. Phenotypic and genotypic correlations between fruit yield plant-1 and different yield attributing characters showed that estimates of GCC were higher than PCC, and fruit yield plant-1 was having highly positive and significant correlation with traits viz., days to 1st female flower, total number of female flowers and fruits per plant, and titratable acidity. Path coefficient analysis showed a substantial positive and direct effect at both genotypic and phenotypic levels on fruit yield plant-1 through fruit weight, total number of female flowers, pulp weight, days to first male flower, cavity width, total number of primary branches, ascorbic acid content, phenol content, node to first female flower, and days to first fruit harvest.Based on the relative magnitude of D2 values, altogether twelve clusters were
formed. Of the twelve clusters, cluster 1 was largest with the nine genotypes, followed by 3rd cluster with seven genotypes. Among the traits studied, maximum genetic divergence was contributed by the character index seed weight. The maximum inter-cluster distance was recorded between cluster 8th and 11th while, the intra-cluster distance was highest in cluster 3.
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Genetic divergence