Diversity Studies in Round Gourd [Praecitrullus fistulosus (Stocks) Pangalo]
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Date
2020-07-16
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Agriculture University, Jodhpur
Abstract
A field experiment entitled “Diversity studies in Round gourd [Praecitrullus
fistulosus (Stocks) Pangalo]” was carried out at the College of Agriculture, Jodhpur
(Rajasthan). The experiment was laid out in Randomized Block Design with three
replications during Kharif 2019 on 20 different genotype of round gourd including
two check cultivars, to estimate the extent of genetic variability, heritability, genetic
advance, correlation among the yield and other attributing traits, direct and indirect
effect of yield contributing traits through path coefficient analysis and genetic
divergence through D2 statistics.
Analysis of variance (ANOVA) exhibited significant differences for all the
studied characters suggesting the presence of great inherent genetic variation amongt
the genotypes. The phenotypic coefficients of variation were slightly higher than the
respective genotypic coefficients of variation for all the characters under study.
High estimates of heritability were noted for almost all the traits except days
taken to 50% female flowering, leaf area and days to anthesis of first female flower.
High heritability and high genetic advance as per cent of mean were observed for the
traits of main vine length at harvest, number of marketable fruits per plant, fruit yield
per plant, fruit yield per hectare, fruit yield per plot, node on which first male flower
appeared, fruit diameter, shelf life and rind thickness, suggesting additive gene action
for expression of these characters. Hence, these characters may prove effective for
selection to improve fruit yield per plant in round gourd.
Correlation studies among the characters revealed that fruit yield per plant had
significant positive association with the characters like number of leaves par plant,
main vine length at harvest, internodal length, leaf area, number of marketable fruits,
fruit diameter, fruit weight, rind thickness and shelf life both at phenotypic and
genotypic levels. Path coefficient analysis of various quantitative characters indicated
that main vine length at harvest, internodal length, days to anthesis of first female
flower, days taken to 50% female flowering, number of marketable fruits per plant,
fruit diameter, fruit weight and rind thickness exhibited positive direct effect on fruit
yield per plant.
Based on the relative magnitude of D2
values, Tocher’s method resulted in
formation of three clusters. Out of the three clusters, cluster I was the largest
comprising of fifteen genotypes followed by II with four genotypes while the cluster
III was monogenotypic, suggesting the existence of high degree of heterogeneity
between the genotypes. The trait of fruit shelf life contributed the maximum towards
genetic divergence. The highest intra-cluster distance was recorded in the cluster II,
while the inter-cluster distance was the highest between cluster I and II, followed by
cluster II and III, indicating that superior recombinants could be obtained by mating
between genotypes of these clusters.
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Citation
Kumar Sunil 2020. Diversity Studies in Round Gourd [Praecitrullus fistulosus (Stocks) Pangalo]. M.Sc. thesis, College of Agriculture, Agriculture University, Jodhpur.