Efficiency of selection based on genetic variability, path coefficient and genetic divergence in ridge gourd[Luffa acutangula L.(Roxb.)]
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Date
2016-06-16
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ANDUAT, Kumarganj, Ayodhya
Abstract
The experiment of the present research work entitled “Efficiency of selection based on
genetic variability, path coefficient and genetic divergence in ridge gourd [Luffa acutangula
L. (Roxb.)]” was conducted during zaid 2015. In this experiment twenty nine germplasm were
planted on 20th March, 2015 at Main Experiment Station, Department of Vegetable Science, at
Narendra Deva University of Agriculture & Technology, Narendra Nagar (Kumarganj), Faizabad
(U.P.). The crop continued till 16th July 2015. The experiment was conducted in Randomized Block
Design with three replications. The material used in the experiment comprised of twenty two selected
variable and pure germplasm of ridge gourd, including Pusa Nasdar a national check. The
experimental data was compiled by taking the mean value of the 29 genotypes of ridge gourd for 13
yield and its components traits from all the three replications. Then it was subjected to the following
statistical analyses; to evaluate mean performance, genetic variability, heritability, genetic advance,
correlation as well as path coefficient and genetic divergence for yield and its components traits.
The results of present studies indicate top five varieties showed highest marketable fruit yield
per plant was NDRG-9 followed by NDRG-5, NDRG-21, NDRG-1, NDRG-26. Besides, these
germplasm also possessed average to high mean performance for most of the yield components. The
data recorded on thirteen quantitative characters were subjected to analysis of variance to test the
significance of difference among the genotypes. Analysis of variance showed that the mean square
due to genotypes were highly significant for all the thirteen characters. The higher magnitude of
coefficient of variation at genotypic as well as phenotypic levels were observed higher for node
number to anthesis of first staminate flower followed by node number to anthesis first pistillate,
marketable fruit yield per plant and average fruit diameter while days to first fruit harvest had lowest
coefficients of variation. The presences of high heritability in broad sense were observed for character
except node number to anthesis of first staminate flower. Moderate heritability and high genetic
advance in per cent of mean was recorded for number of nodes per vine followed by average fruit
length and marketable fruit yield per plant showing additive gene affect and very good response to
selection for improving above yield and yield contributing traits. Number of fruits per plant showed
highly significant positive correlation with marketable fruit yield per plant (kg) and days to first fruit
harvest. Path coefficient analysis revealed days to first fruit harvest indicated highest positive direct
effect on marketable fruit yield per plant followed by node number to anthesis of first staminate
flower and number of fruit per plant. Twenty nine genotypes were grouped into 6 non-overlapping
clusters. The different clusters showed considerable differences in intra-cluster group means for all
the traits. Therefore, crosses between members of clusters having high cluster means for important
characters coupled with high inter-cluster distances between them, are likely to be more useful. Major
cluster III and VI in divergence analysis contained genotypes of heterogeneous origin, thereby,
indicating no parallelism between genetic and geographic diversity. Therefore, crosses between
members of clusters separated by high inter-cluster distance are likely to produces desirable
heterotic F1(s) and segregates. The maximum intra-cluster distance was observed in case of cluster
III followed by cluster II and the maximum inter-cluster distance was found between cluster IV to
cluster VI followed by cluster IV to cluster V and cluster III to cluster VI. Genotypes of these diverse
clusters can be used for producing heterotic F1 and desirable segregates.
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