GENETIC VARIABILITY STUDIES IN POINTED GOURD (Trichosanthes dioica Roxb.)
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Date
2017-06-06
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COLLEGE OF HORTICULTURE, VENKATARAMANNAGUDEM, WEST GODAVARI – 534 101 Dr. Y. S. R. HORTICULTURAL UNIVERSITY
Abstract
An experiment was taken up to elicit the information on magnitude of genetic variability, heritability and to predict the gains realized through selection, character association, cause and effect relationships and economics of pointed gourd (Trichosanthes dioica Roxb.) genotypes. Twenty two genotypes of pointed gourd were evaluated in RBD with three replications during kharif season of 2016-17 at College of Horticulture, Dr. Y. S. R. Horticultural University, Venkataramannagudem, West Godavari district, Andhra Pradesh.
The study revealed significant differences among the genotypes for different characters studied. Among all the genotypes studied, Swarna alaukik recorded the highest fruit yield followed by Bengal rani and Madanpur local-1 are found to be suitable to the local agro-climatic conditions.
Among the characters studied, high PCV and GCV were observed for characters viz., fruit weight (g), pulp weight per fruit (g), pulp seed ratio, number of seeds per fruit, seed weight per fruit ,internodal length and fruit yield (t/ha) indicating high variability available in the germplasm for these characters for further improvement.
High heritability coupled with high genetic advance as per cent of mean was observed for characters number of nodes per vine, internodal length, node at which first female flower appeared, fruit length, fruit weight, pulp weight per fruit, pulp
seed ratio, number of fruits per plant, fruit yield, number of seeds per fruit, seeds weight per fruit indicating that these characters were least influenced by the environmental effects and these characters were governed by additive genes and selection will be rewarding for improvement of such traits.
The fruit yield (t/ha) had significant positive correlation with traits like number of nodes per vine, fruit length (cm), fruit weight (g), pulp weight per fruit (g), pulp seed ratio, number of fruits per plant suggesting the importance of these traits in selection for yield and can be identified as yield attributing characters for the genetic improvement of yield in pointed gourd.
The fruit yield (t/ha) was result of direct effect of number of fruits per plant, number of nodes per vine, internodal length (cm). The high direct effect of these traits appeared to be the main factor for their strong association with fruit yield.
Based on the economic analysis genotype Swarna alaukik was found to be highly profitable due to maximum net returns and benefit cost ratio followed by Bengal rani and Madanpur local-1. so they may be selected for further evaluation for their suitability for cultivation in Coastal districts of Andhra Pradesh.
Description
The study revealed significant differences among the genotypes for different characters studied. Among all the genotypes studied, Swarna alaukik recorded the highest fruit yield followed by Bengal rani and Madanpur local-1 are found to be suitable to the local agro-climatic conditions.
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Citation
College of Horticulture, Dr. Y. S. R. Horticultural University, Venkataramannagudem, West Godavari district, Andhra Pradesh