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STUDIES ON GENETIC VARIABILITY, HERITABILITY, CORRELATION AND PATH COEFFICIENT ANALYSIS IN BOTTLE GOURD [Lagenaria siceraria (Mol.) Standl.] GENOTYPES

KrishiKosh

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Title STUDIES ON GENETIC VARIABILITY, HERITABILITY, CORRELATION AND PATH COEFFICIENT ANALYSIS IN BOTTLE GOURD [Lagenaria siceraria (Mol.) Standl.] GENOTYPES
 
Creator BANDARU DEEPTHI
 
Contributor Dr.P. SYAM SUNDAR REDDY
 
Subject magnitude of genetic variability, heritability ,RBD
 
Description The 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 relationship and divergence for the quantitative characters in bottle gourd [Lagenaria siceraria (Mol) Standl.] genotypes. Twenty three genotypes of bottle gourd along with one check variety Pusa Naveen were evaluated in RBD with three replications during spring summer of 2012 at Horticultural College and Research Institute, Dr. Y. S. R. Horticultural University, Venkataramannagudem, West Godavari district, Andhra Pradesh.
The study revealed significant differences among genotypes for different characters studied. Among all the genotypes studied, genotypes IC 249671 recorded the highest yield per vine and found suitable to the local agro-climatic conditions. The genotypes IC 249663, IC 249672 and check variety Pusa Naveen were also found to be elite for different characters.
Among the characters studied, high PCV and GCV were observed for characters like primary branches per vine, node at which first male flower appears, number of fruits per vine, fruit weight (g), fruit length (cm), fruit diameter (cm), yield per vine (kg), total yield (t/ha), number of seeds per fruit and 100 seed weight (g) 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 tendril length (cm), number of primary branches, days to first male flower apperarance, node at first male flower appears, number of fruits per vine, fruit weight (g), fruit length (cm), fruit diameter (cm), yield per vine (kg), total yield (t/ha), number of seeds and 100 seed weight (g) indicated 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 per vine (kg) had significant positive correlation with traits like tendril length (cm), number of nodes per vine, number of primary branches per vine, total vine length (m), internodal length (cm), number of fruits per vine, fruit weight (g), fruit diameter (cm), number of seeds per fruit and 100 seed weight (g) 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 bottle gourd.
The fruit yield per vine (kg) was result of direct effect of total vine length (m), number of fruits per vine, fruit weight (g). The high direct effect of these traits appeared to be the main factor for their strong association with fruit yield per vine.
Analysis for divergence using D2 statistic revealed highly significant differences for different traits, grouping the 23 genotypes into 5 clusters. Cluster III had the maximum number of genotypes (11) followed by cluster IV (8). Maximum inter cluster distance was observed between clusters II and V while the intra cluster distance was maximum in cluster I. Highest percent contribution to divergence came from 100 seed weight (g), fruit diameter (cm), number of seeds fruit and fruit length (cm) suggested that selection of one or two elite genotypes from divergent (II & V) and (I & V) clusters based on the above characters and crossing would result in more heterosis and novel hybrids.
 
Date 2016-07-25T11:00:34Z
2016-07-25T11:00:34Z
2013-06
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/69697
 
Language en
 
Format application/pdf
 
Publisher Dr. Y. S. R. HORTICULTURAL UNIVERSITY