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Genetic variability, correlation, path coefficient and D2 analysis for morphological and biochemical parameters of mango fruit

KrishiKosh

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Title Genetic variability, correlation, path coefficient and D2 analysis for morphological and biochemical parameters of mango fruit
 
Creator RATHOD, BIPIN P.
 
Contributor NAIK, A.G.
 
Subject fruits, sugar, genotypes, reducing sugars, genetics, acidity, environment, mangoes, phenotypes, biological phenomena
 
Description Mango is (Mangifera indica L.) is an important tropical as well as
subtropical fruit crop of India. Due to wide variability it holds a large potential for
further improvement. The present investigation was carried out at the laboratory of
the Department of Horticulture, N. M. College of Agriculture, Navsari
Agricultural University, Navsari. The experiment was conducted in randomized
block design having three replications for two consecutive years 2005 and 2006.
The fruits of mango genotypes were selected from Regional Horticultural
Research Station, NAU, Navsari and harvested at “Tapka” stage. Thirty five
genotypes of diverse geographic origin of mango were evaluated with the
objective to study the magnitude of variability, correlation coefficient, path
coefficient and genetic divergence. The characters studied were fruit weight, fruit
volume, fruit length, fruit width, specific gravity, peel %, stone %, pulp %, TSS,
acidity, ascorbic acid, total sugar, reducing sugar and non reducing sugar.
The analysis of variance revealed significant differences among the
genotypes for all the traits. Fruit weight, fruit volume and ascorbic acid showed
high to moderated genotypic and phenotypic variance. The higher estimates of
GCV and PCV were obtained for ascorbic acid, fruit volume, fruit weight, acidity,
peel %, stone %, non reducing sugar, fruit length and reducing sugar. The
characters like acidity, ascorbic acid, non reducing sugar, reducing sugar, fruit
length, fruit weight, peel % and stone % exhibited high heritability coupled with
high genetic advance, indicating better scope for improvement of these traits by an
effective selection programme.
The estimates of correlation coefficient revealed that, in general the
genotypic correlation were higher than their corresponding phenotypic correlations
for all the characters. This clearly indicated the phenotypic expression for the
correlation is reduced by the influence of environmental fluctuations, despite
inherent associations between various characters. It was observed that fruit
volume, fruit length, fruit width and pulp % were the most important characters
for enhancement of fruit weight.
Path analysis based on genotypic correlations showed that fruit volume,
pulp %, stone %, peel %, non reducing sugar, reducing sugar were the major
characters exerting considerable direct effect on fruit weight, thus revealing scope
for considering these characters in selection.
Genetic diversity as assessed by Mahalanobis’s D2 statistics revealed the
presence of great deal of genetic diversity in the genotype studied. The thirty five
genotypes were distributed in seven distinct clusters and the genotypes grouped in
each cluster showed different behavior irrespective of their origin, suggesting that
geographical diversity was not related to genetic diversity. The large intracluster
distance within cluster IV suggested the presence of genetic variability within the
cluster. The intracluster distance was maximum between cluster IV and VII
followed by cluster IV and VI, cluster IV and VII, cluster I and IV and cluster II
and IV as these groups of genotypes were highly divergent from each other.
Genotype with high fruit weight and high intercluster distance are pin pointed for
their utilization in a crossing progaramme to realize the broad spectrum of genetic
variability in segregating generations to effect selection for fruit weight
improvement.
Among different characters studied fruit length contributed the maximum
towards total divergence followed by fruit width, TSS, ascorbic acid, peel % and
acidity.
 
Date 2016-03-05T13:25:26Z
2016-03-05T13:25:26Z
2007
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/64860
 
Language en
 
Format application/pdf
 
Publisher Navsari Agricultural University, Navsari