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GENETIC ANALYSIS FOR YIELD AND LEAF SPOT RESISTANCE IN GROUNDNUT (Arachis hypogaea L.)

KrishiKosh

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Title GENETIC ANALYSIS FOR YIELD AND LEAF SPOT RESISTANCE IN GROUNDNUT (Arachis hypogaea L.)
 
Creator TSEWANG DOLMA
 
Contributor REDDI SEKHAR, M
 
Subject GENETIC, ANALYSIS, YIELD, LEAF, SPOT, RESISTANCE, GROUNDNUT
 
Description The present investigation consisting of 33 genotypes of Groundnut
(Arachis hypogaea L.) was undertaken to study the variability and genetic
parameters, genetic divergence, character association, path analysis, disease
screening for late leaf spot resistance at the field as well as the molecular
diversity analysis was carried out in ten selected genotypes drawn from various
clusters based on D2 analysis. The experiment was laid out at Wetland farm,
S.V. Agricultural College, Tirupati in a Randomized Block Design with three
replications during late kharif, 2006. The data were recorded on ten
quantitative characters as well as for disease screening for late leaf spot
resistance.
Analysis of variance indicated the existence of significant genotypic
differences among genotypes for all the characters studied. The genotypes
ISK-04-03 and Narayani showed high mean performance for kernel yield and
its component characters viz., days to maturity, number of primary branches
per plant, shelling percentage, pod yield per plant, harvest index, sound mature
kernel per cent and plant height.
Genetic parameters revealed high GCV and PCV, high heritability
coupled with high genetic advance as percent of mean for sound mature kernel
per cent, test weight, kernel yield per plant and harvest index indicating that
these traits can be improved by simple selection methods.
The multivariate analysis revealed that the 33 genotypes had
considerable amount of diversity. The mode of distribution of genotypes to
various clusters were at random suggesting that there is no correlation between
geographical distribution and genetic diversity. A comparison of D2 analysis
with Metroglyph analysis revealed that clustering pattern in both the cases
were different. In Metroglyph analysis only two most variable characters viz.,
sound mature kernel per cent and shelling percentage were considered whereas
in D2 analysis consideration were given to all the characters and the D2 values
were based on pooled means of all the values representing the actual
divergence.
The Mahalanobis’s D2 analysis formed six clusters. Cluster I comprised
of 18 genotypes, cluster II ten genotypes, cluster IV two genotypes whereas
clusters III, V and VI comprising of one genotype each. The characters LLS
score at 70 DAS and test weight contributed the maximum towards genetic
divergence in D2 analysis. Based on inter-cluster distances, the clusters IV and
V were adjudged as the most divergent clusters. The genotypes ISK-04-26 (IV)
is highly resistant to late leaf spot disease whereas the genotype ISK-04-11 (V)
recorded the highest plant height and high yield as well. Hence, genotypes in
these clusters namely ISK-04-26 and ISK-04-11 were suggested for inclusion
in hybridization programme for obtaining superior and desirable recombinants
having high resistance to LLS coupled with high yield.
Character association studies indicated the significant positive
correlation of pod yield per plant, shelling percentage, plant height, sound
mature kernel per cent, test weight and harvest index with kernel yield and also
among themselves. Path co-efficient analysis revealed that pod yield per plant,
shelling percentage, plant height and sound mature kernel per cent are
important yield components having direct bearing on the improvement of
kernel yield in groundnut.
RAPD analysis detected a moderate level of genetic variation among the
ten genotypes of groundnut selected from different clusters formed from D2
analysis. A high degree of polymorphism was obtained with the primer OPH
20 (5 polymorphic bands) whereas moderate polymorphism was obtained with
the primers OPA 3 (5 polymorphic bands), OPA 5 (3 polymorphic bands), OPJ
4 (2 Polymorphic bands) and OPJ 12 (2 polymorphic bands). The similarity
index values ranged from 0.500 to 1.00 indicating a moderate range of
variability at the molecular level in case of groundnut.
 
Date 2016-08-08T14:44:50Z
2016-08-08T14:44:50Z
2007
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/71571
 
Language en
 
Relation D8192;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD