Assessment of genetic variability and path coefficient analysis in drought tolerant genotypes of groundnut (Arachis hypogaea L.)
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Date
2005
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Publisher
MPUAT, Udaipur
Abstract
The present investigation entitled “Assessment of genetic variability and path
coefficient analysis in drought tolerant genotypes of groundnut (Arachis hypogaea)” was
carried out using 30 genotypes including two checks. The genotypes were planted in
randomized block design with four replications during Kharif 2004 at experimental
farm, Department of Plant Breeding & Genetics, Rajasthan College of Agriculture,
Udaipur.
The observations were recorded on 10 randomly selected plants for each
genotype for all the characters except days to flower initiation, days to 50% flowering,
days to maturity and oil content where entire population of the genotype was
considered. Eleven characters viz. days to flower initiation, days to 50% flowering, leaf
are index, leaf dry weight, days to maturity, number of pods per plant, dry pod yield per
plant, kernel yield per plant, shelling percentage, harvest index and oil content were
subjected to analysis of variance, estimation of variability parameters and correlations,
path coefficient analysis, construction of selection indices and estimation of correlated
response.
Analysis of variance indicated that experimental material possess good amount
of variability for all the characters under study. The genotypes ICGV-97261, ISK-21
and ISK-18 were found to have higher mean values for number of pods per plant, dry
pod yield per plant, kernel yield per plant and per cent oil content hence emphasis
should be laid upon to utilize these genotypes for groundnut improvement.
High heritability coupled with high genetic gain and high GCV had been
exhibited by the characters viz. leaf area index, kernel yield per plant, leaf dry weight
and dry pod yield per plant. There is a substantial scope for improvement of these
characters. Characters like dry pod yield per plant, leaf dry weight, number of pods per
plant and shelling percentage showed positive and significant association with kernel
yield per plant.
Path analysis for kernel yield per plant showed that the kernel yield per plant
had highest direct positive contribution of dry pod yield per plant. Kernel yield indirectly contributed by dry pod yield via leaf dry weight and number of pods per
plant.
Selection index having combination of four characters viz. kernel yield per plant,
number of pods per plant, shelling percentage and harvest index was found best tool for
selection for maximum kernel yield.
Shelling percentage, harvest index, dry pod yield per plant and number of pods
per plant were the correlated characters that would show great change if selection
practisized for kernel yield per plant.
Overall view of research indicated that the characters viz. dry pod yield per
plant, leaf dry weight, number of pods per plant and shelling percentage exhibited high
GCV, high heritability and high expected genetic gain in addition to high correlation
with kernel yield per plant and high direct and indirect positive effects on kernel yield
per plant. Further, the selection index having combination of these traits showing
maximum effect of selection on kernel yield per plant. Correlated response of selection
for kernel yield per plant also high for these traits, hence emphasis should be given to
improve these traits in future breeding programme to enhance kernel yield per plant.
The lines ICGV-97261, ISK-21, ISK-18 and checks Chico and Local check are having
high mean values of these traits. Hence, these should be utilized as parental material in
future breeding programme for groundnut improvement.
Description
Assessment of genetic variability and path coefficient analysis in drought tolerant
genotypes of groundnut (Arachis hypogaea L.)
Keywords
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Citation
Patidar and Dodiya, 2005