STUDIES ON GENOTYPE x ENVIRONMENT INTERACTIONS IN SELECTED GENOTYPES OF GROUNDNUT (Arachis hypogaea L.) OVER EXTENDED DATES OF SOWING
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Date
2009-07-16
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University of Agricultural Sciences GKVK, Bangalore
Abstract
Twenty groundnut genotypes were evaluated in three environments from
July III week to August II week for 15 characters to study Genotype x
Environment interaction, correlation, path analysis and screening for disease
resistance. Mean performance of genotypes in three different environments
indicated that environment I was the most favorable for better expression of
most of the characters. The phenotypic stability of 20 selected genotypes over
three environments was estimated for yield and yield related traits. The mean
square due to genotypes, environments and genotype x environment
interaction were found significant for all the characters. GPBD-4, K-6, TMV-2,
VG-9866 were promising genotypes for pod yield for majority of characters with
higher mean performance across the three environments. The character
association indicated a strong positive association between association between
pod yield per plant and kernel yield per plant, oil yield per plant, and late leaf
spot resistance irrespective of the environments. Plant height, 100 kernel
weight and harvest index were strongly correlated with kernel yield per plant
and pod yield per plant. The path coefficient analysis revealed that direct effect
of kernel yield per plant was highest followed by oil content, oil yield per plant.
The indirect effect was highest through harvest index, number of matured pods
per plant, late leaf spot resistance, rust resistance and 100-kernel weight. Out
of 20 genotypes screened for resistance to diseases Chintamani-1, Chintamani-
2, Chintamani-3, R-2001-2, GPBD-4, K-134 were resistant to rust and late leaf
spot in all the environments.
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