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STABILITY ANALYSIS IN GROUNDNUT (Arachis hypogaea L.)

KrishiKosh

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Title STABILITY ANALYSIS IN GROUNDNUT (Arachis hypogaea L.)
 
Creator TEJA, P
 
Contributor VASANTHI, R.P
 
Subject yields, planting, genotypes, environment, developmental stages, harvesting, harvest index, groundnuts, animal husbandry, genetics
 
Description The present investigation was carried out during kharif 2011 to study the genetic parameters, character association, path analysis and stability in fifty genotypes of groundnut (Arachis hypogaea L.) in three different environments represented by three dates of sowing, viz., June first fortnight, July first fortnight and August first fortnight. The experiment was laid out at dryland farm of S.V. Agricultural college, Tirupati in a randomized block design with two replications. Data were recorded on twelve characters.
Analysis of variance indicated the existence of significant genotypic differences for all the twelve characters under study. The genotypes TCGS 1014, TCGS 957 and TCGS 1157, TCGS 1043, TCGS 1071, TCGS 1275 and Dh 218 recorded high mean for kernel yield and yield components in all the three environments.
The analysis of genetic parameters revealed higher variation for the characters, plant height, kernel yield per plant, pod yield per plant, and harvest index in all the three environments. For these traits, heritability values were moderate to high which was reflected in moderate to high GAM values. Hence, these traits can be easily manipulated through simple phenotypic selection as these are largely governed by additive gene action.
Character association studies revealed that the traits pod yield per plant, harvest index, SMK percentage and shelling percentage showed consistent contribution to kernel yield across the environments. However, shelling percentage and harvest index in Environment I; pod yield per plant and harvest index in Environment II and protein content in Environment III were significantly correlated with kernel yield per plant. Hence these characters might be considered as selection indices for improving kernel yield in the respective environments.
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Path analysis revealed that the traits, pod yield per plant and shelling percentage exhibited high positive direct effects on kernel yield per plant across three environments. Hence, for improvement of groundnut yield, major thrust should be given on these traits in all the three environments.
Stability analysis studies revealed significant G x E interaction for all the characters i.e. plant height, days to 50 per cent flowering, SCMR, SLA, relative injury percentage, kernel yield per plant, pod yield per plant, shelling percentage, SMK percentage, harvest index, oil and protein contents. A higher magnitude of linear component of genotype x environment interaction than non-linear components was observed for most of the characters which indicated the possibility of predicting the performance of the genotypes in all the three environments.
Based on stability parameters, the genotypes JSP 53, ICGV 00351 and KDG 123 were found stable for kernel yield per plant across the three environments. Whereas, the genotypes TCGS 1275 for plant height and SLA, K 1392 and TCGS 1115 for SCMR, TPT 2 for relative injury percentage, TCGS 894 for pod yield per plant and harvest index, K-6 for shelling percentage were found stable across three environments. Hence, these genotypes could be exploited for further breeding of stable genotypes in all the three environments
 
Date 2016-06-17T10:09:56Z
2016-06-17T10:09:56Z
2012
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/67499
 
Language en
 
Relation D9356;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY