Indian Society of Genetics & Plant Breeding

Delineating G × E interactions by AMMI method for root attributes in ashwagandha [Withania somnifera (L.) Dunal]

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In the present study, additive main effects and multiplicative
interactions (AMMI) biplot analyses was used to dissect
genotype x environment interaction (GEI) and to identify
location specific and widely adapted genotypes for root
branches, diameter and length in ashwagandha [Withania
somnifera (L.) Dunal]. Trials were conducted in randomized
complete block design (RCBD) with two replications over
three consecutive years at three different locations. ANOVA
analysis revealed environment, G×E interaction and
genotype effects to contribute significantly (p<0.001)
towards total sum of squares for root branches (61.00%,
22.18% and 14.00%); root diameter (51.06%, 24.26% and
15.34%) and root length (65.67%, 20.82% and 11.39%).
Further, the GEI for these traits was mostly explained by
the first, second and third principal component axis (IPCA1,
IPCA2 and IPCA3). AMMI1 and AMMI2 biplot analyses
showed differential stability of genotypes for root branches,
diameter and length with few exceptions. Environmental
contribution towards the genotypic performance from
AMMI1 and AMMI2 analysis for root traits except
environment Bhi16 contribution for root diameter and root
length. AMMI1 biplots and simultaneous selection index
(SSI) statistics identified SKA-11 as the most desirable
genotype for root branches and length while SKA-26 and
SKA-27 for root diameter. The ashwagandha genotypes
identified for root attributes could be advocated either for
varietal recommendation or in varietal development
program.  

Keywords: Ashwagandha, root traits, simultaneous selection index (SSI), principal component, GE interaction

Info

Year: 2020
Volume: 80
Issue: 4
 Article DOI: 10.31742/IJGPB.80.4.10
Print ISSN: 0019-5200
Online ISSN: 0975-6906

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