Genetic Variation and Stability Analysis in Diverse Groundnut (Arachis hypogea L.) Cultivars under Drought Stress

Résumé fourni par la source

Abstract Climate change has led to drought stresses recurring in different crops. Drought stress adversely impacts ground nut production. Ground nuts need to be explored for genetic variation for drought tolerance. This study evaluated 60 groundnut genotypes of three growth habits (Spanish bunch, Virginia bunch and Virginia runner) to identify drought-tolerant genotypes. Artificial drought was induced using PEG-6000 (10 and 20%) and different traits like germination percentage, root length, shoot length, fresh weight, and dry weight were observed. Results revealed the significant influence of G × E interaction on most traits, indicating the reliance of genotypic performance on the environment. All traits showed reduction under drought stress treatments. Interaction effects between growth habits and drought environment varied for specific traits, suggesting diverse responses of genotypes based on growth habits. Spanish bunch genotypes generally outperformed Virginia bunch and Virginia runner genotypes in all traits across the environments. Biplots were able to capture high proportion of variation (96–99%). The stable genotypes TG 37A, RG-702, RG-628, RG-584, and ICGV-6119 demonstrated consistency across all traits and can be potentially exploited for enhancing drought tolerance in groundnut breeding programs.

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