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Plant Science Today (PST)

Research Articles

Vol. 13 No. sp2 (2026): Recent Advances in Agriculture

Stability analysis and selection of late blight resistant local potato genotypes using GGE biplot and AMMI analysis

DOI
https://doi.org/10.14719/pst.13426
Submitted
30 December 2025
Published
15-05-2026

Abstract

Potato (Solanum tuberosum L.) is the fourth most important food crop globally; its production is severely affected by late blight caused by oomycete Phytophthora infestans (Mont.) de Bary. The rapid evolution of the pathogen frequently overcomes race-specific resistance genes, necessitating simultaneous identification of stable and resistant genotypes.  In the present study, 30 potato genotypes comprising local landraces and released varieties were evaluated across 4 environments (2 locations over 2 consecutive rabi seasons, 2021–22 and 2022–23) using a randomised complete block design (RCBD) with 3 replications. Tuber yield and late blight severity, expressed as relative area under disease progress curve (rAUDPC), exhibited significant genotypic variation and strong genotype × environment interaction (GEI). Additive main effects and multiplicative interaction (AMMI) and genotype plus genotype-by-environment interaction (GGE) biplot analyses revealed that genotype, environment and their interaction significantly influenced both the traits. Small sized tuber producing local variety Jalpai and improved cultivar Kufri Chipsona 3 combined high and stable tuber yield with consistently low rAUDPC across environments. Chambal Jyoti, Red Bhutan and Tripura Local 3 showed high yield and late blight resistance in specific environments, whereas Kufri Jyoti, although high yielding, was consistently susceptible to late blight. These results identify promising genotypes for direct cultivation in late blight- prone regions and as parents in breeding programmes aimed at combining stable yield with durable resistance.

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