Genotype × Environment interaction effect on processing attributes of potato

Sixteen potato genotypes were evaluated for processing attributes in three different environments viz., dehaulming at 70 days (E1), 90 days (E2) and 110 days (E3) after planting, at the Vegetable Research Farm, PAU, Ludhiana during autumn season of 2015–16. Stability analysis was carried out using Eberhart and Russell's model. The genotype, environment and genotype × environment (G×E) interaction effects were significant for all characters, suggesting the occurrence of considerable variability among genotypes, environments and differential response of genotypes across environments. Among genotypes, Kufri Frysona exhibited above average stability for dry matter and reducing sugars, indicating that it can perform better in unfavourable environment. Similar response was observed in Kufri Chandramukhi for free amino acids. Genotypes, MP/06–39, MS/06–819 and Kufri Pushkar were found highly stable for total phenols, total glyco-alkaloids and total tuber yield, respectively. Overall, none of the genotypes displayed stability across all the three environments for all the six characters, indicating that selection of season and purpose specific genotypes is very critical in potato.