Genotype, location, and year influence antioxidant activity, carotenoid content, phenolic content, and composition in specialty potatoes.

The influence of genotype, location, and year on antioxidant activity (AOA), total phenolics (TP), total carotenoids (TC), and phenolic composition was studied using specialty (colored) potatoes ( Solanum tuberosum L.) from the Texas Potato Variety Development Program. Twenty-five potato genotypes were grown at two Texas locations (McCook and Dalhart) and in two years (2003 and 2004). The AOA, TP, and TC differed significantly with genotype (G), location (L), and year (Y). Phenolic composition differed significantly among genotypes and between locations. The AOA, TP, and chlorogenic acid content were significantly correlated with one another. Genotypic effects were significant for all parameters measured and were larger than location and year effects. Interaction effects (G × L and G × L × Y) were significant for most parameters, but were relatively smaller than genotypic effects. Lutein and violaxanthin were the major carotenoids identified, and genotypes differed significantly in their carotenoid conten...