The effect of extended cold storage on the functional quality attributes of different potato genotypes
Imen Tlili, Riadh Ilahy, Samir Ghannem, Leila Romdhane, Hatem Ben Mohamed, Zoltán Pék, Mohammed Wasim Siddiqui, Lajos Helyes, Sándor Takács, Marcello Salvatore Lenucci, Nouri Khamassy- Agronomy and Crop Science
Abstract
Potato (Solanum tuberosum L.) is a staple food widely consumed in Tunisia and represents a source of various secondary metabolites with human health benefits. However, cold storage of potato tuber affects their bioactive properties and functional quality. Despite the importance of this fact, few studies have examined the effects of extended cold storage on potato tubers quality. Therefore, the objective of the present work was to evaluate the effect of cold storage on the main quality traits of different potato genotypes grown in Tunisia. This investigation focused on four cultivated potato varieties including three commercial (Selena, Elbeidha and Naima) and a selected clone CL27 grown under late cropping season conditions with planting at the beginning of autumn and a winter tuberization. The tubers from this trial were stored for 90 days at 8°C. The results obtained showed that quality traits of potato tubers were strongly influenced by storage at 8 ° C throughout 90 days. Additionally, disregarding the genotype, total carotenoids, phenolics and flavonoids contents increased significantly following 90 days storage at 8°C. However, genotypic differences underlying the antioxidant activity in both hydrophilic and lipophilic fractions were detected suggesting their sensibility to cold storage. This study might be useful for breeders working on potato genotypes suitable for extended storage duration and for growers storing their material for extended period under low temperature.
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