Reconditioning and weather conditions affect black spot damage during storage of potato (Solanum tuberosumL.) tubers

Abstract

BACKGROUND In potatoes (Solanum tuberosum L.), mechanical damage can cause the formation of black spots in the tuber flesh as the result of oxidation of phenolic compounds. This damage can result in substantial economic losses and degradation of quality. External factors contributing to the formation and the prevention of black spot damage (BSD) are not fully understood. The aim of this study was to determine the effect of weather conditions, using a hydrothermal coefficient, and of two potato tuber reconditioning methods on the formation of BSD. Five potato varieties were divided into high, moderate and low BSD susceptibility groups. The research was carried out over two growing seasons that differed greatly in precipitation and temperature. The black spot index was determined immediately after harvest and after 3 and 7 months of storage. Two reconditioning methods, applied for 7 days at 8 °C and for 7 days at 15 °C, were used for each variety. RESULTS The incidence of BSD in susceptible varieties did not depend significantly on weather conditions, although statistically significant variation was observed. We found a correlation between the hydrothermal coefficient (dry conditions) and BSD in the Etiuda variety. There was no significant effect of storage time and temperature on BSD incidence in susceptible or moderately susceptible varieties. The reconditioning methods significantly reduced the formation of BSD in tubers after storage in all three groups. Regardless of the level of susceptibility of the variety, storage time and storage temperature, the most efficient treatment to limit BSD was reconditioning for 7 days at 15 °C. CONCLUSION Identification of the significant effects of weather, and strong reduction of BSD in tubers that had been reconditioned, allows examination of the underlying mechanisms. The described reconditioning method can lead to satisfactory reduction of BSD in potato tubers. Data from this research will be of interest to potato breeders, particularly if valuable alleles that affect this phenomeon can be isolated. © 2019 Society of Chemical Industry

Climate Change Impacts on Potato Storage

“…A robust correlation between the hydrothermal coefficient, representing the weather conditions during the growing season, and the impact of Black Scurf Disease (BSD) was evident only in the tubers of the Etiuda variety (no such significant correlation was observed for other cultivars. ), with correlation coefficients of r = 0.906 and R 2 = 0.8222 [43]. Their study shows that weather conditions do not significantly affect the black spot rate in potato tubers of susceptible varieties, even though variation observation with significant differences was documented.…”

“…This disparity arises from factors such as the immature skin and higher moisture content of early potatoes. Mechanical damage during harvesting can lead to the formation of black spots on the tubers' pulp, resulting in quality and economic losses [43].…”

“…Irrespective of susceptibility group, storage duration, and temperature, conditioning tubers for 7 days at 15 • C was the most effective method for mitigating BSD. The reconditioning process yielded the most favorable outcomes with tubers of the Jubilat variety, reducing the BSD rate by approximately 64% in 2013 and around 69% in 2014 [43].…”