The 24 potato cultivars grown in three regions with different cultivation environments were investigated genotype and environment interaction (GEI) using the Additive Main Effects and Multiplicative Interaction (AMMI), and Genotype main effect and genotype by environment interaction (GGE) biplot model analysis. Potato yield was highly related to environment and GEI factors but the number of tubers and dry matter content were related to the genotype factor. Potato yield was the highest in ‘Seohong’ in Gangneung, ‘Dejima’ in Jinbu area, and ‘Saebong’ in Daegwallyeong area. As a result of analysis of GEI effect between genotypes and environment, ‘Seohong’ in yield, ‘Daejima in tuber, and ‘Goun’ in dry matter content were superior and were stable. The ‘Seohong’, which has the highest yield and stability, showed promising results and can substitute the ‘Superior’ variety. The ‘Goun’ was selected as a chip potato processing grade to replace ‘Dejima’, which currently is the major processing grade. Therefore, as a result of analysis of AMMI and GGE biplot models of agricultural traits of potatoes showed that the cultivation environment has greatest influence on the yield. Therefore, proper site selection for the desired cultivar is necessary for best results. Though it is also important to select the best genotype with a high dry matter content.

Potato glycoalkaloids (PGAs) are potentially toxic to humans at high levels, and current safety regulations have recommended that PGAs content in tubers of potato cultivars should not exceed 20 mg/100gFW. Accordingly, it is important to determine the PGAs composition and level on potato cultivars for food safety and the breeding for new cultivars with low levels of PGAs. The main aim of this study was to evaluate α-chaconine, α-solanine, and total PGAs content in the peel and cortex portions in four recent cultivars (‘Haryoung’, ‘Goun’, ‘Hongyoung’ and ‘Jayoung’), released by Highland Agriculture Research Center, together with ‘Superior’ and ‘Atlantic’. The total PGAs ranged from 16.5 to 47.7 mg/100gFW. The α-solanine/α -chaconine ratio was 1:3.2 (‘Jayoung’), 1:3.5 (‘Hongyoung’) and 1:2 (‘Superior’), whereas α-solanine was not detected in ‘Goun’, ‘Atlantic’ and ‘Hongyoung’ under the analytical condition of this experiment. 75-94% of total PGAs was existed in the peel part of all cultivars. We selected two cultivars (‘Atlantic’ and ‘Goun’) showing lower PGAs content in the cortex part. During storage at 4°C, total PGAs content fluctuated widely in early stage of storage and stabilized gradually over time in ‘Hongyoung’, ‘Superior’ and ‘Jayoung’. Thus, through the selection of cultivars and storage conditions, these results will provide consumers and breeders with fundamental information about the content of PGAs in Korea major cultivars.