In 2003 and 2004, an experiment was carried out for the purpose of investigating the effect of light exposure on the depth of greening and accumulation of chlorophyll & glycolalkaloids in tubers of 14 edible potato varieties. It was noted that the rate of glycoalkaloids accumulation in both the subepidermal and internal parts of potato tubers was genetically predetermined. When potato tubers were peeled, the content of glycoalkaloids decreased from 50.5 do 69% depending on the potato cultivar. However, their content in peeled tubers was higher than in non-peeled tubers stored in darkness (control sample of potatoes). It was evidenced that there was a significant correlation between the content of glycoalkaloids in the greening part of a potato tuber and in the peeled tubers, and the content of chlorophyll and the depth of greening.