Thirty-six cultivars of potatoes were studied with respect to the total glycoalkaloids (TGA) content and greening capacity of the tuber. The determinations were made in the superficial portion of both newly harvested and tubers stored in the presence or absence of light during 25 days. The TGA content ranged betwen 3-24mg/100g of fresh weight. Both the storage conditions and the cultivars influenced the TGA content and greening capacity. There was a negative correlation between TGA content and the 440nm absorbance of a chloroform extract for newly harvested tubers. This correlation, however, was positive for the stored tubers. The present data suggest that both the TGA content and the greening capacity of the tubers were influenced by genetic characteristícs of each cultivar.