Genotype and Environment Effects on the Relationship between Protein Concentration and Trypsin Inhibitor Levels in Sweet Potatoes

Samples of sweet potatoes [ Ipomoea batatas (L.) Lam.] grown in field trials during 4 seasons in 1981 and 1982 were analyzed for trypsin inhibitor levels and protein concentration. A significant positive correlation between trypsin inhibitor levels and protein concentration was found in each season and between trypsin inhibitor level and dry matter content in 3 of the seasons. Clones were identified which had less trypsin inhibitor activity than predicted by multiple linear regression.