The Relationship Between Anthocyanidin Accumulation and Phenylalnine Ammonialyase Activity in Purple-Fleshed Sweet Potato [Ipomoea batatas(L.) Lam.]

The contents of anthocyanin and the enzyme activities of phenylalanine ammonialyase(PAL) in different organs of three strains of sweet potato [Ipomoea batatas(L.) Lam.],including two purple-fleshed strains(A3 and Yamakawamurasaki) and one white-fleshed strain(Yubeibai) were determined.The relationship between anthocyanin content and PAL activity was investigated by correlation analysis,and a linear regression model was established.The results indicated that the activity of PAL was significantly and positively correlated with the content of anthocyanin,whether in different organs of the same strain or in the whole plant of different strains,thus indicating that PAL is one of the key enzymes in anthocyanin synthesis in purple-fleshed sweet potato.