紫心甘薯花青素积累与PAL活性的关系
The Relationship Between Anthocyanidin Accumulation and Phenylalnine Ammonialyase Activity in Purple-Fleshed Sweet Potato[Ipomoea batatas(L.)Lam.]
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摘要: 以块根着色程度不同的2个紫心甘薯品系‘A3'和‘山川紫'为试材,以白心甘薯‘禺北白'为对照,对其不同器官(叶、茎和块根)的花青素含量和苯丙氨酸解氨酶(PAL)的活性进行了测定,对它们之间的变化趋势进行了相关性分析并建立了回归模型.结果表明:不论是不同品系的整株水平,还是同一品系的不同器官,着色程度深的部位,花青素的含量较高,PAL活性也较高.相关性分析以及回归模型显示,花青素含量与PAL活性之间呈极显著的线性正相关.说明PAL是紫心甘薯花青素合成的关键酶.Abstract: 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.
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