Effects of ABA on expression of genes related to anthocyanin biosynthesis in grapevine

Abstract：The Jingyou grape cultivars was used to study changes of anthocyanin contents, the transcription of anthocyanin biosynthesis enzyme genes and transcription factors during the fruit coloring period as well as the influence by ABA treatments of different concentrations. The results showed that the transcrip- tion of CHS3, CHI2, UFGT, MybA 1 and MybA 2 genes was closely related to the anthocyanin synthesis during the fruit coloring period and their expression increased as anthocyanin synthesis. Anthocyanin con- tents increased by the ABA treatment. Meanwhile, the transcription levels and expression time of antho- cyanin biosynthesis relevant genes were also improved. The expression of CHS3 and UFGT was significantly improved by ABA. Correlation analysis showed that anthocyanin contents was significantly positively correlated with the expression of some structural genes （CHS3, CHI2, F3H2 and UFGT） and tran- scription factors （MybA 1）, while there was no significant correlation between anthocyanin contents and the expression of CHS1, CHS2, CHI1, F3H1, DFR, F3＇H, LDOX and OMT.