**5. Conclusions**

In this study, it was found that *MYBA1/2* and *MYBPA1*, the key genes involved in anthocyanin synthesis in grapes, were highly expressed in red grape varieties, and their expression levels in white grapes were significantly lower than in red grapes. The expressions of *UFGT* and *LDOX* genes were positively correlated with the key peel-colorrelated gene of MYBA. A newly discovered gene (gene ID: Vitvi19g01871) in this study may play a key regulatory role in grape skin coloration.

**Author Contributions:** Experimental design, Y.X. and W.W.; data curation, H.F. and L.Y.; figures and table making, Y.H. and Z.D.; writing, H.F. and W.W.; manuscript review and editing, M.K.-U.-R. and G.Y. All authors have read and agreed to the published version of the manuscript.

**Funding:** This work was supported by grants from the National Natural Science Foundation of China Youth Fund (No. 32002015), the Natural Science Foundation Youth Fund of Hunan Province (2021JJ40252), and the Hunan Provincial Department of Education Scientific Research Project— General Project (19C0926).

**Data Availability Statement:** Not applicable.

**Conflicts of Interest:** The authors declare no conflict of interest.
