Fig. 9. Anthocyanin biosynthesis pathway in purple head Chinese cabbage.

gBrMYB2 with short intron 1 controls anthocyanin biosynthesis and accumulation through coexpression of BrTT8 and activation of a series of structural ABGs, such as BrF3’H, BrDFR1, BrANS1, BrUGTs, BrATs, and BrGSTs, resulting in a purple-head phenotype. Similarly, gBrmyb2 of common white head Chinese cabbage with long intron 1 completely represses anthocyanin biosynthesis by restricting the expression of Brmyb2 and ABGs, resulting in a nonpurple-head trait