Fig. 6

Regulatory network of anthocyanins accumulation in red- and white-leaved ornamental kales. In red leaves, BoTTG1, BoTT8, and Bol012528 form the MBW complex to activate BoDFR1, BoANS1 and 2, BoUGT79B1.1, and BoUT78D2 to promote anthocyanins biosynthesis on the cytosolic surface of the ER. In white and green leaves, the negative regulator BoMYBL2.1 is highly expressed to repress the LBGs. The transporter genes BoTT19.1 and 19.2 are highly expressed in red leaves to transport anthocyanins from the ER to the vacuole, thereby promoting the red leaf phenotype. High expression levels of BoTT19.1 and 19.2 may also feedback to activate LBGs by transporting greater amounts of anthocyanins