The bHLH transcription factor AcB2 regulates anthocyanin biosynthesis in onion (Allium cepa L.).

ABSTRACT: Onion bulb color is a key breeding trait. The red bulb color is caused by the presence of anthocyanins, which are products of the flavonoid synthesis pathway. Research on flavonoid regulation in onion is lagging compared with that in other crops. AcB2 encodes a basic helix-loop-helix (bHLH) transcription factor, and its transcription is positively associated with anthocyanin accumulation and correlated with the expression of AcMYB1, which is an activator in the flavonoid biosynthetic pathway in onion. Phylogenetic analysis showed that AcB2 was grouped into the TRANSPARENT TESTA 8 (TT8) clade of the bHLH IIIf subgroup. The AcB2 protein contained an MYB-interacting region and physically interacted with AcMYB1 in yeast and tobacco leaves. AcMYB1 directly bound to the promoters o

SUBMITTER: Li X 

PROVIDER: S-EPMC9418810 | biostudies-literature | 2022

REPOSITORIES: biostudies-literature