Nitrogen depletion and small R3-MYB transcription factors affecting anthocyanin accumulation in Arabidopsis leaves

Small R3-MYBs are involved in anthocyanin, trichome and root hair formation through their interaction with MBW-complexes. In response to nitrogen depletion in Arabidopsis rosette stage plants, expression of R3-MYBs CPC and ETC3/CPL3 increased two and 9-fold, respectively. CPC, but not ETC3/CPL3 exerted a negative feedback on anthocyanin accumulation.