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Anthocyanin pigments furnish a powerful visual output of the stress and metabolic status of  Arabidopsis thaliana  plants. Essential for pigment accumulation is TRANSPARENT TESTA19 (TT19), a glutathione  S -transferase proposed to bind and stabilize anthocyanins, participating in their vacuolar sequestration, a function conserved across the flowering plants. Here, we report the identification of genetic suppressors that result in anthocyanin accumulation in the absence of TT19. We show that mutations in  RDR6 ,  SGS3 , or  DCL4  suppress the anthocyanin defect of  tt19  by pushing carbon towards flavonoid biosynthesis. This effect is not unique to  tt19  and extends to at least one other anthocyanin pathway gene mutant. This synergy between mutations in components of the RDR6-SGS3-DCL4 siRNA system and the flavonoid pathway reveals genetic/epigenetic mechanisms regulating metabolic fluxes.

Synergy between the anthocyanin and RDR6/SGS3/DCL4 siRNA pathways expose hidden features of Arabidopsis carbon metabolism