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Light control of IAA production. Simplified schematics of the tryptophan-dependent auxin biosynthesis pathways (Mikkelsen et al. 2004; Lau et al. 2008; Tao et al. 2008). Some additional branches have been omitted for clarity. As phyB-Pfr enhances SUR2 and represses TTA1 transcript levels, a low R:FR-light growth condition triggers the reciprocal control, leading to an increase in IAA production.
