Acts as negative regulator of seedling photomorphogenesis (PubMed:18540109). Acts as a negative regulator of blue light-mediated inhibition of hypocotyl elongation through increase of bioactive gibberellin levels (PubMed:20872270). Acts as a repressor of thermotolerance by modulating expression of a set of heat shock-responsive genes (PubMed:23238922). Expressed in vasculature of leaves and petioles. By blue light (PubMed:20872270) and heat shock (at protein level) (PubMed:23238922).