Figure 8.

Scheme Demonstrating the Possible Sites of Action of FHY3, TIC, and ELF3 in the Gating of Signals from the Phytochrome (PHY) and Cryptochrome (CRY) Photoreceptors.

FHY3 acts to gate signals on a branch of the red light pathway mediating light input to the clock. TIC and ELF3 affect all light-signaling pathways tested. TIC and ELF3 together may act to gate both the red and blue light input pathways upstream of a divergence of a branch mediating photomorphogenic responses (light inhibition of hypocotyl elongation and direct induction of CAB2 gene expression) and a branch mediating light input to the clock.