Figure 12.

Red Light Inhibition of Blue Light–Induced PHOT1-GFP Is Mediated by phyA.

Projection images of cortical cells from hypocotyls of 3-d-old etiolated Arabidopsis seedlings. Red light (R) treatment (10 μmol m⁻² s⁻¹ for 10 s) was followed by 2 h of incubation in the dark prior to blue light (B) treatment (20 μmol m⁻² s⁻¹ for 100 s). Blue light source from LEDs. Bars = 20 μm.

(A) In the absence of phyA, red light fails to prevent blue light–induced PHOT1-GFP relocalization.

(B) In the absence of phyB, red light is fully effective in preventing PHOT1-GFP relocalization.