Figure 5.

Evidence for synergism between cry1 and novel phytochrome(s). Seedlings of phyAphyB double mutants were grown under continuous red (R) or far-red light (FR) in factorial combination with or without the simultaneous addition of continuous blue light. A, Hypocotyl length relative to dark controls. B, The effects of blue light on hypocotyl length (i.e. the difference between the seedlings receiving supplementary blue light and those not receiving supplementary blue light) are larger when red light was used as a background than when far-red light was used (the two double-mutant alleles were pooled). C, Angle between the cotyledons. D, Effects of blue light added to red or far-red light on cotyledon unfolding.