Figure 2.

Blue Light–Induced Enhancement of Plant Growth under Low PAR of Red Light.

(A) Fresh weight of green tissues of wild-type and mutant plants. Wild-type, phot1-5 phot2-1, phyA-201 phyB-5, and hy4-3 cry2-1 plants were grown for 4 weeks under red light (RL) (25 μmol m⁻² s⁻¹) with or without blue light (BL) (0.1 μmol m⁻² s⁻¹). Bars represent means ± se (n = 24). Asterisks indicate significant differences in fresh weights between red light and red light with blue light (P < 0.01).

(B) Wild-type plants were grown for 5 to 6 weeks under red light (25 μmol m⁻² s⁻¹) with or without blue light (0.1 μmol m⁻² s⁻¹).