Figure 3.

The effects of wavelength and phytochrome deficiency on light induction of CPD. A, LUC activity of CPD:LUC transgenic plants under photoperiods of different wavelengths. Seedlings were entrained in LD (white light/dark cycles) for 7 d from germination, then grown further under photoperiods of the same length using white, red, or blue light sources (LD, RD, or BD, respectively). Zero time is the beginning of the last (eighth) common white illumination. B, Diurnal CPD:LUC transgene activity in wild-type and phyA-201phyB-5 backgrounds. C, To aid the comparison of the rhythmic component of expression, data from B were normalized for the average luminescence of the individual lines, as detected during the measurements. Zero time is the start of the eighth light period. White and black bars at the time scale indicate white light and dark periods, respectively. Each section shows the result of a representative measurement.