Figure 7.

A, Blue light-mediated phosphorylation in tomato hypocotyls of wild-type, fri, and hp1 mutant seedlings. The autoradiograph shows the in vitro blue light-dependent phosphorylation of soluble protein fractions prepared from tomato seedlings. The samples were irradiated with white light at a total fluence of 2,000 μmol m^–2 s^–1. B, Blue light-induced chloroplast relocation movement in a cell of cotyledon of wild-type seedling. The cell of cotyledon adapted under weak white light conditions (5 μmol m^–2 s^–1) was observed under red light. The cell was irradiated with weak blue light (3.7 μmol m^–2 s^–1) for 40 min (0–40 min) and then with strong blue light (56 μmol m^–2 s^–1) for 30 min (40–70 min). After irradiation, the cell was continuously observed without blue light irradiation (70–100 min).