Figure 1.

Time course of induction of phototropic curvature in wild-type and mutant seedlings exposed to continuous blue light. At the time intervals indicated, the seedlings were removed and angle of curvature was measured. For au and fri seedlings, the blue light exposure was continued for 6 h. A, Wild-type, au, and auhp1 mutants. B, Wild-type, fri, and frihp1 mutants. The inset shows the comparison of the mean curvature value (±sd) of wild-type, tri, and fritri mutants after 3 h of continuous blue light exposure.