Figure 2.

Phototropic responses of transgenic Arabidopsis seedlings Wild-type, phot1-5 phot2-1, and transgenic Arabidopsis lines expressing Pp_phot:GFP were grown in the dark for 3 days, and irradiated by unilateral blue light (5 μmol m⁻² s⁻¹) for 16 hr before imaging. All of the transgenic lines were heterozygous for the transferred gene. Scale bars, 1 cm. (left). The percentage of seedlings with hypocotyl angles relative to vertical is shown in 6 classes: less than −30, −30 ~ −10, −10 ~ 10, 10 ~ 30, 30 ~ 50, and more than 50°. A positive value indicates the degree of curvature which shows bending toward the light source. Hypocotyl curvatures were measured in at least 74 seedlings (right).