(a–c) Hypocotyl lengths of 5-day-old Col-0, bop1, bop2, and bop1 bop2 seedlings grown in constant white light (a), blue light (b), and far-red light (c) of different fluence rates, using cry1, cry2, and phyA as negative controls. (d) kinematic analysis of hook angles in response to red light for Col-0, bop1, bop2, and bop1 bop2 plants. Seedlings were firstly grown in dark for 3 days then transferred to 6 μmol·m−2·s−1 red light. The scheme at the right panel indicates the angel that was measured. Quantitative data are shown as means ± s.d., n = 25 in (a, b, c) and n = 7–13 in (d).