The ehy5 m utants display elongated hypocotyl. A, Phenotype of segregated wild-type (WS), ehy5, hy5, and ehy5 hy5 double mutants in dark and different light conditions. Six-day old constant dark, WL (90 μmol m-2 s-1), FR (90 μmol m-2 s-1), RL (90 μmol m-2 s-1) and BL (45 μmol m-2 s-1) grown seedlings (a to e). B-C, Quantification of hypocotyl length of 6-day-old seedlings grown in constant dark and various fluences of WL, respectively. D-F, Quantification of hypocotyl length of 6-day-old constant FR (90 μmol m-2 s-1), RL (90 μmol m-2 s-1) and BL (45 μmol m-2 s-1) grown seedlings, respectively. The error bar indicates standard deviation (SD). The experiment was repeated more than twice and similar results were obtained each time. A representative result is presented. For measuring hypocotyl length, ~30 seedlings were used in each genotype.