Fig. 1.

The +cry1, +cry1T, +cry2, and +cry2T mutants show hypocotyl curvatures that are irrelevant to the phototropic vector. Shown are phototropic responses of the wild types (WS and Ler), the quadruple mutant (quad), and the +phot1, +phot1T, +phot2, +phot2T, +cry1, +cry1T, +cry2, and +cry2T mutants. Each plant was exposed to blue light at a fluence rate of 100 μmol·m^–2·sec^–1 for 12 h. (For further details, see Supporting Text.) The light source was to the left in the pictures. The arrowhead indicates a knot in one hypocotyl.