Figure 2.

Tropic phenotypes of arl2 shoots. A, Kinetics of hypocotyl gravitropism in darkness for wild-type Est, arg1-2, and arl2-1 mutant seedlings (n = 111-168). B, Hypocotyl phototropism of 42-h-old seedlings exposed to a single pulse of blue light (450 nm) at a fluence rate of 0.15 μm m^-2 s^-1. Hypocotyl curvatures were measured 30 min after phototropic stimulation (n = 58-104). C, Kinetics of primary inflorescence stem gravitropism in darkness for 3- to 3.5-week-old wild-type and arl2-3 mutant plants (n = 15-16). As in Figure 1, ses are shown by vertical bars that are often masked by the curve symbols.