Figure 9.

Relation between net gravitational acceleration (g) and the phototropic bending angle of wild-type sporangiophores for 20°, 30°, 40°, and 50° bending. Sporangiophores were irradiated with broad-band blue light. The values for 2.3g, 4.2g, and 8.4g were obtained from this work (Fig. 8). The data for 1g were obtained from Bergman et al. (1973). The solid lines connecting the experimental points represent the fits to the exponential function: y = a × exp(bx) (Eq. 2). The dashed line connecting the data points for the reference response of 50° is a spline fit provided by the plotting program.