Figure 8.

Fluence rate-response curves for photogravitropic equilibrium at different net accelerations. Sporangiophores were mounted on a centrifuge disc and were subjected to variable centrifugal accelerations while they were irradiated unilaterally with broad-band blue light (Fig. 7; see “Materials and Methods”). ○, 2.3g; ▪, 4.2g; ▵, 8.4g. Accelerations are net values. The bending angle of photogravitropic equilibrium was determined after 4.5 h as shown in Figure 7. The solid lines connecting the experimental points represent the fits to the hyperbolic function: y = ax/(x + b) + cx/(x + d) (Eq. 1).