Figure 3.

The involvement of phytochrome in the light-dependent volume changes observed in protoplasts of peeled stems. Experiments were conducted as described for Figure 2 with the treatment protocol illustrated in each panel. The protoplasts in E through H were exposed to a pulse of blue light immediately after time zero (see Fig. 2), but those in A through D were not exposed. The means ± se from 23 to 30 protoplasts are shown.