Figure 6.

Ratio changes E₂ (620–670 nm)/E₁ (550–600 nm) in maize pulvinal cells from tissue slices before and after rotation by 90° (A–C) and 360° (D). A, Response of parenchyma cells (no amyloplasts); B, typical response of bundle sheath cells with amyloplast sedimentation base region of cells (▴) and side regions of cells (▾); C, transient response measured in side regions of bundle sheath cells showing amyloplast sedimentation, observed in 12% of recordings; D, response of bundle sheath cells to a full 360° rotation. Average values ± ses of representative data sets are shown and statistics are given in Table I.