Transmission electron microscopy of plastids in leaf three of BRZ treated plants. Plants were grown and harvested as described in Figure 1 at the middle of the light period. A, control (0 μM BRZ) at day 3. B, 10 μM BRZ at day 3. C, 20 μM BRZ at day 3. D, control at day 6. E, 10 μM BRZ at day 6. F, 20 μM BRZ at day 6. Subcellular structures are exemplarily indicated in A; cw, cell wall; g, granum (stack of thylakoids); s, starch granule; bar: 1 μm.