| This guard cell response to CO 2 acclimatizes to the environmental conditions on the transfer of plants between the two environments. |
| Fluorescence of guard cell chloroplasts was imaged when plants were at approximately the six-leaf stage. |
| The details of guard cell wall composition and organization are, unfortunately, not known. |
| The guard cell cannot expand because it is held tight in its cellulose ring. |
| Cellulose microfibrils within the guard cell wall are considered radial if they are oriented in the same way as the dotted lines. |
| As Zeiger et al. have recently emphasized, guard cell chloroplasts show remarkable functional plasticity. |
