| Smaller guard cell length likely increases resistance of water vapor through the stomata. |
| The inner anticlinal wall of the guard cell is the ventral wall. |
| As Zeiger et al. have recently emphasized, guard cell chloroplasts show remarkable functional plasticity. |
| Fluorescence of guard cell chloroplasts was imaged when plants were at approximately the six-leaf stage. |
| This guard cell response to CO 2 acclimatizes to the environmental conditions on the transfer of plants between the two environments. |
| Major questions therefore remain unanswered on how water stress signals perceived at root and leaf locations are integrated at the guard cell to control stomatal behaviour. |
