Update: Stomatal biology of CAM plants

Crassulacean acid metabolism (CAM) plants open their stomata at night, decreasing water loss and increasing water-use efficiency as well as drought tolerance. Males and Griffiths review the stomatal biology of CAM plants as compared to C3 plants. For example, CAM stomata are relatively insensitive to blue light, which is a powerful opening stimulus for C3 stomata; conversely, CAM stomata appear to be more sensitive to plant water status and intercellular CO2 levels than C3 plants. However, deliniating differences between C3 and CAM stomatal biology is complicated by the fact that CAM is a convergent trait that has evolved independently many times in diverse lineages. Facultative CAM plants,  which can switch from C3 to CAM when conditions warrant, are promising models. A key objective of these studies is to investigate the possibility of engineering facultative CAM into C3 plants to enable them to weather periods of drought. Plant Physiol. 10.1104/pp.16.01644