Discussion
Which one of the following performs normal C3 photosynthesis when water is available, but switches to crassulacean acid metabolism (CAM) during salt or drought stress?
Answer: A
The plant is Mesembryanthemum crystallinum, the common ice plant.
The ice plant is the classic facultative CAM species. Well watered, it fixes carbon by the ordinary C3 pathway; under salt or drought stress it induces PEP carboxylase and the other CAM enzymes and switches to opening its stomata at night, which saves a great deal of water.
Cynodon dactylon (Bermuda grass) and Eleusine coracana (finger millet, spelt Eleucine in the paper) are C4 grasses, and Hordeum vulgare (barley) is a C3 plant; none of them switches to CAM.
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