crassulacean acid metabolism

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crassulacean acid metabolism

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crassulacean acid metabolism (CAM)

a method of PHOTOSYNTHESIS found in certain succulent plants (members of the family Crassulaceae) that live in hot, dry climates and close their stomata during the day to avoid excessive TRANSPIRATION losses and open them at night. During the night CO2 is taken in and stored as organic acids (e.g. malic acid); during the day the CO2 is released from the organic acids and used in the CALVIN CYCLE.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
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luridum seems to be many times lower than the content found in plants having the CAM pathway, suggesting the absence of CAM pathway in E.
For example, the tropical African species of Euphorbia use the CAM pathway, while the subtropical North American species of the same genus use the [C.sub.4] pathway.
In addition, other nutrients are scarce in these infertile habitats, and the CAM pathway potentially could enhance nitrogen-use efficiency (Griffiths, 1989; Robe & Griffiths, 1994).