Ecological Studies Volume 114, 1996, pp 427-436

Taxonomic Distribution of Crassulacean Acid Metabolism

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The list presented in Table 26.1 summarizes the available information on the taxonomic occurrence of the CAM pathway. Details of the methods used to detect CAM activity can be found in the original publications: these have included nocturnal increases in malic-acid content, nocturnal CO2 uptake, or carbon-isotope composition (see p. 5). The latter has been particularly useful in taxonomic surveys, since it can be applied to dried plant material from herbarium collections, and modern mass spectrometers can provide adequate signals from as little as 1 mg of plant dry matter.