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Annals of Botany 74: 457-463, 1994
© 1994 Annals of Botany Company

Crassulacean Acid Metabolism in Three Species of Commelinaceae

Craig E. Martin, Dennis A. Gravatt and Valerie S. Loeschen

Department of Botany, University of Kansas, Lawrence, Kansas 66045-2106, USA

Diurnal patterns of CO2 exchange and fluctuations of tissue malic acid concentrations were investigated in three species of Commelinaceae: Callisia fragrans and Tripogandra multiflora from Jamaica, and Tradescantia brevifolia from southern Texas. Very low levels of CAM gas exchange were induced by drought stress in C. fragrans and T. multiflora. In addition, past indications of CAM-cycling in the two Jamaican species were confirmed in drought-stressed plants; however, only C. fragrans exhibited CAM-cycling under well-watered conditions. CAM-cycling under drought stress was also found in T. brevifolia. This constitutes the first report of CAM (sensu lato) in the genus Tradescantia. The importance of low-level CAM in these three species is discussed as a potential adaptation to drought.Copyright 1994, 1999 Academic Press

Callisia fragrans, Tradescantia brevifolia, Tripogandra multiflora, Commelinaceae, CO2 exchange, Crassulacean acid metabolism, CAM-cycling, CAM-idling, drought stress, malic acid fluctuations


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A. Herrera
Crassulacean acid metabolism and fitness under water deficit stress: if not for carbon gain, what is facultative CAM good for?
Ann. Bot., February 1, 2009; 103(4): 645 - 653.
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