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Plant Physiology 61:327-330 (1978)
© 1978 American Society of Plant Biologists

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Articles

Responses of Succulents to Plant Water Stress 1

Zac Hanscom, III2 and Irwin P. Ting

Department of Biology, University of California, Riverside, California 92521

Experiments were performed to test the hypothesis that succulents "shift" their method of photosynthetic metabolism in response to environmental change. Our data showed that there were at least three different responses of succulents to plant water status. When plant water status of Portulacaria afra (L.) Jacq. was lowered either by withholding water or by irrigating with 2% NaCl, a change from C3-photosynthesis to Crassulacean acid metabolism (CAM) occurred. Fluctuation of titratable acidity and nocturnal CO2 uptake was induced in the stressed plants. Stressed Peperomia obtusifolia A. Dietr. plants showed a change from C3-photosynthesis to internal cycling of CO2. Acid fluctuation commenced in response to stress but exogenous CO2 uptake did not occur. Zygocactus truncatus Haworth plants showed a pattern of acid fluctuation and nocturnal CO2 uptake typical of CAM even when well irrigated. The cacti converted from CAM to an internal CO2 cycle similar to Peperomia when plants were water-stressed. Reverse phase gas exchange in succulents results in low water loss to carbon gain. Water is conserved and low levels of metabolic activity are maintained during drought periods by complete stomatal closure and continual fluctuation of organic acids.

2 Department of Biology, San Diego State University, San Diego, California 92182.

1 Supported in part by National Science Foundation Grant OIP 74-15673.






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Copyright © 1978 by the American Society of Plant Biologists