Variable Photosynthetic Metabolism in Leaves and Stems of Cissus quadrangularis L |
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| Authors: | Ting I P Sternberg L O Deniro M J |
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| Affiliation: | Department of Botany and Plant Sciences, University of California, Riverside, California 92521. |
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| Abstract: | By measuring titratable acidity, gas exchange parameters, mesophyll succulence, and 13C/12C ratios, we have shown that Cissus quadrangularis L. has C3-like leaves and stems with Crassulacean acid metabolism (CAM). In addition, the nonsucculent leaves show the diurnal fluctuations in organic acids termed recycling despite the fact that all CO2 uptake and stomatal opening occurs during the day. Young succulent stems have more C3 photosynthesis than older stems, but both have characteristics of CAM. The genus Cissus will be a fruitful group to study the physiology, ecology, and evolution of C3 and CAM since species occur that exhibit characteristics of both photosynthetic pathways. |
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