Chlorophyll Fluorescence and Organic Acid Oscillations during Transition from CAM to C3-photosynthesis inClusia minor L. (Clusiaceae) |
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Authors: | de Mattos, Eduardo A. LUttge, Ulrich |
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Affiliation: | Institut für Botanik, Technische Universität Darmstadt, D-64287, Darmstadt, Germany |
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Abstract: | In species of Clusia, switching from C3-photosynthesis (C3-PS)to crassulacean acid metabolism (CAM) may be a means of optimizingwater use, plant carbon balance and photon utilization duringperiods of stress. We ask whether, in perennial species of Clusia,the switch from CAM back to C3-PS is also of ecophysiologicalsignificance. Our objective was to investigate the performanceof C. minor L. during a short-term shift from CAM to C3-PS.During the transition from CAM to C3-PS, nocturnal malate andcitrate accumulation decreased whereas CO2uptake increased duringthe daytime. However, after 7 d, marked nocturnal accumulationof citrate and 24 h CO2uptake occurred. In contrast to C3-likephotosynthesis, a pronounced reduction in the effective quantumyield of photosystem II, |
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