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Annals of Botany 88: 457-463, 2001
© 2001 Annals of Botany Company

Chlorophyll Fluorescence and Organic Acid Oscillations during Transition from CAM to C3-photosynthesis inClusia minor L. (Clusiaceae)

Eduardo A. de Mattos+ and Ulrich LÜttge§

Institut für Botanik, Technische Universität Darmstadt, D-64287, Darmstadt, Germany

Received: 31 January 2001 ; Returned for revision: 28 February 2001 . Accepted: 21 May 2001

In species of Clusia, switching from C3-photosynthesis (C3-PS) to crassulacean acid metabolism (CAM) may be a means of optimizing water use, plant carbon balance and photon utilization during periods of stress. We ask whether, in perennial species of Clusia, the switch from CAM back to C3-PS is also of ecophysiological significance. Our objective was to investigate the performance of C. minor L. during a short-term shift from CAM to C3-PS. During the transition from CAM to C3-PS, nocturnal malate and citrate accumulation decreased whereas CO2uptake increased during the daytime. However, after 7 d, marked nocturnal accumulation of citrate and 24 h CO2uptake occurred. In contrast to C3-like photosynthesis, a pronounced reduction in the effective quantum yield of photosystem II, {triangleup}F/F'm, together with a sharp increase in non-photochemical quenching were observed during CAM at the beginning and end of the day. After 7 d, integrated CO2uptake over 24 h approximately doubled; however, water use efficiency was reduced three-fold due to increased rates of daytime transpiration. Despite very similar maximum {triangleup}F/F'mbetween CAM and C3-PS, the results suggest that daily photon utilization increases when there is unrestricted CO2uptake directly from the atmosphere. Thus, under well-watered conditions and with increased rates of transpiration, C. minor performing C3-like photosynthesis may overcome the limitations of the storage capacity of the vacuole for overnight organic acid accumulation, improving its daily carbon balance. Copyright 2001 Annals of Botany Company

Gas exchange, organic acid, vacuoles, photoinhibition, C3-photosynthesis, CAM, Clusia minor


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