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REVIEW

Intracellular transport and pathways of carbon flow in plants with crassulacean acid metabolism

Joseph A. M. Holtum A D , J. Andrew C. Smith B and H. Ekkehard Neuhaus C
+ Author Affiliations
- Author Affiliations

A School of Tropical Biology, James Cook University, Townsville, Qld 4811, Australia.

B Department of Plant Sciences, University of Oxford, South Parks Road, Oxford OX1 3RB, UK.

C Universität Kaiserslautern, Pflanzenphysiologie, Erwin Schrödinger-Strasse, D-67653 Kaiserslautern, Germany.

D Corresponding author. Email: joseph.holtum@jcu.edu.au

E This paper originates from a presentation at the IVth International Congress on Crassulacean Acid Metabolism, Tahoe City, California, USA, July–August 2004

F This paper is dedicated to Professor Dr Erwin Latzko on the occasion of his 80th birthday.

Functional Plant Biology 32(5) 429-449 https://doi.org/10.1071/FP04189
Submitted: 17 October 2004  Accepted: 22 February 2005   Published: 27 May 2005

Abstract

The massive daily reciprocal transfer of carbon between acids and carbohydrates that is unique to crassulacean acid metabolism (CAM) involves extensive and regulated transport of metabolites between chloroplasts, vacuoles, the cytosol and mitochondria. In this review of the CAM pathways of carbon flow and intracellular transport, we highlight what is known and what has been postulated. For three of the four CAM pathway variants currently known (malic enzyme- or PEP carboxykinase-type decarboxylase, and starch- or soluble sugar-type carbohydrate storage), the mechanisms of intracellular transport are still hypothetical and have yet to be demonstrated experimentally. Even in malic enzyme starch-storing species such as Kalanchoë daigremontiana Hamet et Perr. and Mesembryanthemum crystallinum L., the best-described variants of plants with the second-most common mode of photosynthetic carbon metabolism known, no tonoplast or mitochondrial transporter has been functionally described at a molecular level.

Keywords: CAM, photosynthetic carbon metabolism, plant metabolite transport.


Acknowledgments

JAMH was supported by the JCU Special Studies Program. We thank K Winter for constructive comments that improved the quality of the manuscript.


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