The photosynthetic specialisation of Crassulacean acid metabolism (CAM) operates via a diel separation of carboxylation processes mediated by phosphoenolpyruvate carboxylase (PEPC) and Rubisco which optimise photosynthetic performance and carbon gain in potentially limiting environments. Carbohydrates are a key limiting factor for nocturnal CO2 uptake in CAM plants, and the partitioning of sugars towards providing substrate for dark carboxylation must be balanced with the requirements of other competing sinks that include growth and export. Sugar transporters have been recognised previously as key targets for regulatory roles in the long-distance and subcellular distribution and partitioning of assimilates in plants. Thus, in CAM plants, sugar transporters may represent a strategic checkpoint for regulating the partitioning of photosynthetically fixed carbon between provision of substrate for nocturnal carboxylation and export for growth. In this review, we examine the major pathways underpinning sugar flux in CAM plants and describe the requirements for sugar transport across the chloroplastic and vacuolar membranes as well as for long-distance transport in the phloem. We review current knowledge on the structure, function and regulation of plant sugar transporters and highlight candidate sugar transporters that could play cardinal roles in regulating carbohydrate partitioning between the potentially conflicting fates of storage for CAM and for growth and productivity.
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Antony, E., Borland, A.M. (2009). The Role and Regulation of Sugar Transporters in Plants with Crassulacean Acid Metabolism. In: Lüttge, U., Beyschlag, W., Büdel, B., Francis, D. (eds) Progress in Botany. Progress in Botany, vol 70. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-68421-3_6
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