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Front. Plant Sci., 18 June 2013 | http://dx.doi.org/10.3389/fpls.2013.00201

Carbon partitioning in sugarcane (Saccharum species)

  • 1FAFU and UIUC SIB Joint Center for Genomics and Biotechnology, Fujian Agriculture and Forestry University, Fuzhou, China
  • 2Agronomy Department, Genetics Institute, University of Florida, Gainesville, FL, USA
  • 3Plant Molecular and Cellular Biology Program, University of Florida, Gainesville, FL, USA
  • 4Horticultural Sciences Department, University of Florida, Gainesville, FL, USA
  • 5Department of Plant Biology, University of Illinois at Urbana-Champaign, Urbana, IL, USA

Focus has centered on C-partitioning in stems of sugarcane (Saccharum sp.) due to their high-sucrose accumulation features, relevance to other grasses, and rising economic value. Here we review how sugarcane balances between sucrose storage, respiration, and cell wall biosynthesis. The specific topics involve (1) accumulation of exceptionally high sucrose levels (up to over 500 mM), (2) a potential, turgor-sensitive system for partitioning sucrose between storage inside (cytosol and vacuole) and outside cells, (3) mechanisms to prevent back-flow of extracellular sucrose to xylem or phloem, (4) apparent roles of sucrose-P-synthase in fructose retrieval and sucrose re-synthesis, (5) enhanced importance of invertases, and (6) control of C-flux at key points in cell wall biosynthesis (UDP-glucose dehydrogenase) and respiration (ATP- and pyrophosphate-dependent phosphofructokinases). A combination of emerging technologies is rapidly enhancing our understanding of these points and our capacity to shift C-flux between sucrose, cell wall polymers, or other C-sinks.

Keywords: sugarcane, carbon partitioning, source-sink system, sucrose, cellulose, phloem, invertase, UDP-glucose

Citation: Wang J, Nayak S, Koch K and Ming R (2013) Carbon partitioning in sugarcane (Saccharum species). Front. Plant Sci. 4:201. doi: 10.3389/fpls.2013.00201

Received: 01 April 2013; Accepted: 29 May 2013;
Published online: 18 June 2013.

Edited by:

Maurice Bosch, Aberystwyth University, UK

Reviewed by:

Graham Bonnett, Commonwealth Scientific and Industrial Research Organisation, Australia
Frikkie C. Botha, BSES Limited, Australia

Copyright: © 2013 Wang, Nayak, Koch and Ming. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in other forums, provided the original authors and source are credited and subject to any copyright notices concerning any third-party graphics etc.

*Correspondence: Jianping Wang, Agronomy Department, Genetics Institute, University of Florida, 337 Cancer and Genetics Research Complex, 2033 Mowry road, Gainesville, FL 32610, USA e-mail: wangjp@ufl.edu