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Published on July 9, 2008; 10.1104/pp.108.120410

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Received April 4, 2008
Accepted June 22, 2008

Immunolocalization of solanaceous SUT1 proteins in companion cells and xylem parenchyma: New perspectives for phloem loading and transport

Bianca Schmitt , Ruth Stadler , and Norbert Sauer *

Molekulare Pflanzenphysiologie, Friedrich-Alexander-Universitat Erlangen-Nurnberg, Staudtstrasse 5, D-91058 Erlangen, Germany

* Corresponding author; email: nsauer{at}biologie.uni-erlangen.de.

Leaf sucrose transporters are essential for phloem loading and long-distance partitioning of assimilates in plants that load their phloem from the apoplast. Sucrose loading into the phloem is indispensable for the generation of the osmotic potential difference that drives phloem bulk flow and is central for the long-distance movement of phloem sap compounds, including hormones and signaling molecules. In previous analyses, solanaceous SUT1 sucrose transporters from tobacco, potato and tomato were immunolocalized in plasma membranes of enucleate SEs. Here we present data that identify solanaceous SUT1 proteins with high specificity in phloem CCs. Moreover, comparisons of SUT1 localization in the abaxial and adaxial phloem revealed higher levels of SUT1 protein in the abaxial phloem of all three solanaceous species, suggesting different physiological roles for these two types of phloem. Finally, SUT1 proteins were identified in files of xylem parenchyma cells, mainly in the bicollateral veins. Together, our data provide new insight into the role of SUT1 proteins in solanaceous species.






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