Schmitt B, Stadler R, Sauer N (2008)
Publication Language: English
Publication Status: Published
Publication Type: Journal article, Original article
Publication year: 2008
Book Volume: 148
Pages Range: 187-199
Journal Issue: 1
Open Access Link: http://www.plantphysiol.org/content/148/1/187.long
Leaf sucrose (Suc) transporters are essential for phloem loading and long-distance partitioning of assimilates in plants that load their phloem from the apoplast. Suc 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 Suc transporters from tobacco (Nicotiana tabacum), potato (Solanum tuberosum), and tomato (Solanum lycopersicum) were immunolocalized in plasma membranes of enucleate sieve elements. Here, we present data that identify solanaceous SUT1 proteins with high specificity in phloem companion cells. 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.
APA:
Schmitt, B., Stadler, R., & Sauer, N. (2008). Immunolocalization of solanaceous SUT1 proteins in companion cells and xylem parenchyma: new perspectives for phloem loading and transport. Plant Physiology, 148(1), 187-199. https://dx.doi.org/10.1104/pp.108.120410
MLA:
Schmitt, Bianca, Ruth Stadler, and Norbert Sauer. "Immunolocalization of solanaceous SUT1 proteins in companion cells and xylem parenchyma: new perspectives for phloem loading and transport." Plant Physiology 148.1 (2008): 187-199.
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