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

Journal article
(Original article)


Publication Details

Author(s): Schmitt B, Stadler R, Sauer N
Journal: Plant Physiology
Publication year: 2008
Volume: 148
Journal issue: 1
Pages range: 187-199
ISSN: 0032-0889
Language: English


Abstract


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.



FAU Authors / FAU Editors

Sauer, Norbert Prof. Dr.
Lehrstuhl für Molekulare Pflanzenphysiologie
Stadler, Ruth PD Dr.
Lehrstuhl für Molekulare Pflanzenphysiologie


How to cite

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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Last updated on 2018-08-08 at 02:10