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Science 28 February 1997:
Vol. 275. no. 5304, pp. 1298 - 1300
DOI: 10.1126/science.275.5304.1298
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Reports

Macromolecular Trafficking Indicated by Localization and Turnover of Sucrose Transporters in Enucleate Sieve Elements

Christina Kühn, Vincent R. Franceschi, Alexander Schulz, Rémi Lemoine, Wolf B. Frommer *

The leaf sucrose transporter SUT1 is essential for phloem loading and long-distance transport of assimilates. Both SUT1 messenger RNA (mRNA) and protein were shown to be diurnally regulated and to have high turnover rates. SUT1 protein was detected by immunolocalization in plasma membranes of enucleate sieve elements (SEs) in tobacco, potato, and tomato. Analysis by in situ hybridization showed that SUT1 mRNA localizes mainly to the SE and is preferentially associated with plasmodesmata. Antisense inhibition of SUT1 expression under control of a companion cell (CC)-specific promoter indicated synthesis of SUT1 mRNA in the CC. These results provide evidence for targeting of plant endogenous mRNA and potentially SUT1 protein through phloem plasmodesmata and for sucrose loading at the plasma membrane of SE.

C. Kühn and W. B. Frommer, Institut für Botanik, Eberhard-Karls-Universität, Auf der Morgenstelle 1, D-72076 Tübingen, Germany.
A. Schulz, Botanisches Institut, Christian-Albrechts-Universität zu Kiel, Olshausenstr. 40, D-24098 Kiel, Germany.
V. R. Franceschi, Electron Microscopy Center, Washington State University, Pullman, WA 99164-4210, USA.
R. Lemoine, Laboratoire de Physiologie et Biochimie Végétales, URA CNRS 574, Université de Poitiers, Poitiers, France.
*   To whom correspondence should be addressed.

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C.-a. Matsukura, T. Saitoh, T. Hirose, R. Ohsugi, P. Perata, and J. Yamaguchi (2000)
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PLANT CELL 12, 1345-1356
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SUT2, a Putative Sucrose Sensor in Sieve Elements.
L. Barker, C. Kühn, A. Weise, A. Schulz, C. Gebhardt, B. Hirner, H. Hellmann, W. Schulze, J. M. Ward, and W. B. Frommer (2000)
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Development 126, 4405-4419
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Plant Paralog to Viral Movement Protein That Potentiates Transport of mRNA into the Phloem.
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PLANT CELL 11, 127-140
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Characterization of Source- and Sink-Specific Sucrose/H+ Symporters from Carrot.
R. Shakya and A. Sturm (1998)
Plant Physiology 118, 1473-1480
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Developmental Regulation of Intercellular Protein Trafficking through Plasmodesmata in Tobacco Leaf Epidermis.
A. Itaya, Y.-M. Woo, C. Masuta, Y. Bao, R. S. Nelson, and B. Ding (1998)
Plant Physiology 118, 373-385
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The H+-Sucrose Cotransporter NtSUT1 Is Essential for Sugar Export from Tobacco Leaves.
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Plant Physiology 118, 59-68
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J. M.-Y. Lu and D. R. Bush (1998)
PNAS 95, 9025-9030
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Sucrose is a signal molecule in assimilate partitioning.
T.-J. Chiou and D. R. Bush (1998)
PNAS 95, 4784-4788
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The Movement Protein of Cucumber Mosaic Virus Traffics into Sieve Elements in Minor Veins of Nicotiana clevelandii.
L. M. Blackman, P. Boevink, S. S. Cruz, P. Palukaitis, and K. J. Oparka (1998)
PLANT CELL 10, 525-538
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Phloem sap proteins from Cucurbita maxima and Ricinus communis have the capacity to traffic cell to cell through plasmodesmata.
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PNAS 94, 14150-14155
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Cell-cell interactions during plant development..
S Hake and B R Char (1997)
Genes & Dev. 11, 1087-1097
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Characterization of Cucurbita maxima Phloem Serpin-1 (CmPS-1). A DEVELOPMENTALLY REGULATED ELASTASE INHIBITOR.
B.-C. Yoo, K. Aoki, Y. Xiang, L. R. Campbell, R. J. Hull, B. Xoconostle-Cazares, J. Monzer, J.-Y. Lee, D. E. Ullman, and W. J. Lucas (2000)
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Genetic evidence for the in planta role of phloem-specific plasma membrane sucrose transporters.
J. R. Gottwald, P. J. Krysan, J. C. Young, R. F. Evert, and M. R. Sussman (2000)
PNAS 97, 13979-13984
   Abstract »    Full Text »    PDF »


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