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First published online January 22, 2004; 10.1104/pp.103.033399

Plant Physiology 134:684-693 (2004)
© 2004 American Society of Plant Biologists

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CELL BIOLOGY AND SIGNAL TRANSDUCTION

Wounding Enhances Expression of AtSUC3, a Sucrose Transporter from Arabidopsis Sieve Elements and Sink Tissues1

Stefan Meyer2, Christian Lauterbach2, Matthias Niedermeier, Inga Barth, Richard D. Sjolund and Norbert Sauer*

Universität Erlangen-Nürnberg, Molekulare Pflanzenphysiologie, D–91058 Erlangen, Germany (S.M., C.L., M.N., I.B., N.S.); and Department of Biological Sciences, University of Iowa, Iowa City, Iowa 52242 (R.D.S.)

The Arabidopsis AtSUC3 gene encodes a sucrose (Suc) transporter that differs in size and intron number from all other Arabidopsis Suc transport proteins. Each plant species analyzed so far possesses one transporter of this special type, and several functions have been discussed for these proteins, including the catalysis of transmembrane Suc transport, and also Suc sensing and regulation of other Suc transporters. Here, we show that the AtSUC3 protein is localized in the sieve elements of the Arabidopsis phloem and is not colocalized with the companion cell-specific AtSUC2 phloem loader. Even stronger AtSUC3 expression is observed in numerous sink cells and tissues, such as guard cells, trichomes, germinating pollen, root tips, the developing seed coat, or stipules. Moreover, AtSUC3 expression is strongly induced upon wounding of Arabidopsis tissue. The physiological role of AtSUC3 in these different cells and tissues is discussed.

Article, publication date, and citation information can be found at www.plantphysiol.org/cgi/doi/10.1104/pp.103.033399.

1 This work was supported by the Deutsche Forschungsgemeinschaft (grant no. SPP 1108–Sa 382/12–1).

2 These authors contributed equally to this work.

* Corresponding author; e-mail nsauer{at}biologie.uni-erlangen.de; fax 49–9131–85–28751.

Received September 16, 2003; returned for revision October 5, 2003; accepted November 19, 2003.


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