J. Membrane Biol. 162, 177–190 (1998) The Journal of Membrane Biology © Springer-Verlag New York Inc. 1998 Topical Review Structure and Function of Plasma Membrane Amino Acid, Oligopeptide and Sucrose Transporters from Higher Plants 1 2 1 D. Rentsch , K.J. Boorer , W.B. Frommer Botanical Institute, Eberhard-Karls-University, Auf der Morgenstelle 1, D-72076 Tu ¨ bingen, Germany Department of Physiology, UCLA School of Medicine, 10833 Le Conte Ave, Los Angeles, CA 90095, USA Received: 27 June 1997/Revised: 18 September 1997 Introduction or flowers that depend on external supplies. The two vascular systems responsible for long distance transport are the xylem and the phloem. Phloem cells remain alive As differentiated multicellular organisms, plants require at maturity, forming living conduits, in contrast to xylem, ways to exchange signals and metabolites between indi- in which long distance transport can be considered as vidual cells, tissues and organs. Plants have developed a extracellular. Within the phloem sap, the disaccharide set of at least three transport routes for uptake or cell- sucrose (or derivatives) serves as the major transport to-cell transport of solutes: (i) direct intercellular con- metabolite, whereas animals use mainly glucose. The nections such as plasmodesmata (ii) endo/exocytosis, second most abundant class
The Journal of Membrane Biology – Springer Journals
Published: Apr 1, 1998
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