Proton-Coupled Sugar and Amino Acid Transporters in Plants

Proton-Coupled Sugar and Amino Acid Transporters in Plants / Plants contain many heterotrophic tissue systems that are dependent upon sugar and amino acid import for normal growth and development. Indeed, BUSH every cell of the higher plant is at least transiently heterotrophic during early stages of differentiation. In general, oxidized forms of carbon and nitrogen are reductively assimilated in the photosynthetic tissues of the plant, and sucrose and amino acids are subsequently transported to the heterotrophic cells. The impact of these import-dependent tissues on the overall economy of the plant is considerable. For example, as much as nonphotosynthetic cells 80% of the carbon assimilated during photosynthesis is exported from the leaf to satisfy the metabolic needs of the (64). A central feature of this resource-partitioning (13, 40, 133). Thus, sugar transporters are step is phloem loading, and in many plants this process is dependent upon the function of an active sucrose carrier important contributors in both the systemic distribution of photoassimilate, as well as in the nutritional well being of the individual cell. Additional physio­ logical processes in which sugar and amino acid transport are essential activi­ ties include: seed filling, germination and seedling growth, filling and mobili­ zation in specialized storage organs, and secretion by http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Annual Review of Plant Biology Annual Reviews

Proton-Coupled Sugar and Amino Acid Transporters in Plants

Annual Review of Plant Biology, Volume 44 (1) – Jun 1, 1993

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Publisher
Annual Reviews
Copyright
Copyright 1993 Annual Reviews. All rights reserved
Subject
Review Articles
ISSN
1040-2519
DOI
10.1146/annurev.pp.44.060193.002501
Publisher site
See Article on Publisher Site

Abstract

/ Plants contain many heterotrophic tissue systems that are dependent upon sugar and amino acid import for normal growth and development. Indeed, BUSH every cell of the higher plant is at least transiently heterotrophic during early stages of differentiation. In general, oxidized forms of carbon and nitrogen are reductively assimilated in the photosynthetic tissues of the plant, and sucrose and amino acids are subsequently transported to the heterotrophic cells. The impact of these import-dependent tissues on the overall economy of the plant is considerable. For example, as much as nonphotosynthetic cells 80% of the carbon assimilated during photosynthesis is exported from the leaf to satisfy the metabolic needs of the (64). A central feature of this resource-partitioning (13, 40, 133). Thus, sugar transporters are step is phloem loading, and in many plants this process is dependent upon the function of an active sucrose carrier important contributors in both the systemic distribution of photoassimilate, as well as in the nutritional well being of the individual cell. Additional physio­ logical processes in which sugar and amino acid transport are essential activi­ ties include: seed filling, germination and seedling growth, filling and mobili­ zation in specialized storage organs, and secretion by

Journal

Annual Review of Plant BiologyAnnual Reviews

Published: Jun 1, 1993

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