title: Transport mechanisms for organic forms of carbon and nitrogen between source and sink.
abstract: Sugars and amino acids are generated in plants by assimilation from inorganic forms. Assimilated forms cross multiple membranes on their way from production sites to storage or use locations. Specific transport systems are responsible for vacuolar uptake and release, for efflux from the cells, and for uptake into the vasculature. Detailed phylogenetic analyses suggest that only proton-coupled cotransporters involved in phloem loading have been identified to date, whereas systems for vacuolar transport and efflux still await identification. Novel imaging approaches may provide the means to characterize the cellular events and elucidate whole plant control of assimilate partitioning and allocation.
authors.affiliation: ZMBP Plant Physiology, D-72076 Tübingen, Germany. sylvie.lalonde@zmbp.uni-tuebingen.de
authors.forename: Sylvie
authors.initials: S
authors.lastname: Lalonde
authors.forename: Daniel
authors.initials: D
authors.lastname: Wipf
authors.forename: Wolf B
authors.initials: WB
authors.lastname: Frommer
mesh_terms: D000596:Amino Acids / Q000096:biosynthesis; D050260:Carbohydrate Metabolism; D002244:Carbon / Q000378:metabolism*; D006801:Humans; D009584:Nitrogen / Q000378:metabolism*; D009930:Organic Chemicals / Q000378:metabolism*; D010455:Peptides / Q000378:metabolism; D010944:Plants / Q000378:metabolism*; D013395:Sucrose / Q000378:metabolism; D014617:Vacuoles / Q000378:metabolism
chemical_list: D000596:Amino Acids; D009930:Organic Chemicals; D010455:Peptides; D013395:Sucrose; D002244:Carbon; D009584:Nitrogen