TAILIEUCHUNG - Báo cáo khoa hoc : Anion channels in plant cells

Plant anion channels allow the efflux of anions from cells. They are involved in turgor pressure control, changes in membrane potential, organic acid excretion, tolerance to salinity and inorganic anion nutrition. | fFEBS Journal MINIREVIEW Anion channels in plant cells Hannes Kollist1 Mathieu dossier2 Kristiina Laanemets1 and Sébastien Thomine2 1 Institute of Technology University of Tartu Estonia 2 Institut des Sciences du Vegetal CNRS Gif-sur-Yvette France Keywords ALMT1 ion channel root SLAC1 stomata Correspondence S. Thomine Institut des Sciences du Végétal CNRS Avenue de la Terrasse 91 198 Gif-sur-Yvette France Fax 33 1 69 82 37 68 Tel 33 1 69 82 37 93 E-mail thomine@ Received 28 April 2011 revised 13 July 2011 accepted 25 July 2011 doi Plant anion channels allow the efflux of anions from cells. They are involved in turgor pressure control changes in membrane potential organic acid excretion tolerance to salinity and inorganic anion nutrition. The recent molecular identification of anion channel genes in guard cells and in roots allows a better understanding of their function and of the mechanisms that control their activation. Introduction The role of anions in plant cells is clearly distinct from that encountered in animal cells. First chloride is by far the most prevalent anion in animal cells whereas plant cells contain a complex mixture of diverse anions including besides chloride nitrate sulfate phosphate and organic anions such as citrate malate or oxalate in varying proportions 1 . Second anions are accumulated in plant cells whereas in most animal cells the chloride gradient favors the influx. Third in mature plant cells the main reservoir of ions is not the cytosol but rather the central vacuole which occupies about 80 of the cell volume. These differences imply original functions for plant anion channels and probably account for the recent discovery of anion channel gene families unique to plants and not found in animal genomes. Ion channels switch between open and closed states according to the factors that control their gating. When an ion channel is open massive ion fluxes occur according to their .

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