title: Molecular biology of K+ transport across the plant cell membrane: what do we learn from comparison between plant species?
abstract: Cloning and characterizations of plant K(+) transport systems aside from Arabidopsis have been increasing over the past decade, favored by the availability of more and more plant genome sequences. Information now available enables the comparison of some of these systems between species. In this review, we focus on three families of plant K(+) transport systems that are active at the plasma membrane: the Shaker K(+) channel family, comprised of voltage-gated channels that dominate the plasma membrane conductance to K(+) in most environmental conditions, and two families of transporters, the HAK/KUP/KT K(+) transporter family, which includes some high-affinity transporters, and the HKT K(+) and/or Na(+) transporter family, in which K(+)-permeable members seem to be present in monocots only. The three families are briefly described, giving insights into the structure of their members and on functional properties and their roles in Arabidopsis or rice. The structure of the three families is then compared between plant species through phylogenic analyses. Within clusters of ortologues/paralogues, similarities and differences in terms of expression pattern, functional properties and, when known, regulatory interacting partners, are highlighted. The question of the physiological significance of highlighted differences is also addressed.
authors.affiliation: Biochimie & Physiologie Moléculaire des Plantes, UMR 5004 CNRS/386 INRA/SupAgro Montpellier/Université Montpellier 2, Campus SupAgro-INRA, 34060 Montpellier Cedex 2, France. Electronic address: very@supagro.inra.fr.
authors.forename: Anne-Aliénor
authors.initials: AA
authors.lastname: Véry
authors.affiliation: Biochimie & Physiologie Moléculaire des Plantes, UMR 5004 CNRS/386 INRA/SupAgro Montpellier/Université Montpellier 2, Campus SupAgro-INRA, 34060 Montpellier Cedex 2, France.
authors.forename: Manuel
authors.initials: M
authors.lastname: Nieves-Cordones
authors.affiliation: Biochimie & Physiologie Moléculaire des Plantes, UMR 5004 CNRS/386 INRA/SupAgro Montpellier/Université Montpellier 2, Campus SupAgro-INRA, 34060 Montpellier Cedex 2, France; Laboratoire d'Ecologie et d'Environnement, Faculté des Sciences Ben M'sik, Université Hassan II-Mohammedia, Avenue Cdt Driss El Harti, BP 7955, Sidi Othmane, Casablanca, Morocco.
authors.forename: Meriem
authors.initials: M
authors.lastname: Daly
authors.affiliation: Biochimie & Physiologie Moléculaire des Plantes, UMR 5004 CNRS/386 INRA/SupAgro Montpellier/Université Montpellier 2, Campus SupAgro-INRA, 34060 Montpellier Cedex 2, France; Department of Agronomy, University of Agriculture, Faisalabad, Pakistan.
authors.forename: Imran
authors.initials: I
authors.lastname: Khan
authors.affiliation: Biochimie & Physiologie Moléculaire des Plantes, UMR 5004 CNRS/386 INRA/SupAgro Montpellier/Université Montpellier 2, Campus SupAgro-INRA, 34060 Montpellier Cedex 2, France.
authors.forename: Cécile
authors.initials: C
authors.lastname: Fizames
authors.affiliation: Biochimie & Physiologie Moléculaire des Plantes, UMR 5004 CNRS/386 INRA/SupAgro Montpellier/Université Montpellier 2, Campus SupAgro-INRA, 34060 Montpellier Cedex 2, France.
authors.forename: Hervé
authors.initials: H
authors.lastname: Sentenac
mesh_terms: D001692:Biological Transport; D002462:Cell Membrane / Q000378:metabolism; D018506:Gene Expression Regulation, Plant; D008954:Models, Biological; D009928:Organ Specificity; D010802:Phylogeny; D010940:Plant Proteins / Q000378:metabolism; D010944:Plants / Q000235:genetics* / Q000378:metabolism; D011188:Potassium / Q000378:metabolism*; D015221:Potassium Channels / Q000378:metabolism*; D051637:Shaker Superfamily of Potassium Channels / Q000378:metabolism; D000254:Sodium-Potassium-Exchanging ATPase / Q000378:metabolism*; D013045:Species Specificity
chemical_list: D010940:Plant Proteins; D015221:Potassium Channels; D051637:Shaker Superfamily of Potassium Channels; D000254:Sodium-Potassium-Exchanging ATPase; D011188:Potassium
keywords: Dicots/monocots; HAK/KUP/KT transporters; HKT transporters; K(+) transport; Shaker channels