title: Polar PIN localization directs auxin flow in plants.
abstract: Polar flow of the phytohormone auxin requires plasma membrane-associated PIN proteins and underlies multiple developmental processes in plants. Here we address the importance of the polarity of subcellular PIN localization for the directionality of auxin transport in Arabidopsis thaliana. Expression of different PINs in the root epidermis revealed the importance of PIN polar positions for directional auxin flow and root gravitropic growth. Interfering with sequence-embedded polarity signals directly demonstrates that PIN polarity is a primary factor in determining the direction of auxin flow in meristematic tissues. This finding provides a crucial piece in the puzzle of how auxin flow can be redirected via rapid changes in PIN polarity.
authors.affiliation: Center for Plant Molecular Biology (ZMBP), Tübingen University, D-72076 Tübingen, Germany.
authors.forename: Justyna
authors.initials: J
authors.lastname: Wisniewska
authors.forename: Jian
authors.initials: J
authors.lastname: Xu
authors.forename: Daniela
authors.initials: D
authors.lastname: Seifertová
authors.forename: Philip B
authors.initials: PB
authors.lastname: Brewer
authors.forename: Kamil
authors.initials: K
authors.lastname: Ruzicka
authors.forename: Ikram
authors.initials: I
authors.lastname: Blilou
authors.forename: David
authors.initials: D
authors.lastname: Rouquié
authors.forename: Eva
authors.initials: E
authors.lastname: Benková
authors.forename: Ben
authors.initials: B
authors.lastname: Scheres
authors.forename: Jirí
authors.initials: J
authors.lastname: Friml
mesh_terms: D017360:Arabidopsis / Q000166:cytology / Q000254:growth & development / Q000378:metabolism*; D029681:Arabidopsis Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D016764:Cell Polarity; D018522:Gravitropism; D007210:Indoleacetic Acids / Q000378:metabolism*; D026901:Membrane Transport Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D019441:Plant Epidermis / Q000166:cytology / Q000378:metabolism*; D018517:Plant Roots / Q000166:cytology / Q000254:growth & development / Q000378:metabolism*; D011401:Promoter Regions, Genetic; D011993:Recombinant Fusion Proteins / Q000378:metabolism
chemical_list: D029681:Arabidopsis Proteins; D007210:Indoleacetic Acids; D026901:Membrane Transport Proteins; D011993:Recombinant Fusion Proteins; C116363:PIN1 protein, Arabidopsis; C117013:AT5G57090 protein, Arabidopsis