Polar PIN localization directs auxin flow in plants Journal Article

Author(s): Wiśniewska, Justyna; Xu, Jian; Seifertová, Daniela; Brewer, Philip B; Růžička, Kamil; Blilou, Ikram; Rouquié, David; Benková, Eva; Scheres, Ben; Friml, Jiří
Article 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.
Keywords: plant roots; Recombinant Fusion Proteins; Cell polarity; Gravitropism; Arabidopsis; Arabidopsis Proteins; Indoleacetic Acids; Membrane Transport Proteins; Plant Epidermis; Promoter Regions (Genetics)
Journal Title: Science
Volume: 312
Issue 5775
ISSN: 0036-8075
Publisher: American Association for the Advancement of Science  
Date Published: 2006-05-12
Start Page: 883
DOI: 10.1126/science.1121356
Open access: no