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.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Arabidopsis / cytology
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Arabidopsis / growth & development
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Arabidopsis / metabolism*
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Arabidopsis Proteins / chemistry
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Arabidopsis Proteins / genetics
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Arabidopsis Proteins / metabolism*
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Cell Polarity
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Gravitropism
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Indoleacetic Acids / metabolism*
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Membrane Transport Proteins / chemistry
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Membrane Transport Proteins / genetics
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Membrane Transport Proteins / metabolism*
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Plant Epidermis / cytology
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Plant Epidermis / metabolism*
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Plant Roots / cytology
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Plant Roots / growth & development
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Plant Roots / metabolism*
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Promoter Regions, Genetic
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Recombinant Fusion Proteins / metabolism
Substances
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Arabidopsis Proteins
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Indoleacetic Acids
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Membrane Transport Proteins
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PIN1 protein, Arabidopsis
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PIN2 protein, Arabidopsis
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Recombinant Fusion Proteins