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- W2329595724 abstract "Auxin efflux carrier PIN proteins have been intensively investigated as they are the first polar cargos to be identified in plants with a direct relevance for plant patterning. Based on their polar localization; PIN proteins direct the intercellular flow of signaling molecule auxin and thus bear a rate limiting effect on the formation of auxin activity gradients. With this influence on directionality and extent of auxin transport PINs play crucial roles in plant body organization. Many factors such as vesicle trafficking regulator ARF-GEF GNOM, a kinase PINOID, a retromer complex and membrane sterol composition influence polar PIN localization. Recent work uncovers the mechanism that generates default PIN polarity. Real time PIN tracking reveals that PIN polarity is generated from initially non-polar secretion via endocytosis and subsequent polar recycling. In addition, the Rab5 endocytic pathway emerges to be important for polar PIN localization as Rab5 interference causes non-polar distribution of PINs. This non-polar distribution of PINs during embryogenesis transiently alters auxin activity gradients and changes organ identity by transforming embryonic leaf cells to root fates. These findings for the first time link PIN polarity-based auxin activity gradient to cell fate decisions and thus demonstrate morphogen (a substance influencing cell fates on its concentration gradient) characters of auxin. They also suggest an auxin activity distribution-dependent sensing module that executes differential apical and basal developmental program during plant embryogenesis." @default.
- W2329595724 created "2016-06-24" @default.
- W2329595724 creator A5006428244 @default.
- W2329595724 date "2009-03-01" @default.
- W2329595724 modified "2023-10-09" @default.
- W2329595724 title "Cell polarity in plants" @default.
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- W2329595724 doi "https://doi.org/10.4161/cib.7715" @default.
- W2329595724 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2686378" @default.
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- W2329595724 hasPublicationYear "2009" @default.
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