Journal Article10.1146/ANNUREV.ARPLANT.58.032806.103805
Auxin: The Looping Star in Plant Development
René Benjamins,Ben Scheres +1 more
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TL;DR: This review focuses on the feedback loops that form an integrative part of these regulatory mechanisms in the phytohormone auxin and their role in plant growth and development.
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Abstract: The phytohormone auxin is a key factor in plant growth and development. Forward and reverse genetic strategies have identified important molecular components in auxin perception, signaling, and transport. These advances resulted in the identification of some of the underlying regulatory mechanisms as well as the emergence of functional frameworks for auxin action. This review focuses on the feedback loops that form an integrative part of these regulatory mechanisms.
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Citations
The heterotrimeric G protein β subunit RGB1 is required for seedling formation in rice.
Yun Gao,Houwen Gu,Mamotshewa Leburu,Xuhui Li,Yan Wang,Jiayan Sheng,Huimin Fang,Minghong Gu,Guohua Liang +8 more
TL;DR: The rgb1 mutants provide an ideal material for exploring the molecular mechanism underlying rice seedling formation during early postgermination development by G proteins, and transcript profiling analysis revealed that a large number of auxin-, cytokinin-, and brassinosteroid-inducible genes was upregulated or downregulated in the rgb1 mutant compared to the wild type during seedling development.
A DII Domain-Based Auxin Reporter Uncovers Low Auxin Signaling during Telophase and Early G1.
Ricardo Mir,Leslie Z. Aranda,Tiffany Biaocchi,Anding Luo,Anne W. Sylvester,Carolyn G. Rasmussen +5 more
TL;DR: Low levels of DII-specific fluorescence corresponding to high endogenous auxin signaling occurred near vasculature tissue and the outer layer and glume primordia of spikelet pair meristems and floral meristem, respectively.
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Adaptation of root growth to increased ambient temperature requires auxin and ethylene coordination in Arabidopsis.
TL;DR: It is found that the Arabidopsis ckrc1-1 mutant is sensitive to higher AT, and CKRC1-dependent auxin biosynthesis was critical for maintaining PIN1, PIN2, and AUX1 expression at elevated temperatures.
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Theoretical Investigation of Positional Substitution and Solvent Effects on n-Cyanoindole Fluorescent Probes.
TL;DR: It is found that substitution of the cyano group on different positions of indole has diverse effects on the absorption and fluorescence spectra in water solvent, and it is predicted that the relatively high fluorescence intensity of 4-cyanoindole in aqueous solution results from minimization of radiationless decay pathways, since both absorption andfluorescence occur from the lowest excited state.
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Auxin gradient is crucial for the maintenance of root distal stem cell identity in Arabidopsis.
TL;DR: Evidence is provided to show that an optimal auxin maximum in QC guided auxin signaling gradient in root tips is crucial for maintaining root DSC identity.
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References
Local, Efflux-Dependent Auxin Gradients as a Common Module for Plant Organ Formation
Eva Benková,Marta Michniewicz,Michael Sauer,Thomas Teichmann,Daniela Seifertová,Gerd Jürgens,Jiří Friml +6 more
TL;DR: It is shown that organ formation in Arabidopsis involves dynamic gradients of the signaling molecule auxin with maxima at the primordia tips, which suggest that PIN-dependent, local auxin gradients represent a common module for formation of all plant organs, regardless of their mature morphology or developmental origin.
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The F-box protein TIR1 is an auxin receptor
TL;DR: TIR1 is an auxin receptor that mediates Aux/IAA degradation and auxin-regulated transcription and the loss of TIR1 and three related F-box proteins eliminates saturable auxin binding in plant extracts.
2K
Aux/IAA proteins repress expression of reporter genes containing natural and highly active synthetic auxin response elements.
TL;DR: Cotransfection experiments with natural and synthetic AuxRE reporter genes and effector genes encoding Aux/IAA proteins showed that overexpression of Aux/ IAA proteins in carrot protoplasts resulted in specific repression of TGTCTC Auxre reporter gene expression.
2K
The PIN auxin efflux facilitator network controls growth and patterning in Arabidopsis roots
Ikram Blilou,Jian Xu,Marjolein Wildwater,Viola Willemsen,Ivan A. Paponov,Jiří Friml,Renze Heidstra,Mitsuhiro Aida,Klaus Palme,Ben Scheres +9 more
TL;DR: This work shows that five PIN genes collectively control auxin distribution to regulate cell division and cell expansion in the primary root and reveals an interaction network of auxin transport facilitators and root fate determinants that control patterning and growth of the root primordium.
Efflux-dependent auxin gradients establish the apical–basal axis of Arabidopsis
Jiří Friml,Anne Vieten,Michael Sauer,Dolf Weijers,Dolf Weijers,Heinz Schwarz,Thorsten Hamann,Thorsten Hamann,Remko Offringa,Gerd Jürgens +9 more
TL;DR: The results indicate how the establishment of cell polarity, polar auxin efflux and local auxin response result in apical–basal axis formation of the embryo, and thus determine the axiality of the adult plant.
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