Auxin‐induced actin cytoskeleton rearrangements require AUX1

Arieti, Ruthie S.; Staiger, Christopher J.

doi:10.1111/nph.16382

Auxin‐induced actin cytoskeleton rearrangements require AUX1

Journal Article · Tue Feb 11 00:00:00 EST 2020 · New Phytologist

DOI:https://doi.org/10.1111/nph.16382· OSTI ID:1599228

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Department of Biological Sciences Purdue University West Lafayette IN 47907‐2064 USA, Purdue University Interdisciplinary Life Sciences Graduate Program (PULSe) Purdue University West Lafayette IN 47907 USA, Center for Plant Biology Purdue University West Lafayette IN 47907 USA
Department of Biological Sciences Purdue University West Lafayette IN 47907‐2064 USA, Center for Plant Biology Purdue University West Lafayette IN 47907 USA, Department of Botany and Plant Pathology Purdue University West Lafayette IN 47907 USA

Summary

The actin cytoskeleton is required for cell expansion and implicated in cellular responses to the phytohormone auxin. However, the mechanisms that coordinate auxin signaling, cytoskeletal remodeling and cell expansion are poorly understood. Previous studies examined long‐term actin cytoskeleton responses to auxin, but plants respond to auxin within minutes. Before this work, an extracellular auxin receptor – rather than the auxin transporter AUXIN RESISTANT 1 (AUX1) – was considered to precede auxin‐induced cytoskeleton reorganization.

In order to correlate actin array organization and dynamics with degree of cell expansion, quantitative imaging tools established baseline actin organization and illuminated individual filament behaviors in root epidermal cells under control conditions and after indole‐3‐acetic acid (IAA) application. We evaluated aux1 mutant actin organization responses to IAA and the membrane‐permeable auxin 1‐naphthylacetic acid (NAA).

Cell length predicted actin organization and dynamics in control roots; short‐term IAA treatments stimulated denser and more parallel, longitudinal arrays by inducing filament unbundling within minutes. Although AUX1 is necessary for full actin rearrangements in response to auxin, cytoplasmic auxin (i.e. NAA) stimulated a lesser response.

Actin filaments became more ‘organized’ after IAA stopped elongation, refuting the hypothesis that ‘more organized’ actin arrays universally correlate with rapid growth. Short‐term actin cytoskeleton response to auxin requires AUX1 and/or cytoplasmic auxin.

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Research Organization:: Purdue Univ., West Lafayette, IN (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Physical Biosciences Program

Grant/Contract Number:: FG02-04ER15526

OSTI ID:: 1599228

Alternate ID(s):: OSTI ID: 1625919
OSTI ID: 1599229

Journal Information:: New Phytologist, Journal Name: New Phytologist Journal Issue: 2 Vol. 226; ISSN 0028-646X

Publisher:: Wiley-BlackwellCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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AUX/LAX family of auxin influx carriers—an overview Swarup, Ranjan; Péret, Benjamin Frontiers in Plant Science, Vol. 3 https://doi.org/10.3389/fpls.2012.00225	journal	January 2012
Root Apex Transition Zone As Oscillatory Zone Baluška, František; Mancuso, Stefano Frontiers in Plant Science, Vol. 4 https://doi.org/10.3389/fpls.2013.00354	journal	January 2013
No Stress! Relax! Mechanisms Governing Growth and Shape in Plant Cells Guerriero, Gea; Hausman, Jean-Francois; Cai, Giampiero International Journal of Molecular Sciences, Vol. 15, Issue 3 https://doi.org/10.3390/ijms15035094	journal	March 2014
The Root Apex of Arabidopsis thaliana Consists of Four Distinct Zones of Growth Activities : Meristematic Zone, Transition Zone, Fast Elongation Zone and Growth Terminating Zone Verbelen, Jean-Pierre; Cnodder, Tinne De; Le, Jie Plant Signaling & Behavior, Vol. 1, Issue 6 https://doi.org/10.4161/psb.1.6.3511	journal	November 2006
Critical role of actin bundling in plant cell morphogenesis Higaki, Takumi; Kojo, Kei H.; Hasezawa, Seiichiro Plant Signaling & Behavior, Vol. 5, Issue 5 https://doi.org/10.4161/psb.10947	journal	May 2010
Probing the actin-auxin oscillator Nick, Peter Plant Signaling & Behavior, Vol. 5, Issue 2 https://doi.org/10.4161/psb.5.2.10337	journal	February 2010
Uniform auxin triggers the Rho GTPase-dependent formation of interdigitation patterns in pavement cells Xu, Tongda; Nagawa, Shingo; Yang, Zhenbiao Small GTPases, Vol. 2, Issue 4 https://doi.org/10.4161/sgtp.2.4.16702	journal	July 2011

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AUX1
Arabidopsis
Plant Sciences
actin
auxin
cell expansion
cytoskeleton
signaling

Auxin‐induced actin cytoskeleton rearrangements require AUX1

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