Auxin‐induced actin cytoskeleton rearrangements require AUX1
Abstract
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. Shortterm actin cytoskeleton responsemore »
- Authors:
-
[1];
[2]
- 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
- Publication Date:
- Research Org.:
- Purdue Univ., West Lafayette, IN (United States)
- Sponsoring Org.:
- USDOE; USDOE Office of Science (SC), Physical Biosciences Program
- OSTI Identifier:
- 1599228
- Alternate Identifier(s):
- OSTI ID: 1599229; OSTI ID: 1625919
- Grant/Contract Number:
- DE‐FG02‐09ER15526; FG02-04ER15526
- Resource Type:
- Published Article
- Journal Name:
- New Phytologist
- Additional Journal Information:
- Journal Name: New Phytologist Journal Volume: 226 Journal Issue: 2; Journal ID: ISSN 0028-646X
- Publisher:
- Wiley-Blackwell
- Country of Publication:
- United Kingdom
- Language:
- English
- Subject:
- Plant Sciences; actin; Arabidopsis; AUX1; auxin; cell expansion; cytoskeleton; signaling
Citation Formats
Arieti, Ruthie S., and Staiger, Christopher J. Auxin‐induced actin cytoskeleton rearrangements require AUX1. United Kingdom: N. p., 2020.
Web. doi:10.1111/nph.16382.
Arieti, Ruthie S., & Staiger, Christopher J. Auxin‐induced actin cytoskeleton rearrangements require AUX1. United Kingdom. doi:10.1111/nph.16382.
Arieti, Ruthie S., and Staiger, Christopher J. Tue .
"Auxin‐induced actin cytoskeleton rearrangements require AUX1". United Kingdom. doi:10.1111/nph.16382.
@article{osti_1599228,
title = {Auxin‐induced actin cytoskeleton rearrangements require AUX1},
author = {Arieti, Ruthie S. and Staiger, Christopher J.},
abstractNote = {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. Shortterm actin cytoskeleton response to auxin requires AUX1 and/or cytoplasmic auxin.},
doi = {10.1111/nph.16382},
journal = {New Phytologist},
number = 2,
volume = 226,
place = {United Kingdom},
year = {2020},
month = {2}
}
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DOI: 10.1111/nph.16382
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