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Title: 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 » to auxin requires AUX1 and/or cytoplasmic auxin.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]
+ Show Author Affiliations
  1. 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
  2. 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.
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Arieti, Ruthie S., & Staiger, Christopher J. Auxin‐induced actin cytoskeleton rearrangements require AUX1. United Kingdom. https://doi.org/10.1111/nph.16382
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Arieti, Ruthie S., and Staiger, Christopher J. Tue . "Auxin‐induced actin cytoskeleton rearrangements require AUX1". United Kingdom. https://doi.org/10.1111/nph.16382.
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@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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https://doi.org/10.1111/nph.16382
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Figures / Tables:

Fig. 1 Fig. 1: Actin organization is predictive of epidermal cell length in the root elongation zone. (a) Mosaic of root cap and elongation zone in an Arabidopsis thaliana seedling expressing green fluorescent protein fused to the second actin-binding domain of Arabidopsis FIMBRIN1 (GFP-fABD2) imaged with variable angle epifluorescence microscopy (VAEM). Arrowhead,more » root apex; arrow, first root hair initiation. MOSAICJ was used to compile 13 original VAEM images. Region 1 encompasses the root cap (root apex to c. 300 lm from the apex); Region 2 begins c. 300 lm from the apex and ends c. 625 lm from the apex; Region 3 begins c. 625 lm from the apex and ends at the first clearly visible root hair initiations, c. 860 lm from the apex. Bar, 100 lm. (b) Representative images of actin organization in two root regions. Bar, 10 lm. (c–g) Quantification of actin architecture or orientation in the root elongation zone, metrics plotted with respect to corresponding epidermal cell length (d–g), or cell width (c). Filament architecture and orientation were not predictable based on cell width but were highly correlated with cell length. Supporting Information Fig. S2 shows results for skewness, angle and parallelness vs cell width, which also showed no relationship, and Fig. S1 shows comparisons of mean measurements of actin from Region 2 (purple squares) and Region 3 (blue circles). Mean cell length ± 1 SD: Region 2 = 57 + 28 μm, Region 3 = 128 ± 34 μm. n = 60–150 cells per region from 20 roots. a.u., arbitrary units. NR, no predictive relationship; ***, P ≤ 0.0001, Bivariate fit/ANOVA for all data points for each parameter. Results are from one experiment.« less
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