The Biphasic Root Growth Response to Abscisic Acid in Arabidopsis Involves Interaction with Ethylene and Auxin Signalling Pathways

Exogenous abscisic acid (ABA) is known to either stimulate or inhibit root growth, depending on its concentration. In this study, the roles of ethylene and auxin in this biphasic effect of ABA on root elongation were investigated using chemical inhibitors and mutants. Inhibitors of ethylene percepti...

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Published inFrontiers in plant science Vol. 8; p. 1493
Main Authors Li, Xiaoqing, Chen, Lin, Forde, Brian G, Davies, William J
Format Journal Article
LanguageEnglish
Published Switzerland Frontiers Media S.A 25.08.2017
Subjects
abscisic acid (ABA)
Arabidopsis
auxin signalling
auxin transport
ethylene biosynthesis
ethylene signalling
Plant Science
abscisic acid (ABA)
Arabidopsis
ethylene biosynthesis
auxin signalling
auxin transport
ethylene signalling
hormone
root elongation
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Summary:Exogenous abscisic acid (ABA) is known to either stimulate or inhibit root growth, depending on its concentration. In this study, the roles of ethylene and auxin in this biphasic effect of ABA on root elongation were investigated using chemical inhibitors and mutants. Inhibitors of ethylene perception and biosynthesis and an auxin influx inhibitor were all found to block the inhibitory effect of high ABA concentrations, but not the stimulatory effect of low ABA concentrations. In addition, three ethylene-insensitive mutants ( , , and ), two auxin influx mutants ( , ) and an auxin-insensitive mutant ( ) were all insensitive to the inhibitory effect of high ABA concentrations. In the case of the stimulatory effect of low ABA concentrations, it was blocked by two different auxin efflux inhibitors and was less pronounced in an auxin efflux mutant ( ) and in the auxin-insensitive mutant. Thus it appears that the stimulatory effect seen at low ABA concentrations is an ethylene-independent pathway requiring auxin signalling and auxin efflux through PIN2/EIR1, while the inhibitory effect at high ABA concentrations is an ethylene-dependent pathway requiring auxin signalling and auxin influx through AUX1.
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This article was submitted to Plant Physiology, a section of the journal Frontiers in Plant Science
Reviewed by: Chi-Kuang Wen, Shanghai Institutes for Biological Sciences (CAS), China; Nihal Dharmasiri, Texas State University, United States
Present address: Xiaoqing Li, CSIRO Agriculture and Food, Canberra, ACT, Australia Lin Chen, Department of Biology, University of York, York, United Kingdom
Edited by: Dominique Van Der Straeten, Ghent University, Belgium
ISSN:1664-462X
1664-462X
DOI:10.3389/fpls.2017.01493