Salicylic acid alleviates cadmium-induced stress responses through the inhibition of Cd-induced auxin-mediated reactive oxygen species production in barley root tips

Auxin is a master regulator of root growth by modulating its development under the constantly changing environment. Recently, an antagonistic interaction was suggested between SA and IAA signaling. Therefore, the purpose of this work was to analyze and compare the effect of the indole-3-acetic acid...

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Bibliographic Details
Published in:Journal of plant physiology 2015-01, Vol.173, p.1-8
Main Authors: Tamás, Ladislav, Mistrík, Igor, Alemayehu, Aster, Zelinová, Veronika, Bočová, Beáta, Huttová, Jana
Format: Article
Language:English
Subjects:
Activation
Auxin
Barley
Cadmium
Cadmium - toxicity
Clofibric Acid - pharmacology
Hordeum - drug effects
Hordeum - physiology
Indoleacetic Acids - metabolism
Inhibition
Inhibitors
Lipoxygenase - metabolism
Meristem - drug effects
Meristem - physiology
Plant Growth Regulators - metabolism
Plant Proteins - metabolism
Plant Roots - drug effects
Plant Roots - physiology
Reactive Oxygen Species - metabolism
Root growth inhibition
Root swelling
Roots
Salicylic acid
Salicylic Acid - pharmacology
Signal Transduction - drug effects
Stresses
Tips
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Summary:Auxin is a master regulator of root growth by modulating its development under the constantly changing environment. Recently, an antagonistic interaction was suggested between SA and IAA signaling. Therefore, the purpose of this work was to analyze and compare the effect of the indole-3-acetic acid (IAA) signaling inhibitor p-chlorophenoxyisobutyric acid (PCIB) and salicylic acid (SA) as a potential IAA signaling inhibitor on the root growth, enzyme activity and reactive oxygen species (ROS) production in Cd- and IAA-treated barley root tips. Exposure of plants to Cd resulted in a more than threefold increase of IAA content in the root apex even 3h after the treatment. In addition, exogenously applied IAA evoked root responses such as root growth inhibition and swelling, ROS generation and activation of lipoxygenase or glutathione peroxidase identical to those induced by Cd. Furthermore, both Cd- and IAA-induced stress responses were markedly reversed by PCIB or SA post-treatment. Similarly to PCIB, SA did not affect the IAA content of root tips, suggesting the action of SA on the IAA signaling pathway in barley roots. SA probably does not alleviate the Cd toxicity in roots, but rather prevents or partially inhibits the root defense response to the presence of Cd through the inhibition of Cd-induced IAA-mediated ROS generation in roots.
ISSN:0176-1617
1618-1328
DOI:10.1016/j.jplph.2014.08.018