Guard Cell Salicylic Acid Signaling Is Integrated into Abscisic Acid Signaling via the Ca 2+ /CPK-Dependent Pathway.
| Autor: | Prodhan MY; Graduate School of Environmental and Life Science, Okayama University, Kita-ku, Okayama 700-8530 Japan., Munemasa S; Graduate School of Environmental and Life Science, Okayama University, Kita-ku, Okayama 700-8530 Japan., Nahar MN; Graduate School of Environmental and Life Science, Okayama University, Kita-ku, Okayama 700-8530 Japan., Nakamura Y; Graduate School of Environmental and Life Science, Okayama University, Kita-ku, Okayama 700-8530 Japan., Murata Y; Graduate School of Environmental and Life Science, Okayama University, Kita-ku, Okayama 700-8530 Japan muta@cc.okayama-u.ac.jp. |
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| Jazyk: | angličtina |
| Zdroj: | Plant physiology [Plant Physiol] 2018 Sep; Vol. 178 (1), pp. 441-450. Date of Electronic Publication: 2018 Jul 23. |
| DOI: | 10.1104/pp.18.00321 |
| Abstrakt: | The phenolic hormone salicylic acid (SA) induces stomatal closure. It has been suggested that SA signaling is integrated with abscisic acid (ABA) signaling in guard cells, but the integration mechanism remains unclear. The Ca 2+ -independent protein kinase Open Stomata1 (OST1) and Ca 2+ -dependent protein kinases (CPKs) are key for ABA-induced activation of the slow-type anion channel SLAC1 and stomatal closure. Here, we show that SA-induced stomatal closure and SA activation of slow-type anion channel are impaired in the CPK disruption mutant cpk3-2 cpk6-1 but not in the OST1 disruption mutant ost1-3 We also found that the key phosphorylation sites of SLAC1 in ABA signaling, serine-59 and serine-120, also are important for SA signaling. Chemiluminescence-based detection of superoxide anion revealed that SA did not require CPK3 and CPK6 for the induction of reactive oxygen species production. Taken together, our results suggest that SA activates peroxidase-mediated reactive oxygen species signal that is integrated into Ca 2+ /CPK-dependent ABA signaling branch but not the OST1-dependent signaling branch in Arabidopsis ( Arabidopsis thaliana ) guard cells. (© 2018 American Society of Plant Biologists. All rights reserved.) |
| Databáze: | MEDLINE |
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