Wounding-induced stomatal closure requires jasmonate-mediated activation of GORK K+ channels by a Ca2+ sensor-kinase CBL1-CIPK5 complex
Summary - Guard cells integrate various hormone signals and environmental cues to balance plant gas exchange and transpiration. The wounding-associated hormone jasmonic acid (JA) and the drought hormone abscisic acid (ABA) both trigger stomatal closure. In contrast to ABA however, the molecular mech...
Gespeichert in:
| Hauptverfasser: | , |
|---|---|
| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
2019
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| In: |
Developmental cell
Year: 2018, Jahrgang: 48, Heft: 1, Pages: 87-99 |
| ISSN: | 1878-1551 |
| DOI: | 10.1016/j.devcel.2018.11.014 |
| Online-Zugang: | Verlag, Volltext: https://doi.org/10.1016/j.devcel.2018.11.014 Verlag, Volltext: http://www.sciencedirect.com/science/article/pii/S1534580718309328 
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| Verfasserangaben: | Sabrina Förster, Lena K. Schmidt, Eva Kopic, Uta Anschütz, Shouguang Huang, Kathrin Schlücking, Philipp Köster, Rainer Waadt, Antoine Larrieu, Oliver Batistič, Pedro L. Rodriguez, Erwin Grill, Jörg Kudla, and Dirk Becker |
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| 520 | |a Summary - Guard cells integrate various hormone signals and environmental cues to balance plant gas exchange and transpiration. The wounding-associated hormone jasmonic acid (JA) and the drought hormone abscisic acid (ABA) both trigger stomatal closure. In contrast to ABA however, the molecular mechanisms of JA-induced stomatal closure have remained largely elusive. Here, we identify a fast signaling pathway for JA targeting the K+ efflux channel GORK. Wounding triggers both local and systemic stomatal closure by activation of the JA signaling cascade followed by GORK phosphorylation and activation through CBL1-CIPK5 Ca2+ sensor-kinase complexes. GORK activation strictly depends on plasma membrane targeting and Ca2+ binding of CBL1-CIPK5 complexes. Accordingly, in gork, cbl1, and cipk5 mutants, JA-induced stomatal closure is specifically abolished. The ABA-coreceptor ABI2 counteracts CBL1-CIPK5-dependent GORK activation. Hence, JA-induced Ca2+ signaling in response to biotic stress converges with the ABA-mediated drought stress pathway to facilitate GORK-mediated stomatal closure upon wounding. | ||
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