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  The desert plant Phoenix dactylifera closes stomata via nitrate-regulated SLAC1 anion channel

Müller, H. M., Schäfer, N., Bauer, H., Geiger, D., Lautner, S., Fromm, J., et al. (2017). The desert plant Phoenix dactylifera closes stomata via nitrate-regulated SLAC1 anion channel. New Phytologist, 216(1), 150-162. doi:10.1111/nph.14672.

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Müller, H. M., Autor
Schäfer, N., Autor
Bauer, H., Autor
Geiger, D., Autor
Lautner, S., Autor
Fromm, J., Autor
Riederer, M., Autor
Bueno, A., Autor
Nussbaumer, T., Autor
Mayer, K., Autor
Alquraishi, S. A., Autor
Alfarhan, A. H., Autor
Neher, Erwin1, Autor                 
Al-Rasheid, K. A. S., Autor
Ache, P., Autor
Hedrich, R., Autor
Affiliations:
1Emeritus Group of Membrane Biophysics, MPI for Biophysical Chemistry, Max Planck Society, ou_1571137              

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Schlagwörter: S-type anion channel; SLAC1; abscisic acid (ABA) signalling; cuticle; cuticular waxes; date palm Phoenix dactylifera; guard cells; stomata
 Zusammenfassung: Date palm Phoenix dactylifera is a desert crop well adapted to survive and produce fruits under extreme drought and heat. How are palms under such harsh environmental conditions able to limit transpirational water loss? Here, we analysed the cuticular waxes, stomata structure and function, and molecular biology of guard cells from P. dactylifera. To understand the stomatal response to the water stress phytohormone of the desert plant, we cloned the major elements necessary for guard cell fast abscisic acid (ABA) signalling and reconstituted this ABA signalosome in Xenopus oocytes. The PhoenixSLAC1-type anion channel is regulated by ABA kinase PdOST1. Energy-dispersive X-ray analysis (EDXA) demonstrated that date palm guard cells release chloride during stomatal closure. However, in Cl- medium, PdOST1 did not activate the desert plant anion channel PdSLAC1 per se. Only when nitrate was present at the extracellular face of the anion channel did the OST1-gated PdSLAC1 open, thus enabling chloride release. In the presence of nitrate, ABA enhanced and accelerated stomatal closure. Our findings indicate that, in date palm, the guard cell osmotic motor driving stomatal closure uses nitrate as the signal to open the major anion channel SLAC1. This initiates guard cell depolarization and the release of anions together with potassium.

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Sprache(n): eng - English
 Datum: 2017-07-032017-10
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1111/nph.14672
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Titel: New Phytologist
  Andere : New Phytol.
Genre der Quelle: Zeitschrift
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Affiliations:
Ort, Verlag, Ausgabe: Wiley; New Phytologist Foundation
Seiten: - Band / Heft: 216 (1) Artikelnummer: - Start- / Endseite: 150 - 162 Identifikator: ISSN: 0028-646X
CoNE: https://pure.mpg.de/cone/journals/resource/954925334695