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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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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-B199-E Version Permalink: http://hdl.handle.net/21.11116/0000-0001-3BA3-5
Genre: Journal Article

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

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Free keywords: S-type anion channel; SLAC1; abscisic acid (ABA) signalling; cuticle; cuticular waxes; date palm Phoenix dactylifera; guard cells; stomata
 Abstract: 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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Language(s): eng - English
 Dates: 2017-07-032017-10
 Publication Status: Published in print
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1111/nph.14672
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Title: New Phytologist
Source Genre: Journal
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Pages: - Volume / Issue: 216 (1) Sequence Number: - Start / End Page: 150 - 162 Identifier: -