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  A Ca2+-sensor switch for tolerance to elevated salt stress in Arabidopsis

Steinhorst, L., He, G., Moore, L. K., Schültke, S., Schmitz-Thom, I., Cao, Y., et al. (2022). A Ca2+-sensor switch for tolerance to elevated salt stress in Arabidopsis. Developmental Cell, 57(17), 2081-2094. doi:10.1016/j.devcel.2022.08.001.

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 Creators:
Steinhorst, Leonie1, Author
He, Gefeng1, Author
Moore, Lena K.1, Author
Schültke, Stefanie1, Author
Schmitz-Thom, Ina1, Author
Cao, Yibo1, Author
Hashimoto, Kenji1, Author
Andrés, Zaida1, Author
Piepenburg, K.2, Author           
Ragel, Paula1, Author
Behera, Smrutisanjita1, Author
Almutairi, Bader O.1, Author
Batistič, Oliver1, Author
Wyganowski, Thomas1, Author
Köster, Philipp1, Author
Edel, Kai H.1, Author
Zhang, Chunxia1, Author
Krebs, Melanie1, Author
Jiang, Caifu1, Author
Guo, Yan1, Author
Quintero, Francisco J.1, AuthorBock, R.2, Author           Kudla, Jörg1, Author more..
Affiliations:
1external, ou_persistent22              
2Organelle Biology and Biotechnology, Department Bock, Max Planck Institute of Molecular Plant Physiology, Max Planck Society, ou_1753326              

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Free keywords: sodium tolerance, salinity, calcium signaling, CBL, CIPK, SOS pathway
 Abstract: Summary
Excessive Na+ in soils inhibits plant growth. Here, we report that Na+ stress triggers primary calcium signals specifically in a cell group within the root differentiation zone, thus forming a “sodium-sensing niche” in Arabidopsis. The amplitude of this primary calcium signal and the speed of the resulting Ca2+ wave dose-dependently increase with rising Na+ concentrations, thus providing quantitative information about the stress intensity encountered. We also delineate a Ca2+-sensing mechanism that measures the stress intensity in order to mount appropriate salt detoxification responses. This is mediated by a Ca2+-sensor-switch mechanism, in which the sensors SOS3/CBL4 and CBL8 are activated by distinct Ca2+-signal amplitudes. Although the SOS3/CBL4-SOS2/CIPK24-SOS1 axis confers basal salt tolerance, the CBL8-SOS2/CIPK24-SOS1 module becomes additionally activated only in response to severe salt stress. Thus, Ca2+-mediated translation of Na+ stress intensity into SOS1 Na+/H+ antiporter activity facilitates fine tuning of the sodium extrusion capacity for optimized salt-stress tolerance.

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Language(s): eng - English
 Dates: 2022-08-242022-09-12
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.devcel.2022.08.001
 Degree: -

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Title: Developmental Cell
Source Genre: Journal
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Publ. Info: Cambridge, Mass. : Cell Press
Pages: - Volume / Issue: 57 (17) Sequence Number: - Start / End Page: 2081 - 2094 Identifier: ISSN: 1534-5807
CoNE: https://pure.mpg.de/cone/journals/resource/111006902714134