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    Linking Duplication of a Calcium Sensor to Salt Tolerance in Eutrema salsugineum

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    PP2018-RA-01400DR1_01400.pdf
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    Author
    Monihan, Shea M
    Ryu, Choong-Hwan
    Magness, Courtney A
    Schumaker, Karen S
    Affiliation
    Univ Arizona, Sch Plant Sci
    Issue Date
    2019-03-01
    
    Metadata
    Show full item record
    Publisher
    AMER SOC PLANT BIOLOGISTS
    Citation
    Monihan, S. M., Ryu, C. H., Magness, C. A., & Schumaker, K. S. (2019). Linking duplication of a calcium sensor to salt tolerance in Eutrema salsugineum. Plant physiology, 179(3), 1176-1192.
    Journal
    PLANT PHYSIOLOGY
    Rights
    © 2019 American Society of Plant Biologists. All Rights Reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    The SALT-OVERLY-SENSITIVE (SOS) pathway in Arabidopsis (Arabidopsis thaliana) functions to prevent the toxic accumulation of sodium in the cytosol when plants are grown in salt-affected soils. In this pathway, the CALCINEURIN B-LIKE10 (AtCBL10) calcium sensor interacts with the AtSOS2 kinase to activate the AtSOS1 plasma membrane sodium/proton exchanger. CBL10 has been duplicated in Eutrema (Eutrema salsugineum), a salt-tolerant relative of Arabidopsis. Because Eutrema maintains growth in salt-affected soils that kill most crop plants, the duplication of CBL10 provides a unique opportunity to functionally test the outcome of gene duplication and its link to plant salt tolerance. In Eutrema, individual down-regulation of the duplicated CBL10 genes (EsCBL10a and EsCBL10b) decreased growth in the presence of salt and, in combination, led to an even greater decrease, suggesting that both genes function in response to salt and have distinct functions. Cross-species complementation assays demonstrated that EsCBL10b has an enhanced ability to activate the SOS pathway while EsCBL10a has a function not performed by AtCBL10 or EsCBL10b. Chimeric EsCBL10a/EsCBL10b proteins revealed that the specific functions of the EsCBL10 proteins resulted from changes in the amino terminus. The duplication of CBL10 increased calcium-mediated signaling capacity in Eutrema and conferred increased salt tolerance to salt-sensitive Arabidopsis.
    Note
    12 month embargo; published online: 26 February 2019
    ISSN
    1532-2548
    PubMed ID
    30606887
    DOI
    10.1104/pp.18.01400
    Version
    Final accepted manuscript
    Sponsors
    National Science Foundation, Division of Integrative Organismal Systems [1552099]
    Additional Links
    http://www.plantphysiol.org/content/179/3/1176
    ae974a485f413a2113503eed53cd6c53
    10.1104/pp.18.01400
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