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    Nitrogen depletion enhances endodermal suberization without restricting transporter-mediated root NO3- influx

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    Type
    Article
    Authors
    Melino, Vanessa Jane
    Plett, D C
    Bendre, P
    Thomsen, H C cc
    Zeisler-Diehl, V V
    Schreiber, L
    Kronzucker, H J
    KAUST Department
    Biological and Environmental Science and Engineering (BESE) Division
    Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia.
    Date
    2020-12-17
    Online Publication Date
    2020-12-17
    Print Publication Date
    2021-02
    Embargo End Date
    2022-12-26
    Submitted Date
    2020-11-03
    Permanent link to this record
    http://hdl.handle.net/10754/666802
    
    Metadata
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    Abstract
    Roots vary their permeability to aid radial transport of solutes towards xylem vessels in response to nutritional cues. Nitrogen (N) depletion was previously shown to induce early suberization of endodermal cell walls and reduce hydraulic conductivity of barley roots suggesting reduced apoplastic transport of ions (Armand et al., 2019). Suberization may also limit transcellular ion movement by blocking access to transporters (Barberon et al., 2016). The aim of this study was to confirm that N depletion induced suberization in the roots of barley and demonstrate that this was a specific effect in response to NO$_{3}$$^{-}$ depletion. Furthermore, in roots with early and enhanced suberization, we assessed their ability for transporter-mediated NO$_{3}$$^{-}$ influx. N depletion induced lateral root elongation and early and enhanced endodermal suberization of the seminal root of each genotype. Both root to shoot NO$_{3}$$^{-}$ translocation and net N uptake was half that of plants supplied with steady-state NO$_{3}$$^{-}$. Genes with predicted functions in suberin synthesis (HvHORST) and NO$_{3}$$^{-}$ transport (HvNRT2.2) were induced under N-deplete conditions. N-deplete roots had a higher capacity for high-affinity NO$_{3}$- influx in early suberized roots than under optimal NO$_{3}$$^{-}$. In conclusion, NO$_{3}$$^{-}$ depletion induced early and enhanced suberization in the roots of barley, however, suberization did not restrict transcellular NO$_{3}$$^{-}$ transport.
    Citation
    Melino, V. J., Plett, D. C., Bendre, P., Thomsen, H. C., Zeisler-Diehl, V. V., Schreiber, L., & Kronzucker, H. J. (2021). Nitrogen depletion enhances endodermal suberization without restricting transporter-mediated root NO3- influx. Journal of Plant Physiology, 257, 153334. doi:10.1016/j.jplph.2020.153334
    Sponsors
    The authors would like to acknowledge the University of Melbourne, School of Agriculture and Food research investment fund, Australia. We acknowledge the Melbourne Histology and Histopathology platform and expert advice of Laura Leone and the University of Melbourne Biological Optical Microscopy (BOMP) platform. We would like to acknowledge Melbourne TrACEES Platform for the service and expert advice by Michael Hall.
    Publisher
    Elsevier BV
    Journal
    Journal of plant physiology
    DOI
    10.1016/j.jplph.2020.153334
    PubMed ID
    33373827
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S0176161720302248
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.jplph.2020.153334
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division

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