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    Bacterial endophytes of mangrove propagules elicit early establishment of the natural host and promote growth of cereal crops under salt stress

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    MICRES_2019_107_ACCEPTED VERSION FOR REPOSITORY.pdf
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    Description:
    Accepted Manuscript
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    Type
    Article
    Authors
    Soldan, Riccardo
    Mapelli, Francesca
    Crotti, Elena
    Schnell, Sylvia
    Daffonchio, Daniele cc
    Marasco, Ramona cc
    Fusi, Marco cc
    Borin, Sara
    Cardinale, Massimiliano
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Bioscience Program
    Red Sea Research Center (RSRC)
    KAUST Grant Number
    OSR-2018-CARF-1973
    Date
    2019-03-26
    Online Publication Date
    2019-03-26
    Print Publication Date
    2019-06
    Permanent link to this record
    http://hdl.handle.net/10754/652832
    
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    Abstract
    Mangroves, dominating tropical intertidal zones and estuaries, are among the most salt tolerant plants, and propagate through reproductive units called propagules. Similarly to plant seeds, propagules may harbor beneficial bacteria. Our hypothesis was that mangroves, being able to grow into seawater, should harbor bacteria able to interact with the host and to exert positive effects under salt stress, which could be exploited to improve crop production. Therefore, we isolated bacterial endophytes from mangrove propagules with the aim to test whether these bacteria have a beneficial potential on their natural host and on different crops such as barley and rice, cultivated under salt stress. The 172 bacterial isolates obtained were screened for plant growth promotion (PGP) activities in vitro, and the 12 most promising isolates were tested on barley under non-axenic conditions and salt stress. Gordonia terrae KMP456-M40 was the best performing isolate, increasing ear weight by 65%. Based on the in vivo PGP activity and the root colonization ability, investigated by fluorescence in situ hybridization and confocal microscopy, three strains were additionally tested on mangrove propagule germination and on rice growth. The most effective strain was again G. terrae KMP456-M40, which enhanced the root length of mangrove seedlings and the biomass of salt-stressed rice under axenic conditions up to 65% and 62%, respectively. We demonstrated that propagules, the reproductive units of mangroves, host beneficial bacteria that enhance the potential of mangrove seedlings establishment and confer salt tolerance to cereal crops.
    Citation
    Soldan R, Mapelli F, Crotti E, Schnell S, Daffonchio D, et al. (2019) Bacterial endophytes of mangrove propagules elicit early establishment of the natural host and promote growth of cereal crops under salt stress. Microbiological Research 223-225: 33–43. Available: http://dx.doi.org/10.1016/j.micres.2019.03.008.
    Sponsors
    RS and MC acknowledge Karl-Heinze Kogel (Giessen) for the use the confocal microscope at the Institute of Phytopathology, JLU-Giessen. The research leading to these results received funding from the European Union's Seventh Framework Programme under grant agreement no 311975 (MACUMBA) and from the European Union's Horizon 2020 Research and Innovation program under Grant Agreement no 688320 (MADFORWATER). This publication is based upon work supported by the King Abdullah University of Science and Technology (KAUST) and the Office of Sponsored Research (OSR) under Award No. OSR-2018-CARF-1973 to the Red Sea Research Center. RS received a “Master Thesis Scholarship” from the University of Milan. FM acknowledges personal support from the project “Unveiling plant-bacterium interaction for agriculture and bioremediation (NURTURE)” (Piano di Sostegno della Ricerca 2015–2017: Linea 2 - Dotazione annuale per attività istituzionali).
    Publisher
    Elsevier BV
    Journal
    Microbiological Research
    DOI
    10.1016/j.micres.2019.03.008
    Additional Links
    https://www.sciencedirect.com/science/article/pii/S0944501319301156
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.micres.2019.03.008
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Red Sea Research Center (RSRC); Bioscience Program

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