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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ArticleAuthors
Soldan, RiccardoMapelli, Francesca
Crotti, Elena
Schnell, Sylvia
Daffonchio, Daniele

Marasco, Ramona

Fusi, Marco

Borin, Sara
Cardinale, Massimiliano
KAUST Department
Biological and Environmental Sciences and Engineering (BESE) DivisionBioscience Program
Red Sea Research Center (RSRC)
KAUST Grant Number
OSR-2018-CARF-1973Date
2019-03-26Online Publication Date
2019-03-26Print Publication Date
2019-06Permanent link to this record
http://hdl.handle.net/10754/652832
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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 BVJournal
Microbiological ResearchAdditional Links
https://www.sciencedirect.com/science/article/pii/S0944501319301156ae974a485f413a2113503eed53cd6c53
10.1016/j.micres.2019.03.008