Assessing the role of endophytic bacteria in the halophyte Arthrocnemum macrostachyum salt tolerance

作者：Navarro Torre S; Barcia Piedras J M; Mateos Naranjo E; Redondo Gomez S; Camacho M; Caviedes M A; Pajuelo E; Rodriguez Llorente I D

来源：Plant Biology, 2017, 19(2): 249-256.

DOI：10.1111/plb.12521

<jats:title>Abstract</jats:title><jats:p>
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<jats:list-item><jats:p>There is an increasing interest to use halophytes for revegetation of salt affected ecosystems, as well as in understanding their mechanisms of salt tolerance. We hypothesized that bacteria from the phyllosphere of these plants might play a key role in its high tolerance to excessive salinity.</jats:p></jats:list-item>

<jats:list-item><jats:p>Eight endophytic bacteria belonging to <jats:italic>Bacillus</jats:italic> and closely related genera were isolated from phyllosphere of the halophyte <jats:italic>Arthrocnemum macrostachyum</jats:italic> growing in salty agricultural soils. The presence of plant‐growth promoting (PGP) properties, enzymatic activities and tolerance towards NaCl was determined. Effects of inoculation on seeds germination and adult plant growth under experimental NaCl treatments (0, 510 and 1030 mM NaCl) were studied.</jats:p></jats:list-item>

<jats:list-item><jats:p>Inoculation with a <jats:italic>consortium</jats:italic> including the best performing bacteria improved considerably the kinetics of germination and the final germination percentage of <jats:italic>A. macrostachyum</jats:italic> seeds. At high NaCl concentrations (1030 mM), inoculation of plants mitigated the effects of high salinity on plant growth and physiological performance and, in addition, this <jats:italic>consortium</jats:italic> appears to have increased the potential of <jats:italic>A. macrostachyum</jats:italic> to accumulate Na<jats:sup>+</jats:sup> in its shoots, thus improving sodium phytoextraction capacity.</jats:p></jats:list-item>

<jats:list-item><jats:p>Bacteria isolated from <jats:italic>A. macrostachyum</jats:italic> phyllosphere seem to play an important role in plant salt tolerance under stressing salt concentrations. The combined use of <jats:italic>A. macrostachyum</jats:italic> and its microbiome can be an adequate tool to enhance plant adaptation and sodium phytoextraction during restoration of salt degraded soils.</jats:p></jats:list-item>
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• 出版日期2017-3