Bacterial Diversity Associated With the Rhizosphere and Endosphere of Two Halophytes: Glaux maritima and Salicornia europaea
2018
Root-associated microbial communities are very important in the adaptation of
halophytesto coastal environments. However, little has been reported on microbial
community structuresrelated to
halophytes, or on comparisons of their compositions among
halophyticplant species. Here, we studied the diversity and
community structureof both
rhizosphereand root endosphere bacteria in two
halophyticplants: Glaux maritima and
Salicornia europaea. We sampled the
rhizosphere, the root endosphere, and bulk control soil samples, and performed bacterial 16S rRNA sequencing using the Illumina MiSeq platform to characterize the bacterial community diversities in the
rhizosphereand root endosphere of both
halophytes. Among the G. maritima samples, the richness and diversity of bacteria in the
rhizospherewere higher than those in the root endosphere but were lower than those of the
bulk soil. In contrast for S. europaea, the
bulk soil, the
rhizosphere, and the root endosphere all had similar bacterial richness and diversity. The number of unique
operational taxonomic unitswithin the root endosphere, the
rhizosphere, and the
bulk soilwere 181, 366, and 924 in G. maritima and 126, 416, and 596 in S. europaea, respectively, implying habitat-specific patterns for each
halophyte. In total, 35 phyla and 566 genera were identified. The dominant phyla across all samples were Proteobacteria and
Bacteroidetes.
Actinobacteriawas extremely abundant in the root endosphere from G. maritima. Beneficial bacterial genera were enriched in the root endosphere and
rhizospherein both
halophytes. Rhizobium,
Actinoplanes, and
Marinomonaswere highly abundant in G. maritima, whereas Sulfurimonas and Coleofasciculus were highly abundant in S. europaea. A principal coordinate analysis demonstrated significant differences in the microbiota composition associated with the plant species and type of sample. These results strongly indicate that there are clear differences in bacterial
community structureand diversity between G. maritima and S. europaea. This is the first report to characterize the
root microbiomeof G. maritima, and to compare the diversity and
community structureof
rhizosphereand root endosphere bacteria between G. maritima and S. europaea.
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