Testing the stress gradient hypothesis in soil bacterial communities associated with vegetation belts in the Andean Atacama Desert.

Publisher: BMC Country of Publication: England NLM ID: 101768168 Publication Model: Electronic Cited Medium: Internet ISSN: 2524-6372 (Electronic) Linking ISSN: 25246372 NLM ISO Abbreviation: Environ Microbiome Subsets: PubMed not MEDLINE

Original Publication: [London] : BMC, [2019]-

Background: Soil microorganisms are in constant interaction with plants, and these interactions shape the composition of soil bacterial communities by modifying their environment. However, little is known about the relationship between microorganisms and native plants present in extreme environments that are not affected by human intervention. Using high-throughput sequencing in combination with random forest and co-occurrence network analyses, we compared soil bacterial communities inhabiting the rhizosphere surrounding soil (RSS) and the corresponding bulk soil (BS) of 21 native plant species organized into three vegetation belts along the altitudinal gradient (2400-4500 m a.s.l.) of the Talabre-Lejía transect (TLT) in the slopes of the Andes in the Atacama Desert. We assessed how each plant community influenced the taxa, potential functions, and ecological interactions of the soil bacterial communities in this extreme natural ecosystem. We tested the ability of the stress gradient hypothesis, which predicts that positive species interactions become increasingly important as stressful conditions increase, to explain the interactions among members of TLT soil microbial communities.
Results: Our comparison of RSS and BS compartments along the TLT provided evidence of plant-specific microbial community composition in the RSS and showed that bacterial communities modify their ecological interactions, in particular, their positive:negative connection ratios in the presence of plant roots at each vegetation belt. We also identified the taxa driving the transition of the BS to the RSS, which appear to be indicators of key host-microbial relationships in the rhizosphere of plants in response to different abiotic conditions. Finally, the potential functions of the bacterial communities also diverge between the BS and the RSS compartments, particularly in the extreme and harshest belts of the TLT.
Conclusions: In this study, we identified taxa of bacterial communities that establish species-specific relationships with native plants and showed that over a gradient of changing abiotic conditions, these relationships may also be plant community specific. These findings also reveal that the interactions among members of the soil microbial communities do not support the stress gradient hypothesis. However, through the RSS compartment, each plant community appears to moderate the abiotic stress gradient and increase the efficiency of the soil microbial community, suggesting that positive interactions may be context dependent.
(© 2023. The Author(s).)

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11200319 Agencia Nacional de Investigación y Desarrollo; 3190194 Agencia Nacional de Investigación y Desarrollo; Ph.D. Fellowship 21210808 Agencia Nacional de Investigación y Desarrollo; FB21006 Agencia Nacional de Investigación y Desarrollo; ANID-MILENIO-CN2021-044 Agencia Nacional de Investigación y Desarrollo; 1201278 Agencia Nacional de Investigación y Desarrollo; Postdoctoral contract Severo Ochoa Program; Powered@NLHPC NLHPC (ECM-02); SEV-2016-0672 (2017-2021) Agencia Estatal de Investigación of Spain

Keywords: Bacteria; Co-occurrence networks; Plant community; Soil microbiota; Vegetation belts

Date Created: 20230328 Latest Revision: 20230331

20231215

PMC10052861

10.1186/s40793-023-00486-w

36978149