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

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dc.article.number24
dc.catalogadorcrc
dc.contributor.authorMandakovic, Dinka
dc.contributor.authorAguado-Norese, Constanza
dc.contributor.authorGarcía-Jiménez, Beatriz
dc.contributor.authorHodar, Christian
dc.contributor.authorMaldonado, Jonathan E.
dc.contributor.authorGaete, Alexis
dc.contributor.authorLatorre, Mauricio
dc.contributor.authorWilkinson, Mark D.
dc.contributor.authorGutiérrez Ilabaca, Rodrigo Antonio
dc.contributor.authorCavieres, Lohengrin A.
dc.contributor.authorMedina, Joaquín
dc.contributor.authorCambiazo, Verónica
dc.contributor.authorGonzalez, Mauricio
dc.date.accessioned2023-04-03T16:05:47Z
dc.date.available2023-04-03T16:05:47Z
dc.date.issued2023
dc.date.updated2023-04-03T04:09:14Z
dc.description.abstractBackground 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.
dc.fechaingreso.objetodigital2023-04-03
dc.fuente.origenAutoarchivo
dc.identifier.citationMandakovic, D., Aguado-Norese, C., García-Jiménez, B. et al. Testing the stress gradient hypothesis in soil bacterial communities associated with vegetation belts in the Andean Atacama Desert. Environmental Microbiome 18, 24 (2023). https://doi.org/10.1186/s40793-023-00486-w
dc.identifier.doi10.1186/s40793-023-00486-w
dc.identifier.issn2524-6372
dc.identifier.urihttps://doi.org/10.1186/s40793-023-00486-w
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/66703
dc.information.autorucFacultad de Ciencias Biológicas ; Gutiérrez Ilabaca, Rodrigo Antonio ; S/I ; 86782
dc.language.isoen
dc.nota.accesoContenido completo
dc.revistaEnvironmental Microbiome
dc.rightsacceso abierto
dc.rights.holderThe Author(s)
dc.rights.licenseAttribution 4.0 International (CC BY 4.0)
dc.rights.urihttps://creativecommons.org/publicdomain/zero/1.0/
dc.subjectPlant community
dc.subjectSoil microbiota
dc.subjectCo-occurrence networks
dc.subjectVegetation belts
dc.subjectBacteria
dc.titleTesting the stress gradient hypothesis in soil bacterial communities associated with vegetation belts in the Andean Atacama Desert
dc.typeartículo
dc.volumen18
sipa.codpersvinculados86782
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