Absence of stress‐promoted facilitation coupled with a competition decrease in the microbiome of ephemeral saline lakes

Menéndez‐Serra, Mateu; Ontiveros, Vicente J.; Barberán, Albert; Casamayor, Emilio O.

doi:10.1002/ecy.3834

Cited by 5 publications

(3 citation statements)

References 44 publications

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“… Zhao et al (2022) found that high salt stress increased network connectivity in saline agricultural soils. However, Menendez-Serra et al (2022) found that the microbial co-occurrence network was stable in ephemeral saline lakes under severe salinity fluctuations. Additionally, another study reported that the connectivity and complexity of the rhizosphere bacterial co-occurrence network were lowered in response to salt stress in Nitraria tangutorum ( Pan et al, 2022 ).…”

Section: Discussionmentioning

confidence: 98%

Comparative metagenomic analysis reveals rhizosphere microbial community composition and functions help protect grapevines against salt stress

Wang

et al. 2023

Front. Microbiol.

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IntroductionSoil salinization is a serious abiotic stress for grapevines. The rhizosphere microbiota of plants can help counter the negative effects caused by salt stress, but the distinction between rhizosphere microbes of salt-tolerant and salt-sensitive varieties remains unclear.MethodsThis study employed metagenomic sequencing to explore the rhizosphere microbial community of grapevine rootstocks 101-14 (salt tolerant) and 5BB (salt sensitive) with or without salt stress.Results and DiscussionCompared to the control (treated with ddH2O), salt stress induced greater changes in the rhizosphere microbiota of 101-14 than in that of 5BB. The relative abundances of more plant growth-promoting bacteria, including Planctomycetes, Bacteroidetes, Verrucomicrobia, Cyanobacteria, Gemmatimonadetes, Chloroflexi, and Firmicutes, were increased in 101-14 under salt stress, whereas only the relative abundances of four phyla (Actinobacteria, Gemmatimonadetes, Chloroflexi, and Cyanobacteria) were increased in 5BB under salt stress while those of three phyla (Acidobacteria, Verrucomicrobia, and Firmicutes) were depleted. The differentially enriched functions (KEGG level 2) in 101-14 were mainly associated with pathways related to cell motility; folding, sorting, and degradation functions; glycan biosynthesis and metabolism; xenobiotics biodegradation and metabolism; and metabolism of cofactors and vitamins, whereas only the translation function was differentially enriched in 5BB. Under salt stress, the rhizosphere microbiota functions of 101-14 and 5BB differed greatly, especially pathways related to metabolism. Further analysis revealed that pathways associated with sulfur and glutathione metabolism as well as bacterial chemotaxis were uniquely enriched in 101-14 under salt stress and therefore might play vital roles in the mitigation of salt stress on grapevines. In addition, the abundance of various sulfur cycle-related genes, including genes involved in assimilatory sulfate reduction (cysNC, cysQ, sat, and sir), sulfur reduction (fsr), SOX systems (soxB), sulfur oxidation (sqr), organic sulfur transformation (tpa, mdh, gdh, and betC), increased significantly in 101-14 after treatment with NaCl; these genes might mitigate the harmful effects of salt on grapevine. In short, the study findings indicate that both the composition and functions of the rhizosphere microbial community contribute to the enhanced tolerance of some grapevines to salt stress.

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Section: Discussionmentioning

confidence: 98%

Comparative metagenomic analysis reveals rhizosphere microbial community composition and functions help protect grapevines against salt stress

Wang

et al. 2023

Front. Microbiol.

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“…Support for the SGH within soil bacterial communities is found when the effects of holistic stress gradients (Hernandez et al 2021, Mandakovic et al 2023) or an investigation of different stressors (Zhou et al 2021) are considered, both mimicking the potential effects of broader global change on soil communities. Narrower environmental gradients such as salinity (Menéndez‐Serra et al 2022) or drought (Gao et al 2022) may find more conflicting results where different bacterial groups exhibit more variable responses. Collapse of facilitation under high environmental stress is shown in soil bacteria as in other systems (Wang et al 2018), and drought is frequently reported as a driving environmental control of interaction strengths (de Vries et al 2018, Gao et al 2022).…”

Section: Bacterial Facilitation In Changing Environmentsmentioning

confidence: 99%

The underground network: facilitation in soil bacteria

Jorna,

Adams,

Aanderud

et al. 2024

Oikos

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Our understanding of the fundamental role that soil bacteria play in the structure and functioning of Earth's ecosystems is ever expanding, but insight into the nature of interactions within these bacterial communities remains rudimentary. Bacterial facilitation may enhance the establishment, growth, and succession of eukaryotic biota, elevating the complexity and diversity of the entire soil community and thereby modulating multiple ecosystem functions. Global climate change often alters soil bacterial community composition, which, in turn, impacts other dependent biota. However, the impact of climate change on facilitation within bacterial communities remains poorly understood even though it may have important cascading consequences for entire ecosystems. The wealth of metagenomic data currently being generated gives community ecologists the ability to investigate bacterial facilitation in the natural world and how it affects ecological systems responses to climate change. Here, we review current evidence demonstrating the importance of facilitation in promoting emergent properties such as community diversity, ecosystem functioning, and resilience to climate change in soil bacterial communities. We show that a synthesis is currently missing between the abundant data, newly developed models and a coherent ecological framework that addresses these emergent properties. We highlight that including phylogenetic information, the physicochemical environment, and species‐specific ecologies can improve our ability to infer interactions in natural soil communities. Following these recommendations, studies on bacterial facilitation will be an important piece of the puzzle to understand the consequences of global change on ecological communities and a model to advance our understanding of facilitation in complex communities more generally.

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“…The Stress Gradient Hypothesis (SGH) 13 is an influential hypothesis that originated in ecology as an experimental conjecture and has evolved into a valuable tool, also used in restoration studies 23,[31][32][33] . Additionally, the SGH has been increasingly applied to other living systems 34 , such as microbial and microbiome systems where it has garnered experimental and modeling support [35][36][37][38][39] , despite some divergent findings 40 . Particularly, the SGH has been fundamental in promoting discussion and inspiring research about the relationship between plant We modelled the dynamics of a nurse plant and a protégé plant which compete for two resources, soil water and light, with the protégé plant grazed by herbivores.…”

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confidence: 99%

Facilitation and competition deconstructed: a mechanistic modelling approach to the stress gradient hypothesis applied to drylands

Díaz-Sierra,

Rietkerk,

Verwijmeren

et al. 2024

Sci Rep

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Facilitative interactions among species are key in plant communities. While experimental tests support the Stress Gradient Hypothesis (SGH) as an association between facilitation and stress, whether the shape of net effects along stress gradients can be predicted is controversial, with no available mathematical modelling approaches. We proposed a novel test, using a modification of the R* model to study how negative and positive partial effects of plant interactions in drylands combine along two common stress gradients. We modelled different interactions: competition for water and light, amelioration of soil infiltration and/or grazing protection, obtaining that intensity and importance of facilitation did not generally increase along stress gradients, being dependent on the interaction type. While along the water stress gradient net interactions became more positive, reaching a maximum and then waning again, various outcomes were observed along the grazing gradient. Shape variety was mainly driven by the various shapes of the partial positive effects. Under resource stress, additive interaction effects can be expected, whereas when including grazing, the effects were non-additive. In the context of the SGH, deconstructing the effect of positive and negative interaction in a pairwise mechanistic models of drylands does not show a unique shape along stress gradients.

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Absence of stress‐promoted facilitation coupled with a competition decrease in the microbiome of ephemeral saline lakes

Abstract: This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process which may lead to differences between this version and the Version of Record. Please cite this article as

Cited by 5 publications

References 44 publications

Comparative metagenomic analysis reveals rhizosphere microbial community composition and functions help protect grapevines against salt stress

Comparative metagenomic analysis reveals rhizosphere microbial community composition and functions help protect grapevines against salt stress

The underground network: facilitation in soil bacteria

Facilitation and competition deconstructed: a mechanistic modelling approach to the stress gradient hypothesis applied to drylands

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