The legacy of microbial inoculants in agroecosystems and potential for tackling climate change challenges

Liu, Xipeng; Roux, Xavier Le; Salles, Joana Falcão

doi:10.1016/j.isci.2022.103821

Cited by 33 publications

(25 citation statements)

References 71 publications

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“…Overall, these scenarios highlight the importance of communitydriven invasion in terrestrial ecosystems and beg two fundamental questions: whether and how invasive species survive in their recipient soil and how introduced microbiomes affect the resident microbial community. Furthermore, considering the increasing use of microbial inoculants and consortia [18][19][20] , it is crucial to understand how biotic disturbances influence soil 4 microbial interactions and their potential impact on soil ecosystem functions and services.…”

Section: Introductionmentioning

confidence: 99%

Lose-lose consequences of bacterial community-driven invasions in soil

Liu

Salles

2023

Preprint

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Community-driven invasion, also known as community coalescence, occurs widely in natural ecosystems. Despite that, our knowledge about the process and mechanisms controlling community-driven invasion in soil ecosystems is lacking. Here we performed a set of coalescence experiments in soil microcosms and assessed impacts up to 60 days after coalescence by quantifying multiple traits (compositional, functional, and metabolic) of the invasive and coalescent communities. Our results show invasion-triggered changes in the resident community's succession trajectory and functionality (carbohydrate metabolism), which were dependent on the invasive communities. Moreover, the invasion impact was mainly due to the high suppression of residents rather than the invaders’ survival. The short-term coalescence effect was predicted by the metabolic unevenness of the invasive community, indicating the direct competition between invaders and residents for labile carbon sources at the onset of coalescence. In contrast, the long-term impact was predicted by the compositional (phylogenetic) similarity between invasive and resident communities. Collectively, our results suggest that community coalescences in soil are primarily driven by resource competition – the lose-lose situation – between invaders and residents, and a multi-level trait-based approach could help predict the impact.

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Section: Introductionmentioning

confidence: 99%

Lose-lose consequences of bacterial community-driven invasions in soil

Liu

Salles

2023

Preprint

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“…Such a decline in diversity following invasion has been observed in micro- (Mawarda et al 2020 ) and macroorganisms (Carboni et al 2021 , Sapsford et al 2022 ), which often leads to the changes in their functional diversity (Mallon et al 2018 , Matsuzaki et al 2016 , Souza et al 2021 , Xing et al 2020 ). This type of footprint of microbial invaders on soil communities has to be accounted for to fully appreciate the impact of invasion on soil functioning and services (Liu et al 2022 ).…”

Section: Discussionmentioning

confidence: 99%

Interactions between Bacterial Inoculants and Native Soil Bacterial Community: the Case of Spore-formingBacillusspp.

Mawarda

Mallon

Roux

et al. 2022

FEMS Microbiology Ecology

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Microbial diversity can restrict the invasion and impact of alien microbes into soils via resource competition. However, this theory has not been tested on various microbial invaders with different ecological traits, particularly spore-forming bacteria. Here we investigated the survival capacity of two introduced spore-forming bacteria, Bacillus mycoides (BM) and B. pumillus (BP) and their impact on the soil microbiome niches with low and high diversity. We hypothesized that higher soil bacterial diversity would better restrict Bacillus survival via resource competition, and the invasion would alter the resident bacterial communities’ niches only if inoculants do not escape competition with the soil community (e.g. through sporulation). Our findings showed that BP could not survive as viable propagules and transiently impacted the bacterial communities’ niche structure. This may be linked to its poor resource usage and low growth rate. Having better resource use capacities, BM better survived in soil, though its survival was weakly related to the remaining resources left for them by the soil community. BM strongly affected the community niche structure, ultimately in less diverse communities. These findings show that the inverse diversity-invasibility relationship can be valid for some spore-forming bacteria, but only when they have sufficient resource use capacity.

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“…biotic barriers, have to be overcome to lead to the successful establishment of the invader [26, 29]. Changes in the community composition and diversity can result in opening up available niches that become accessible to the invading bacteria [28, 30, 35, 53, 54]. A community’s invasion resistance is related to the available niches for invader establishment: here we suspect that more diverse communities provide less available niche spaces due to a higher degree of different bacteria interacting together for the resources available.…”

Section: Discussionmentioning

confidence: 99%

Exposure to environmental stress decreases the resistance of river microbial communities towards invasion by antimicrobial resistant bacteria

Bagra

Bellanger

Merlin

et al. 2022

Preprint

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Environmental microbiomes are constantly exposed to invasion events through foreign, antibiotic resistant bacteria that were enriched in the anthropic sphere. However, the biotic and abiotic factors, as well as the natural barriers that determine the invasion success of these invader bacteria into the environmental microbiomes are poorly understood. A great example of such invasion events are river microbial communities constantly exposed to resistant bacteria originating from wastewater effluents. Here, we aim at gaining comprehensive insights into the key factors that determine their invasion success with a particular focus on the effects of environmental stressors, regularly co-released in wastewater effluents. Understanding invasion dynamics of resistant bacteria is crucial for limiting the environmental spread of antibiotic resistance. To achieve this, we grew natural microbial biofilms on glass slides in rivers for one month. The biofilms were then transferred to laboratory, recirculating flume systems and exposed to a single pulse of a model resistant invader bacterium (E. coli) either in presence or absence of stress induced by Cu2+. The invasion dynamics of E. coli into the biofilms were then monitored for 14 days. Despite an initially successful introduction of E. coli into the biofilms, independent of the imposed stress, over time the invader perished in absence of stress. However, under stress c the invading strain successfully established and proliferated in the biofilms. Noteworthy, the increased establishment success of the invader coincided with a loss in microbial community diversity under stress conditions, likely due to additional niche space becoming available for the invader.

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The legacy of microbial inoculants in agroecosystems and potential for tackling climate change challenges

Cited by 33 publications

References 71 publications

Lose-lose consequences of bacterial community-driven invasions in soil

Lose-lose consequences of bacterial community-driven invasions in soil

Interactions between Bacterial Inoculants and Native Soil Bacterial Community: the Case of Spore-formingBacillusspp.

Exposure to environmental stress decreases the resistance of river microbial communities towards invasion by antimicrobial resistant bacteria

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