Predatory protists play predominant roles in suppressing soil-borne fungal pathogens under organic fertilization regimes

Ren, Peixin; Sun, Anqi; Jiao, Xiaoyan; Shen, Jin-Hui; Yu, Dan-Ting; Li, Fangfang; Wu, Bingxue; He, Ji‐Zheng; Hu, Hang‐Wei

doi:10.1016/j.scitotenv.2022.160986

Cited by 17 publications

(6 citation statements)

References 49 publications

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“…For instance, they can directly inhibit the growth of their competitors by secreting species-specific or instead broad-spectrum volatile or soluble antimicrobial compounds [5][6][7] . Antagonistic interactions can also be mediated by contact-dependent growth inhibition 8 , and predatory protists can feed on their preys by phagocytosis [9][10][11] . Furthermore, through 'exploitative competition', some organisms outcompete other members of the microbial community by monopolizing the use of essential but limited nutrient resources [12][13][14][15] .…”

Section: W I T H D R a W N Introductionmentioning

confidence: 99%

WITHDRAWN: Nitrogen sources enhance siderophore-mediated competition for iron between potato common scab and late blight causative agents

Stulanovic,

Kerdel,

Rezende

et al. 2023

Preprint

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How do pathogens colonizing the same host interact with each other? We evaluated here the types of interactions taking place between Streptomyces scabiei and Phytophthora infestans, the causative agents of common scab and late blight diseases on potato crops, respectively. Under most conditions tested S. scabiei impaired or completely inhibited the growth of P. infestans by producing either soluble and/or volatile compounds. Media component analysis revealed that increasing peptone levels correlated with increased inhibition of P. infestans. Comparative metabolomics showed that production of S. scabiei siderophores (desferrioxamines, pyochelin, scabichelin and turgichelin) increased with the quantity of peptone thereby suggesting that they participate in the inhibition of the oomycete growth. Mass spectrometry imaging further uncovered that the zones of secreted siderophores and of P. infestans growth inhibition coincided. Moreover, either the repression of siderophore production or the neutralization of the iron-chelating activity of siderophores both led to a resumption of P. infestans growth. Importantly, replacement of peptone by natural nitrogen sources such as sodium nitrate, ammonium sulfate, and urea also triggered siderophore production in S. scabiei. Overall, our work further emphasizes the importance of competition for iron between microorganisms that colonize the same niche. As common scab never alters the biological function of tubers, we propose that S. scabiei, under certain conditions, could play a protective role for its hosts against much more destructive pathogens through exploitative iron competition and volatile compound production.

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Section: W I T H D R a W N Introductionmentioning

confidence: 99%

WITHDRAWN: Nitrogen sources enhance siderophore-mediated competition for iron between potato common scab and late blight causative agents

Stulanovic,

Kerdel,

Rezende

et al. 2023

Preprint

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“…Furthermore, recent studies have found that protists are the main indicators and determinants of plant performance ( Guo S. et al, 2021 ) and health ( Xiong et al, 2020 ). Protists may impact plants via top-down impacts on microbial community composition ( Erktan et al, 2020 ), community assembly ( Huang et al, 2021 ), plant-beneficial microbiome ( Gao et al, 2019 ), soil-borne fungal pathogens ( Ren et al, 2023 ), and bacteria-fungi interactions ( Zhai et al, 2024 ). Therefore, protists can contribute to aboveground ecosystem functions.…”

Section: Discussionmentioning

confidence: 99%

Shrub expansion raises both aboveground and underground multifunctionality on a subtropical plateau grassland: coupling multitrophic community assembly to multifunctionality and functional trade-off

Ding,

Chen,

Wang

et al. 2024

Front. Microbiol.

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IntroductionShrubs have expanded into grasslands globally. However, the relative importance of aboveground and underground diversity and the relative importance of underground community assembly and diversity in shaping multifunctionality and functional trade-offs over shrub expansion remains unknown.MethodsIn this study, aboveground and underground multitrophic communities (abundant and rare archaea, bacteria, fungi, nematodes, and protists) and 208 aboveground and underground ecosystem properties or indicators were measured at three stages (Grass, Mosaic, Shrub) of shrub expansion on the Guizhou subtropical plateau grassland to study multifunctionality and functional trade-offs.ResultsThe results showed that shrub expansion significantly enhanced aboveground, underground, and entire ecosystem multifunctionality. The functional trade-off intensities of the aboveground, underground, and entire ecosystems showed significant V-shaped changes with shrub expansion. Shrub expansion improved plant species richness and changed the assembly process and species richness of soil abundant and rare subcommunities. Plant species diversity had a greater impact on multifunctionality than soil microbial diversity by more than 16%. The effect of plant species diversity on functional trade-offs was only one-fifth of the effect of soil microbial diversity. The soil microbial species richness did not affect multifunctionality, however, the assembly process of soil microbial communities did. Rather than the assembly process of soil microbial communities, the soil microbial species richness affected functional trade-offs.DiscussionOur study is the first to couple multitrophic community assemblies to multifunctionality and functional trade-offs. Our results would boost the understanding of the role of aboveground and underground diversity in multifunctionality and functional trade-offs.

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“…Soil protists are essential to the intricate soil food webs, making significant contributions to nutrient cycling, organic matter decomposition and soil pathogen suppression (Nguyen et al, 2020;Ren et al, 2023). These microorganisms act as prominent predators of bacteria and fungi in soil, parasites of animals and plants and even function as primary producers (Geisen et al, 2016(Geisen et al, , 2018Huang et al, 2021;Xiong et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Seasonality regulates the taxonomic and functional compositions of protists responding to climate warming in forest ecosystems

Li,

Sun,

Liu

et al. 2023

J of Sust Agri & Env

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IntroductionProtists are unicellular eukaryotes including important predators, parasites and phototrophs, and play pivotal roles in organic matter decomposition, biogeochemical nutrient cycling and various ecosystem functions. Unravelling the impact of climate warming on soil protists is paramount in predicting how these microorganisms will continue to provide essential ecosystem services in the face of changing climatic conditions.Materials and MethodsWe examined the effects of 5‐year simulated climate warming scenario, with temperatures increased by 4°C above ambient levels, on the diversity and community composition of soil protists, as well as their interactions with other microorganisms in both natural and plantation forest ecosystems during three seasons: summer, autumn and winter.ResultsWe found a season‐dependent response of protists to climate warming, with a significant decrease in protist diversity during winter in natural forests. Furthermore, we identified significant alterations in the community compositions of protists during summer in both natural and plantation forests, as well as during winter in both forest types, under warming. Our analysis pinpointed specific functional protist taxa, such as consumers, parasites and phototrophs, which exhibited significant shifts in their relative abundances under warming. Additionally, we found that warming facilitated trophic interactions between protists and bacteria, while also strengthening interactions between bacterial and fungal communities. Warming could induce direct modifications in protist community compositions or indirectly affect them by modifying bacterial and fungal communities, as revealed by structural equation modelling.ConclusionThese findings demonstrate the substantial impact of warming on the taxonomic and functional compositions of protists in forest ecosystems, with the magnitude of these effects varying across seasons. Our study implicates that ongoing climate warming could have significant consequences for the profiles of soil protists, as well as their trophic interactions with bacteria and fungi, highlighting the importance of considering these effects for the sustainable provision of ecosystem functions.

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Predatory protists play predominant roles in suppressing soil-borne fungal pathogens under organic fertilization regimes

Cited by 17 publications

References 49 publications

WITHDRAWN: Nitrogen sources enhance siderophore-mediated competition for iron between potato common scab and late blight causative agents

WITHDRAWN: Nitrogen sources enhance siderophore-mediated competition for iron between potato common scab and late blight causative agents

Shrub expansion raises both aboveground and underground multifunctionality on a subtropical plateau grassland: coupling multitrophic community assembly to multifunctionality and functional trade-off

Seasonality regulates the taxonomic and functional compositions of protists responding to climate warming in forest ecosystems

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