Longer dry and wet spells alter the stochasticity of microbial community assembly in grassland soils

Li, Lingjuan; Nijs, Ivan; Boeck, Hans J. De; Vindušková, Olga; Reynaert, Simon; Donnelly, Chase; Zi, Lin; Verbruggen, Erik

doi:10.1016/j.soilbio.2023.108969

Cited by 23 publications

(4 citation statements)

References 43 publications

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“…The unforeseeable spatiotemporal variations in environmental conditions, described as “environmental stochasticity”, are able to amplify uncertainties and fluctuations in microbial population and life history strategy ( 58 ). The previous study reported that intermediate disturbance (intermediate duration of dry period) can promote microbial stochastic processes ( 59 ), and this could be related with why drought induced a higher stochastic process in our study. Moreover, the response of fungi to drought stress was compartment-specific, as drought enhanced the contribution of deterministic processes to rhizospheric community assembly, indicating that the selection force of host plants on community assembly was enhanced under drought conditions.…”

Section: Discussionmentioning

confidence: 50%

Drought-induced assembly of rhizosphere mycobiomes shows beneficial effects on plant growth

Pan,

Liu,

Zhang

et al. 2024

mSystems

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Beneficial interactions between plants and rhizosphere fungi can enhance plant adaptability during drought stress. However, harnessing these interactions will require an in-depth understanding of the response of fungal community assembly to drought. Herein, by using different varieties of wheat plants, we analyzed the drought-induced changes in fungal community assembly in rhizosphere and bulk soil. We demonstrated that drought significantly altered the fungal communities, with the contribution of species richness to community beta diversity increased in both rhizosphere and bulk soil compartments during drought stress. The stochastic processes dominated fungal community assembly, but the relative importance of deterministic processes, mainly homogeneous selection, increased in the drought-stressed rhizosphere. Drought induced an increase in the relative abundance of generalists in the rhizosphere, as opposed to specialists, and the top 10 abundant taxa that enriched under drought conditions were predominantly generalists. Notably, the most abundant drought-enriched taxon in rhizosphere was a generalist, and the corresponding Chaetomium strain was found capable of improving root length and activating ABA signaling in wheat plants through culture-based experiment. Together, these findings provide evidence that host plants exert a strong influence on rhizospheric fungal community assembly during stress and suggest the fungal communities that have experienced drought have the potential to confer fitness advantages to the host plants. IMPORTANCE We have presented a framework to integrate the shifts in community assembly processes with plant-soil feedback during drought stress. We found that environmental filtering and host plant selection exert influence on the rhizospheric fungal community assembly, and the re-assembled community has great potential to alleviate plant drought stress. Our study proposes that future research should incorporate ecology with plant, microbiome, and molecular approaches to effectively harness the rhizospheric microbiome for enhancing the resilience of crop production to drought.

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Section: Discussionmentioning

confidence: 50%

Drought-induced assembly of rhizosphere mycobiomes shows beneficial effects on plant growth

Pan,

Liu,

Zhang

et al. 2024

mSystems

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“…The results of this study showed that under the APRI treatment, the largest rhizosphere bacterial Chao 1 index was observed for the 60% FMC treatment, and the Chao 1 index of the alfalfa rhizosphere with 60% FMC treatment was significantly greater than that of the alfalfa rhizosphere with 40% FMC treatment ( p < 0.01). This may be because alternating dry and wet environments are beneficial for improving microbial diversity in the plant rhizosphere ( Li et al, 2023 ). Some microorganisms die under drought conditions, after which the soil rehydrated, and the dead microorganisms are mineralized and release nutrients to support more microorganisms ( Hamer et al, 2007 ; Xie et al, 2020 ).…”

Section: Discussionmentioning

confidence: 99%

Impact of alternate partial root-zone irrigation on the rhizosphere microbiota of alfalfa plants inoculated with rhizobia

Zou,

Xin,

Wang

et al. 2024

Front. Microbiol.

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Water is an important constraint on alfalfa (Medicago sativa) production in arid and semiarid areas, and alternate irrigation in root areas has water-saving potential for alfalfa production. To investigate the impact of alternate partial root-zone irrigation (APRI) on the rhizosphere soil microorganisms of alfalfa, this study subjected alfalfa plants to different irrigation methods and irrigation levels. The growth status and rhizosphere soil microbial community diversity of alfalfa plants under alternate root-zone watering treatment were analyzed through laboratory experiments and high-throughput sequencing. The results showed that at soil moisture levels of 80% field moisture capacity (FMC) and 60% FMC, APRI had no significant impact on the biomass or nodule number of alfalfa. However, 40% FMC significantly reduced the individual plant dry weight, chlorophyll content, and nodule number of the alfalfa plants. APRI increased the relative abundance of Actinomycetes in the alfalfa rhizosphere soil. Moreover, at 60% FMC, the MBC and MBN of rhizosphere, relative abundance of Actinobacteria and unclassified K fungi and Chao 1 index of bacteria significantly increased under APRI treatment. While relative abundance of Ascomycetes and Proteobacteria in the alfalfa rhizosphere significantly reduced under 60% FMC + APRI treatment. In summary, under the same irrigation conditions, APRI did not significantly affect the growth of alfalfa in the short term. And 60%FMC + APRI treatment did significantly affect the groups, structure and diversity of the rhizosphere soil microbial communities.

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“…Soil moisture plays a crucial role in shaping soil microorganisms, especially aerobic and anaerobic microorganisms including Methylomonas and Methanobacterium formicium in agricultural fields [35], primarily sourced from atmospheric precipitation and artificial irrigation, affecting microorganisms at both spatial and temporal scales (Figure 2). Persistent precipitation has been found to significantly reduce fungal diversity and consistency, resulting in increased unpredictability of the soil microbial community composition [59]. Likewise, different irrigation methods and water types exert varied effects on soil microbes.…”

Section: Water and Fertilizer Managementmentioning

confidence: 99%

Soil Microorganisms in Agricultural Fields and Agronomic Regulation Pathways

Wang,

Chai,

Dou

et al. 2024

Agronomy

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Agricultural soil microorganisms play a crucial role in farmland ecosystems and are integral to the material cycle in these environments. The composition and abundance of soil microorganisms are influenced by agronomic measures that alter the soil microenvironment. These changes are pivotal to enhancing crop resistance, maximizing yield, and facilitating nutrient cycling in farmlands. Drawing on prior research advancements, this study systematically examined the functions of soil microorganisms, the effects of various agronomic measures on their populations, and the ways in which agronomic measures regulate soil microorganisms, and this article offers a comprehensive study of agricultural influences on microorganisms. Additionally, it outlines key areas for future research on soil microorganisms in farmlands, aiming to provide valuable insights for the sustainable development of farmland ecosystems.

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Longer dry and wet spells alter the stochasticity of microbial community assembly in grassland soils

Cited by 23 publications

References 43 publications

Drought-induced assembly of rhizosphere mycobiomes shows beneficial effects on plant growth

Drought-induced assembly of rhizosphere mycobiomes shows beneficial effects on plant growth

Impact of alternate partial root-zone irrigation on the rhizosphere microbiota of alfalfa plants inoculated with rhizobia

Soil Microorganisms in Agricultural Fields and Agronomic Regulation Pathways

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