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• W4210378639 abstract "ABSTRACT Soil matrix properties influence microbial behaviors that underlie nutrient cycling, greenhouse gas production, and soil formation. However, the dynamic and heterogeneous nature of soils makes it challenging to untangle the effects of different matrix properties on microbial behaviors. To address this challenge, we developed a tunable artificial soil recipe and used these materials to study the abiotic mechanisms driving soil microbial growth and communication. When we used standardized matrices with varying textures to culture gas-reporting biosensors, we found that Gram-negative bacteria grew best in synthetic silt soils, remaining active over a wide range of soil matric potentials, while Gram-positive bacteria preferred sandy soils, sporulating at a low water potentials. Soil texture, mineralogy, and alkalinity all attenuated the bioavailability of an acyl-homoserine lactone (AHL) signaling molecule that controls community-level microbial behaviors. Texture controlled the timing of AHL sensing, while AHL bioavailability was decreased ∼10 5 -fold by mineralogy and ∼10 3 -fold by alkalinity. Finally, we built artificial soils with a range of complexities that converge on the properties of one Mollisol. As artificial soil complexity increased to more closely resemble the Mollisol, microbial behaviors approached those occurring in the natural soil, with the notable exception of organic matter. Properties that behaved additively were soil texture, pH, and mineralogy, while organic matter did not, suggesting that its soil behavior is an emergent property. IMPORTANCE Understanding environmental controls on soil microbes is difficult because many abiotic parameters vary simultaneously and uncontrollably when different natural soils are compared, preventing mechanistic determination of any individual soil parameter’s effect on microbial behaviors. We describe how soil texture, mineralogy, pH, and organic matter content can be varied individually within artificial soils to study their effects on soil microbes. Using microbial biosensors that report by producing a rare indicator gas, we identify soil properties that control microbial growth and attenuate the bioavailability of a diffusible chemical used to control community-level behaviors. We find that artificial soils differentially affect signal bioavailability and the growth of Gram-negative and Gram-positive microbes. We show that some soil properties have additive effects on signal bioavailability, while others exhibit emergent properties. These artificial soils are useful for studying the mechanisms that underlie soil controls on microbial fitness, signaling, and gene transfer." @default.
• W4210378639 created "2022-02-08" @default.
• W4210378639 creator A5004030260 @default.
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• W4210378639 creator A5024344333 @default.
• W4210378639 creator A5067862970 @default.
• W4210378639 date "2022-02-04" @default.
• W4210378639 modified "2023-09-25" @default.
• W4210378639 title "Artificial soils reveal individual factor controls on microbial processes" @default.
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• W4210378639 doi "https://doi.org/10.1101/2022.02.01.478713" @default.
• W4210378639 hasPublicationYear "2022" @default.
• W4210378639 type Work @default.

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