Unlocking Soil's Potential Through Prebiotics' Application: Influences on Microbial community, Enzymatic Activity, and Metabolic Diversity
Résumé
Soil fertility and productivity face significant challenges due to exploitation, degradation, population growth, and climatic changes, necessitating innovative agroecological solutions. Prebiotics, a subset of biostimulants, have emerged as a promising approach to enhance soil conditions, promote plant growth, and potentially contribute to carbon (C) sequestration. This study assesses the effects of two prebiotics, K1® and NUTRIGEO L® (referred to as SPK and SPN, respectively), on agricultural soil cultivated with Zea mays L., compared to untreated control soil (SP). Analyses were conducted at two harvesting dates, three weeks (D1) and ten weeks (D2) post-application, evaluating plant growth, soil characteristics, microbial communities, enzyme activities, and metabolic diversity. Both prebiotics significantly improved soil physicochemical properties, with increased electrical conductivity, cation exchange capacity, and soluble phosphorus, while reducing nitrate levels. SPN also elevated key cationic minerals such as calcium and boron by D2. Each prebiotic treatment induced unique shifts in the abundance and diversity of bacterial and fungal communities, recruiting specific microbial taxa involved in plant growth promotion, saprotrophy, and symbiosis. SPK fostered bacteria such as Caulobacter and fungi like Mortierella globalpina, while SPN enriched microbial groups such as Neobacillus and Mortierella minutissima. Furthermore, prebiotics enhanced soil enzyme activities, with SPN increasing α-glucosidase and β-galactosidase, and SPK boosting arylsulfatase and phosphatase activities. These changes translated to improved plant biomass (with increases in shoot and root dry weights) and higher organic and total soil C content, particularly with SPN. Additionally, metabolic profiling revealed that SPK accelerated the degradation of multiple carbon sources across five groups, while SPN enhanced the decomposition of carbon sources from three groups. The cumulative effects of prebiotic treatments underscore their potential to enhance soil functional diversity, improve fertility, and contribute to sustainable agricultural practices.
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Cite 10.1007/s42729-023-01517-8 Autre Alahmad, A., Edelman, L., Castel, L., Bernardon-Mery, A., Laval, K., Trinsoutrot-Gattin, I., & Thioye, B. (2023). Prebiotics: A Solution for Improving Plant Growth, Soil Health, and Carbon Sequestration? Journal of Soil Science and Plant Nutrition, 23(4), 6647–6669. https://doi.org/10.1007/s42729-023-01517-8
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Cite 10.3390/agriculture14071115 Autre Alahmad, A., Edelman, L., Bouteiller, M., Castel, L., Riah-Anglet, W., Bennegadi-Laurent, N., Thioye, B., Bernardon-Mery, A., Laval, K., & Trinsoutrot-Gattin, I. (2024). Unveiling the Impact of Soil Prebiotics on Rhizospheric Microbial Functionality in Zea mays L. Agriculture, 14(7), 1115. https://doi.org/10.3390/agriculture14071115