Plant regulation of microbial enzyme production in situ |
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| Institution: | 1. University of Bonn, Institute of Crop Science and Resource Conservation - Soil Science and Soil Ecology, Nussallee 13, 53115 Bonn, Germany;2. Forschungszentrum Jülich GmbH, Agrosphere Institute (IBG-3), Wilhelm-Johnen-Straße, 52428 Jülich, Germany;1. Shanghai Academy of Landscape Architecture Science and Planning, NO. 899 Longwu Road, Shanghai 200232, China;2. Shanghai Engineering Research Center of Landscaping on Challenging Urban Sites, NO. 899 Longwu Road, Shanghai 200232, China;3. Shanghai Key Laboratory for Urban Ecological Processes and Eco-Restoration, East China Normal University, No. 500 Dongchuan Road, Shanghai 200241, China;4. Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, Coastal Ecosystems Research Station of the Yangtze River Estuary, and Shanghai Institute of Eco-Chongming, Fudan University, Shanghai 200438, China;1. Soil Ecology, University of Bayreuth, Bayreuth Center of Ecology and Environmental Research (BayCEER), Bayreuth, Germany;2. Department of Bio- and Environmental Sciences, International Institute Zittau, Technische Universität Dresden, Zittau, Germany;3. Department of Soil Ecology, UFZ – Helmholtz Centre for Environmental Research, Halle (Saale), Germany;4. Soil Biology, University Hohenheim, Stuttgart, Germany |
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| Abstract: | Soil extracellular enzymes regulate the rate at which complex organic forms of nitrogen (N) become bio-available. Much research has focused on the limitations to heterotrophic enzyme production via lab incubations, but little has been done to understand the limitations to enzyme production in situ. We created root and symbiotic mycelia exclusion treatments using mesh in-growth bags in the field to isolate the effect of roots and other portions of the microbial community on enzyme production. When fertilized with complex protein N we found increases in N-degrading enzyme concentrations only when root in-growth was allowed. No response was observed when complex N was added to root-free treatments. Expanding on economic rules of microbial element limitation theory developed from lab incubation data, we suggest this is due to active transport of labile carbon (C) from roots to associated microbial communities in root bags. Roots alleviate C limitation of microbial enzyme synthesis, representing a tradeoff between plants and microbes–plant C for microbially-derived N. |
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