Uptake of intact amino acids by plants depends on soil amino acid concentrations |
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| Authors: | L Sauheitl B Glaser A Weigelt |
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| Institution: | 1. University of Bayreuth, Soil Physics Section, Germany;2. Friedrich Schiller University Jena, Institute for Ecology, Germany;1. Department of Soil Science, College of Agriculture, Isfahan University of Technology, Isfahan 84156-83111, Iran;2. Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Iran;3. Institute of Terrestrial Ecosystems, ETH Zürich, Universitatstr. 16, 8092 Zürich, Switzerland;1. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China;2. College of Biology and Environment Engineering, Guiyang University, Guiyang 550005, China;3. Laboratory of Atmospheric Environment, Key Laboratory of Nuclear Resource and Environment, East China University of Technology, Nanchang 330013, China;4. Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;1. Faculty of Life Sciences, Michael Smith Building, University of Manchester, Oxford Road, Manchester M13 9PT, UK;2. School of the Environment, Natural Resources and Geography, College of Natural Sciences, Bangor University, Gwynedd LL57 2UW, UK;3. School of Biological Sciences, College of Natural Sciences, Bangor University, Gwynedd LL57 2UW, UK;1. Consiglio per la Ricerca e la Sperimentazione in Agricoltura – Centro di Ricerca per le Colture Industriali (CRA-CIN), Via di Corticella, 133, I-40128 Bologna, Italy;2. CSGI, Department of Chemistry, University of Florence, Via della Lastruccia 3, 50019 Firenze, Italy;3. Department of Pharmacy and Biotechnology, University of Bologna, Viale Risorgimento 4, 40136 Bologna, Italy;4. External Consultant, Italy;1. Key Laboratory of Environmental Remediation and Ecosystem Health, Minstry of Education/College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, P.R. China;2. Zhejiang Provincial Key Laboratory of Subtropical Soil and Plant Nutrition, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, P.R. China;3. Department of Crop and Soil Sciences, The Pennsylvania State University, PA 16802, USA |
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| Abstract: | Studies in different ecosystems have shown that plants take up intact amino acids directly but little is known about the influence of free amino acid concentrations in the soil on this process. We investigated the effect of three different soil amino acid N concentrations (0.025, 0.13 and 2.5 μg N g?1 soil) on direct uptake of four dual labelled (15N, 13C) amino acids (glycine, tyrosine, lysine, valine) in a greenhouse experiment using Anthoxantum odoratum as a model plant.Our results revealed that 8–45% of applied 15N was incorporated into plant root and shoot tissue 48 h after labelling. Additional 13C enrichment showed that 2–70% of this incorporated 15N was taken up as intact amino acid. Total 15N uptake and 15N uptake as intact amino acids were significantly affected by soil amino acid N concentrations and significantly differed between the four amino acids tested.We found a positive effect of soil amino acid concentrations on uptake of mineralized 15N relative to amino acid concentrations for all amino acids which was presumably due to higher diffusion rates of mineralized tracer to the root surface. However, intact amino acid uptake relative to amino acid concentrations as well as the proportion of total 15N taken up directly decreased with increasing soil amino acid N concentrations for all amino acids, irrespective of their microbial degradability. This effect is most likely controlled by the mineral N concentration in soil and perhaps in plants which inhibits direct amino acids uptake.Overall, we conclude that plant internal regulation of amino acid uptake controlled by mineral N is the main mechanism determining direct uptake of amino acids and thus a lower contribution of intact amino acid uptake to the plants N nutrition has to be expected for higher amino acid concentrations accompanied by mineralization in soil. |
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