caa a22 4500 606218858 CHVBK 20210128101115.0 cr unu---uuuuu 210128e20150501xx s 000 0 eng 10.1007/s11104-015-2382-z doi (NATIONALLICENCE)springer-10.1007/s11104-015-2382-z O2 dynamics in the rhizosphere of young rice plants ( Oryza sativa L.) as studied by planar optodes [Elektronische Daten] [Morten Larsen, Jakob Santner, Eva Oburger, Walter Wenzel, Ronnie Glud] Background and aims: Radial O2 loss (ROL) strongly affect the O2 availability in the rhizosphere of rice. The ROL create an oxic zone around the roots, protecting the plant from toxic reduced chemical species and regulates the redox chemistry in the soil. This study investigates the spatio-temporal variability in O2 dynamics in the rice rhizosphere. Method: Applying high-resolution planar optode imaging, we investigated the O2 dynamics of plants grown in watersaturated soil, as a function of ambient O2 level, irradiance and plant development, for submerged and emerged plants. Results: O2 leakage was heterogeneously distributed with zones of intense leakage around roots tips and young developing roots. While the majority of roots exhibited high ROL others remained surrounded by anoxic soil. ROL was affected by ambient O2 levels around the plant, as well as irradiance, indicating a direct influence of photosynthetic activity on ROL. At onset of darkness, oxia in the rhizosphere was drastically reduced, but subsequentlyoxiagradually increased, presumably as root and/or soil respiration declined. Conclusion: The study demonstrates a high spatio-temporal heterogeneity in rhizosphere O2 dynamics and difference in ROL between different parts of the rhizosphere. The work documents that spatio-temporal measurements are important to fully understand and account for the highly variable O2 dynamics and associated biogeochemical processes and pathways in the rice rhizosphere. The Author(s), 2015 Planar optode nationallicence Rice ( Oryza sativa L.) nationallicence Radial oxygen loss nationallicence Rhizosphere nationallicence Plaques imaging nationallicence Oxygen nationallicence Larsen Morten Institute of Biology and Nordic Center for Earth Evolution (NordCEE), University of Southern Denmark, 5320, Odense M, Denmark aut Santner Jakob Rhizosphere Ecology and Biogeochemistry Group, Institute of Soil Science, Department of Forest and Soil Sciences, University of Natural Resources and Life Sciences Vienna, 3430, Tulln, Austria aut Oburger Eva Rhizosphere Ecology and Biogeochemistry Group, Institute of Soil Science, Department of Forest and Soil Sciences, University of Natural Resources and Life Sciences Vienna, 3430, Tulln, Austria aut Wenzel Walter Rhizosphere Ecology and Biogeochemistry Group, Institute of Soil Science, Department of Forest and Soil Sciences, University of Natural Resources and Life Sciences Vienna, 3430, Tulln, Austria aut Glud Ronnie Institute of Biology and Nordic Center for Earth Evolution (NordCEE), University of Southern Denmark, 5320, Odense M, Denmark aut Plant and Soil Springer International Publishing 390/1-2(2015-05-01), 279-292 0032-079X 390:1-2<279 2015 390 11104 https://doi.org/10.1007/s11104-015-2382-z text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11104-015-2382-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Larsen Morten Institute of Biology and Nordic Center for Earth Evolution (NordCEE), University of Southern Denmark, 5320, Odense M, Denmark aut NATIONALLICENCE 700 1- Santner Jakob Rhizosphere Ecology and Biogeochemistry Group, Institute of Soil Science, Department of Forest and Soil Sciences, University of Natural Resources and Life Sciences Vienna, 3430, Tulln, Austria aut NATIONALLICENCE 700 1- Oburger Eva Rhizosphere Ecology and Biogeochemistry Group, Institute of Soil Science, Department of Forest and Soil Sciences, University of Natural Resources and Life Sciences Vienna, 3430, Tulln, Austria aut NATIONALLICENCE 700 1- Wenzel Walter Rhizosphere Ecology and Biogeochemistry Group, Institute of Soil Science, Department of Forest and Soil Sciences, University of Natural Resources and Life Sciences Vienna, 3430, Tulln, Austria aut NATIONALLICENCE 700 1- Glud Ronnie Institute of Biology and Nordic Center for Earth Evolution (NordCEE), University of Southern Denmark, 5320, Odense M, Denmark aut NATIONALLICENCE 773 0- Plant and Soil Springer International Publishing 390/1-2(2015-05-01), 279-292 0032-079X 390:1-2<279 2015 390 11104