title: An imaging method for oxygen distribution, respiration and photosynthesis at a microscopic level of resolution.
abstract: Biological samples are far from homogeneous, with complex compartmentation being the norm. Major physiological processes such as respiration do not therefore occur in a uniform manner within most tissues, and it is currently not possible to image its gradients in living plant tissues. A compact fluorescence ratiometric-based device is presented here, consisting of an oxygen-sensitive foil and a USB (universal serial bus) microscope. The sensor foil is placed on the sample surface and, based on the localized change in fluorescence signal over time, information about the oxygen consumption (respiration) or evolution (photosynthesis) can be obtained. Using this imaging technique, it was possible to demonstrate the spatial pattern of oxygen production and consumption at a c. 20-μm level of resolution, and their visualization in the rhizosphere, stem and leaf, and within the developing seed. The oxygen mapping highlighted the vascular tissues as the major stem sink for oxygen. In the leaf, the level of spatial resolution was sufficient to visualize the gas exchange in individual stomata. We conclude that the novel sensor set-up can visualize gradients in oxygen-consuming and producing processes, thereby facilitating the study of the spatial dynamics of respiration and photosynthesis in heterogeneous plant tissues.
authors.affiliation: Department of Molecular Genetics, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Corrensstr. 3, D-06466, Gatersleben, Germany.
authors.forename: Henning
authors.initials: H
authors.lastname: Tschiersch
authors.affiliation: PreSens Precision Sensing GmbH, Josef-Engert-Strasse 11, 93053, Regensburg, Germany.
authors.forename: Gregor
authors.initials: G
authors.lastname: Liebsch
authors.affiliation: Department of Molecular Genetics, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Corrensstr. 3, D-06466, Gatersleben, Germany.
authors.forename: Ljudmilla
authors.initials: L
authors.lastname: Borisjuk
authors.affiliation: PreSens Precision Sensing GmbH, Josef-Engert-Strasse 11, 93053, Regensburg, Germany.
authors.forename: Achim
authors.initials: A
authors.lastname: Stangelmayer
authors.affiliation: Department of Molecular Genetics, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Corrensstr. 3, D-06466, Gatersleben, Germany.
authors.forename: Hardy
authors.initials: H
authors.lastname: Rolletschek
mesh_terms: D031002:Acer / Q000378:metabolism / Q000382:microbiology; D001203:Ascomycota / Q000472:pathogenicity; D029688:Brassica napus / Q000378:metabolism; D019069:Cell Respiration; D002734:Chlorophyll / Q000378:metabolism; D001467:Hordeum / Q000378:metabolism; D008856:Microscopy, Fluorescence / Q000295:instrumentation / Q000379:methods*; D010100:Oxygen / Q000378:metabolism*; D010788:Photosynthesis; D010935:Plant Diseases / Q000382:microbiology; D018515:Plant Leaves / Q000033:anatomy & histology / Q000378:metabolism; D018547:Plant Stems / Q000033:anatomy & histology / Q000378:metabolism; D054046:Plant Stomata / Q000378:metabolism; D058441:Rhizosphere; D012639:Seeds / Q000033:anatomy & histology / Q000378:metabolism; D013997:Time Factors; D003313:Zea mays / Q000033:anatomy & histology / Q000378:metabolism
chemical_list: D002734:Chlorophyll; D010100:Oxygen