Uptake, efflux and conversion of radiolabelled substrates by cells and plant organs

We will quantify uptake rates of radioisotopes of various mineral nutrients and/or their toxic analogues into roots of Arabidopsis or into plant gene-expressing cells. We will measure the incorporation of radiolabelled organic and inorganic substrates into endogenous metabolites and/or macromolecules of plant cells, organs and/or cells of heterologous expression systems. We will localize various elements of interest in sections of plant tissues by imaging using Particle Induced X-Ray Emission (PIXE) combined with Rutherford Backscattering Spectrometry (RBS) comparatively between wild type and mutant/transgenic plants. We will conduct live cell imaging of plant cells expressing suitably marker proteins using the Olympus IX 81 live cell imaging microscope with the goal of determining protein localization and its dynamics. It is possible that it might be necessary to apply STED super-resolution fluorescence imaging to answer our research questions.