Research Structure-function relationship of symplasmic transport in plants using non-invasive Bioimaging to visualize and quantify plant cell communication across plas­mo­des­mata. Development of methods to measure physiological parameters like pH and ions in single cell compartments. Analyzing favourable plant systems like grafted, parasitic and trans­formed plants with all relevant methods, including high resolution electron microscopy, reporter gene localiz­ation, cytochemistry, immunogold electron micro­scopy and immuno­fluorescence cytochemistry, confocal and 2-photon laser scanning microscopy, as well as super resolution microscopy (3D-SIM and Fluorescence Localisation Microscopy).