Our research is focussing on agricultural and marine photosynthetic organisms interacting with heterotrophic microorganisms. From Ocean to Chocolate, from ornamental plants, such as Rhododendron, to oyster pathogens - we are widely interested how higher organisms interact and benefit from bacterial model organisms. We use both, metabolomic and cell-to-cell interaction approaches. Bioactive compounds from Rhododendron are of particular importance. We study secondary metabolites of Rhododendron, their inducibility, and their mode of actions on bacterial cells.