Fourteenth seminar of the new Xylella Seminar Series jointly organised by the EU funded Bexyl project, EFSA (European Food Safety Authority) and Auburn University. Laurene Tetard, University Claude Bernard, France, gave a presentation entitled Tools for nanoscale functional analysis of complex and heterogeneous systems in plant and bacterial systems. Her research focuses on developing tools for nanoscale functional analysis of complex and heterogeneous systems related to sustainability, including plant and bacterial systems. To support the interpretation of varying signals detected at the nanoscale, her team also works on establishing connections with microscale and macroscale observations.