In plants, stress such as heat or cold can lead to reactive oxygen oxidizing certain proteins in the chloroplasts, the sites of photosynthesis, meaning that electrons are taken away from them. As a result, they are often no longer able to perform their task. A team of researchers led by our associated PI Professor Dr. Stefanie Müller-Schüssele has now discovered that an enzyme group, glutaredoxins, help to reduce this oxidative stress. If they are not present, the chloroplasts can only slowly restore the basic state in which the proteins are present in a reduced form. The study was published in the renowned journal “Redox Biology”. For details and a link to the publication please visit our post of January 8 ( and the RPTU press release of January 29, 2024. (Foto: RPTU, AG Müller-Schüssele; The fluorescence of biosensors makes it possible to track reduction and oxidation processes in living moss cells).