They are tiny signalling molecules that play important roles in many processes in living organisms. However, the exact function of these substances is often still unknown. International researchers have developed a method with which they can further investigate an important messenger substance in plants – phosphatidic acid. Using a new biosensor, they are able to track the activity of phosphatidic acid spatially and temporally for the first time. The method is also interesting for the investigation of plants that are exposed to stress such as salty soils. The study was published in „Nature Plants“.