Plants use proteins to carry out cellular functions like photosynthesis in chloroplasts (blue panel). In stress situations, such as a sudden increase in temperature, cause protein aggregation and hence chloroplast malfunction.  Chloroplast somehow senses the accumulation of aggregated proteins and generates a distress signal (Whatsapp message) that travels into the nucleus of the cell to activate the production of repair proteins, called chaperones. Chaperones disaggregate and unfold the proteins, favoring that they can be folded back correctly and recover their function.