The GdR IBCO2 is a sponsor of this congress to promote networking and collaboration between groups from different disciplines working in the field of chloroplast biology. Among the works presented: key work from the laboratory of E. Flashman and F. Licausi on how plant cysteine dioxygenases sense and respond to oxygen. M. Holdsworth, N. Dissmeyer, D. Gibbs and Klaas van WijK will present new insights into plant substrates and the roles of N-degron pathways, particularly in plant chloroplasts. F. Theodoulou will present his work on the Arabidopsis UBR box protein, BIG, which plays a role in light signalling. The versatility of plastid N-terminal methionine excision and acetylation and it’s impact on photosynthetic proteins, including RUBISCO, will be presented by C. Giglione.