Triggers stress-induced chloroplast degradation, independently of autophagy and senescence-associated vacuoles (PubMed:25538186). After targeting to the chloroplast, triggers its destabilization and subsequent disassembly, inducing the formation of CV-containing vesicles (CCVs) carrying stromal proteins, envelope membrane proteins, and thylakoid membrane proteins which are released from the chloroplasts and mobilized to the vacuole for proteolysis (PubMed:25538186). Interacts with the photosystem II subunit PsbO1 via its C-terminal region in the chloroplast thylakoid membrane and in CV-containing vesicles (CCVs). Present in vesicle-like spots observed in destabilized chloroplasts; these CV-containing vesicles (CCVs) carrying stromal proteins, envelope membrane proteins, and thylakoid membrane proteins translocate later to the cytosol before being mobilized to the vacuole for proteolysis. Mostly expressed in senescent and mature leaves but not in young leaves. Accumulates during senescence. Induced by abiotic stresses such as salt stress and methyl viologen (MV)-induced oxidative stress (PubMed:25538186). Triggered by NAC072/RD26 during senescence (PubMed:29659022). Down-regulated by cytokinin (PubMed:25538186). Delayed chloroplast turnover and senescence induced by abiotic stress and associated with an enhanced tolerance to drought, salinity, and oxidative stress.