PLANTS. “Plant cells, that have, in addition to mitochondria, another endosymbiotic organelle of cyanobacterial origin, the chloroplast. Do chloroplasts play a role in the regulation of plant programmed cell death? And since an AP-ATPase, a metacaspase and a TIR domain have been identified in cyanobacteria (as in some other bacterial lineages), did plants acquire their putative homologues of the apoptotic machinery through this endosymbiotic process?”
http://www.nature.com/cdd/journal/v9/n4/full/4400950a.html