The concept of a dyson tree is a genetically engineered plant that can exist in vacuum conditions, and uses the raw materials found in extraterrestrial regolith (I.e. comets, asteroids etc) to produce oxygen and water. This is contained within a sealed chamber that can harbour astronauts and space colonists, so that the tree functions, effectively, as a living space colony.
It occurred to me that a similar life form could be used in terraforming mars or other planets assuming water is already present; they could create an oxygen atmosphere without needing oxygen themselves, and so could provide the basis for other, aerobic life forms.
However, i cannot find any specifics as to how such a life-form could work, so my question is: what biology would a plant need to survive without oxygen or co2, while still producing oxygen?