here is what nebula said:
I have been talking to a company , (name removed) "which has been experimenting on tissue culture with cannabis plants, including autos. They said once an auto-flowering plant grown in tissue culture has made roots, it's like the clock has been reset and the plant starts growing and flowering on its own like an auto that's been grown from seed. They told me they don't know of a way to maintain the vegetative stage after that. The only thing you can do is start another culture once the buds have formed."