Re: tissue culture jar question
That's a nice piece of equipment. Looks like you are planning big jobs.
You callus didn't grow most likely because of lack of auxins. By the way auxins disintegrate when exposed to light and heat. So you need to change the medium more often.
Did you control the light and temperature?
With the right variables in place you should obtain 3-6 bananans in 3 weeks from the right callus. Then subcultured.