If the A. tumefaciens were allowed to continue to grow, the culture would be overrun in a matter of weeks, killing the much slower growing plant tissue.
(the A. tumefaciens; were allowed; ) (the A. tumefaciens; to continue; to grow) (the A. tumefaciens; to grow; ) (the culture; would be overrun; L:in a matter of weeks)
the A. tumefaciens the A. tumefaciens the A. tumefaciens the culture
were allowed to continue to grow would be overrun
to grow
L:in a matter of weeks