At the most basic level, endophyte simply means the location of an organism, with “endo” means “inside” and “phyte” means “plants”. Therefore, endophyte refers to organisms that live within plants (Wilson, 1995)[#Reference |[10]]]. Fungi and bacteria are the most common organisms associated with the term endophyte.
The photo on the right is showing enodphytic bacteria harbor within alfalfa. Every light spots on the photo represent a endophytic bacterial group.