
In plants, beneficial bacteria and fungi are endophytes. Scientists have known for decades that plants like legumes (peas, beans, and lentils) have beneficial bacteria in nodules attached to their roots. These bacteria “fix” vital nitrogen, turning it into a form the plant can easily use. However, researchers have recently found some nitrogen-fixing bacteria actually live inside plant tissue–in the leaves, stems, and roots — with impressive results.
http://feeds.sciencedaily.com/~r/sciencedaily/~3/RExL-5CSzfU/150708124612.htm