By Ada Hagan
George Washington Carver, probably without realizing it, was one of the first proponents of plant probiotics. Carver was a faculty member at the Tuskegee Institute in the early 1900’s and re-introduced the concept of crop rotation with peanuts, soy, and other legumes to U.S. agriculture. By alternating corn and cotton crops with peanuts, farmers could replenish the nutrients in the soil but continue harvesting a cash crop. Legumes are an intriguing type of plant since they rely on bacteria, such as Rhizobia, that grow in specialized nodules on their roots to provide them with nutrients, like nitrogen. In return, the plants supply the bacteria with sugars and oxygen for growth, a symbiotic exchange for nutrients the legumes cannot produce themselves.