Bradyrhizobium centrosemae (symbiovar centrosemae) sp. nov., Bradyrhizobium americanum (symbiovar phaseolarum) sp. nov. and a new symbiovar (tropici) of Bradyrhizobium viridifuturi establish symbiosis with Centrosema species native to America

1. Ramírez-Bahena, M.H.
2. Flores-Félix, J.D.
3. Chahboune, R.
4. Toro, M.
5. Velázquez, E.
6. Peix, A.