Species of the genus Rhizobium have traditionally been considered as legume
endosymbionts and have generally been isolated from nodules on leguminous plants. More recently, novel species of this genus have also been found in different environments, such as Rhizobium selenitireducens and Rhizobium daejeonense isolated from bioreactors Rhizobium cellulosilyticum from sawdust of Populus alba,Rhizobium oryzae from wild rice andstrains of Rhizobium alamii from the rhizosphere of sunflowers