Both aboveground and underground parts of the plants constitute an excellent ecosystem for microbial activity and development (Bonaterra et al., 2003). In the numerous interactions between plants and soil, microorganisms play an integral and unique role in ecosystem functions such as decomposing, mineralizing organic matters and releasing as well as transforming inorganic nutrients. These microorganisms are among the most complex, diverse, and important assemblages in the rhizosphere. The rhizosphere is the soil–plant root interphase and, in practice, consists of the soil adhering to the root besides the loose soil surrounding it (Babalola, 2010a). The concept rhizosphere is also defined as the volume of soil surrounding a plant root in which very important and intensive interactions are taking place between soil, microorganisms, and plant roots. Roots provides an important habitat for bacteria, fungi, and very small soil animals. The rhizoplane is the plant root