Several Microorganisms on or in Rice Roots

Several kinds of microorganisms were found on the surface or in the tissues and cells of rice roots sampled in the paddy fields of Yamagata Prefecture. A kind of these microorganisms was sphere in shape like sporangium about 20μ in diameter, in which very small granules were compacted. This microorganism, which was presumed to be aerobic, was observed only on the apical parts of root hairs, but not on other epidermal surface, i. e. it had more intimate relation with root hairs than other epidermal cells. It is assumed from this observation that root hairs have better ability to oxidize the rhizosphere than that of other epidermal cells. Furthermore, the authors isolated some Fusarium spp., yeast and bacteria from rice roots.