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水稻（Ｏｒｙｚａｓａｔｉｖｅ）接种根瘤菌后２～３ｄ，在显微镜下观察，水稻根表面和根毛上开始有根瘤菌吸附，根毛产生变形，末端膨大、微弯；接后４～７ｄ，粘附在根表和根毛上的根瘤菌密度加大，且不同水稻品种对根瘤菌的吸附情况有所不同。接后７～１４ｄ，根毛形成弯曲，大多数弯曲９０°～１８０°，少数根毛弯曲１８０°～３６０°，个别根毛产生分枝。不同水稻品种对接种根瘤菌产生的根毛变形和弯曲的效应也有所差异。水稻接种根瘤菌后３５～４５ｄ，根部形成短化、膨大的次生根瘤状结构。１３种稻／菌组合次生根瘤状结构的形成，表明这种瘤状结构的产生频率与稻／菌组合有密切关系
Rhizobia was inoculated 2 and 3 days after Oryzasative inoculation. Observed by microscope, Rhizobium began to adsorb on root surface and root hair of rice. The root hairs were deformed and their ends expanded and slightly curved. On the 4th and 7th day, And rhizobia on the root hair density increased, and different varieties of rice rhizobia adsorption situation is different. After 7 ~ 14d, the root hair formed a bend, most of the bend 90 ° ~ 180 °, a small number of root hair bent 180 ° ~ 360 °, individual root hair produce branching. The effects of different rice cultivars on the deformation and bending of root hair produced by Rhizobia were also different. Rhizobia inoculation rice 35 ~ 45d after the root formation of short, enlarged secondary root nodular structure. The formation of secondary nodular structures of thirteen combinations of rice / bacteria indicated that the frequency of occurrence of such nodules was closely related to the combination of rice / bacteria