Abstract: Rice and branyardgrass were treated by rhizobium mutant of sesbania, Cucumis melo var inodorous was treated by rhizobium and magnetic field.Microscope observations showed that regular deformation occured on the root hairs of these three non-leguminous plants, the root hairs curled, expanded and branched, and infection threads were formed.At the same time the nodules were discovered on roots of rice and Cucumis melo var inodorous.All of the plants were similar to the leguminous plant roots.It is a important sign for establishment of symbiotic association between rhizobia and non-leguminous plants.

Key words: Rhizobium sesbania, Mutant, Rice, Branyardgrass, Cucumis melo var inodorous, Root hairs, Root nodules