Interaction between symbiosis and root pathogenesis in green gram (Vigna radiata L. Welczek)

Summary A pot experiment, using cowpea Rhizobium and one percent inoculum ofRhizoctonia botaticola (Taub.) Butler was carried out on green gram (Vigna radiata cv. PS 16) to study the interaction between symbiosis and root rot in terms of plant growth and nitrogen fixation. The microtomy of the infected roots showed distortion of the outer layers of root as a possible cause for antagonistic interaction of these two bio-processes.