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Greenhouse pot experiments were carried out to Know the effect of four Arbuscular mycorrhizal
(AM) fungi. Gigaspora margarita, Scutellospora nigra, Glomus mosseae and Glomus macrocarpum.
The results revealed variedly with different AM fungi, experimental pots were maintained in sterile
soil. The mycorrhizal inoculation greatly influence on plant growth, root length, fresh and dry
weight of shoot and root, the dependency of Brassica plants to AM fungi and per cent root
colonization and spore number was increased, after the inoculation of Glomus macrocarpum over
the three other AM fungal strains. Thus Glomus macrocarpum the best microbial consortium for
inoculating Brassica juncea seeds before sowing to get better seedling vigour and seed number.
Key words: Brassica juncea (L.) Czern & Coss. Arbuscular mycorrhizal (AM) fungi, Glomus macrocarpum, biomass production, Per cent root colonization.