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The diversity of Arbuscular Mycorrhizal fungal distribution was studied in the coastal region of
Manapaadu near Tiruchendur of Tamil Nadu. AM-Fungi are ubiquitous and form a mutual
relationship with roots of most plant species. Spores and sporocarps present in the coastal sand
were isolated by using the decanting and wet-sieving technique. Totally 36 species of AM spores
belonging to genera viz. Acaulospora, Diversispora, Entrophosphora, Gigaspora, Glomus,
Rhizophagus, Sclerocystis and Septaglomus were isolated from the rhizosphere soil of Manapaddu
coastal region. The distribution of AM spores in soil is governed by edaphic factors like soil pH and
E.C. were measured under laboratory conditions. The occurrence of AM fungi in soil favours the
growth of plants and also which were mainly involved in the soil aggregation.
Key words: Arbuscular Mycorrhiza, AM diversity, AM-spores, soil pH and E.C.