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A survey for vesicular-arbuscular mycorrhizae(VAM) occurrence was undertaken in three endangeredvegetation sites in the area of Kudankulam atomic powerstation. Fifteen VAM fungal species were isolated from theroot-zone soils of fourteen different plant species. There wasa significant correlation observed between the number ofspores and of percentage root colonization as exemplified byPhyllanthus niruri and Paspalum vaginatum (450, 95%; 60,25%). Although VAM species are not known to be strictly sitespecific, the fact that Acaulospora elegans was observed onlyin site 1, Glomus pulvinatum in site 2 only, and Gl.intraradices in site 3 only, showed site-specificity in thisstudy. To confirm the infection efficiency, two host plantspecies in the sites, P. niruri and Eclipta alba, were selectedand inoculated in field with three selected VAM fungalspores. Gl. fasciculatum was found to be the most efficientVAM species in percentage root colonization, number ofVAM spores, and dry matter content. When the nutrients inroots of P. niruri and E. alba were analyzed, there was higheruptake of K (4.2 and 3.4 times, respectively) and Ca (5.3 and4.9 times, respectively), the analogues for 137Cs and 90Sr,respectively. From the results, it might be concluded thatVAM association helps the plants survive in a disturbedecosystem and enhances uptake and cycling of radionuclidesfrom the ecosystem.

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