Five different species of arbuscular mycorrhizal fungi (AMF), three of which were isolated from hydrocarbon polluted soils (Glomus deserticola, G. geosporum and G. intraradices) and two labora-tory strains (G. fasciculatum and G. mosseae), were screened for symbiotic response with Medicago sativa L. (alfalfa) under greenhouse conditions in a hydrocarbon polluted substrate. Four of the 5 treatments were found to improve plant height and shoot biomass: G. deserticola isolated from gas-oil polluted soil from Mar de Ajó, G. geosporum isolated from fuel-oil polluted soil from Berisso, G. intraradices isolated from crude-oil polluted soil from Ensenada (Argentina), and Glomus fasciculatum (laboratory culture). A significant increase of phosporous and zinc content was only found in shoots and roots after treatment with AMF isolated from polluted areas.
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Marta Cabello (1999) studied this question.
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