Abstract
Nitrogenase activity measured by acetylene reduction, was detected when surface-sterilized spores of vesicular-arbuscular (VA) mycorrhizal fungi (Glomus fasciculatum, G. intraradices, G. scientillans, G. mosseae, Gigaspora gilmorei andEndogone dusii) were inoculated into nitrogen-free liquid medium containing malic acid and incubated under microaerophilic conditions (99% N2+1% O2) at 30°C.Azospirillum species were isolated from the nitrogenase-active cultures.
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