Azospirillum amazonense is a widespread N2 fixing bacterium, occurring mainly in association with grasses and palm trees roots. Aiming to study its occurrence in species of other families not yet studied and the efficiency of media. Fam and LGI for its detection, these were used for rhizosphere soil counting or for enrichment cultures of rhizosphere soil, ecto and endorhizosphere. A. amazonense was detected in rhizosphere soil, ecto and endorhizosphere of many species belonging to monocotyledons, including Orchidaceae and dicotyledons with. Fam medium being the most efficient for its detection.
diazotrophs; microbial ecology; nitrogen fixation