Abstract
Azospirillum isolates were obtained from rhizosphere soil and roots of three cactaceae species growing under arid conditions. All Azospirillum isolates from rhizosphere and roots ofStenocereus pruinosus andStenocereus stellatus were identified asA. brasilense; isolates of surface-sterilized roots fromOpuntia ficus-indica were bothA. brasilense andA. lipoferum. Azospirilla per g of fresh root in the three species ranged from 70×103 to 11×103. The most active strains in terms of C2H2 reduction (25–49.6 nmol/h·ml) and indoleacetic acid (IAA) production (36.5–77 μg/ml) were those identified asA. brasilense and isolated from Stenocereus roots.A. lipoferum isolated from Opuntia roots produced low amounts of IAA (6.5–17.5 μg/ml) and low C2H2-reduction activity (17.8–21.2 nmol/h·ml).
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Mascarua-Esparza, M.A., Villa-Gonzalez, R. & Caballero-Mellado, J. Acetylene reduction and indoleacetic acid production by Azospirillum isolates from Cactaceous plants. Plant Soil 106, 91–95 (1988). https://doi.org/10.1007/BF02371199
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DOI: https://doi.org/10.1007/BF02371199