Abstract
Encystment of Azotobacter nigricans was induced by its diazotrophic cultivation on kerosene. Its growth and nitrogenase activity were affected by kerosene in comparison to cultures grown on sucrose. Electron microscopy of vegetative cells showed that when nitrogenase activity was higher and the poly-β-hydroxybutyrate granules were not present to a significant extent, peripheral bodies were abundant. After 8 days of culture on kerosene, the presence of cysts with intracellular bunches of poly-β-hydroxybutyrate granules was observed. Germination of cysts bears germinating multicelled yet unbroken capsule cysts with up to three cells inside. This is the first report of encystment induction of Azotobacter species grown on kerosene.
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Acknowledgments
Special acknowledgment is given to Victoria Teresita Velásquez Martínez and Ma. De Lourdes Rojas for their technical assistance in the microscopic studies. The first author, Gabriela Garcia Esquivel, acknowledges a doctoral fellowship (124460) from CONACyT.
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Communicated by Mary Allen.
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García-Esquivel, G., Calva-Calva, G., Ferrera-Cerrato, R. et al. Encystment of Azotobacter nigricans grown diazotrophically on kerosene as sole carbon source. Arch Microbiol 191, 275–281 (2009). https://doi.org/10.1007/s00203-008-0444-9
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DOI: https://doi.org/10.1007/s00203-008-0444-9