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Appl. Environ. Microbiol., May 1995, 1843-1846, Vol 61, No. 5
Copyright © 1995, American Society for Microbiology

Further Evidence that the N(inf2)-Fixing Endophytic Bacterium from the Intercellular Spaces of Sugarcane Stems Is Acetobacter diazotrophicus

Z Dong, M Heydrich, K Bernard and ME McCully
Department of Biology, Carleton University, Ottawa, Ontario, Canada K1S 5B6; Departamento de Microbiologia, Universidad de La Habana, Havana, Cuba; and Laboratory Center for Disease Control, Tunneys Pasture, Ottawa, Ontario, Canada K1A 0L2

Nitrogen-fixing bacteria, isolated from the sugar solution in intercellular spaces of sugarcane stems, were compared with the type strain of Acetobacter diazotrophicus (PAL-5) and found to be congruent with it in all characters studied. These characters were 37 morphological and biochemical tests, cellular fatty acid composition, and nitrogenase activity. The nitrogenase activity was measured by acetylene reduction and H(inf2) evolution and found to be unusual in that the H(inf2) evolution was suppressed much less than expected by high concentrations of acetylene.

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