Herbaspirillum autotrophicum is a bacterium which cannot fix nitrogen under laboratory conditions, like Herbaspirillum seropedicae, because it does not have the Nif gene.http://www.sgm.ac.uk/IJSEM/PiP/ijsem02975.pdf
References
External links Type strain of Herbaspirillum autotrophicum at BacDive - the Bacterial Diversity Metadatabase