Obligately microaerophilic, nitrogen-fixing bacteria were found associated with roots of Loisel and in root-associated sediments from salt marshes in Nova Scotia, Canada, and Georgia. These bacteria differ from previously described species and thus represent a new species. The cells of all strains which we studied are small, rigid, curved, motile, and rod shaped and have single polar flagella. Metabolism is respiratory, and the strains utilize organic and amino acids, but not carbohydrates, as sole carbon sources. Poly-β-hydroxybutyrate is not produced. These traits and the guanine-plus-cytosine contents of the deoxyribonucleic acids of these strains (28.3 ± 0.1 mol%) indicate that they are members of the genus Sebald and Veron 1963. However, these strains can be distinguished from the previously described species of by the presence of nitrogenase, by their tolerance of and apparent requirement for NaCl, by the production of pigment from tryptophan, by a combination of other biochemical traits, and by their association with plant roots. Therefore, we propose that these strains represent a new species, , and we designate strain CI (= ATCC 33309) as the type strain.


Article metrics loading...

Loading full text...

Full text loading...


Most cited this month Most Cited RSS feed

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error