Azospirillum can directly or indirectly stimulate growth of plants and improve yield of at least several plant species. Structural distinctions LPS O-antigen determinate antigen variations Azospirillum species. Thirty eight strains of Azospirillum were screening. The fact that most research strains demonstrated cross-reactions with model strains underlie the division into three serotypes, including eight serovariants. Seven strains demonstrated cross-reactions only with genus-specific antibodies and have been separated into individual group.
