Pasteuria strain S-1 was found to parasitize the sting nematode Belonolaimus longicaudatus. S-1 spores attached to several strains of B. longicaudatus from different geographical locations within the United States. However, they did not adhere to any of the following species: Heterodera schachtii, Longidorus africanus, Meloidogyne hapla, M. incognita, M. javanica, Pratylenchus brachyurus, P. scribneri, P. neglectus, P. penetrans, P. thornei, P. vulnus, and Xiphinema spp. The 16S rRNA genes from Pasteuria strain S-1 and P. penetrans strain Pp from Senegal were obtained by PCR amplification. A DNA sequence analysis showed that the S-1 16S rRNA had 96% or less similarity to the 16S rRNA genes from all previously reported Pasteuria species. Diverse phylogenetic methods all provided robust support for an association of Pasteuria strain S-1, Pasteuria strain NA parasitic to H. glycines, and P. penetrans strain Pp, to the exclusion of P. ramosa. In addition, our study showed intraspecific variation within P. penetrans as inferred by its 98% similarity to P. penetrans strain Pp.
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