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1 University of Florida IFAS, Fort Lauderdale Research and Education Center, 3205 College Avenue, Fort Lauderdale, FL 33314-7719, USA
2 Microbiology and Cell Science, University of Florida, PO Box 110700, Gainesville, FL 32611-0700, USA
3 Department of Crop Science, University of Illinois, AW-101 Turner Hall, 1102 South Goodwin Avenue, Urbana, IL 61801-4798, USA
4 Department of Entomology and Nematology, University of Florida IFAS, PO Box 110620, Gainesville, FL 32611-0620, USA
5 Department of Nematology, University of California, Riverside, CA 92521, USA
Correspondence
R. M. Giblin-Davis
giblin{at}ufl.edu
Taxonomically relevant characteristics of a fastidiously Gram-positive, obligately endoparasitic prokaryote (strain S-1) that uses the phytoparasitic sting nematode Belonolaimus longicaudatus as its host are reviewed. 16S rDNA sequence similarity (
93 %) confirms its congeneric ranking with other Pasteuria species and strains from nematodes and cladocerans and corroborates morphological, morphometric and host range evidence suggesting a novel taxon. The 16S rDNA sequence of strain S-1 has greatest similarity (96 %) to the 16S rDNA sequences of both Pasteuria penetrans from root-knot nematodes (Meloidogyne species) and the recently reported strain of Pasteuria isolated from the soybean cyst nematode Heterodera glycines. Because the obligately endoparasitic nature of prokaryotes in the genus Pasteuria prevents isolation of definitive type strains, strain S-1 is proposed as Candidatus Pasteuria usgae sp. nov.
The GenBank accession number for the 16S rDNA sequence of strain S-1 is AF254387.
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