Occurrence, hosts, morphology, and molecular characterisation of Pasteuria bacteria parasitic in nematodes of the family Plectidae

Parasitic bacteria of the genus Pasteuria are reported for three Anaplectus and four identified and several unidentified Plectus species found in eight countries in various habitats. The pasteurias from plectids agree in essential morphological characters of sporangia and endospores as well as in de...

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Bibliographic Details
Published in:Journal of invertebrate pathology 2005, Vol.88 (1), p.17-26
Main Authors: Sturhan, Dieter, Shutova, Tatyana S., Akimov, Vladimir N., Subbotin, Sergei A.
Format: Article
Language:English
Subjects:
16S rRNA sequence
Anaplectus
Animals
Bacterial parasite
Bacterial Physiological Phenomena
Base Sequence
Coevolution
Development
Distribution
DNA, Bacterial - analysis
Gram-Positive Endospore-Forming Bacteria - classification
Gram-Positive Endospore-Forming Bacteria - physiology
Host-Parasite Interactions
Hosts
Molecular Sequence Data
Morphology
Nematoda
Nematoda - parasitology
Nematodes
Pasteuria
Phylogeny
Plectidae
Plectus
Polymerase Chain Reaction
RNA, Ribosomal, 16S - genetics
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Summary:Parasitic bacteria of the genus Pasteuria are reported for three Anaplectus and four identified and several unidentified Plectus species found in eight countries in various habitats. The pasteurias from plectids agree in essential morphological characters of sporangia and endospores as well as in developmental cycle with those of the Pasteuria species and strains described from tylenchid nematodes, but appear to be mainly distinguished from these by absence of a distinct perisporium in the spores and the endospores obviously not being cup- or saucer-shaped. The wide range of measurements and morphological peculiarities of sporangia and endospores suggest that probably several Pasteuria species have to be distinguished as parasites in Plectidae. From an infected juvenile of an unidentified plectid species the 16S rRNA gene sequence of Pasteuria sp. was obtained. Substantial sequence divergence from described Pasteuria species and its phylogenetic position on molecular trees indicate that this Pasteuria sp. could be considered as a new species. Preliminary results of the analysis of DNA phylogeny of Pasteuria spp. and their nematode hosts provide evidence for incongruence of their phylogenetic history and of host switching events during evolution of the bacterial parasites.
ISSN:0022-2011
1096-0805
DOI:10.1016/j.jip.2004.11.001