Electron-microscopic and genetic characterization of a Rickettsiella sp. infecting the manuka beetle, Pyronota setosa (Coleoptera: Scarabaeidae)

GND
1059093685
Zugehörigkeit
Julius Kühn-Institute (JKI), Federal Research Centre for Cultivated Plants, Institute for Biological Control, Darmstadt, Germany
Kleespies, Regina G.;
Zugehörigkeit
AgResearch Limited, Private Bag 4749, Christchurch 8140, New Zealand
Marshall, S.D.G.;
GND
1029424772
Zugehörigkeit
Julius Kühn-Institute (JKI), Federal Research Centre for Cultivated Plants, Institute for Biological Control, Darmstadt, Germany
Schuster, Christina;
Zugehörigkeit
AgResearch Limited, Private Bag 4749, Christchurch 8140, New Zealand
Townsend, R. J.;
Zugehörigkeit
AgResearch Limited, Private Bag 4749, Christchurch 8140, New Zealand
Jackson, T. A.;
GND
1175524018
Zugehörigkeit
Julius Kühn-Institute (JKI), Federal Research Centre for Cultivated Plants, Institute for Biological Control, Darmstadt, Germany
Leclerque, Andreas

Larvae of manuka beetles, Pyronota spp. (Coleoptera: Scarabaeidae) cause pasture damage in New Zealand by feeding on the roots of grasses. Surveys for potential biocontrol agents revealed a putative disease, expressed as whitened larvae of one of the outbreak species, Pyronota setosa. Microbial diagnosis indicated an intracoelomic, intracellular infection, and a previously unknown intracellular bacterium has been identified with subcellular structures characteristic of infection by Rickettsiella-like bacteria. These bacteria were rod-shaped, often slightly bent. Numerous associated protein crystals of variable size and shape occurred within round to oval shaped “giant bodies” either singly or as clusters of smaller crystals. Molecular phylogenetic analysis based on 16S ribosomal demonstrates that the manuka beetle pathogen belongs to the taxonomic genus Rickettsiella. Therefore, the pathotype designation `Rickettsiella pyronotae´ is proposed to refer to this organism. Moreover, genetic analysis makes it likely that - on the basis of the currently accepted organization of the genus Rickettsiella - this new pathotype should be considered a synonym of the nomenclatural type species, Rickettsiella popilliae.

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