Shotgun sequencing of hymenopteran inhabitants of rose galls reveals a surprising lack of bacteria

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Gobbo, Erik,1990-Stockholms universitet,Zoologiska institutionen,Naturhistoriska Riksmuseet,Ronquist Lab (author)

Shotgun sequencing of hymenopteran inhabitants of rose galls reveals a surprising lack of bacteria

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LIBRIS-ID:oai:DiVA.org:su-208465
https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-208465URI

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Language:English
Summary in:English

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Subject category:ovr swepub-publicationtype

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In recent years, our knowledge of the microbiomes associated with insects has increased rapidly thanks to new sequencing methods, but the taxonomic and biological diversity of the studied insect species is still limited. Insects inhabiting galls represent a particularly interesting ecological guild that has not yet had its microbiome fully characterized, although it is well known that many gall insects are infected by Wolbachia. Here, we use shotgun sequencing to characterize the microbiome of the larvae of four hymenopteran species inhabiting bedeguar galls on roses: the gall inducer (Diplolepis rosae, Cynipidae), a phytophagous inquiline (Periclistus brandtii, Cynipidae), and two parasitoids (Torymus bedeguaris, Torymidae, and Orthopelma mediator, Ichneumonidae). Analyses with Metaphlan2 detected the presence of Wolbachia in two of the larvae (one of three Diplolepis larvae, and one of two Torymus larvae); three other bacteria detected by Metaphlan2 in high abundance could be shown to be false positives. An annotation screen of the assembled genomes gave similar results. Almost all contigs that were likely to be of bacterial origin matched Wolbachia; the few remaining ones were likely false positives. Matching the assemblies to proteomes of candidate symbionts showed that the two infected larvae contained a substantial portion of the Wolbachia genome while the other Diplolepis and Torymus larvae only contained small sections of it. Our results suggest that the bedeguar gall is largely devoid of bacteria except for Wolbachia. This could potentially be related to previous reports that galls induced by cynipids produce antibiotics. Our results fail to support the much-discussed hypothesis that symbiotic bacteria are involved in gall induction in cynipids.

Subject headings and genre

microbiome
insect symbionts
gall wasps
gall induction
Cynipidae
Torymidae
Ichneumonidae
Animal Ecology
zooekologi

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Wheat, Christopher W.Stockholms universitet,Avdelningen för populationsgenetik,Avdelningen för zoologisk systematik och evolutionsforskning(Swepub:su)cwhea (author)
Ronquist, Fredrik,1962-Stockholms universitet,Zoologiska institutionen(Swepub:su)fronq (author)
Stockholms universitetZoologiska institutionen (creator_code:org_t)

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