Abstract
Symbionts are widely distributed in eukaryotes, and potentially affect the physiology, ecology and evolution of their host. Most insects harbour free-living bacteria in their haemocoel and gut lumen, intracellular-living bacteria in a range of tissues or bacteria in host-derived specialized cells. Stinkbugs, as do many arthropods, harbour extracellular bacteria in the gut that may affect the fitness of their host. This study identified the culturable symbionts associated with the ovaries, spermatheca, seminal vesicle and posterior midgut region (V4) of males and females of Euschistus heros (F.) (Hemiptera: Pentatomidae). Several culture media were used to isolate the bacteria associated with these structures. The selected colonies (morphotypes) were cultured in liquid medium, subjected to genomic DNA extraction, 16S rRNA gene amplification, and restriction fragment length polymorphism (RFLP) analyses. Morphotypes with distinct RFLP patterns were purified and sequenced, and the sequences obtained were used for putative identification and phylogenetic analysis. Comparison of the sequences with those available in the EzTaxon-e database and the use of a matrix of paired distances grouped the isolates in phylotypes belonging to the Phylum Proteobacteria. Proteobacteria was represented by γ-Proteobacteria phylotypes belonging to Enterobacteriaceae, while Firmicutes had Bacilli phylotypes distributed in Enterococcaceae and Staphylococcaceae. Some of the phylotypes identified were associated exclusively with single structures, such as ovaries, spermatheca and the V4 midgut region of males and females. All culturable bacteria associated with the seminal vesicle were also associated with other tissues.
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Acknowledgements
To Dr. Crébio José Ávila, researcher at Embrapa Agropecuária Oeste, for hosting and helping in locating fields for sample collection. Authors also acknowledge the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq-Brazil; Grant #140652/2013-2) for providing a fellowship to the first author, and Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP, Grant 2011/50877-0) for providing research funds to the senior author.
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Scopel, W., Cônsoli, F.L. Culturable symbionts associated with the reproductive and digestive tissues of the Neotropical brown stinkbug Euschistus heros. Antonie van Leeuwenhoek 111, 2413–2424 (2018). https://doi.org/10.1007/s10482-018-1130-9
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DOI: https://doi.org/10.1007/s10482-018-1130-9