NDLI: Symbiotic bacteria associated with gut symbiotic organs and female genital accessory organs of the leaf beetle Bromius obscurus (Coleoptera: Chrysomelidae)

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Symbiotic bacteria associated with gut symbiotic organs and female genital accessory organs of the leaf beetle Bromius obscurus (Coleoptera: Chrysomelidae)

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Symbiotic bacteria associated with gut symbiotic organs and female genital accessory organs of the leaf beetle Bromius obscurus (Coleoptera: Chrysomelidae)

Content Provider	Springer Nature Link
Author	Fukumori, Kayoko Koga, Ryuichi Nikoh, Naruo Fukatsu, Takema
Copyright Year	2017
Abstract	Leaf beetles (Coleoptera: Chrysomelidae) constitute one of the most species-rich insect families, and live exclusively on leaves or other plant parts. Early histological works described the presence of symbiotic bacteria in gut-associated symbiotic organs of some chrysomelid species, but their microbiological nature has been poorly characterized except for those associated with reed beetles of the subfamily Donaciinae. Here we investigated symbiotic bacteria of the leaf beetle Bromius obscurus (L.) belonging to the subfamily Eumolpinae. Specific bacterial 16S ribosomal RNA and gyrB gene sequences were consistently obtained from the symbiotic organs, which radially surround the foregut-midgut junction, of all adult males and females examined. In adult females, the same sequences were also obtained from a pair of genital accessory organs, which are presumably for vertical symbiont transmission. Whole mount in situ hybridization specifically detected the symbiont in the gut symbiotic organs endocellularly and also in the female genital accessory organs extracellularly. In the gut symbiotic organs, the endocellular symbiont cells were small and rosette-like or aggregated and granule-like, whereas in the female genital organs the extracellular symbiont cells were of a condensed form. Molecular phylogenetic analysis showed that the symbiont of B. obscurus constitutes a distinct lineage in the Gammaproteobacteria. Molecular evolutionary analysis has identified significantly accelerated molecular evolution and a highly adenine–thymine-biased nucleotide composition of the symbiont genes, presumably reflecting reductive evolution of the symbiont genome. These results suggest an intimate and stable host-symbiont association in B. obscurus, in which the symbiont may play some important, though hitherto unknown, biological roles in its herbivorous insect host.
Starting Page	589
Ending Page	598
Page Count	10
File Format	PDF
ISSN	00036862
Journal	Applied Entomology and Zoology
Volume Number	52
Issue Number	4
e-ISSN	1347605X
Language	English
Publisher	Springer Japan
Publisher Date	2017-08-07
Publisher Place	Tokyo
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Bacterial symbiont Gammaproteobacteria Transmission organ Molecular phylogenetic analysis Entomology Agriculture Applied Ecology Plant Pathology Zoology Environmental Management
Content Type	Text
Resource Type	Article
Subject	Insect Science

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