Symbiotic essential amino acids provisioning in the American cockroach,Periplaneta americana(Linnaeus) under various dietary conditions

Ayayee, Paul A., Larsen, Thomas and Sabree, Zakee (2016) Symbiotic essential amino acids provisioning in the American cockroach,Periplaneta americana(Linnaeus) under various dietary conditions PeerJ, 4 . e2046. DOI 10.7717/peerj.2046.

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Abstract

Insect gut microbes have been shown to provide nutrients such as essential amino acids (EAAs) to their hosts. How this symbiotic nutrient provisioning tracks with the host’s demand is not well understood. In this study, we investigated microbial essential amino acid (EAA) provisioning in omnivorous American cockroaches (Periplaneta americana), fed low-quality (LQD) and comparatively higher-quality dog food (DF) diets using carbon stable isotope ratios of EAAs (δ13CEAA). We assessed non-dietary EAA input, quantified as isotopic offsets (Δ13C) between cockroach (δ13CCockroach EAA) and dietary (δ13CDietary EAA) EAAs, and subsequently determined biosynthetic origins of non-dietary EAAs in cockroaches using 13C-fingerprinting with dietary and representative bacterial and fungal δ13CEAA. Investigation of biosynthetic origins of de novo non-dietary EAAs indicated bacterial origins of EAA in cockroach appendage samples, and a mixture of fungal and bacterial EAA origins in gut filtrate samples for both LQD and DF-fed groups. We attribute the bacteria-derived EAAs in cockroach appendages to provisioning by the fat body residing obligate endosymbiont, Blattabacterium and gut-residing bacteria. The mixed signatures of gut filtrate samples are attributed to the presence of unassimilated dietary, as well as gut microbial (bacterial and fungal) EAAs. This study highlights the potential impacts of dietary quality on symbiotic EAA provisioning and the need for further studies investigating the interplay between host EAA demands, host dietary quality and symbiotic EAA provisioning in response to dietary sufficiency or deficiency.

Symbiotic essential amino acids provisioning in the American cockroach, Periplaneta americana (Linnaeus) under various dietary conditions (PDF Download Available). Available from: https://www.researchgate.net/publication/303311560_Symbiotic_essential_amino_acids_provisioning_in_the_American_cockroach_Periplaneta_americana_Linnaeus_under_various_dietary_conditions [accessed Jan 10 2018].

Document Type: Article
Keywords: Biochemistry Ecology Entomology Evolutionary Studies
Research affiliation: Kiel University > Kiel Marine Science
Kiel University
Refereed: Yes
DOI etc.: 10.7717/peerj.2046
ISSN: 2167-8359
Date Deposited: 10 Jan 2018 14:16
Last Modified: 27 Mar 2018 08:23
URI: http://eprints.uni-kiel.de/id/eprint/41387

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