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Heritability of symbiont density reveals distinct regulatory mechanisms in a tripartite symbiosis

Beneficial eukaryotic–bacterial partnerships are integral to animal and plant evolution. Understanding the density regulation mechanisms behind bacterial symbiosis is essential to elucidating the functional balance between hosts and symbionts. Citrus mealybugs, Planococcus citri (Risso), present an...

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Autores principales: Parkinson, Jasmine F., Gobin, Bruno, Hughes, William O. H.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4831439/
https://www.ncbi.nlm.nih.gov/pubmed/27099709
http://dx.doi.org/10.1002/ece3.2005
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author Parkinson, Jasmine F.
Gobin, Bruno
Hughes, William O. H.
author_facet Parkinson, Jasmine F.
Gobin, Bruno
Hughes, William O. H.
author_sort Parkinson, Jasmine F.
collection PubMed
description Beneficial eukaryotic–bacterial partnerships are integral to animal and plant evolution. Understanding the density regulation mechanisms behind bacterial symbiosis is essential to elucidating the functional balance between hosts and symbionts. Citrus mealybugs, Planococcus citri (Risso), present an excellent model system for investigating the mechanisms of symbiont density regulation. They contain two obligate nutritional symbionts, Moranella endobia, which resides inside Tremblaya princeps, which has been maternally transmitted for 100–200 million years. We investigate whether host genotype may influence symbiont density by crossing mealybugs from two inbred laboratory‐reared populations that differ substantially in their symbiont density to create hybrids. The density of the M. endobia symbiont in the hybrid hosts matched that of the maternal parent population, in keeping with density being determined either by the symbiont or the maternal genotype. However, the density of the T. princeps symbiont was influenced by the paternal host genotype. The greater dependency of T. princeps on its host may be due to its highly reduced genome. The decoupling of T. princeps and M. endobia densities, in spite of their intimate association, suggests that distinct regulatory mechanisms can be at work in symbiotic partnerships, even when they are obligate and mutualistic.
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spelling pubmed-48314392016-04-20 Heritability of symbiont density reveals distinct regulatory mechanisms in a tripartite symbiosis Parkinson, Jasmine F. Gobin, Bruno Hughes, William O. H. Ecol Evol Original Research Beneficial eukaryotic–bacterial partnerships are integral to animal and plant evolution. Understanding the density regulation mechanisms behind bacterial symbiosis is essential to elucidating the functional balance between hosts and symbionts. Citrus mealybugs, Planococcus citri (Risso), present an excellent model system for investigating the mechanisms of symbiont density regulation. They contain two obligate nutritional symbionts, Moranella endobia, which resides inside Tremblaya princeps, which has been maternally transmitted for 100–200 million years. We investigate whether host genotype may influence symbiont density by crossing mealybugs from two inbred laboratory‐reared populations that differ substantially in their symbiont density to create hybrids. The density of the M. endobia symbiont in the hybrid hosts matched that of the maternal parent population, in keeping with density being determined either by the symbiont or the maternal genotype. However, the density of the T. princeps symbiont was influenced by the paternal host genotype. The greater dependency of T. princeps on its host may be due to its highly reduced genome. The decoupling of T. princeps and M. endobia densities, in spite of their intimate association, suggests that distinct regulatory mechanisms can be at work in symbiotic partnerships, even when they are obligate and mutualistic. John Wiley and Sons Inc. 2016-02-26 /pmc/articles/PMC4831439/ /pubmed/27099709 http://dx.doi.org/10.1002/ece3.2005 Text en © 2016 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution (http://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Research
Parkinson, Jasmine F.
Gobin, Bruno
Hughes, William O. H.
Heritability of symbiont density reveals distinct regulatory mechanisms in a tripartite symbiosis
title Heritability of symbiont density reveals distinct regulatory mechanisms in a tripartite symbiosis
title_full Heritability of symbiont density reveals distinct regulatory mechanisms in a tripartite symbiosis
title_fullStr Heritability of symbiont density reveals distinct regulatory mechanisms in a tripartite symbiosis
title_full_unstemmed Heritability of symbiont density reveals distinct regulatory mechanisms in a tripartite symbiosis
title_short Heritability of symbiont density reveals distinct regulatory mechanisms in a tripartite symbiosis
title_sort heritability of symbiont density reveals distinct regulatory mechanisms in a tripartite symbiosis
topic Original Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4831439/
https://www.ncbi.nlm.nih.gov/pubmed/27099709
http://dx.doi.org/10.1002/ece3.2005
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