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Aphid genotypes vary in their response to the presence of fungal endosymbionts in host plants


Bieri, A P S; Härri, S A; Vorburger, C; Müller, C B (2009). Aphid genotypes vary in their response to the presence of fungal endosymbionts in host plants. Journal of Evolutionary Biology, 22(8):1775-1780.

Abstract

Genetic variation for fitness-relevant traits may be maintained in natural populations by fitness differences that depend on environmental conditions.
For herbivores, plant quality and variation in chemical plant defences can maintain genetic variation in performance. Apart from plant secondary
compounds, symbiosis between plants and endosymbiotic fungi (endophytes) can produce herbivore-toxic compounds. We show that there is significant variation among aphid genotypes in response to endophytes by comparing life-history traits of 37 clones of the bird cherry-oat aphid Rhopalosiphum padi feeding on endophyte-free and endophyte-infected tall fescue Lolium arundinaceum.
Clonal variation for life-history traits was large, and most clones performed better on endophyte-free plants. However, the clones differed in
the relative performance across the two environments, resulting in significant
genotype · environment interactions for all reproductive traits. These findings suggest that natural variation in prevalence of endophyte infection can contribute to the maintenance of genetic diversity in aphid populations.

Genetic variation for fitness-relevant traits may be maintained in natural populations by fitness differences that depend on environmental conditions.
For herbivores, plant quality and variation in chemical plant defences can maintain genetic variation in performance. Apart from plant secondary
compounds, symbiosis between plants and endosymbiotic fungi (endophytes) can produce herbivore-toxic compounds. We show that there is significant variation among aphid genotypes in response to endophytes by comparing life-history traits of 37 clones of the bird cherry-oat aphid Rhopalosiphum padi feeding on endophyte-free and endophyte-infected tall fescue Lolium arundinaceum.
Clonal variation for life-history traits was large, and most clones performed better on endophyte-free plants. However, the clones differed in
the relative performance across the two environments, resulting in significant
genotype · environment interactions for all reproductive traits. These findings suggest that natural variation in prevalence of endophyte infection can contribute to the maintenance of genetic diversity in aphid populations.

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9 citations in Web of Science®
9 citations in Scopus®
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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Evolutionary Biology and Environmental Studies
Dewey Decimal Classification:570 Life sciences; biology
590 Animals (Zoology)
Uncontrolled Keywords:Endophytic fungi; genotype–environment interaction; herbivory; life history evolution; microbes; mutualism; Neotyphodium coenophialum; Plant–herbivore interaction; tall fescue; trade-offs
Language:English
Date:August 2009
Deposited On:24 Jul 2009 08:09
Last Modified:05 Apr 2016 13:18
Publisher:Wiley-Blackwell
ISSN:1010-061X
Additional Information:The definitive version is available at www.blackwell-synergy.com
Publisher DOI:10.1111/j.1420-9101.2009.01788.x
Permanent URL: http://doi.org/10.5167/uzh-19749

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