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Effects of pea aphid secondary endosymbionts on aphid resistance and development of the aphid parasitoid Aphidius ervi: a correlative study

Nyabuga, Franklin LU ; Outreman, Yannick; Simon, Jean-Christophe; Heckel, David G and Weisser, Wolfgang W (2010) In Entomologia Experimentalis et Applicata 136. p.243-253
Abstract
In order to reduce parasite-induced mortality, hosts may be involved in mutualistic interactions in

which the partner contributes to resistance against the parasite. The pea aphid, Acyrthosiphon pisum

Harris (Hemiptera: Aphididae), harbours secondary bacterial endosymbionts, some of which have

been reported to confer resistance against aphid parasitoids. Although this resistance often results in

death of the developing parasitoid larvae, some parasitoid individuals succeed in developing into

adults. Whether these individuals suffer from fitness reduction compared to parasitoids developing

in pea aphid clones without symbionts has not been tested so far. Using 30 pea aphid clones that... (More)
In order to reduce parasite-induced mortality, hosts may be involved in mutualistic interactions in

which the partner contributes to resistance against the parasite. The pea aphid, Acyrthosiphon pisum

Harris (Hemiptera: Aphididae), harbours secondary bacterial endosymbionts, some of which have

been reported to confer resistance against aphid parasitoids. Although this resistance often results in

death of the developing parasitoid larvae, some parasitoid individuals succeed in developing into

adults. Whether these individuals suffer from fitness reduction compared to parasitoids developing

in pea aphid clones without symbionts has not been tested so far. Using 30 pea aphid clones that differed

in their endosymbiont complement, we studied the effects of these endosymbionts on aphid

resistance against the parasitoid Aphidius ervi Haliday (Hymenoptera: Braconidae: Aphidiinae),

host–parasitoid physiological interactions, and fitness of emerging adult parasitoids. The number of

symbiont species in an aphid clone was positively correlated with a number of resistance measurements

but there were also clear symbiont-specific effects on the host–parasitoid interaction. As in

previous studies, pea aphid clones infected with Hamiltonella defensa Moran et al. showed resistance

against the parasitoid. In addition, pea aphid clones infected with Regiella insecticolaMoran et al. and

co-infections of H. defensa–Spiroplasma, R. insecticola–Spiroplasma, and R. insecticola–H. defensa

showed reduced levels of parasitism and mummification. Parasitoids emerging from symbiontinfected

aphid clones often had a longer developmental time and reduced mass. The number of

teratocytes was generally lower when parasitoids oviposited in aphid clones with a symbiont complement.

Interestingly, unparasitized aphids infected with Serratia symbiotica Moran et al. and

R. insecticola had a higher fecundity than unparasitized aphids of uninfected pea aphid clones. We

conclude that in addition to conferring resistance, pea aphid symbionts also negatively affect parasitoids

that successfully hatch from aphid mummies. Because of the link between aphid resistance

and the number of teratocytes, the mechanism underlying resistance by symbiont infection may

involve interference with teratocyte development. (Less)
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Contribution to journal
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published
subject
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Entomologia Experimentalis et Applicata
volume
136
pages
243 - 253
publisher
Kluwer
external identifiers
  • scopus:77955247669
ISSN
1570-7458
DOI
10.1111/j.1570-7458.2010.01021.x
language
English
LU publication?
no
id
5943befd-4110-496a-887e-8fc57dbafd6f (old id 3954499)
date added to LUP
2013-07-23 16:37:33
date last changed
2017-06-11 05:03:16
@article{5943befd-4110-496a-887e-8fc57dbafd6f,
  abstract     = {In order to reduce parasite-induced mortality, hosts may be involved in mutualistic interactions in<br/><br>
which the partner contributes to resistance against the parasite. The pea aphid, Acyrthosiphon pisum<br/><br>
Harris (Hemiptera: Aphididae), harbours secondary bacterial endosymbionts, some of which have<br/><br>
been reported to confer resistance against aphid parasitoids. Although this resistance often results in<br/><br>
death of the developing parasitoid larvae, some parasitoid individuals succeed in developing into<br/><br>
adults. Whether these individuals suffer from fitness reduction compared to parasitoids developing<br/><br>
in pea aphid clones without symbionts has not been tested so far. Using 30 pea aphid clones that differed<br/><br>
in their endosymbiont complement, we studied the effects of these endosymbionts on aphid<br/><br>
resistance against the parasitoid Aphidius ervi Haliday (Hymenoptera: Braconidae: Aphidiinae),<br/><br>
host–parasitoid physiological interactions, and fitness of emerging adult parasitoids. The number of<br/><br>
symbiont species in an aphid clone was positively correlated with a number of resistance measurements<br/><br>
but there were also clear symbiont-specific effects on the host–parasitoid interaction. As in<br/><br>
previous studies, pea aphid clones infected with Hamiltonella defensa Moran et al. showed resistance<br/><br>
against the parasitoid. In addition, pea aphid clones infected with Regiella insecticolaMoran et al. and<br/><br>
co-infections of H. defensa–Spiroplasma, R. insecticola–Spiroplasma, and R. insecticola–H. defensa<br/><br>
showed reduced levels of parasitism and mummification. Parasitoids emerging from symbiontinfected<br/><br>
aphid clones often had a longer developmental time and reduced mass. The number of<br/><br>
teratocytes was generally lower when parasitoids oviposited in aphid clones with a symbiont complement.<br/><br>
Interestingly, unparasitized aphids infected with Serratia symbiotica Moran et al. and<br/><br>
R. insecticola had a higher fecundity than unparasitized aphids of uninfected pea aphid clones. We<br/><br>
conclude that in addition to conferring resistance, pea aphid symbionts also negatively affect parasitoids<br/><br>
that successfully hatch from aphid mummies. Because of the link between aphid resistance<br/><br>
and the number of teratocytes, the mechanism underlying resistance by symbiont infection may<br/><br>
involve interference with teratocyte development.},
  author       = {Nyabuga, Franklin and Outreman, Yannick and Simon, Jean-Christophe and Heckel, David G and Weisser, Wolfgang W},
  issn         = {1570-7458},
  language     = {eng},
  pages        = {243--253},
  publisher    = {Kluwer},
  series       = {Entomologia Experimentalis et Applicata},
  title        = {Effects of pea aphid secondary endosymbionts on aphid resistance and development of the aphid parasitoid <i>Aphidius ervi</i>: a correlative study},
  url          = {http://dx.doi.org/10.1111/j.1570-7458.2010.01021.x},
  volume       = {136},
  year         = {2010},
}