Wolbachia impairs post-eclosion host preference in a parasitoid wasp

Abrun, Pouria; Ashouri, Ahmad; Duplouy, Anne; Farahani, Hossein Kishani

doi:10.1007/s00114-021-01727-z

Cited by 7 publications

(10 citation statements)

References 89 publications

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“…45,60,61 Memory loss may cause a breakdown in the mechanism of host discrimination, and induce Wolbachia-infected wasps to display a high tendency of superparasitism. [56][57][58]62 Our results showed a higher proportion of superparasitism for both W and B females at 16 h than at 32 h. Generally, the decision by parasitoid females relies on different cues produced by hosts and conspecific individuals. 63 The increase in superparasitism by wasps over time is dependent upon the state of the hosts.…”

Section: Discussionmentioning

confidence: 92%

“…For example, memory duration is significantly shorter in Wolbachiainfected T. brassicae than in their uninfected counterparts. [56][57][58] Reduced memory induced by Wolbachia infection is also found in Armadillidium vulgare. 59 Previous studies have shown that learning host-associated cues during oviposition enables wasps to discriminate and reject parasitised hosts.…”

Section: Discussionmentioning

confidence: 99%

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Wolbachia‐infected Trichogramma dendrolimi is outcompeted by its uninfected counterpart in superparasitism but does not have developmental delay

Zhou

Dan

Liu

et al. 2022

Pest Management Science

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BACKGROUND: Wolbachia infection increases the superparasitism frequency of Trichogramma females and provides an opportunity for horizontal intraspecific transmission. However, superparasitism may lead to interstrain competition between Wolbachia-infected Trichogramma offspring and their uninfected counterparts. This study investigated the outcome of interstrain intrinsic competition between Wolbachia-infected thelytokous strain (W) and uninfected bisexual strain (B) of Trichogramma dendrolimi. To determine the developmental rate of both strains, the sizes of immature stages of T. dendrolimi offspring at different times after parasitisation were measured in single parasitism and superparasitism conditions. RESULTS:The results reflect increased superparasitism by Wolbachia-infected females compared with uninfected females. Trichogramma females did not discriminate between host eggs previously parasitised by either B or W females. When the first oviposition was performed by B females, the B offspring outcompeted W offspring deposited later. Although when W offspring was deposited 8 h earlier than the B offspring, it gained no advantage over B offspring. Regardless of parasitism conditions, differences in the development rate between W and B offspring were not significant. CONCLUSION:The results reconfirmed that W females presented a higher tendency for superparasitism than B females, and showed that B offspring outcompeted W offspring even when the latter was deposited 8 h earlier. The inferiority of Wolbachia-infected Trichogramma compared with their uninfected counterparts is not due to the developmental delay. This study provides insights into the effects of intrinsic competition on the control efficacy of Wolbachia-infected Trichogramma against pests in biological control programs.

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Section: Discussionmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Wolbachia‐infected Trichogramma dendrolimi is outcompeted by its uninfected counterpart in superparasitism but does not have developmental delay

Zhou

Dan

Liu

et al. 2022

Pest Management Science

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“…Some studies showed that the memory retention of Trichogramma wasps is induced by Wolbachia infection. For example, the memory duration is signi cantly longer in Wolbachia-infected T. brassicae than in their uninfected counterparts (Farahani et al 2017(Farahani et al , 2021Abrun et al 2021). Owing to the memory loss of Wolbachia-infected Trichogramma wasps, the wasps are expected to forget cues related to HMP and lose the ability to distinguish healthily and parasitized hosts (Ueno and Tanaka, 1996;Farahani et al 2017).…”

Section: Discussionmentioning

confidence: 99%

“…The superparasitism in Trichogramma wasps is expected to be more frequent in the augmentative biological control programs when the inundative number of Trichogramma wasps is released in elds, and in the mass-rearing procedure of Trichogramma production when the host eggs are supplied in excess compared to the number of wasps (Wang et Interestingly, previous studies indicated that Wolbachia infection in Trichogramma females induced memory loss (Farahani et al 2017; and declined host discrimination (Pan et al 2007; Abrun et al 2021; Zhang et al 2021) of infected females compared to their uninfected counterparts. In T. brassicae (Farahani et al 2015) and T. dendrolimi (Liu et al 2018), Wolbachia-infected females presented a higher probability of superparasitism than uninfected females.…”

Section: Introductionmentioning

confidence: 99%

Effects of Wolbachia Infection, Parasitic Order, And Time Interval On The Outcome of Inter-Strain Intrinsic Competition Between Bisexual Strain And Wolbachia-Induced Thelytokous Strain of Egg Parasitoid, Trichogramma Dendrolimi

Zhou

Dan

Liu

et al. 2022

Preprint

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Parasitoids may deposit a second clutch of eggs on a host that has been parasitized by the same parasitoid species. This is termed “superparasitism”. Wolbachia infection increases the superparasitism frequency of Trichogramma females. We investigated the outcome and fitness cost of inter-strain intrinsic competition between Wolbachia-infected thelytokous strain (TDW) and uninfected bisexual strain (TDB) of Trichogramma dendrolimi. To determine the developmental rate of both strains, the size of immature stages of T. dendrolimi offspring at different times after parasitization was measured in single parasitism and superparasitism conditions. The results showed increased superparasitism by Wolbachia-infected females compared to uninfected females, regardless of the time interval between oviposition; Trichogramma females were unable to distinguish between host eggs previously parasitized by TDB or TDW females. When the first oviposition was performed by TDB females, the TDB offspring outcompeted TDW offspring deposited later. However, although the TDW offspring was deposited 8 h earlier than the TDB offspring, it gained no advantage over TDB offspring. Regardless of parasitism conditions, the differences in development rate and time between TDW and TDB offspring were not significant. This study revealed that albeit TDW females presented a higher tendency of superparasitism than TDB females, TDB offspring outcompeted TDW offspring even when the latter was deposited 8 h earlier. The negative effects of Wolbachia infection on the competitive ability of TDW offspring inside the host eggs were due to offspring’s low fitness rather than delayed development.

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“…Some Wolbachia strains have also been shown to provide nutrients essential to the survival of their hosts [ 19 ], to protect against natural enemies [ 20 – 22 ], or to influence their host behaviours in ways that enhance fitness (e.g. mating rate [ 23 ], lekking [ 24 ], host choice [ 25 ], and more—see review [ 26 ]). These phenotypes have been selected as they improve the fitness of infected hosts over their uninfected counterparts, and therefore provide efficient means for the spread of the symbiont through generations, which can affect the inheritance pattern of the host DNA [ 27 ].…”

Section: Introductionmentioning

confidence: 99%

Wolbachia-driven selective sweep in a range expanding insect species

et al. 2021

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Background Evolutionary processes can cause strong spatial genetic signatures, such as local loss of genetic diversity, or conflicting histories from mitochondrial versus nuclear markers. Investigating these genetic patterns is important, as they may reveal obscured processes and players. The maternally inherited bacterium Wolbachia is among the most widespread symbionts in insects. Wolbachia typically spreads within host species by conferring direct fitness benefits, and/or by manipulating its host reproduction to favour infected over uninfected females. Under sufficient selective advantage, the mitochondrial haplotype associated with the favoured maternally-inherited symbiotic strains will spread (i.e. hitchhike), resulting in low mitochondrial genetic variation across the host species range. Method The common bluetail damselfly (Ischnura elegans: van der Linden, 1820) has recently emerged as a model organism for genetics and genomic signatures of range expansion during climate change. Although there is accumulating data on the consequences of such expansion on the genetics of I. elegans, no study has screened for Wolbachia in the damselfly genus Ischnura. Here, we present the biogeographic variation in Wolbachia prevalence and penetrance across Europe and Japan (including samples from 17 populations), and from close relatives in the Mediterranean area (i.e. I. genei: Rambur, 1842; and I. saharensis: Aguesse, 1958). Results Our data reveal (a) multiple Wolbachia-strains, (b) potential transfer of the symbiont through hybridization, (c) higher infection rates at higher latitudes, and (d) reduced mitochondrial diversity in the north-west populations, indicative of hitchhiking associated with the selective sweep of the most common strain. We found low mitochondrial haplotype diversity in the Wolbachia-infected north-western European populations (Sweden, Scotland, the Netherlands, Belgium, France and Italy) of I. elegans, and, conversely, higher mitochondrial diversity in populations with low penetrance of Wolbachia (Ukraine, Greece, Montenegro and Cyprus). The timing of the selective sweep associated with infected lineages was estimated between 20,000 and 44,000 years before present, which is consistent with the end of the last glacial period about 20,000 years. Conclusions Our findings provide an example of how endosymbiont infections can shape spatial variation in their host evolutionary genetics during postglacial expansion. These results also challenge population genetic studies that do not consider the prevalence of symbionts in many insects, which we show can impact geographic patterns of mitochondrial genetic diversity.

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Wolbachia impairs post-eclosion host preference in a parasitoid wasp

Cited by 7 publications

References 89 publications

Wolbachia‐infected Trichogramma dendrolimi is outcompeted by its uninfected counterpart in superparasitism but does not have developmental delay

Wolbachia‐infected Trichogramma dendrolimi is outcompeted by its uninfected counterpart in superparasitism but does not have developmental delay

Effects of Wolbachia Infection, Parasitic Order, And Time Interval On The Outcome of Inter-Strain Intrinsic Competition Between Bisexual Strain And Wolbachia-Induced Thelytokous Strain of Egg Parasitoid, Trichogramma Dendrolimi

Wolbachia-driven selective sweep in a range expanding insect species

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