Comparison of life-history traits and resistance for Sitobion avenae (Fabricius) harboring a facultative symbiont

Luo, Chen; Monticelli, Lucie S.; Li, Dandan; Ahmed, Syed Suhail; Pandharikar, Gaurav; Zhao, Hongwei; Desneux, Nicolas; Hu, Zhengqiang

doi:10.1127/entomologia/2019/0823

Cited by 17 publications

(14 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Studies have found that R. insecticola did not affect the aphid survival rate, even if two different strains were tested (Luo et al, 2020b). The same results were found in our study.…”

Section: Discussionsupporting

confidence: 91%

Secondary symbionts affect aphid fitness and the titer of primary symbiont

Liu

Liu²,

Zhang³

et al. 2023

Front. Plant Sci.

View full text Add to dashboard Cite

Bacterial symbionts associated with aphids are important for their ecological fitness. The corn leaf aphid, Rhopalosiphum maidis (Fitch), is one of the most damaging aphid pests on maize and has been reported to harbor Hamiltonella defensa and Regiella insecticola while the effects of the secondary symbionts (S-symbionts) on host ecology and primary symbiont Buchnera aphidicola remain unclear. Here, four aphid strains were established, two of which were collected from Langfang - Hebei Province, China, with similar symbiont pattern except for the presence of H. defensa. Two other aphid strains were collected from Nanning - Guangxi Province, China, with the same symbiont infection except for the presence of R. insecticola. Phylogenetic analysis and aphid genotyping indicated that the S-symbiont-infected and free aphid strains from the same location had identical genetic backgrounds. Aphid fitness measurement showed that aphid strain infected with H. defensa performed shortened developmental duration for 1st instar and total nymph stages, reduced aphid survival rate, offspring, and longevity. While the developmental duration of H-infected strains was accelerated, and the adult weight was significantly higher compared to the H-free strain. Infection with R. insecticola did not affect the aphid’s entire nymph stage duration and survival rate. As the H-strain does, aphids infected with R. insecticola also underwent a drop in offspring, along with marginally lower longevity. Unlike the H-infected strain, the R-infected strain performed delayed developmental duration and lower adult weight. The B. aphidicola titers of the H-infected strains showed a steep drop during the aphid 1st to 3rd instar stages, while the augmentation of B. aphidicola titers was found in the R-infected strain during the aphid 1st to 3rd instar. Our study investigated for the first time the effect of the S-symbionts on the ecology fitness and primary symbiont in R. maidis, indicating that infection with secondary symbionts leads to the modulation of aphid primary symbiont abundance, together inducing significant fitness costs on aphids with further impact on environmental adaptation and trophic interactions.

show abstract

“…Studies have found that R. insecticola did not affect the aphid survival rate, even if two different strains were tested (Luo et al, 2020b). The same results were found in our study.…”

Section: Discussionsupporting

confidence: 91%

Secondary symbionts affect aphid fitness and the titer of primary symbiont

Liu

Liu²,

Zhang³

et al. 2023

Front. Plant Sci.

View full text Add to dashboard Cite

show abstract

“…Previous work, predominantly on other aphid species, has shown that parasitoid resistance can be conferred by all the symbionts we identified (reviewed by Guo et al 2017). In Sitobion avenae aphids experimental work with endosymbionts has shown R. insecticola to reduce parasitoid emergence rates (Luo et al 2020) while infection with H. defensa had no protective effect (Lukasik et al 2013;Zepeda-Paulo, Villegas & Lavandero 2017;Li et al 2018). Effects of the other endosymbionts has not been empirically tested in S. avenae sufficiently to make conclusions, but our results suggest that examining variation between Serratia symbiotic and R. insecticola would be an informed starting point.…”

Section: Discussionmentioning

confidence: 87%

Floral presence and flower identity alter cereal aphid endosymbiont communities on adjacent crops

Zytynska

Sturm

Hawes

et al. 2023

Preprint

View full text Add to dashboard Cite

1. Floral plantings adjacent to crops fields can recruit populations of natural enemies by providing flower nectar and non-crop prey to increase natural pest regulation. Observed variation in success rates might be due to changes in the unseen community of protective endosymbionts hosted by many herbivorous insects, which can confer resistance to various specialist natural enemies, e.g. parasitoid wasps. Reduced insect control may occur if highly protective symbiont combinations increase in frequency via selection effects, and this is expected to be stronger in lower diversity systems. 2. We used a large-scale field trial to analyse the bacterial endosymbiont communities hosted by cereal aphids (Sitobion avenae) collected along transects into strip plots of barley plants managed by either conventional or integrated (including floral field margins and reduced inputs) methods. In addition, we conducted an outdoor pot experiment to analyse endosymbionts in S. avenae aphids collected on barley plants that were either grown alone or alongside one of three flowering plants, across three time points. 3. In the field, aphids hosted up to four symbionts. The abundance of aphids and parasitoid wasps was reduced towards the middle of all fields while aphid symbiont species richness and diversity decreased into the field in conventional, but not integrated, field-strips. The proportion of aphids hosting different symbiont combinations varied across cropping systems, with distances into the fields, and were correlated with parasitoid wasp abundances. 4. In the pot experiment, aphids hosted up to six symbionts. Flower presence increased natural enemy abundance and diversity, and decreased aphid abundance. The proportion of aphids hosting different symbiont combinations varied across the flower treatment and time, and were correlated with varying abundances of the different specialist parasitoid wasp species recruited by different flowers. 5. Synthesis and applications. Floral plantings and flower identity can have community-wide impacts on the combinations of bacterial endosymbionts hosted by herbivorous insects. Our work highlights the potential of within-season selection for symbiont-mediated pest resistance to natural enemies with biological control impacts. This could be mitigated through increased recruitment of diverse natural enemies by incorporating functional diversity of floral resources into the environment.

show abstract

“…Several mechanistic explanations can be proposed to account for the trait-specific conclusions about the interactive effects of temperature and symbiotic infection on host fitness. First, variability could arise from energetic trade-offs shaping resource allocation between traits (e.g., defense and fecundity), particularly under physiologically constraining conditions such as infection by facultative symbionts and stress-inducing temperatures (15,49). Second, life-history traits frequently differ in their thermal requirement and response to warming (50,51).…”

Section: Discussionmentioning

confidence: 99%

Impact of heat stress on the fitness outcomes of symbiotic infection in aphids: a meta-analysis

Tougeron¹,

Iltis²

2021

Preprint

View full text Add to dashboard Cite

Beneficial microorganisms shape the evolutionary trajectories of their hosts, facilitating or constraining the colonization of new ecological niches. One convincing example entails the responses of insect-microbe associations to rising temperatures. Indeed, the insect resilience to stressful high temperatures depends on the genetic identity of the obligate symbiont and the presence of heat protective facultative symbionts. With accumulating empirical evidence, there is a need of integrative studies to draw general patterns about the thermal sensitivity of insect-microbe associations, from an eco-evolutionary perspective. Focusing on aphid-bacteria mutualisms, this meta-analysis aims to quantify the context-dependent impacts of symbionts on host phenotype in benign or stressful heat conditions, across fitness traits, types of heat stress, and symbiont species. We found that warming lowered the benefits (parasitoid resistance) and costs (development, fecundity) of infection by facultative symbionts, which was overall mostly beneficial to the aphids under short-term heat stress (heat shock) rather than extended warming. Heat tolerant genotypes of the obligate symbiont Buchnera aphidicola and some facultative symbionts (Rickettsia sp., Serratia symbiotica) improved or maintained aphid fitness under heat stress. As phytophagous insects are central to terrestrial ecosystems, symbiont-mediated responses to increasing mean temperatures and frequency of heat waves in the context of climate change are key elements that may have cascading effects on food webs and there is an urgent need to continue accumulating data on other models. We discuss the implications of these conclusions for the general understanding of the cost-benefits balance and eco-evolutionary dynamics of insect-microbe associations faced with climate change.

show abstract

Comparison of life-history traits and resistance for Sitobion avenae (Fabricius) harboring a facultative symbiont

Cited by 17 publications

References 1 publication

Secondary symbionts affect aphid fitness and the titer of primary symbiont

Secondary symbionts affect aphid fitness and the titer of primary symbiont

Floral presence and flower identity alter cereal aphid endosymbiont communities on adjacent crops

Impact of heat stress on the fitness outcomes of symbiotic infection in aphids: a meta-analysis

Contact Info

Product

Resources

About