An increased risk of parasitism mediated by the facultative symbiont <em>Regiella insecticola</em>
- Others:
- Institut Sophia Agrobiotech (ISA) ; Université Nice Sophia Antipolis (1965 - 2019) (UNS) ; COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement (INRAE)-Université Côte d'Azur (UCA)
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection ; Northwest A and F University
- Northwest A&F Univ, Key Lab Integrated Pest Management Crops Northwes, State Key Lab Crop Stress Biol Arid Areas, Coll Plant Protect,Minist Agr, Yangling 712100, Shaanxi, Peoples R China ; Partenaires INRAE
- National Natural Science Foundation of China (31401735); Chinese Universities Scientific Fund (2452017060); China Postdoctoral Science Foundation funded project (2015T81057, 2014M560807); Postdoctoral Science Foundation of Shaanxi Province; China Scholarship Council (grant number: 201506300039)
- National Natural Science Foundation of China (31401735)
- Chinese Universities Scientific Fund (2452017060)
- China Postdoctoral Science Foundation funded project (2015T81057 2014M560807)
- the Postdoctoral Science Foundation of Shaanxi Province
- China Scholarship Council (grant number: 201506300039)
Description
Previous data showed that the parasitoid wasp Aphelinus asychis was more successful on Sitobion avenae clones artificially infected with different strains of Regiella insecticola compared to the same clones lacking facultative symbionts. To test whether this resulted from a specific interaction between the aphid and symbiont genotype, we used new clonal lines from a different genotype of S. avenae (Linyi) infected with the same R. insecticola strains. The parasitism rate of A. asychis was higher on the two Linyi lines infected with R. insecticola than on the uninfected control line, while the emergence rate was lower due to higher mortality during development. However, a different wasp species, Aphidius gifuensis, showed no difference in the parasitism rate and emergence rate between the three Linyi lines, suggesting that the increase in parasitism rate could be wasp species-dependent. The mortality of A. asychis during development in the presence of R. insecticola may be linked to (i) a direct toxic or metabolic effect since the weight of the emerged wasps was also reduced and (ii) a general effect on the aphid fitness since the survival and fecundity of infected aphids having survived A. asychis attack were clearly reduced compared to the control, while those surviving A. gifuensis attack had only a slight increase in their survival rate. Our data therefore enriched the panel of phenotypic effects that R. insecticola could contribute to the aphid and emphasized the potential implications of symbionts on biological pest control.
Abstract
National Natural Science Foundation of China(31401735), Chinese Universities Scientifc Fund (2452017060), theChina Postdoctoral Science Foundation funded project (2015T81057,2014M560807) and the Postdoctoral Science Foundation of ShaanxiProvince. In addition, C. Luo was supported by a grant from the ChinaScholarship Council (grant number: 201506300039) to study abroad.
Abstract
International audience
Additional details
- URL
- https://hal.inrae.fr/hal-02624742
- URN
- urn:oai:HAL:hal-02624742v1
- Origin repository
- UNICA