Journal
PEST MANAGEMENT SCIENCE
Volume 78, Issue 4, Pages 1529-1537Publisher
JOHN WILEY & SONS LTD
DOI: 10.1002/ps.6771
Keywords
host shift; partiti-like viruses; Spodoptera littoralis; fitness; transcriptome
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Funding
- Newton International Fellowship [NF161146]
- Global Challenges Research Fund grant [BB/P023444/1]
- Agricultural Science and Technology Innovation Program [CAAS-ZDRW202007, ASTIP-TRIC04]
- National Natural Science Foundation of China [31901893]
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The study found that the three partiti-like viruses were harmful to the new host, causing increased mortality. The viruses did not affect host fecundity or susceptibility to other pathogens. Transcriptome analysis indicated that the viruses could impact host gene-expression profiles.
BACKGROUND The general principle of using microbes from one species to manage a different pest species has a clear precedent in the large-scale release of mosquitoes carrying a Wolbachia bacterium derived from Drosophila flies. New technologies will facilitate the discovery of microbes that can be used in a similar way. Previously, we found three novel partiti-like viruses in the African armyworm (Spodoptera exempta). To investigate further the utility and consistency of host shift of insect viruses as a potential pest management tool, we tested the interaction between the partiti-like viruses and another novel host, the Egyptian cotton leafworm (Spodoptera littoralis). RESULT We found that all three partiti-like viruses appeared to be harmful to the novel host S. littoralis, by causing increased larval and pupal mortality. No effect was observed on host fecundity, and partiti-like virus infection did not impact host susceptibility when challenged with another pathogen, the baculovirus SpliNPV. Transcriptome analysis of partiti-like virus-infected and noninfected S. littoralis indicated that the viruses could impact host gene-expression profiles of S. littoralis, but they impact different pathways to the two other Spodoptera species through effects on pathways related to immunity (Jak-STAT/Toll and Imd) and reproduction (insulin signaling/insect hormones). CONCLUSION Taken together with the previous findings in the novel host S. frugiperda, these results indicate a parasitic relationship between the partiti-like viruses and novel insect hosts, suggesting a possible use and novel pest management strategy through the artificial host shift of novel viruses.
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