BACKGROUND: Tomato spotted wilt orthotospovirus (TSWV), one of the most devastating viruses of ornamental plants and vegetable crops worldwide, is transmitted by the western flower thrips, Frankliniella occidentalis (Pergande), in a persistent-propagative manner. How TSWV influences the reproduction of its vector to enhance transmission and whether infection with TSWV changes the mating behavior of F. occidentalis are not fully understood. RESULTS: TSWV-exposed thrips had a significantly longer developmental time than non-exposed individuals. More importantly, increased developmental time was predominantly associated with adults, a stage critical for dispersal and virus transmission. In addition, TSWV-exposed F. occidentalis produced substantially more progeny than did non-exposed thrips. Interestingly, most of the increase in progeny came from an increase in males, a sex with a greater dispersal and virus transmission capability. Specifically, the female/male ratio of progeny shifted from 1.3–7.0/1 to 0.6–1.1/1. As for mating behavior, copulation time was significantly longer in TSWV-exposed thrips. Finally, females tended to re-mate less when exposed to the virus. Resistance to re-mating may lead to reduced sperm availability in females, which translates to a larger number of male progeny under a haplodiploid system. CONCLUSION: These combined results suggest that TSWV can influence the developmental time, mating behavior, fecundity, and offspring sex allocation of its vector F. occidentalis to facilitate virus transmission. As such, a monitoring program capable of the earlier detection of the virus in host plants and/or its insect vector, thrips, using double-antibody sandwich enzyme-linked immunosorbent assay (DAS-ELISA), real time quantitative polymerase chain reaction (RT-qPCR) or virus detection strips might be beneficial for long-term, sustainable management.
|Number of pages||9|
|Journal||Pest Management Science|
|State||Published - Jul 1 2020|
Bibliographical noteFunding Information:
This study was funded by the National Key R&D Program of China (2017YFD0201000), the Natural Science Foundation of China (31772199, 31572037), the Science and Technology Innovation Program of the CAAS (AAS-ASTIP-IVFCAAS), the Beijing Leafy Vegetables Innovation Team of the Modern Agro-industry Technology Research System (BAIC07-2018), and the Beijing Key Laboratory for Pest Control and Sustainable Cultivation of Vegetables.
© 2020 Society of Chemical Industry
- Frankliniella occidentalis
- mating behavior
- sex ratio allocation
- tomato spotted wilt orthotospovirus
ASJC Scopus subject areas
- Agronomy and Crop Science
- Insect Science