PLoS ONE (2021) 16 (3 - e0247500)

De-Fen Mou, Wei-Te Chen, Wei-Hua Li, Tsung-Chi Chen, Chien-Hao Tseng, Li-Hsin Huang, Jui-Chu Peng, Shyi-Dong Yeh and Chi-Wie Tsai (2021)
Transmission mode of watermelon silver mottle virus by Thrips palmi
PLoS ONE 16 (3 - e0247500)
Abstract: Thrips and thrips-transmitted tospoviruses cause significant losses in crop yields worldwide. The melon thrips (Thrips palmi) is not only a pest of cucurbit crops, but also a vector that transmits tospoviruses, such as the watermelon silver mottle virus (WSMoV). Vector transmission of tospoviruses has been well studied in the tomato spotted wilt virus (TSWV)–Frankliniella occidentalis model system; however, until now the transmission mode of WSMoV by T. palmi has not been sufficiently examined. The results of the transmission assays suggest that T. palmi transmits WSMoV in a persistent manner, and that the virus is mainly transmitted by adults, having been ingested at the first-instar larval stage. Complementary RNAs corresponding to the NSm and NSs genes of WSMoV were detected in viruliferous thrips by reverse transcription-polymerase chain reaction; NSs protein was also detected in viruliferous thrips by western blotting, verifying the replication of WSMoV in T. palmi. Furthermore, we demonstrated that in thrips infected with WSMoV at the first-instar larval stage, the virus eventually infected various tissues of the adult thrips, including the primary salivary glands. Taken together, these results suggest that T. palmi transmits WSMoV in a persistent-propagative mode. The results of this study make a significant contribution to the understanding of the transmission biology of tospoviruses in general.
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Database assignments for author(s): Li-Hsin Huang

Research topic(s) for pests/diseases/weeds:
transmission/dispersal of plant diseases

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Thrips palmi	Watermelon/colocynth (Citrullus)	Taiwan
	Orthotospovirus citrullomaculosi	Watermelon/colocynth (Citrullus)	Taiwan