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Tomato spotted wilt orthotospovirus (TSWV) causes serious crop losses worldwide and is transmitted by  Frankliniella occidentalis  (Pergande) (Thysanoptera: Thripidae). NSs protein is the silencing suppressor of TSWV and plays an important role in virus infection, cycling, and transmission process. In this research, we investigated the influences of NSs protein on the interaction of TSWV, plants, and  F. occidentalis  with the transgenic  Arabidopsis thaliana . Compared with the wild-type Col-0 plant,  F. occidentalis  showed an increased number and induced feeding behavior on transgenic  Arabidopsis thaliana  expressing exogenous NSs. Further analysis showed that NSs reduced the expression of terpenoids synthesis-related genes and the content of monoterpene volatiles in  Arabidopsis . These monoterpene volatiles played a repellent role in respect to  F. occidentalis . In addition, the expression level of plant immune-related genes and the content of the plant resistance hormone jasmonic acid (JA) in transgenic  Arabidopsis  were reduced. The silencing suppressor of TSWV NSs alters the emission of plant volatiles and reduces the JA-regulated plant defenses, resulting in enhanced attractiveness of plants to  F. occidentalis  and may increase the transmission probability of TSWV.

frontiers in microbiology

NSs, the Silencing Suppressor of Tomato Spotted Wilt Orthotospovirus, Interferes With JA-Regulated Host Terpenoids Expression to Attract Frankliniella occidentalis