ArticleArchives of virology2026
Emergence and molecular characterization of a resistance-breaking tomato spotted wilt virus isolate on bell pepper plants harboring the Tsw resistance gene in Japan.
Article in Archives of virology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Tomato spotted wilt virus (TSWV) is distributed all over Japan and globally, seriously damaging infected plants. A resistance-conferring gene, Tsw, that controls the yellow spotted wilt disease in bell pepper (Capsicum annuum) plants caused by TSWV infection in Japan, is now commercially available. In this study, we isolated for the first time in Japan, a resistance-breaking isolate, TSWV-JRB, from bell pepper plants harboring Tsw. The virus overcame the resistance conferred by Tsw in its heterozygous and homozygous configurations. The host range or virulence of TSWV-JRB and one of the non-resistance breaking isolates from Japan did not differ, except in the plants harboring Tsw. The TSWV-JRB acquisition rates and transmission rates of the thrip pests Frankliniella occidentalis and F. intonsa were 93% 38%, and 78% and 38%, respectively. A phylogenetic analysis of the N gene sequences indicated a distant relationship between TSWV-JRB and other Japanese isolates but a close association with Asian and European isolates. A comparison of the amino acid sequences encoded by these resistance-breaking and non-resistance-breaking NSs suggested that a residue 74 (S→P) is a putative resistance breaking-associated substitution. This is the first study to report Tsw-induced resistance breaking by TSWV in Japan. These results indicated the presence of a novel substitution in TSWV that might contribute to Tsw-resistance breaking.
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