Hungary: New type of resistance breaking strain of tomato spotted wilt virus (TSWV)

Published 2023년 3월 3일

Tridge summary

Researchers in Hungary have identified a new strain of tomato spotted wilt virus (TSWV) that breaks the Sw-5b resistance gene commonly used in tomato breeding. This strain has a unique mutation in the NSm protein, marking the first time this mutation has been linked to the resistance-breaking phenotype. The origin of the strain is unknown, raising concerns about its spread. The findings were published in the European Journal of Plant Pathology and highlight the need to monitor the new strain to develop effective countermeasures.

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Original content

Researchers from Plant Protection Institute (Centre for Agricultural Research, Eötvös Loránd Research Network, in Budapest, Hungary) and Univer Product Plc. (Kecskemét, Hungary) isolated and identified a new type of resistance breaking strain of tomato spotted wilt virus (TSWV) in Hungary. The results were published in the European Journal of Plant Pathology in February. Sw-5b is a widely used resistance gene in tomato breeding to control tomato spotted wilt virus (TSWV). The NSm protein encoded by TSWV is identified as the avirulence (AVR) determinant in Sw-5b-mediated resistance. In the last decades, Sw-5b resistance breaking (RB) isolates were found and identified in many locations around the world. The resistance-breaking phenotype in all the previously verified TSWV Sw-5b RB strains is associated with the NSmC118Y or NSmT120N mutations. In the summer of 2022, an Sw-5b RB TSWV strain was recognized in a greenhouse in Hungary. In inoculation experiments, this strain was able ...

Source: Tomatonews