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Sugar beet cultivation is dependent on an effective control of beet necrotic yellow vein virus (BNYVV, family  Benyviridae ), which causes tremendous economic losses in sugar production. As the virus is transmitted by a soilborne protist, the use of resistant cultivars is currently the only way to control the disease. The  Rz2  gene product belongs to a family of proteins conferring resistance towards diverse pathogens in plants. These proteins contain coiled‐coil and leucine‐rich repeat domains. After artificial inoculation of homozygous  Rz2  resistant sugar beet lines, BNYVV and beet soilborne mosaic virus (BSBMV, family  Benyviridae ) were not detected. Analysis of the expression of  Rz2  in naturally infected plants indicated constitutive expression in the root system. In a transient assay, coexpression of  Rz2  and the individual BNYVV‐encoded proteins revealed that only the combination of  Rz2  and triple gene block protein 1 (TGB1) resulted in a hypersensitive reaction (HR)‐like response. Furthermore, HR was also triggered by the TGB1 homologues from BSBMV as well as from the more distantly related beet soilborne virus (family  Virgaviridae ). This is the first report of an  R  gene providing resistance across different plant virus families.

molecular plant pathology

The  Beta vulgaris ‐derived resistance gene  Rz2  confers broad‐spectrum resistance against soilborne sugar beet‐infecting viruses from different families by recognizing triple gene block protein 1