Host range and pathogenicity of tomato brown rugose fruit virus

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  • Tomato brown rugose fruit virusの宿主範囲および病原性

Abstract

<p>The tobamovirus tomato brown rugose fruit virus (ToBRFV) causes leaf mosaic and severe fruit symptoms such as browning and distortion (rugosity) on solanaceous crops. Since the first report of ToBRFV in Israel in 2014, it has been found in nearly 40 countries. To obtain further insights on its host range and pathogenicity, detection and preventing its invasion into Japan, we inoculated varieties of solanaceous crops and weeds in a glasshouse with the Israeli ToBRFV isolate and evaluated local and systemic symptoms and infection of the non-inoculated upper leaves. All the tomato varieties tested except for GCR237, homozygous for tobamovirus resistance gene Tm-1, were infected systemically and had mosaic symptoms on leaves. However, rugosity on fruits was very rarely observed on any varieties in our experimental conditions. Bell pepper varieties harboring L1, L2, L3, and L4 were resistant or immune to systemic infection. Two Japanese eggplant varieties were systemically infected, but they developed only temporary faint, chlorotic spots and wavy leaves. Most of the other solanaceous crops and weeds tested were also systemically infected by ToBRFV, including newly identified hosts Solanum sisysmbriifolium, S. muricatum, S. ptycunthum, S. nigrescens, and Nicandra physalodes. These results indicate that ToBRFV has a considerably wide host range especially in the Solanaceae.</p>

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