First report of viruses infecting Vigna marina and Vigna riukiuensis in Japan

Mosaic, chlorosis, brown spots, or roughness were found on Vigna marina and V. riukiuensis , which are salt-resistant wild relatives of cowpea ( V. unguiculata ) and adzuki bean ( V. angularis ), respectively, on Miyako Island, Japan. RNA-sequencing was performed to identify both cucumber mosaic virus (CMV) and bean common mosaic virus (BCMV) in the leaves of both Vigna species. CMV from leaves of V. marina and BCMV from V. riukiuensis systemically infected Vigna plants and caused symptoms on leaves. Thus, these viruses are responsible for the symptoms. This is the first report of CMV and BCMV infecting wild species of Vigna in Japan.