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J Gen Virol 84 (2003), 1367-1375; DOI 10.1099/vir.0.19020-0

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© 2003 Society for General Microbiology

Use of Spring beauty latent virus to identify compatible interactions between bromovirus components required for virus infection

Koki Fujisaki, Masanori Kaido, Kazuyuki Mise and Tetsuro Okuno

Laboratory of Plant Pathology, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan

Correspondence
Kazuyuki Mise
kmise{at}kais.kyoto-u.ac.jp

Spring beauty latent virus (SBLV) is a member of the genus Bromovirus, and is closely related to Brome mosaic virus (BMV) and Cowpea chlorotic mottle virus (CCMV). Compatible interactions between viral components are required for successful infection of plants by BMV and CCMV. To further our understanding of interactions between bromovirus components, we used SBLV to produce reassortants among the three bromoviruses. We found that SBLV RNA 2 functioned with heterologous bromovirus RNA 1 in infections of whole plants and protoplasts of Nicotiana benthamiana, although SBLV RNA 1 did not function with heterologous bromovirus RNA 2. A DNA-based transient assay for 1a and 2a proteins, which are encoded by RNAs 1 and 2, respectively further suggested that SBLV 2a protein may function in combination with heterologous bromovirus 1a protein. Moreover, analysis of the ability of reassortants to spread locally revealed that an RNA 2-mediated interaction between viral components may be required for efficient cell-to-cell movement of bromoviruses.






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