The 1b gene of raspberry bushy dwarf virus is a virulence component that facilitates systemic virus infection in plants.

Virology

Plant Pathology Laboratory, Faculty of Agriculture, Iwate University, Ueda 3-chome 18-8, Morioka 020-8550, Iwate, Japan.

Published: January 2019

A product translated from the 1b gene of raspberry bushy dwarf virus (RBDV) was specifically detected in RBDV-infected Nicotiana benthamiana plants by immunoblot analysis. To analyze the effects of the 1b gene on virus infection in host plants, an RBDV deletion mutant virus (RB∆1bstop), which is unable to express the 1b gene, was constructed and inoculated to N. benthamiana plants. The results showed that accumulation of the virus genomic (g) RNAs 1 and 2 decreased in inoculated leaves, and that systemic virus spread was delayed compared with wild-type RBDV. In contrast, accumulation of the viral gRNAs 1 and 2 was elevated in RB∆1bstop-infected leaf tissues during ectopic expression of the 1b gene. Furthermore, we found that the 1b has weak RNA silencing suppressor activity.

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http://dx.doi.org/10.1016/j.virol.2018.10.025DOI Listing

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