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Transformed Arabidopsis plants were used to study the effect of the cauliflower mosaic virus (CaMV) inclusion body protein on translation of dicistronic RNA. Reporter plants contain a dicistronic transcription unit with CaMV open reading frame VII (ORF VII) as the first and the [beta]-glucuronidase (GUS) reporter ORF as the second cistron. "Transactivator plants" contain CaMV ORF VI under the control of the strong CaMV 35S promoter. The transactivator plants were difficult to regenerate and showed an abnormal phenotype. Expression of GUS activity in the reporter plants was very low, but high GUS activity could be induced by introduction of gene VI, either by crossing with plants containing gene VI as a transgene or by infection with CaMV. Histological GUS assays showed that transactivation occurred in all types of tissue and at all developmental stages. The practical implications of the induction of GUS expression from the dicistronic unit by virus infection are discussed.

Cauliflower Mosaic Virus Gene VI Controls Translation from Dicistronic Expression Units in Transgenic Arabidopsis Plants.