Abstract
Tobacco mosaic virus (TMV) produces large quantities of RNA and protein on infection of plant cells. This and other features, attributable to its autonomous replication, make TMV an attractive candidate for expression of foreign sequences in plants. However, previous attempts to construct expression vectors based on plant RNA viruses, such as TMV, have been unsuccessful in obtaining systemic and stable movement of foreign genes to uninoculated leaves in whole plants. A hybrid viral RNA (TB2) was constructed, containing sequences from two tobamoviruses (TMV-U1 and odontoglossum ringspot virus). Two bacterial sequences inserted independently into TB2 moved systemically in Nicotiana benthamiana, although they differed in their stability on serial passage. Systemic expression of the bacterial protein neomycin phosphotransferase was demonstrated. Hybrid RNAs containing both TMV-U1 and the inserted bacterial gene sequences were encapsidated by the odontoglossum ringspot virus coat protein, facilitating their transmission and amplification on passaging to subsequent plants. The vector TB2 provides a rapid means of expressing genes and gene variants in plants.
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