Turnip vein-clearing virus (TVCV) and tobacco mosaic virus (TMV) represent subgroups of tobamoviruses infecting cruciferous and solanaceous plants, respectively. To identify adaptations that may have been necessary in the evolution of the TVCV subgroup from a TMV-like ancestor, the infection of turnip plants by TMV and by chimeras between TMV and TVCV was explored. TMV accumulated at spatially limited sites on inoculated turnip leaves as determined by leaf skeleton hybridization. A plasmid DNA containing a complete TVCV cDNA, when transcribed in vitro, produced RNA that was infectious to tobacco and turnip plants. TVCV-TMV chimeric genomes with junctions within coding regions were not infectious to tobacco, though the movement protein (MP) chimera was infectious to tobacco with a TMV MP transgene. Reciprocal chimeras with junctions between genes were infectious to tobacco. TVCV with a TMV MP gene infected turnips. The other tested chimeras were not detected in non-inoculated leaves, but were found in the inoculated leaves. Thus, the TMV MP is not responsible for the limitation of TMV spread in turnips.
Archives of Virology – Springer Journals
Published: May 1, 1999
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