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J. Virol., 05 1997, 3597-3602, Vol 71, No. 5
K Salanki, I Carrere, M Jacquemond, E Balazs and M Tepfer
Cucumber mosaic virus (CMV) and tomato aspermy virus (TAV) are closely
related cucumoviruses. We have made pseudorecombinant viruses in which the
RNAs 3 of these two viruses have been exchanged and recombinant viruses
containing chimeric RNA 3 molecules, in which the coat proteins and the
3'-end regions of CMV and TAV have been exchanged, giving rise to
recombinants designated RT3 and TR3. The replication properties and the
cell-to-cell and long-distance movement patterns of these pseudorecombinant
and recombinant viruses were examined in different hosts. All the viruses
were able to replicate and accumulate RNA 4 in protoplasts. The
pseudorecombinants and the R1R2RT3 recombinant infected tobacco
systemically, but the R1R2TR3 recombinant was not detectable, even in the
inoculated leaves. Comparison of the abilities of the viruses to replicate
in protoplasts and intact cucumber plants suggests that cell-to-cell
movement factors are also encoded by RNAs 1 and/or 2. Major determinants of
symptom severity in Nicotiana glutinosa are localized on the 3' part of RNA
3, and in Nicotiana benthamiana, more severe symptoms were observed with
the T1T2R3 strain than with the others tested.
Copyright © 1997, American Society for Microbiology
Biological properties of pseudorecombinant and recombinant strains created with cucumber mosaic virus and tomato aspermy virus
Agricultural Biotechnology Center, Institute for Plant Sciences, Godollo, Hungary.
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