Abstract
We discovered a soybean mosaic virus (SMV) variant (4278-1) that caused systemic infections in Nicotiana benthamiana plants, resulting in stem stunting and leaf shriveling. The virus had a particle morphology and incubation period similar to those of other SMV isolates but differed from them in the leaf symptoms it caused when infecting soybean and N. benthamiana. The genome of this variant consisted of a 9994-nt single-stranded RNA, which was different from most of the other known SMV isolates (approximately 9600 nt). Interestingly, we found evidence that two recombination events (nt 1-476 and nt 1145-1349) had occurred between 4278-1 and a watermelon mosaic virus analogue (WMV analogue), in the 5' untranslated region and the P1 cistron.
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