Cauliflower Mosiac Virus (CaMV) -

CaMV contains about 8 kb double-strand DNA genome and produces Spherical particles. CaMV infections are systemic, and even its DNA is infectious when inoculated on abraded plant surfaces.

CaMV genome has 8 tightly packed genes, of which only two small genes, genes II and VII, are nonessential; as a result, only these two genes can be replaced/deleted without a loss of infectivity. In addition, CaMV genomes exceeding the natural genome size (8024 bp) by even a few hundred bp are not packaged into virions.