Panicum mosaic virus (PMV) induces a mild mottle on millet plants, but the
addition of its satellite virus (SPMV) causes a severe chlorosis and stunti
ng. Immunoblots, RNA blots, and sucrose density gradient analyses revealed
increases of PMV RNA and its p8 and capsid proteins when plants were co-inf
ected with SPMV. A unique feature associated with this satellite virus inte
raction was an increased rate of systemic infection of PMV.