Satellite RNA of Barley Yellow Dwarf-RPV Virus Reduces Accumulation of RPV Helper Virus RNA and Attenuates RPV Symptoms in Oats. Lada Rasochova. Plant Pathology Department; and Molecular, Cellular and Developmental Biology Program, Iowa State University, Ames, IA 50011 U.S.A. W. Allen Miller; Plant Pathology Department; and Molecular, Cellular and Developmental Biology Program, Iowa State University, Ames, IA 50011 U.S.A. MPMI 9:646-650. Accepted 3 June 1996.

Infectious transcripts of satellite (satRPV) RNA of RPV barley yellow dwarf luteovirus were transmitted to oat plants by aphids (Rhopalosiphum padi) that acquired virus from satellite-infected oat protoplasts. Plants infected with RPV and satRPV RNA had milder symptoms than those infected with RPV helper virus alone. Presence of satRPV RNA reduced RPV helper RNA accumulation in plants and protoplasts. SatRPV RNA did not affect symptoms caused by the severe mixed infection of RPV and PAV barley yellow dwarf viruses and had no effect on PAV RNA accumulation.