Properties of potyvirus RNAs: turnip mosaic, tobacco etch, and maiza dwarf mosaic viruses

Maize Dwarf Mosaic Virus: From Genome to Disease Management

Maize dwarf mosaic virus (MDMV) is a serious maize pathogen, epidemic worldwide, and one of the most common virus diseases for monocotyledonous plants, causing up to 70% loss in corn yield globally since 1960. MDMV belongs to the genus Potyvirus (Potyviridae) and was first identified in 1964 in Illinois in corn and Johnsongrass. MDMV is a single stranded positive sense RNA virus and is transmitted in a non-persistent manner by several aphid species. MDMV is amongst the most important virus diseases in maize worldwide. This review will discuss its genome, transmission, symptomatology, diagnosis and management. Particular emphasis will be given to the current state of knowledge on the diagnosis and control of MDMV, due to its importance in reducing the impact of maize dwarf mosaic disease, to produce an enhanced quality and quantity of maize.

Association of tobacco etch virus related RNA with chloroplasts in extracts of infected plants

The RNA in various subcellular fractions of tobacco etch virus (TEV) infected tissue was analyzed for the presence of complementary viral RNA, and double-stranded viral RNA by hybridization with 32P-labeled viral RNA or cDNA probes. Although viral RNA was detected in several cellular fractions, the complementary RNA of full-length size was found exclusively associated with fractions containing chloroplasts. Treatment of RNAs with RNase before hybridization suggested that the virus-related complementary RNA was present in double-stranded form.