Abstract
This chapter discusses the variety of origins that can be inferred from the genetic information now available for the many single stranded-RNA viruses and for the many that are awaiting discovery. The word “vagaries” is used to convey the curious and unusual nature of Pea enation mosaic virus (PEMV) and a group of possibly eight to twelve viruses that exhibit similar lifestyles. The first reference to the “mosaic disease of the sweet pea” was made in 1914. Besides the mosaic symptoms, PEMV can produce hyperplastic outgrowths (enations) on the underside of infected leaves. The virus is mechanically as well as aphid transmissible. PEMV infections are recognized five to seven days after inoculation by the downward curling of the leaves of inoculated pea plants, followed by the appearance of chlorotic and translucent spots on the leaves. Symptoms are variable depending on the host, the virus isolate, and the environment. PEMV infections are accompanied by diagnostic and characteristic cytopathological effects that are reminiscent of those caused by the members of the Luteoviridae.
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