Abstract
The aphid Hyperomyzus lactucae (L.) can be systemically infected with the sowthistle yellow vein virus. Particles were found in the nucleoplasm as well as the cytoplasm of cells of the following organs: brain, subesophageal ganglion, main and accessory glands of the salivary system, esophagus, ventriculus, ovaries, fat body, mycetome, and muscle. No particles were found in cells of the posterior portions of the intestines, or in embryos. The evidence indicates that the virus is assembled in nuclei of cells. In this site they are uncoated. Synhymenosis, resulting in coated particles, occurs when virions pass from the nucleoplasm through the inner nuclear membrane into perinuclear cisterna formed by the outer nuclear envelope. At later stages the nuclear membrane disintegrates and masses of particles are released which can then be found in various arrangements of encapsulation within the cytoplasm of infected cells.
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