Abstract
The development of a nuclear polyhedrosis virus (NPV) in larval midgut cells of the armyworm, Pseudaletia unipuncta, is similar to that of other NPV. In the nucleus, the envelopes around the nucleocapsids seem to be derived de novo or from the inner layer of the nuclear envelope wich forms cisternae, blebs, or infoldings. The nucleocapsids are also enveloped by synhymenosis during passage through the nuclear membrane, the cell membrane, or the endoplasmic reticulum membrane. Both enveloped and unenveloped nucleocapsids may enter the cytoplasm through the nuclear pore or budding through the nuclear membrane. From the cytoplasm the virions may enter the hemocoel through the basal cell and basement membranes or through the endoplasmic reticulum, intercellular space, and the basement membrane.
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