Abstract
Local lesions induced by beet necrotic yellow vein virus (BNYVV) in Chenopodium amaranticolor were studied with the light and electron microscope. Histochemical staining reactions indicated that starch accumulates in cells beyond the limits of the lesions. These did not contain either suberins or lignins in detectable amounts. Callose was present, limited to necrosing or necrotic tissues but did not seem to occur in the cells of the chlorotic halo, which are physiologically active and contained much virus. Cytopathological modifications of infected cells were characterized by the presence of inclusion bodies located in the cytoplasm and composed of membranous elements (dictyosomal vesicles, endoplasmic reticulum strands), ribosomes and virus particles. Virions Varied gready in length and were never seen in orderly arrays. They were primarily associated with the inclusions. Cell wall modifications, including various types of thickenings and plugging of plasmodesmata, were observed throughout the lesions but their location and frequency was such as not to constitute the main factor for virus localization.
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