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- W2028214355 abstract "A short description is given of an apparently new virus disease of the mosaic type attacking the wild sunflower (Helianthus annuus L.). Its rapid spread in the field denotes an insect-vector, probably an aphid, but its identity is not yet established. Four major types of pathological changes were observed in the mesophyll cells: (a) cytoplasmic inclusions; (b) changes in the structure and type of plastid; (c) abnormalities in the nucleus; (d) presence of virus-like particles within the leaf cells. Crystalline inclusions were also present in both normal and infected cells. The cytoplasmic inclusions are of three types: whorls resembling “pinwheels”; long rods of composite structure attached to the pinwheels and resembling a “cat-o-nine-tails”; and circular inclusions of lamellate construction. Evidence suggesting that these inclusions do not consist of virus is given; but the possibility that they may consist of viral protein is considered. The pinwheels and rods are shown to have an intimate connection with the endoplasmic reticulum. The plastids undergo longitudinal division with the production of a fifth intervening layer, a phenomenon not hitherto recorded. The nucleus becomes swollen and completely filled with spherical or near-spherical particles with which are associated numerous fine threads. The virus particles are long flexible rods measuring at least 480 × 13 mμ; they are few in number and occur in association with the outer surface of the plastids. A discussion of these findings is appended." @default.
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- W2028214355 date "1967-07-01" @default.
- W2028214355 modified "2023-10-09" @default.
- W2028214355 title "Electron microscopy of virus-infected sunflower leaves" @default.
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- W2028214355 doi "https://doi.org/10.1016/s0022-5320(67)80067-4" @default.
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