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- W2044416234 abstract "Abstract A virus inducing local lesions on globe amaranth has been named Gomphrena virus (GV) and was verified as closely related or identical to the lettuce necrotic yellows virus reported in Australia. Negatively stained dip preparations from plants infected with GV, revealed bacilliform particles. These, considered as GV particles, have a relatively complex structure, measuring 220–260 mμ in length and 80–100 mμ in diameter. They have an outer membrane, 8–10 mμ thick, provided with evenly spaced beadlike projections about 6–7 mμ long. Enveloped by this outer coat there is an inner tubular core, 200–240 mμ long and 60–70 mμ in diameter, with an axial channel 35–40 mμ wide, and exhibiting about 80–90 alternate light and dark cross bands, each 2.6 mμ wide. This inner core is interpreted as the virus nucleoeapsid. Examination of sections of osmium- and permanganate-fixed, Epon-embedded, tissues from infected plants under the light microscope, revealed inclusions, apparently intranuclear. These inclusions, when viewed in the electron microscope, were shown to consist of large numbers of particles, morphologically similar to those seen in dip preparations, usually arranged in two- or three-dimensional crystalline array within the membranes of the nuclear envelope. Sporadically, particles were also found within elements of the endoplasmic reticulum. Cells infected with GV usually showed some changes, the most conspicuous appearing in the nucleus, in which there was a reduction or disappearance of chromatic material and an abnormal increase in the size of the nucleolus, which usually was vacuolated. Frequently, tubular particles oriented at random and similar to the inner core of the GV particles, but with variable length, were found in the nuclear matrix or inside the nucleolar vacuoles. They also sometimes appeared in crystalline array or apparently being protruded from the nucleolus. Also what was interpreted as intermediary stages in the maturation process of GV particles were observed. In these, the tubular particles are enveloped by the inner membrane of the nuclear envelope, which buds toward the perinuclear space. It is pointed out that GV and other plant viruses provided with an outer envelope, constitute a new group in addition to the well known spherical and elongated plant viruses." @default.
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- W2044416234 date "1966-08-01" @default.
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- W2044416234 title "Morphology and developmental stages of Gomphrena virus" @default.
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- W2044416234 doi "https://doi.org/10.1016/0042-6822(66)90277-7" @default.
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