Comparative Plant Virology, Second Edition by Roger Hull

By Roger Hull

Comparative Plant Virology presents an entire assessment of our present wisdom of plant viruses together with history details on plant viruses and updated elements of virus biology and keep watch over. It offers as a rule with techniques instead of element. the focal point can be on plant viruses yet as a result of the altering surroundings of the way virology is taught, comparisons might be drawn with viruses of alternative kingdomes, animals, fungi and micro organism. it's been written for college students of plant virology, plant pathology, virology and microbiology who've no prior wisdom of plant viruses or of virology regularly. * packing containers spotlight vital details corresponding to virus definition and taxonomy.* contains profiles of 32 plant viruses that function broadly within the textual content* spouse site providng photograph financial institution* complete color all through

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IV. CLASSIFICATION AND NOMENCLATURE OF VIRUSES In all studies of natural objects, humans seem to have an innate desire to name and to classify everything. ” Virologists are no exception. Virus classification, as with all other classifications, arranges objects with similar properties into groups, and even 13 though this may be a totally artificial and human-driven activity without any natural base, it does have certain properties: • It gives a structured arrangement of the organisms so that the human mind can comprehend them more easily.

Wilting of the parts that are about to become necrotic often precedes such systemic necrotic disease. 7. Developmental Abnormalities Besides being generally smaller than normal, virus-infected plants may show a wide range of developmental abnormalities. Such changes may be the major feature of the disease or may accompany other symptoms. For example, uneven growth of the leaf lamina is often found in mosaic diseases. Dark green areas may be raised to give a blistering effect, and the margin of the leaf may be irregular and twisted.

The following arithmetic indicates the scale of our ignorance. In a major study on host range, 24 viruses were tested on 456 angiosperm species revealing 1,312 new host-virus combinations, or 12 percent of those tested. There may be about 250,000 species of angiosperms, and over 1,000 plant viruses have been recorded. If the 12 percent rate applied on average to all these plants and viruses, then there may be more than 27 Â 106 new compatible host-virus combinations awaiting discovery. In relation to this figure, the number of combinations already tested must be almost negligible.

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