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Ultrastructural characteristics of viral pathogenesis in young tobacco nicotiana tabacum cultivar samsun leaf tissues as affected by systemic infection with tobacco mosaic virus



Ultrastructural characteristics of viral pathogenesis in young tobacco nicotiana tabacum cultivar samsun leaf tissues as affected by systemic infection with tobacco mosaic virus



Fiziologiya Rastenii (Moscow) 30(1): 115-122



Ultrastructural [by EM] characteristics were studied of palisade parenchyma cells in young tobacco leaves systemically infected with tobacco mosaic virus (TMV). Cell components preserve their structural integrity and active functional state, i.e., manifest resistance to infection, at the early stages of pathogenesis (when separate particles or small aggregations of TMV appear in the cells). Appreciable increase in the number of dictyosomes characterized by relatively high secretory activity in palisade cells is a typical trait of infection during this period. The development of infection is accompanied by accumulation of a significant number of virions in the cells and various anomalous changes. The specific tubular inclusions usually formed during multiplication of TMV were not clarified. At the same time, granular-fibrillar inclusions and minute electron-dense granules were observed in infected cells. At all of the investigated stages of pathogenesis, abnormally osmiophilic particles of TMV were detected together with normal ones. Such particles were capable of fusing to form clusters, in which individual virions were not distinguishable or were distinguiable with difficulty. Possibly, the appearance of such viral particles is caused by destructive changes of them occurring under the influence of hydrolases. Characteristics of interaction of the virus with cell vacuoles were discussed.

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