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Effect of senescence on lesion formation and the level of induced resistance in tobacco cultivar samsun nn plants infected with tobacco mosaic virus 2. topography of tobacco mosaic virus resistance in samsun nn leaves



Effect of senescence on lesion formation and the level of induced resistance in tobacco cultivar samsun nn plants infected with tobacco mosaic virus 2. topography of tobacco mosaic virus resistance in samsun nn leaves



Acta Botanica Croatica 40: 19-30



Mechanical inoculation of leaves of 'Samsun NN' tobacco with a TMV [tobacco mosaic virus] suspension causes the formation of necrotic lesions, the number and size of which depends on the physiological age of infected tissues. Lesions at the periphery of the leaf blade are usually much larger than those closer to the main vein. This difference reflects a natural decrease in TMV resistance, directed from the center of the leaf to its margins. TMV infection of one half of the leaf induces a certain level of resistance against viral invasion in the other half. This induction is much stronger in the area near the main vein of the leaf, than in its marginal parts. It is also more pronounced in the young leaves as compared with the older ones. A gradual shift in the repartition of the necrotized tissues occurs, proceeding from the center of the leaf blade to its periphery, parallel to the increasing level of induced resistance. Reinfection of resistant half-leaves with TMV results in the formation of a great number of minute necrotic lesions. This decreases the calculated values of average lesion sizes, and causes their strongly skewed distribution around the mean.

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