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Expression of the n gene in isolated tobacco nicotiana tabacum protoplasts


, : Expression of the n gene in isolated tobacco nicotiana tabacum protoplasts. Fiziologiya Rastenii (Moscow) 33(1): 159-164

The effect of infection with tobacco mosaic virus was examined on the viability of protoplasts isolated from the leaf mesophyll of Nicotiana tabacum L., cv. Samsun (a sensitive host) and cv. Xanthi nc. (a hypersensitive host). Either the plants were infected before protoplast isolation, or the protoplasts were infected with the virus after isolation. The protoplasts isolated from diseased Xanthi nc. plants during emergence of necrosis were of low viability, but when the protoplasts were infected after isolation, they remained viable. Therefore, the expression of the gene of necrotic response (the N gene) in the first case is suggested to be induced by inoculated leaves just before protoplast isolation. No decrease in viability was observed in the protoplasts isolated from the leaves of healthy or diseased Samsun plants, as well as from the leaves of healthy Xanthi nc. plants or from the leaves with developed necrosis. The N gene was not induced if the infected Xanthi nc. plants were kept at 32.degree. , and the protoplasts from those leaves were not destroyed. The role of tissue integrity, the existence of cell walls in particular, in the N gene expression is discussed.

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