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Polyphenol Oxidase Activity of Nicotiana glutinosa Leaves infected with Tobacco Mosaic Virus

Naturevolume 187pages10481049 (1960) | Download Citation



WHEN local necrotic lesions appeared on the leaves of Nicotiana glutinosa L. infected with tobacco mosaic virus, but not before, the respiration-rate increased1. The same phenomenon was observed on some other host–virus combinations which produced local necrotic lesions2. In these cases, it seems that the increased rate of respiration varies with various developmental stages of the necrotic lesions, namely, with degrees of brownish discoloration of leaf tissue due to the virus infection. When the tissues of the tobacco plant are injured, the polyphenol substances are oxidized and then polymerized by polyphenol oxidase3. Therefore the polyphenol oxidase activity of leaves bearing necrotic lesions has been compared with that of healthy leaves.

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    Owen, P. C., Ann. App. Biol., 46, 198 (1958). Yamaguchi, A., and Hirai, T., Phytopath., 49, 447 (1959).

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    Yamaguchi, A., Virology, 10, 287 (1960).

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    Shiroya, M., Shiroya, T., and Hattori, S., Physiol. Plantarum, 8, 594 (1955).

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    Bonner, jun., W. D., Ann. Rev. Plant Physiol., 8, 427 (1957).

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    Farkas, G. L., and Király, Z., Phytopathol. Z., 31, 251 (1958). Király, Z., and Farkas, G. L., ibid., 34, 341 (1959). Solymosy, F., Farkas, G. L., and Király, Z., Nature, 184, 706 (1959). Uritani, I., and Akazawa, T., “Plant Path.”, 1, 349 (Academic Press, New York, 1959).

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  1. Plant Pathology Laboratory, Faculty of Agriculture, Nagoya University, Anzyo, Japan



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