Effects of Probenazole and Saccharin on Symptom Appearance of Tobacco Mosaic Virus in Tobacco

Abstract

Probenazole, an inducer of systemic acquired resistance against fungi and bacteria, and its metabolite saccharin were tested for their effect on virus infection. When applied to the soil of potted tobacco (Nicotiana tabacum cv. Xanthi nc) plants, both compounds promoted the appearance of local lesions by tobacco mosaic virus and reduced lesion size. Probenazole enhanced the masking of mosaic symptoms in the systemic host, tobacco cv. Samsun. These facts indicate that probenazole and saccharin induced a broad spectrum of disease resistance in plants.