RT Journal Article SR Electronic(1) A1 Cabanne, F. A1 Scalla, R. A1 Martin, C.YR 1971 T1 Oxidase Activities during the Hypersensitive Reaction of Nicotiana xanthi to Tobacco Mosaic Virus JF Journal of General Virology, VO 11 IS 2 SP 119 OP 122 DO https://doi.org/10.1099/0022-1317-11-2-119 PB Microbiology Society, SN 1465-2099, AB When plant cells die as a result of virus infection, the activity of oxidases, particularly polyphenoloxidases and peroxidases, is altered (Martin, 1958; Farkas, Kiraly & Solymosy, 1960; Farkas et al. 1964). The in vitro activity of these two enzyme groups in extracts of infected leaves kept at 20° shows changes that are correlated with the time of appearance and number of local lesions. With most virus/host combinations, the oxidase concentration is merely increased (Van Kammen & Brouwer, 1964; Novacky & Hampton, 1968; Cabanne, Scalla & Martin, 1968), with some there is a change in the relative amount of different isozymes (Bates & Chant, 1970), and with others there is possibly the appearance of new peroxidases (Farkas & Stahmann, 1966) or of a new phenolase (John & Weintraub, 1967). Different workers have interpreted these facts to explain the formation of necrosis and virus localization in different ways (Farkas et al. 1960; Parish, Zaitlin & Siegel, 1965; Suseno & Hampton, 1966)., UL https://www.microbiologyresearch.org/content/journal/jgv/10.1099/0022-1317-11-2-119