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Similarly, the necrosis caused by mercuric chloride was reduced by the above anti\u2010senescence agents. In addition, in <jats:italic>in vitro<\/jats:italic> tests, leaves from selected paraquat\u2010tolerant tobacco plants were less sensitive to <jats:italic>Alternaria alternata<\/jats:italic> (Fr) Keissler infection than those of the control paraquat\u2010sensitive tobacco leaves. Paraquat\u2010tolerant <jats:italic>Conyza canadensis<\/jats:italic> (L) Cronq weeds naturally selected in vineyards in Hungary showed similar inhibition of senescence to paraquat\u2010tolerant tobacco, expressed as more green leaves and slower development. In accordance with this, the paraquat\u2010tolerant <jats:italic>Conyza<\/jats:italic> leaves remained almost symptomless, while paraquat\u2010sensitive plants showed severe symptoms after infection with <jats:italic>Botrytis cinerea<\/jats:italic> Pers. Oxidative burst (accumulation of hydrogen peroxide) was attenuated in TMV\u2010infected leaves of Xanthi\u2010nc tobacco as a result of treatment with salicylic acid or in leaves where systemic acquired resistance (SAR) had been induced by a previous TMV infection. Accordingly, superoxide dismutase (SOD) activity was higher in Xanthi tobacco leaves with SAR than without SAR. However, in NahG tobacco, in which SAR cannot develop, there was no augmentation of SOD activity. All the above data support the significance of delayed senescence and antioxidants in the resistance of plants to biotic and abiotic necrosis\u2010inducing agents.<\/jats:p><jats:p>\u00a9 2003 Society of Chemical Industry<\/jats:p>","DOI":"10.1002\/ps.706","type":"journal-article","created":{"date-parts":[[2003,3,14]],"date-time":"2003-03-14T12:06:44Z","timestamp":1047643604000},"page":"459-464","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":46,"title":["Role of reactive oxygen species and antioxidants in plant disease 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