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• W2137194969 abstract "Extracellularly secreted peroxidases in cell suspension culture of tobacco (Nicotiana tabacum L. cv. Bright Yellow-2, cell line BY-2) catalyse the salicylic acid (SA)-dependent formation of active oxygen species (AOS) which, in turn, triggers an increase in cytosolic Ca2+ concentration. Addition of horseradish peroxidase (HRP) to tobacco cell suspension culture enhanced the SA-induced increase in cytosolic Ca2+ concentration, suggesting that HRP enhanced the production of AOS. The mechanism of peroxidase-catalysed generation of AOS in SA signalling was investigated with chemiluminescence sensitive to AOS and electron spin resonance (ESR) spectroscopy, using the cell suspension culture of tobacco, and HRP as a model system of peroxidase reaction. The results showed that SA induced the peroxidase inhibitor-sensitive production of superoxide and H2O2 in tobacco suspension culture, but no production of hydroxy radicals was detected. Similar results were obtained using HRP. It was also observed that SA suppressed the H2O2-dependent formation of hydroxy radicals in vitro. The results suggest that SA protect the cells from highly reactive hydroxy radicals, while producing the less reactive superoxide and H2O2 through peroxidase-catalysed reaction, as the intermediate signals. The formation of superoxide was followed by that of H2O2, suggesting that superoxide was converted to H2O2. In addition, it was observed that superoxide dismutase-insensitive ESR signal of monodehydroascorbate radical was induced by SA both in the tobacco suspension culture and HRP reaction mixture, suggesting that SA free radicals, highly reactive against ascorbate, were formed by peroxidase-catalysed reactions. The formation of SA free radicals may lead to subsequent monovalent reduction of O2 to superoxide." @default.
• W2137194969 created "2016-06-24" @default.
• W2137194969 creator A5001594904 @default.
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• W2137194969 date "2000-04-01" @default.
• W2137194969 modified "2023-10-13" @default.
• W2137194969 title "Mechanism of peroxidase actions for salicylic acid-induced generation of active oxygen species and an increase in cytosolic calcium in tobacco cell suspension culture" @default.
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• W2137194969 doi "https://doi.org/10.1093/jexbot/51.345.685" @default.
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