Induction of oxidative stress and GPX‐like protein activation in tomato plants after mechanical stimulation
Identifieur interne : 002F36 ( Main/Exploration ); précédent : 002F35; suivant : 002F37Induction of oxidative stress and GPX‐like protein activation in tomato plants after mechanical stimulation
Auteurs : Nathalie Depège [France] ; Michèle Varenne [France] ; Nicole Boyer [France]Source :
- Physiologia Plantarum [ 0031-9317 ] ; 2000-10.
Abstract
In Lycopersicon esculentum Mill. (cv. VFN8), mechanical stimulation induced a rapid and transient increase of with hydrogen peroxide (H2O2), a part of an oxidative burst. The reaction was followed by an antioxidative response, with the involvement of phospholipid hydroperoxide glutathione peroxidase (PHGPX)‐like protein (EC 1.11.1.9). Induction of expression of two putative PHGPX genes was observed in rubbed internodes. To characterize the importance of this antioxidant gene, enzymatic activities of glutathione peroxidase (GPX) and PHGPX were measured, respectively, H2O2 and hydroperoxide lipid as oxidant. Only PHGPX activities were induced by the mechanical treatment, suggesting a major role of PHGPX in the mechanisms of antioxidant defence in plant.
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DOI: 10.1034/j.1399-3054.2000.110210.x
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(cv. VFN8), mechanical stimulation induced a rapid and transient increase of with hydrogen peroxide (H2O2), a part of an oxidative burst. The reaction was followed by an antioxidative response, with the involvement of phospholipid hydroperoxide glutathione peroxidase (PHGPX)‐like protein (EC 1.11.1.9). Induction of expression of two putative PHGPX genes was observed in rubbed internodes. To characterize the importance of this antioxidant gene, enzymatic activities of glutathione peroxidase (GPX) and PHGPX were measured, respectively, H2O2 and hydroperoxide lipid as oxidant. 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