Impact of cadmium and hydrogen peroxide on ascorbate-glutathione recycling enzymes in barley root
Zelinova, V., Slovak Academy of Sciences, Bratislava (Slovak Republic). Inst. of Botany | Bocova, B., Slovak Academy of Sciences, Bratislava (Slovak Republic). Inst. of Botany | Huttova, J., Slovak Academy of Sciences, Bratislava (Slovak Republic). Inst. of Botany | Mistrik, I., Slovak Academy of Sciences, Bratislava (Slovak Republic). Inst. of Botany | Tamas, L., Slovak Academy of Sciences, Bratislava (Slovak Republic). Inst. of Botany
We analysed the effect of Cd and H2O2 short-term treatments on the activity of ascorbate-glutathione recycling enzymes in barley root tip. Even a short transient exposure of barley roots to low 15 microM Cd concentration caused a marked approximately 70% root growth inhibition. Higher Cd concentrations caused root growth cessation during the first 6 h after short-term Cd treatment. Similarly, a marked root growth inhibition was also detected after the short-term exposure of barley seedlings to H2O2. Our results indicate that root ascorbate pool is more sensitive to Cd treatment than glutathione pool. Rapid activation of dehydroascorbate reductase and monodehydroascorbate reductase is the important component of stress response to the Cd-induced alterations in barley root tips. H2O2 is probably involved in the Cd-induced activation of monodehydroascorbate reductase, but it is not involved in the Cd-induced increase of dehydroascorbate reductase activity.
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