Biologia plantarum 2014, 58:773-777 | DOI: 10.1007/s10535-014-0412-y

Effect of cadmium on antioxidative enzymes, glutathione content, and glutathionylation in tall fescue

D. Del Buono1,*, T. Mimmo2, R. Terzano3, N. Tomasi4, S. Cesco2
1 Dipartimento di Scienze Agrarie, Alimentari e Ambientali, Università degli Studi di Perugia, Perugia, Italia
2 Facoltà di Scienze e Tecnologie, Libera Università di Bolzano, Bolzano, Italia
3 Dipartimento di Scienze del Suolo, della Pianta e degli Alimenti, Università degli studi di Bari "Aldo Moro", Bari, Italia
4 Dipartimento di Scienze Agrarie e Ambientali, Università di Udine, Udine, Italia

The aim of this work was to assess the effect of different Cd2+concentrations on some antioxidant enzymes in Festuca arundinacea. Increased activities of ascorbate peroxidase, monodehydroascorbate reductase, dehydroascorbate reductase, glutathione S-transferase, and glutathione reductase were ascertained in response to low Cd2+ concentrations (0-20 μM), whereas the enzyme activities were less increased or decreased at a higher Cd2+ dosage (50 μM) and a longer exposure. The content of reduced glutathione (GSH) decreased significantly with increasing Cd2+ concentrations, whereas the content of oxidized glutathione (GSSG) increased proportionally to the amount of Cd2+ applied. Further experiments, performed by incubating the enzyme extracts with oxidized glutathione, evidenced that the addition of GSSG to the incubation mixtures caused significant decreases of some enzymatic activities. Finally, the effect of glutathione S-transferase, FaGST I, extracted from fescue seedlings and purified till homogeneity, on these enzyme activities was investigated. It was found that FaGST I enhanced the decreased enzymatic activities caused by GSSG.

Keywords: ascorbate peroxidase; dehydroascorbate reductase; Festuca arundinacea; glutathione peroxidase; glutathione reductase; glutathione S-transferase; monodehydroascorbate reductase; oxidative stress
Subjects: cadmium; ascorbate peroxidase; peroxidase; glutathione reductase; glutathione S-transferase; tall fescue
Species: Festuca arundinacea

Received: October 4, 2013; Revised: January 22, 2014; Accepted: February 6, 2014; Published: December 1, 2014Show citation

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Buono, D., Mimmo, T., Terzano, R., Tomasi, N., & Cesco, S. (2014). Effect of cadmium on antioxidative enzymes, glutathione content, and glutathionylation in tall fescue. Biologia plantarum58(4), 773-777. doi: 10.1007/s10535-014-0412-y.
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