Antioxidant enzyme activities in Allium species and their cultivars under water stress
2007
Csiszar, J.,University of Szeged (Hungary). Dept. of Plant Biology | Lantos, E.,University of Szeged (Hungary). Dept. of Plant Biology | Tari, I.,University of Szeged (Hungary). Dept. of Plant Biology | Madosa, E.,Banat's Univ. of Agricultural Sciences, Timisoara (Romania). Inst. of Plant Biotechnology | Wodala, B.,University of Szeged (Hungary). Dept. of Plant Biology | Vashegyi, A.,University of Szeged (Hungary). Dept. of Plant Biology | Horvath, F.,University of Szeged (Hungary). Dept. of Plant Biology | Pecsvaradi, A.,University of Szeged (Hungary). Dept. of Plant Biology | Szabo, M.,University of Szeged (Hungary). Dept. of Plant Biology | Bartha, B.,University of Szeged (Hungary). Dept. of Plant Biology | Galle, A.,University of Szeged (Hungary). Dept. of Plant Biology | Lazar, A.,Banat's Univ. of Agricultural Sciences, Timisoara (Romania). Inst. of Plant Biotechnology | Coradini, G.,Banat's Univ. of Agricultural Sciences, Timisoara (Romania). Inst. of Plant Biotechnology | Staicu, M.,Banat's Univ. of Agricultural Sciences, Timisoara (Romania). Inst. of Plant Biotechnology | Postelnicu, S.,Banat's Univ. of Agricultural Sciences, Timisoara (Romania). Inst. of Plant Biotechnology | Mihacea, S.,Banat's Univ. of Agricultural Sciences, Timisoara (Romania). Inst. of Plant Biotechnology | Nedelea, G.,Banat's Univ. of Agricultural Sciences, Timisoara (Romania). Inst. of Plant Biotechnology | Erdei, L.,University of Szeged (Hungary). Dept. of Plant Biology
We compared the enzymatic antioxidative defence mechanisms of some regional subspecies of Allium (A. cepa, A. ascalonicum auct. hort., A. sativum) cultivated mainly in the western regions of Romania and two modern Hungarian climate resistant F1 hybrids. The variability in the activities of antioxidant enzymes superoxide dismutase, catalase, peroxidase (POD), glutathione reductase (GR) and glutathione S-transferase (GST) and their changes under soil moisture stress were investigated. One-week-long water stress revealed that among three Allium species, relative water content decreased only in A. ascalonicum leaves (up to 16%). Unlike root enzymes, the activities of the shoot enzymes, especially POD, GR and GST, showed a stronger correlation with the water content of the leaves after one week of water withdrawal; regression coefficients (R2) were 0.359, 0.518 and 0.279, respectively.
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