PJB-2017-639
Effects of Cd-added on ascorbate-glutathione cycle of young citrus seedlings under selenite or SeMet-enriched soil
Xieping Sun
Abstract
Abstract. In order to detect the affection of cadmium (Cd)-added treatments on citrus ascorbate-glutathione (AsA-GSH) cycles efficiency under selenite or selenomethionine (SeMet)-enriched soil, the contents of leaf pigments, H2O2, antioxidants and antioxidases in AsA-GSH cycles were detected in ‘Daya’ citrus seedlings (Citrus sinensis L.). The results showed that chlorophyll a, b, and a+b were significantly enhanced by Cd-added under SeMet-enriched treatment, while leaf pigments under selenite-enriched treatment showed little influence by Cd. Meanwhile, Cd-added treatments significantly increased H2O2 concentrations both under selenite and SeMet-enriched soils. In AsA-GSH cycle, the concentrations of AsA, dehydroascorbate (DHA), and AsA/(AsA+DHA) ratio were increased, while the levels of GSH, oxidized glutathione (GSSG), and GSH/(GSH+GSSG) were reduced by Cd-added under selenite or SeMet-enriched soil. Meanwhile, the activities of ascorbate peroxidase (APX), monodehydroascorbate reductase (DHAR), and glutathione reductase (GR) were increased, and the activities of glutathione peroxides (GPX) were decreased under Cd-added two forms Se-enriched soils. Our results indicated that despite there are positive impaction by Cd-added treatments on chlorophyll concentrations under Se-enriched soil, leaf underwent injury by increasing H2O2 concentration. Furthermore, the AsA-GSH cycle efficiency were increased to defend Cd stress under two Se forms-enriched treatments.
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