Oxidative Response and Antioxidative Mechanism in Germinating Soybean Seeds Exposed to Cadmium

Shiyong Yang, Jianchun Xie and Quanfa Li
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Shiyong Yang: Section of Ecology, School of Life Sciences, Anhui Normal University, Wuhu 241000, China
Jianchun Xie: School of Environmental Science and Engineering, Anhui Normal University, Wuhu 241000, China
Quanfa Li: Section of Ecology, School of Life Sciences, Anhui Normal University, Wuhu 241000, China

IJERPH, 2012, vol. 9, issue 8, 1-12

Abstract: Seeds of soybean ( Glycine max L.) exposed to 50 mg/L (Cd50), 100 mg/L (Cd100) and 200 mg/L (Cd200) cadmium solution for 24, 48, 72 and 96 h were examined with reference to Cd accumulation, oxidative stress and antioxidative responses. Soybean seeds accumulated Cd in an exposure time-and dosage-dependent manner. FRAP (ferric reducing ability of plasma) concentration, GSH/hGSH content, and GST activity showed a pronounced exposure time-dependent response. Cd100 enhanced FRAP concentration in germinating soybean seeds as compared to Cd50 treatment after 24 h exposure. Cd200 however increased statistically GST activities after 72 and 96 h exposure. Under all Cd dosages, GSH/hGSH concentrations were depressed with increasing exposure time. Reduction of GSH/hGSH content and concomitant increase of GST activity suggested a possible participation of GSH into GSH-Cd conjugates synthesis. MDA content is a potential biomarker for monitoring Cd phytotoxicity because it responds significantly to treatment dosage, exposure time and dosage ´ exposure time interaction. Increase of proline content may be a response to acute heavy metal toxicity in soybean seeds.

Keywords: cadmium; soybean; oxidative stress; antioxidative response; bioindicator (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2012
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