Journal
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
Volume 9, Issue 8, Pages 2827-2838Publisher
MDPI
DOI: 10.3390/ijerph9082827
Keywords
cadmium; soybean; oxidative stress; antioxidative response; bioindicator
Funding
- Scientific Research Foundation for the Returned Overseas Chinese Scholars
- State Education Ministry
- Anhui Provincial Natural Science Foundation [090411013]
- Foundation of the Provincial Key Laboratory of the Conservation and Exploitation of Biological Resources in Ecological Safety in Anhui Province
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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 x exposure time interaction. Increase of proline content may be a response to acute heavy metal toxicity in soybean seeds.
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