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| Sulfur dioxide alleviates cadmium toxicity in the roots of foxtail millet seedlings |
| Received:October 21, 2016 |
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| KeyWord:foxtail millet;sulfur dioxide;cadmium;root;antioxidant system |
| Author Name | Affiliation | E-mail | | WANG Ya-li | School of Life Science, Shanxi University, Taiyuan 030006, China | | | YI Hui-lan | School of Life Science, Shanxi University, Taiyuan 030006, China | yihl@sxu.edu.cn | | HAN Yan-sha | School of Life Science, Shanxi University, Taiyuan 030006, China | |
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| Abstract: |
| Sulfur is an essential element for plant growth and responses to environmental stress. We show that exogenous SO2 derivates(SO32-:HSO3-, 3:1, mmol·L-1/mmol·L-1) alleviated cadmium(Cd) toxicity in foxtail millet(Setaria italica L.) seedlings, mainly focusing on seedling roots. The results show that 250 μmol·L-1 and 500 μmol·L-1 Cd markedly inhibited root growth, increased the production of reactive oxygen species(ROS), and caused higher levels of lipid peroxidation product malondialdehyde(MDA) in roots of foxtail millet seedling. Compared to Cd treatment alone, pretreatment with 500 μmol·L-1 SO2 derivates weakened the inhibitory effects of Cd on root length and dry weight, and decreased the ROS and MDA levels in millet roots under Cd stress. Moreover, the activities of peroxidase(POD), glutathione peroxidase(GPX) and glutathione S-transferase(GST) as well as glutathione(GSH) contents in SO2 pretreatment groups were also significantly higher than those in Cd treatment alone. These results indicate that activities of POD, GPX and GST enzymes, and increase of GSH content induced by SO2 pretreatment play important roles in plant adaptation to Cd stress. Our results suggest that SO2 could alleviate Cd-induced toxicity through activating antioxidant enzymatic and non-enzymatic components, which could enhance the detoxication capacity in plants. |
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