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| Effects of cadmiumstresses on growth and antioxidant activities of Neyraudia reynaudiana |
| Received:November 15, 2015 |
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| KeyWord:Neyraudia reynaudiana;cadmium stress;phytoremediation;antioxidant activity;uptake |
| Author Name | Affiliation | E-mail | | HAN Hang | Forestry College of Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | CHEN Xue-jiao | Forestry College of Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | HOU Xiao-long | Forestry College of Fujian Agriculture and Forestry University, Fuzhou 350002, China | xl,hou@fafu.edu.cn | | LIU Ai-qin | Forestry College of Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | CAI Li-ping | Forestry College of Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | ZHOU Chui-fan | Forestry College of Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | MA Xiang-qing | Forestry College of Fujian Agriculture and Forestry University, Fuzhou 350002, China | |
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| Abstract: |
| Neyraudia reynaudiana is a hard plant that can grow in poor soil, even in heavy metal polluted soils. Here we examined physiological indexes of N. reynaudiana under different Cd stresses and discussed the response mechanisms of N. reynaudiana growth in Cd-polluted mining area. Low Cd concentrations had certain promotional effects on the number of tiller and leaf, the plant height and the maximum leaf length. However, increasing Cd concentrations caused inhibitory effects on plant. The length and surface area of N. reynaudiana roots were significantly inhibited even at low Cd stresses. However, the average diameter and volume of the roots were promoted by ≤100 mg Cd·kg-1 and ≤50 mg Cd·kg-1, respectively. Cadmium stresses reduced antioxidant activity, but increased MDA content of N.reynaudiana. Cadmium content gradually increased in the roots and aboveground parts of N. reynaudiana under different Cd stresses. Transfer coefficient of Cd was greater than one, indicating the accumulation ability of Cd by the plant. These findings indicate that Cd stresses inhibit the activity of antioxidant enzymes, resulting in the decreases in the growth of N. reynaudiana; however, N. reynaudiana could adapt the Cd stresses through adjusting the growth pattern, increasing root diameter and surface area and stimulating the transportation capacity of Cd to the aboveground. |
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