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| Physiological and biochemical responses to exogenous mercury stress in Brassica juncea and Eremochloa ciliaris |
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| Abstract: |
| Soil polluted by mercury is one of the most important environmental problems in the world. The paper mainly studied the absorption and accumulation of mercury and physiological and biochemical responses characteristics for plants in the polluted soil located in mercury production areas in Guizhou province. Brassica juncea and Eremochloa ciliaris seedlings were planted in soil containing different concentration (0, 0.5, 5, 15mmol/L) mercury (HgCl2), and physiological and biochemical responses characteristics and mercury accumulation of them were investigated. For B. juncea, the leaf area was 1.91 cm2 at 0.5 mmol/L of Hg for 7 days and was significantly higher than other treatments. CAT activities and MDA contents increased and SOD activities decreased with the increase of mercury concentration in the soil and the highest value of CAT and MDA was observed at 15 mmol/L of Hg. Meanwhile, mercury contents were the highest in the aerial parts (11 537.8 mg/kg). After 7 days of treatment at 5 and 15 mmol/L of Hg, mercury content in the aerial parts were 10 141.8 mg/kg and 11 537.8 mg/kg, respectively, were significantly higher than those of other treatments. When the treated time were delayed for 14 days, mercury content accumulated in the plants were lower than that for 7 days. For E. ciliaris, fresh weight in underground part increased significantly for 7 days at 5 mmol/L of Hg. At the same time,mercury content in aerial part had the highest value (1 241.870 mg/kg). Mercury content increased rapidly with delaying of cultural time. CAT and SOD activities decreased with the increase of mercury concentration in soil. MDA content increased at the beginning of treatment and declined later. B.juncea and E. ciliaris could be recommended as a plant to remediate polluted soil located in Guizhou province.The accumulated mercury of aerial part in B. juncea was higher than that in E. ciliaris. While E. ciliaris had more tolerance to mercury stress. |
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