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| Impact of high concentrations of heavy metals in agricultural soil on heavy metals accumulation and physiological characteristics of rice(Oryza sativa L.) in karst areas in Guangxi, China |
| Received:June 30, 2017 |
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| KeyWord:karst;multiple heavy metals pollution;rice (Oryza sativa L.);heavy metals accumulation;plant enzyme activity |
| Author Name | Affiliation | E-mail | | CHANG Kai-xuan | Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China
Guangxi Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin 541004, China | | | YE Li-li | Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China
Guangxi Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin 541004, China | | | CHEN Yong-shan | School of Resources and Environmental Science, Quanzhou Normal University, Quanzhou 362000, China | | | JIANG Jin-ping | Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China
Guangxi Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin 541004, China | jiangjinping74@163.com |
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| Abstract: |
| A pot experiment was conducted to evaluate the impact of multiple heavy metals stress on the growth of rice plants in agricultural soil of karst areas. The influence of different levels of heavy metals pollution in agricultural soil was investigated with respect to plant height and biomass, heavy metals accumulation in rice plants, and physiological parameters, including the activities of superoxide dismutase(SOD) and peroxidase(POD), and the contents of chlorophyll(Chl) and malondialdehyde(MDA). The results showed that the plant height and biomass of rice were significantly(P<0.05) reduced with an increase of the pollution load index(PLI), and the rice plant gradually died at an early stage when the PLI was 5.96. Compared with controls(no pollution), the plant height of rice in treatments I to V was reduced by 32.79%, 30.99%, 69.14%, 73.55%, and 63.40%, and the above-ground biomass was reduced by 42.89%, 37.77%, 93.44%, 79.98%, and 85.88%, respectively. Both the plant height and biomass showed significant differences among the five treatments(P<0.05). The concentrations of heavy metals in the below-ground part of the rice plants were higher than those in the above-ground parts. The accumulation levels of heavy metals were in the order of Zn > Cd > Pb > Hg > As, whereas the bioaccumulation coefficients(BCF) were in the order of Cd > Hg > Zn > As > Pb. Significantly positive correlations were found between PLI and POD, SOD, and MDA in the leaves. However, PLI was negatively correlated with the Chl content. The maximum level of SOD was 235.02 U·g-1 FW at PLI=4.36, and the maximum levels of POD and MDA were 155.54 U·g-1 FW and 41.48 nmol·g-1 FW, respectively, at PLI=5.96. Damage to rice caused by multiple metals pollution in the soil could be reduced through the antioxidant enzyme system, but the pollution nevertheless caused gradual death when the PLI was too high to allow for rice growth. |
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