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| Cadmium Tolerance and Uptake Characteristics in Pittosporum tobira in Contaminated Soil |
| Received:November 11, 2014 |
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| KeyWord:cadmium;ornamental plant;Pittosporum tobira;malondialdehyde content;phytoremediation |
| Author Name | Affiliation | E-mail | | CAO Xia | Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, China | | | GUO Zhao-hui | Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, China | zhguo@csu.edu.cn | | XIAO Xi-yuan | Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, China | | | LIU Ya-nan | Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, China | | | ZENG Peng | Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, China | |
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| Abstract: |
| A pot experiment was conducted to study the cadmium(Cd) tolerance and uptake characteristics of Pittosporum tobira grown in Cd contaminated soil. Results showed that the growth of Pittosporum tobira was enhanced at 9.6 mg Cd·kg-1 soil, but reduced at 24.6 mg Cd·kg-1 soil. Pittosporum tobira showed capacity to accumulate Cd, and the Cd content in Pittosporum tobira increased with soil Cd content. Compared with the control(3.6 mg Cd·kg-1 soil), no significant differences were observed in root, stem and leaf dry biomass and chlorophyll a, chlorophyll b, carotenoid and malondialdehyde(MDA) contents of Pittosporum tobira grown in a soil with 9.6 mg·kg-1 for 154 days. However, in 24.6 mg·kg-1 soil, root, stem and leaf dry biomass reduced by 38.7%, 5.2% and 52.5% over the control, respectively, and the contents of chlorophyll a, chlorophyll b and carotenoid in leaves were 71.3%, 68.2% and 75% of the control, whereas leaf MDA content was 152% of the control. This study suggests that Pittosporum tobira can be regarded as a candidate to remediate Cd contaminated soils while improving the scenes of contaminated environment. |
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