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| Pb accumulation, growth and chlorophyll fluorescence of Conyza canadensis to different concentrations of Pb stress |
| Received:November 29, 2016 |
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| KeyWord:Conyza canadensis;Pb pollution;fluorescence parameters;biomass;Pb accumulation |
| Author Name | Affiliation | E-mail | | GAN Long | College of Hydraulic & Environmental Engineering, China Three Gorges University, Yichang 443002, China
Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education, China Three Gorges University, Yichang 443002
Innovation Center for Geo-Hazards and Eco-Environment in Three Gorges Area, Hubei Province, Yichang 443002, China | | | LUO Yu-hong | College of Hydraulic & Environmental Engineering, China Three Gorges University, Yichang 443002, China
Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education, China Three Gorges University, Yichang 443002
Innovation Center for Geo-Hazards and Eco-Environment in Three Gorges Area, Hubei Province, Yichang 443002, China | | | LI Xiao-ling | Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education, China Three Gorges University, Yichang 443002
Innovation Center for Geo-Hazards and Eco-Environment in Three Gorges Area, Hubei Province, Yichang 443002, China | | | XU Tao | Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education, China Three Gorges University, Yichang 443002
Innovation Center for Geo-Hazards and Eco-Environment in Three Gorges Area, Hubei Province, Yichang 443002, China | | | DAI Ze-long | Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education, China Three Gorges University, Yichang 443002
Innovation Center for Geo-Hazards and Eco-Environment in Three Gorges Area, Hubei Province, Yichang 443002, China | | | WANG Lin-quan | College of Hydraulic & Environmental Engineering, China Three Gorges University, Yichang 443002, China
Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education, China Three Gorges University, Yichang 443002
Innovation Center for Geo-Hazards and Eco-Environment in Three Gorges Area, Hubei Province, Yichang 443002, China | | | HUANG Ying-ping | College of Hydraulic & Environmental Engineering, China Three Gorges University, Yichang 443002, China
Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education, China Three Gorges University, Yichang 443002
Innovation Center for Geo-Hazards and Eco-Environment in Three Gorges Area, Hubei Province, Yichang 443002, China | chem_ctgu@126.com |
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| Abstract: |
| In order to reveal the effect of Pb stress on the growth and chlorophyll fluorescence characteristics of Conyza canadensis, the physiological mechanism of the tolerance to Pb was. Five Pb concentration gradients (0, 200, 500, 1000, 1500 mg·kg-1) were set in the experiment. The biomass (dry weight), Pb accumulation, chlorophyll content and chlorophyll fluorescence characteristics were analyzed studied under different concentrations of Pb stress. The results showed biomass (dry weight), plant height and chlorophyll content were all significantly inhibited at 1500 mg·kg-1 (P<0.05). Photochemical efficiency (Fv/Fm), photochemical quenching coefficient (qP), electron transfer rate (ETR) and effective quantum yield of photosystem Ⅱ (Fv'/Fm') of were not significant (P>0.05) at<1000 mg·kg-1. Fv/Fm, qP, ETR, Fv'/Fm' were significantly different from the control group at 1500 mg·kg-1 (P<0.05). This indicated that when the Pb concentration was less than 1000 mg·kg-1, the activity of the reaction center of C. canadensis was not affected, and the adaptability was strong. The Pb accumulation of over ground part and underground part of C. canadensis increased significantly with the increase of Pb concentration (P<0.05). When Pb concentration reached 1000 mg·kg-1, the Pb accumulation of ground part and underground part was the highest, which was 240.2 mg·kg-1 and 333.5 mg·kg-1, respectively. This indicated that C. canadensis has strong ability of Pb accumulate in polluted areas of Pb. In summary, when the Pb pollution is less than 1000 mg·kg-1, C. canadensis has strong adaptability to Pb stress. It also has potential application for remediation of lead contaminated soil. Therefore, it may be considered as a promising species to remediate lead contaminated soil. |
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