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| Mechanism study on the phytoremediation of cadmium- and arsenic-contaminated soil by Polygonaceae plants with Enterobacter sp. |
| Received:September 12, 2019 |
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| KeyWord:Polygonum hydropiper L.;Polygonum lapathifolium L.;Enterobacter sp. FM-1;cadmium;arsenic |
| Author Name | Affiliation | E-mail | | LI Yi | Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection, Ministry of Education, Guilin 541004, China
College of Environment and Resource, Guangxi Normal University, Guilin 541004, China | | | WANG Bing-sen | College of Environment and Resource, Guangxi Normal University, Guilin 541004, China | | | HUANG Yuan-yuan | College of Environment and Resource, Guangxi Normal University, Guilin 541004, China | | | YAO Ya-wei | College of Environment and Resource, Guangxi Normal University, Guilin 541004, China | | | LIN Jia-min | College of Environment and Resource, Guangxi Normal University, Guilin 541004, China | | | LIU Ke-hui | Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection, Ministry of Education, Guilin 541004, China
College of Life Science, Guangxi Normal University, Guilin 541004, China | | | YU Fang-ming | Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection, Ministry of Education, Guilin 541004, China
College of Environment and Resource, Guangxi Normal University, Guilin 541004, China | fmyu1215@163.com |
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| Abstract: |
| We conducted this study to investigate the effects of different Enterobacter sp. FM-1 inoculation levels on the growth, phytoremediation of cadmium and arsenic, antioxidant enzymatic system, and non-enzymatic system by Polygonaceae plants(Polygonum hydropiper L. and Polygonum lapathifolium L.)in cadmium-arsenic co-contaminated soil. The results indicated inoculation with Enterobacter sp. FM-1 promoted the growth of both plants. Furthermore, there were increased contents of chlorophyll and carotenoids in the leaves of Polygonum hydropiper L. and Polygonum lapathifolium L. Inoculation with Enterobacter sp. FM-1(3.4×107 CFU·g-1 soil)decreased rhizospheric soil pH. For both Polygonum hydropiper L. and Polygonum lapathifolium L., compared to that of the uninoculated control, the soil pH value decreased by 0.35 and 0.28, respectively. The content of cadmium and arsenic in the roots, stems, and leaves of the two plants increased 1.64~2.74 times and 1.21~2.51 times, respectively. Additionally, inoculation with Enterobacter sp. could not only increase the content of SOD, POD, and CAT in the leaves of Polygonum hydropiper L. and Polygonum lapathifolium L., but also increased the content of GSH and PCs. Moreover, the content of O2-·and MDA were effectively decreased. Our findings indicated that inoculation with Enterobacter sp. FM-1 helped plants alleviate heavy metal poisoning by increasing the activity of antioxidant enzymes. Hence, Enterobacter sp. FM-1 is potentially useful for cadmium and arsenic phytoremediation in cadmium-arsenic co-contaminated soil by Polygonum hydropiper L. and Polygonum lapathifolium L.. |
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