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| Physiological responses and lead accumulation of the winter weed Capsella bursa-pastoris under lead stress |
| Received:June 24, 2015 |
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| KeyWord:Capsella bursa-pastoris(L.) Medic;lead;accumulation;physiological response;phytoremediation |
| Author Name | Affiliation | E-mail | | LIU Ying-jie | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China
Chengdu Environmental Monitoring Center, Chengdu 610072, China
Tianfu New Area Chengdu Management Committee Economic Development Board, Chengdu 610213, China | | | ZHU Xue-mei | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | | | LIN Li-jin | Institute of Pomology and Olericulture, Sichuan Agricultural University, Chengdu 611130, China | | | YANG Yuan-xiang | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | | | YANG Zhan-biao | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | | | SHAO Ji-rong | College of Life Science, Sichuan Agricultural University, Ya'an 625014, China | shaojr007@163.com |
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| Abstract: |
| A pot experiment was conducted to examine the growth, physiological responses and lead(Pb) accumulation of Capsella bursa-pastoris(L.) Medic, a new Pb hyperaccumulator, under different Pb rates(0, 200, 400, 600, 800, 1000, 1200, 1400, and 1600 mg·kg-1). Results showed that C. bursa-pastoris grew normally and showed no toxic symptoms under all Pb treatments. With the increase of Pb concentrations in soil, plant height, root length, leaf length, chlorophyll a, chlorophyll b, chlorophyll a+b and plant biomass all showed increases at low Pb but decreases at high Pb rates, with all higher in the treatments than in the control. Lead content in and Pb extraction by roots and shoots, and bioconcentration factor and translocation factor of C. bursa-pastoris all increased with increasing Pb concentrations in soil. The Pb content in shoots and roots of C. bursa-pastoris exceeded 1000 mg·kg-1 at 1000 mg·kg-1 of soil Pb, reaching 1 036.1 mg·kg-1 and 1 201.4 mg·kg-1, respectively. The shoot bioconcentration factor of C. bursa-pastoris was greater than 1 when soil Pb concentration was higher than 600 mg·kg-1, but the translocation factor of C. bursa-pastoris was less than 1 under all Pb treatments. Activities of superoxide dismutase and catalase increased with increases in soil Cd concentration, but malondialdehyde and active oxygen radical content kept in a stable status. Therefore, C. bursa-pastoris is a Pb-accumulator with great accumulation ability, stable translocation and strong tolerance to Pb. which could be used to remediate Pb-contaminated farmland soil. |
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