Can phosphate compounds be used to reduce the plant uptake of Pb and resist the Pb stress in Pb-contaminated soils? |
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作者姓名: | CHEN Shibao CHEN Li MA Yibing HUANG Yizong |
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作者单位: | CHEN Shibao,MA Yibing(Ministry of Agriculture Key Laboratory of Plant Nutrition and Nutrient Cycling, and Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China);CHEN Li(Institute of Plant Protection and Environmental Protection, Beijing Academy of Agricultural and Forestry Science, Beijing 100097, China);HUANG Yizong(Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China)
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基金项目: | 国家高技术研究发展计划(863计划),the special fund for the institute of commonweal scientific research in China |
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摘 要: | The effects of di erent phosphate-amendments on lead (Pb) uptake, the activities of superoxide dismutase (SOD) and the level
of malondialdehyde (MDA) in cauliflower (Brassica oleracea L.) in contaminated soils with 2500, or 5000 mg P2O5/kg soil of
hydroxyapatite (HA), phosphate rock (PR), single-superphosphate (SSP) and the mix of HA/SSP (HASSP) were evaluated in pot
experiments. Results showed that the Pb concentrations in shoots and roots decreased by 18.3%–51.6% and 16.8%–57.3% among the
treatments respectively compared to the control samples. The e ciency order of these phosphate-amendments in reducing Pb uptake
was as follows: HASSPt HA > SSP t PR.With the addition of SSP, HA and the mix of HA/SSP, the SOD activity in shoot was reduced
markedly (P < 0.05) compared with that in the control group. For example, the SOD activities in shoot by the treatments of HASSP,
SSP, and HA in 5000 mg P2O5/kg were found to be only 51.3%, 56.2%, and 56.7%, respectively. Similar e ects were also observed on
the level of MDA in the shoots with a decrease in 24.5%–56.3%. The results verified the inference that phosphate compounds could be
used to reduce the plant uptake of Pb and resist the Pb stress in the plant vegetated in Pb-contaminated soils.
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关 键 词: | 植物吸收 污染土壤 铅污染 磷酸盐 铅胁迫 化合物 超氧化物歧化酶活性 过磷酸钙 |
收稿时间: | 21 April 2008 |
修稿时间: | 8/6/2008 12:00:00 AM |
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