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| Screening and preliminary rhizosphere mechanisms of low Cr/Pb accumulation cultivars of Chinese flowering cabbages (Brassica parachinensis L.) |
| Received:March 10, 2016 |
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| KeyWord:Chinese flowering cabbage(Brassica parachinensis L.);lead;chromium;low accumulation;rhizosphere mechanism |
| Author Name | Affiliation | E-mail | | CHEN Hui-jun | School of Environment, Jinan University, Key Laboratory of Environmental Exposure and Health of Guangzhou City, Guangzhou 510632, China
Guangdong provincial research center of environmental pollution control and remediation material, Guangzhou 510632, China | | | TAN Ling | School of Environment, Jinan University, Key Laboratory of Environmental Exposure and Health of Guangzhou City, Guangzhou 510632, China
Guangdong provincial research center of environmental pollution control and remediation material, Guangzhou 510632, China | | | LI Qu-sheng | School of Environment, Jinan University, Key Laboratory of Environmental Exposure and Health of Guangzhou City, Guangzhou 510632, China
Guangdong provincial research center of environmental pollution control and remediation material, Guangzhou 510632, China | liqusheng@21.com | | LUO Tao | School of Environment, Jinan University, Key Laboratory of Environmental Exposure and Health of Guangzhou City, Guangzhou 510632, China
Guangdong provincial research center of environmental pollution control and remediation material, Guangzhou 510632, China | | | FANG Hao | School of Environment, Jinan University, Key Laboratory of Environmental Exposure and Health of Guangzhou City, Guangzhou 510632, China
Guangdong provincial research center of environmental pollution control and remediation material, Guangzhou 510632, China | | | YU Dan-ping | School of Environment, Jinan University, Key Laboratory of Environmental Exposure and Health of Guangzhou City, Guangzhou 510632, China
Guangdong provincial research center of environmental pollution control and remediation material, Guangzhou 510632, China | | | HU Ni | School of Environment, Jinan University, Key Laboratory of Environmental Exposure and Health of Guangzhou City, Guangzhou 510632, China
Guangdong provincial research center of environmental pollution control and remediation material, Guangzhou 510632, China | | | YANG Yao-shuai | School of Environment, Jinan University, Key Laboratory of Environmental Exposure and Health of Guangzhou City, Guangzhou 510632, China
Guangdong provincial research center of environmental pollution control and remediation material, Guangzhou 510632, China | |
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| Abstract: |
| A pot experiment was carried out to select relatively high Cr/Pb accumulating cultivars (HC) and relatively low Cr/Pb accumulating cultivars (LC) from 37 cultivars of Chinese Flowering Cabbages (Brassica parachinensis L.). A hydroponic experiment and an experiment by Ca ion channel blocker were performed on the selected HC and LC cultivarto investigate the mechanism of Cr/Pb uptake and mobilization by roots of LC cultivars. Two HC cultivars (Tejichutiao and Youqingsijiu) and two LC cultivars (Lvxing and Jiping) were selected out. Cr and Pb concentrations in rhizosphere soil solution of LC cultivars are significantly lower than those of HC cultivar, but were not significantly differ ent to those of bulk soil solution. Meanwhile, the concentrations of dissolved organic carbon (DOC) in the rhizosphere of LC cultivars were ob viously lower than that of HC cultivars. The pH values in the rhizosphere of LC cultivars were also higher than those of HC cultivars. These results indicated a lower mobilization of Cd/Pb in the rhizophsere of LC cultivars. Ca ion channel blocker significantly inhibited Cr, Pb and Ca uptake by roots (P<0.05), which suggested that Cr and Pb might be absorbed by cabbage roots via Ca ion channel, although these metals might also be absorbed through Fe and/or K pathway. The less Ca uptake possibly meant inactive Ca ion channel in roots of LC cultivar, resulting less Cr and Pb uptake through Ca pathway. The translocation of Cr and Pb from roots to edible parts of cabbage has no significant (P<0.05) effect on Cr and Pb accumulation in edible parts of cabbage. In conclusion, less DOC and H+ secreted by roots, and inactive Ca ion channels may result in lower Cr and Pb uptake and accumulation in Chinese flowering cabbages. |
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