Identification of a new potential Cd-hyperaccumulator Solanum photeinocarpum by soil seed bank-metal concentration gradient method.
Identification of a new potential Cd-hyperaccumulator Solanum photeinocarpum by soil seed bank-metal concentration gradient method.
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DOI：
10.1016/j.jhazmat.2011.02.053
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发表时间：
2011-05
影响因子：
13.6
通讯作者：
Xingfeng Zhang;H. Xia;Zhian Li;Zhuang Ping;Bo Gao
中科院分区：
文献类型：
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作者：
Xingfeng Zhang;H. Xia;Zhian Li;Zhuang Ping;Bo Gao
采用土壤种子库-金属浓度梯度法对重金属超富集植物进行筛选，发现龙葵是一种潜在的镉超富集植物。叶绿素含量和光合速率均高于对照。结果表明，Cd污染对光果类植物的叶片气孔和蒸腾速率无明显影响，但Cd浓度超过60 mgkg-1Cd时，叶片气孔和蒸腾速率显著降低，叶片水分利用效率和地上部含水量显著提高。在种子库-Cd浓度梯度实验中，S.当土壤Cd浓度达到100 mgkg-1时，紫珠的根系生物量没有显著降低，但当Cd浓度超过60 mgkg-1时，紫珠的根系生物量显著降低。在土壤中100 mgkg − 1Cd时，植物组织在根、茎和叶中分别积累544、132和158 mgkg − 1Cd，在根和地上部中分别提取157和195μ gCd。在移栽-Cd浓度梯度试验中，当土壤Cd浓度高达60 mgkg-1时，植株地上部生物量和根系生物量不受影响。在60 mgkg-1土壤Cd处理下，植物组织在根、茎和叶中分别积累了473、215和251 mgkg-1 Cd，在根和地上部中分别提取了176和787μ gCd。土壤种子库-金属浓度梯度法是筛选金丝桃属植物的有效方法。
A new method, soil seed bank-metal concentration gradient method was used to screen for heavy metal hyperaccumulators, and Solanum photeinocarpum was found to be a potential Cd-hyperaccumulator. The chlorophyll content and photosynthetic rate of S. photeinocarpum were not affected by Cd pollution, while leaf stomas and transpiration rate were significantly decreased by more than 60mgkg−1Cd, and leaf water use efficiency and shoot water content were significantly increased by more than 60 or 100mgkg−1Cd, respectively. In the seed bank-Cd concentration gradient experiment, the shoot biomass of S. photeinocarpum showed no significant reduction with soil Cd treatment as high as 100mgkg−1, but the root biomass was significantly reduced by more than 60mgkg−1Cd contamination. Plant tissues accumulated 544, 132 and 158mgkg−1Cd in roots, stems and leaves, respectively, and extracted 157 and 195μg Cdplant−1in roots and shoots at 100mgkg−1Cd in soil, respectively. In the transplanting-Cd concentration gradient experiment, plant shoot biomass and root biomass were unaffected by soil Cd as high as 60mgkg−1. Plant tissues accumulated 473, 215 and 251mgkg−1Cd in roots, stems and leaves, respectively, and extracted 176 and 787μg Cdplant−1in roots and shoots at 60mgkg−1soil Cd, respectively. Soil seed bank-metal concentration gradient method could be an effective method for the screening of hyperaccumulators.