Screening ornamental plants to identify potential Cd hyperaccumulators for bioremediation
Screening ornamental plants to identify potential Cd hyperaccumulators for bioremediation
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筛选观赏植物以确定用于生物修复的潜在镉超富集植物
DOI：
10.1016/j.ecoenv.2018.06.049
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发表时间：
2018-10-30
影响因子：
6.8
通讯作者：
Pan, Yuanzhi
中科院分区：
文献类型：
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作者：
Wu, Mengxi;Luo, Qiao;Pan, Yuanzhi
为了鉴定观赏植物中可能存在的镉（Cd）蓄积体或超蓄积体，对7种观赏植物进行了增加镉浓度（0、5、15、30、60和100 mg kg(-1)）的盆栽试验。主要目的是筛选具有非凡的Cd离子积累和转运能力以及足够的生物量用于收获的观赏植物。在茎部生物量、根生物量、株高和耐性指数（TI）方面，圆叶锦葵对Cd的耐受性较高，对crisva、Sida rhombiolia、Celosia argentea和Celosia cristata的耐受性中等；玫瑰杜鹃花和苘麻对Cd的敏感性高于其他植物。Cd对crispa、C. aggentea、C. cristata和M. rotundifolia均有诱导效应。根据Cd积累能力、生物积累系数（BCFs）和转运因子（TFs），从暴露于Cd污染土壤60天后的候选植物中选择了圆叶菊，发现其根累积Cd超过200 mg kg(-1)，茎累积Cd超过900 mg kg（-1）。圆叶毛茛的BCFs和TFs均大于1.0，前者在1.41 ~ 3.31之间，后者在1.03 ~ 7.37之间。综上所述，这些结果表明，圆叶草可以归类为典型的超积累植物。
To identify possible cadmium (Cd) accumulators or hyperaccumulators among ornamental plants, a pot experiment involving increasing Cd concentration (0, 5, 15, 30, 60, and 100 mg kg(-1)) was conducted among seven species. The principal objective was to screen for ornamental plants with an exceptional ability to accumulate and translocate Cd ions as well as sufficient biomass for harvesting. Regarding shoot biomass, root biomass, plant height and tolerance index (TI), Malva rotundifolia showed high tolerance to Cd and Malva crispa, Sida rhombifolia, Celosia argentea and Celosia cristata medium tolerance; Althaea rosea and Abutilon theophrasti were more sensitive to Cd than the other plants. A hormetic response was induced by Cd in M. crispa, C. argentea, C. cristata and M. rotundifolia. Based on its capacity for Cd accumulation, bioaccumulation coefficients (BCFs) and translocation factors (TFs), M. rotundifolia was selected from candidate plants after 60 days of exposure to Cd-contaminated soil and found to have accumulated more than 200 mg kg(-1) Cd in its roots and 900 mg kg(-1) in its shoots. Moreover, M. rotundifolia BCFs and TFs were higher than 1.0, with the former ranging from 1.41 to 3.31 and the latter from 1.03 to 7.37. Taken together, these results indicate that M rotundifolia can be classified as a model hyperaccumulator.