Abstract

To assess the cadmium (Cd) phytoremediation of three native plant species from Padeang zinc (Zn) mine area (Chromolaena odorata, Impatiens patula, and Gynura pseudochina), a hydroponic experiment was performed in nutrient solutions containing various concentrations of Cd (0, 5, 10, 20, and 50 mg L⁻¹) for 15 days. In the hydroponic experiment, C. odorata showed significantly higher total Cd content than those grown in 50 mg L⁻¹ Cd solutions. Only C. odorata and I. patula were chosen for the pot experiment. The plants were grown in spiked Cd-contaminated soils for 90 days, with different concentrations of Cd (0, 20, 40, 60, and 80 mg kg⁻¹). The results from the pot experiment revealed that both species accumulated more Cd in their root parts, with translocation factor values < 1. C. odorata exhibited the highest biomass production, relative growth rate, and Cd uptake or removal. The findings of the study clearly demonstrate the best uptake of C. odorata in Cd phytoremediation.

Novelty statement

Even though Chromolaena odorata, Impatiens patula, and Gynura pseudochina have been reported as a Cd accumulator but the assessment of these species by nutrient medium and the soil was not undertaken so far. The discovery of new Cd-accumulator plants has been hindered by the lack of efficient assessing. To assess the suitability of specific species of tropical plants that are able to uptake high amounts of Cd without risk of toxicity under conditions similar to the actual field study, is a novelty.

摘要

为了评估来自 Padeang 锌 (Zn) 矿区的三种本地植物物种 ( Chromolaena odorata、Impatiens patula和Gynura pseudochina )的镉 (Cd) 植物修复，在含有不同浓度 Cd (0, 5 、10、20 和 50 mg L ^-1 )，持续 15 天。在水培实验中，C. odorata显示出比在 50 mg L ^-1 Cd 溶液中生长的那些显着更高的总 Cd 含量。只有C. odorata和I. patula被选为盆栽实验。植物在掺有 Cd 的土壤中生长 90 天，具有不同的 Cd 浓度（0、20、40、60 和 80 mg kg ^-1）。盆栽实验的结果表明，这两个物种在其根部积累了更多的 Cd，易位因子值 < 1。C. odorata表现出最高的生物量产量、相对生长率和 Cd 吸收或去除。该研究的结果清楚地证明了Cd 植物修复中C. odorata的最佳吸收。

新颖性声明

尽管Chromolaena odorata、Impatiens patula 和 Gynura pseudochina已被报告为 Cd 蓄积者，但到目前为止还没有通过营养培养基和土壤对这些物种进行评估。由于缺乏有效的评估，新的镉积累植物的发现受到了阻碍。在与实际田间研究相似的条件下，评估能够吸收大量 Cd 而没有毒性风险的特定热带植物物种的适用性，是一个新奇事物。