Multidisciplinary Institute of Plant Biology, Pollution and Bioindicator Section, Faculty of Physical and Natural Sciences, National University of Córdoba, Av. Vélez Sársfield 1611, X5016CGA Córdoba, Argentina.
Multidisciplinary Institute of Plant Biology, Pollution and Bioindicator Section, Faculty of Physical and Natural Sciences, National University of Córdoba, Av. Vélez Sársfield 1611, X5016CGA Córdoba, Argentina.
Chemosphere. 2021 Apr;269:128732. doi: 10.1016/j.chemosphere.2020.128732. Epub 2020 Oct 28.
Phytoremediation, especially phytoextraction, is a good alternative for remediation of soils contaminated with heavy metals. This method requires selection of species for their tolerance, high accumulation levels in harvestable parts, and high biomass production. Bidens pilosa L. has been reported as tolerant to and potentially hyperaccumulator of several heavy metals, including Pb, but with variable results in terms of effectiveness. The aim of this study was to analyse the intra- and interpopulation variability of B. pilosa in response to Pb in individuals from two populations: one historically exposed to Pb and another with no history of exposure. Bidens pilosa L. presented tolerance to Pb pollution in soil, evidenced in a higher survival rate, a better antioxidant response, and an efficient reduction in cell membrane damage mainly due to history of exposure. The period of exposure (30 years) was not long enough to obtain a B. pilosa population that provides seeds for phytoextraction projects, since the average value of total extraction was relatively low. Collecting seeds from a historically exposed population will provide some suitable individuals with Pb accumulation and translocation capabilities, but not a sufficient amount to conduct a large phytoremediation project. The individual accumulator profile of B. pilosa is not related to the physiological behaviour or to the Pb entry into the vascular bundle in root, but to the incorporation of other heavy metals that are micronutrients.
植物修复，特别是植物提取，是修复重金属污染土壤的一种很好的替代方法。这种方法需要选择对重金属具有耐受性、可在可收获部分中高度积累且生物量产量高的物种。鬼针草已被报道为耐受和潜在的几种重金属，包括 Pb 的超积累者，但在有效性方面的结果各不相同。本研究的目的是分析来自两个种群的个体对 Pb 的响应中的种内和种间变异：一个种群历史上暴露于 Pb，另一个种群没有 Pb 暴露史。鬼针草对土壤中的 Pb 污染具有耐受性，这表现在更高的存活率、更好的抗氧化反应以及有效减少细胞膜损伤，这主要归因于暴露史。暴露期（30 年）不够长，无法获得用于植物提取项目的鬼针草种群，因为总提取的平均值相对较低。从历史上暴露的种群中收集种子将提供一些具有 Pb 积累和转运能力的合适个体，但不足以进行大型的植物修复项目。鬼针草的个体积累者特征与生理行为或根中 Pb 进入维管束无关，而是与作为微量元素的其他重金属的结合有关。
