Screening ornamental plants to identify potential Cd hyperaccumulators for bioremediation

Wu, Manxia; Luo, Qiao; Liu, Shiliang; Zhao, Yin; Lei, Yang; Pan, Yuanzhi

doi:10.1016/j.ecoenv.2018.06.049

Cited by 100 publications

(36 citation statements)

References 39 publications

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“…Therefore, we screened a large panel of 49 fern species, all hardy and ornamental ferns, on a substrate spiked with six REEs (La, Ce, Sm, Gd, Yb and Y). The screening of hardy and ornamental plants has several advantages (Wu et al 2018). For example, the use of non-edible plants restricts their entry into the food chain (Liu et al 2008;Jelusic and Lestan 2015;Wu et al 2018).…”

Section: Discussionmentioning

confidence: 99%

“…The identification of new fern species that are able to accumulate REEs is of great interest, as it will allow for the selection of appropriate species adapted to a prospected area (soil, climatic conditions), for the determination of their use in environmental restoration and for the purpose of phytoextraction. Plant screening for new metal-accumulating species has already been done for several metals, including Cr (Shahandeh and Hossner 2000), As (Zhang et al 2014), Pb (Salazar and Pignata 2014) and Cd (Wu et al 2018). To identify new species that accumulate REEs and also to determine if this trait is conserved among certain genera, we have carried out a screening of fern species to determine their potential for REE accumulation.…”

Section: Introductionmentioning

confidence: 99%

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Identification of new hardy ferns that preferentially accumulate light rare earth elements: a conserved trait within fern species

et al. 2020

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Environmental contextRare earth elements (REEs) are strategic metals and emerging contaminants for which plant-based remediation measures are needed. We screened a collection of hardy ferns and identified new accumulator species that preferentially transferred light REEs to their fronds. This study is an important step towards understanding the mechanisms of REE accumulation in plants. AbstractRare earth elements (REEs) include the lanthanides plus yttrium and scandium, and can be split according to their atomic mass into light (LREEs) and heavy REEs (HREEs). The increasing demand for REEs is mainly driven by new technologies, and their current low recyclability has led them to become emerging contaminants. The identification of new REE accumulators may help in determining the REE transfer mechanisms and may result in interesting candidates for phytoremediation techniques. To that end, a collection of 49 hardy fern species, grown in REE-spiked substrate, were screened for their potential in REE accumulation. REE concentrations were very low in the fronds of all Polypodium species, whereas all Athyrium species highly accumulated REEs. The REE accumulation level was more variable among the different species of Dryopteris, Blechnum, Woodwardia, Cystopteris and Polystichum. However, whatever the species, LREEs were preferentially transferred to the fronds over HREEs. This conserved trait was independent of the availability of different REEs in the substrate and instead may arise from specific transfer systems in ferns for the two groups of REEs. Furthermore, REE accumulation was correlated to Ca and Al, which suggested the existence of common uptake pathways. Altogether, these results are of great interest for phytoremediation purposes since appropriate species can be chosen according to the area to be remediated, and they also provide new insights into a more in-depth characterisation of the underlying REE accumulation mechanisms in ferns.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Identification of new hardy ferns that preferentially accumulate light rare earth elements: a conserved trait within fern species

et al. 2020

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“…The bioconcentration factor (BCF) indicates the efficacy of the plant to accumulate the pollutant in its tissues. The BCF is calculated as the ratio of concentration of the pollutant in the harvested plant to that of the soil [25,26]. The translocation factor represents the plant's ability to translocate the pollutant from the roots to the aerial parts of the plant; it is calculated as the ratio of the concentration of the pollutant in the aerial parts of the plant to the root concentration [26,27].…”

Section: Introductionmentioning

confidence: 99%

“…There are reports of over 400 species of hyperaccumulators, though many of these, such as the well-known Cd hyperaccumulator Thlaspi caerulescens, have low biomass or are slow growing [6,22]. Cadmium hyperaccumulators must be capable of accumulating 100 mg/kg of Cd in its shoots, which is approximately 100 times the level of Cd that would be found in the tissues of a non-hyperaccumulator species [21,[24][25][26]. Hyperaccumulators should also have a bioconcentration factor and a translocation factor with values greater than unity.…”

Section: Introductionmentioning

confidence: 99%

“…Many of the most effective hyperaccumulators are food crops-for example, Brassica juncea, Helianthus annuus, and Z. mays [26]. However, some ornamental species have been identified as promising sources of new potential phytoremediators [24,25]. For example, recent research has highlighted I. walleriana, the common busy lizzie, as a promising hyperaccumulator of Cd, capable of tolerating up to 120 mg/kg of Cd [20,31,32].…”

Section: Introductionmentioning

confidence: 99%

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Cadmium Hyperaccumulation and Translocation in Impatiens Glandulifera: From Foe to Friend?

et al. 2019

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The use of phytoremediation to sustainably recover areas contaminated by toxic heavy metals such as cadmium (Cd) has been made feasible since the discovery of hyperaccumulator plants. This study examines the potential of the invasive Impatiens glandulifera for phytoremediation propensity of Cd. In these experiments, the plants were exposed to and tested for Cd accumulation; the propensity to accumulate other heavy metals, such as Zinc, was not investigated. The efficacy of phytoaccumulation was assessed over two trials (Cd concentrations of 20 mg/kg to 150 mg/kg) via examination of bioconcentration factor (BCF), translocation factor (TF), and total removal (TR). Exposure to Cd levels of up to 150 mg/kg in the trials did not affect the biomass of the plants compared to the control. Impatiens glandulifera accumulated cadmium at a rate of 276 to 1562 mg/kgin stems, with BCFs, TFs, and TRs of 64.6 to 236.4, 0.2 to 1.2, and 3.6 to 29.2 mg Cd, respectively. In vitro germination revealed unprecedented germination ability, demonstrating the remarkable hypertolerance of I. glandulifera, with no significant difference in the germination of seedlings exposed to 1000 mg/kg Cd compared to the control. This study also examined the localization of Cd in plant tissues via a histochemical assay using dithizone. The results presented herein suggest that I. glandulifera can act as a hyperaccumulator of Cd for phytoremediation.

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Environmental risk due to the accumulation of metals in Sedum alfredii under different intercropping patterns during phytoremediation

Ning

Jia

et al. 2022

Land Degrad Dev

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A field experiment was conducted to evaluate the environmental risk of phytoextraction of Cd, Cu, and Pb using Sedum alfredii Hance. with different intercropping patterns. Three receptors representing invertebrates (earthworms), avians (yellow‐feathered chickens), and small mammalian omnivores (Rattus losea) were selected as the potentially impacted environmental receptors. Soil deglutition and food ingestion are considered dominant pathways of metal exposure. Different planting patterns, including S. alfredii monoculture and S. alfredii intercropped (coordinate and malposed) with Cicer arietinum L., were used to evaluate the mobilization, absorption, and migration of Cd during phytoextraction. This study revealed that the intercropping systems, particularly the malposed intercropping patterns, significantly increased the Cd decontamination efficiency by 31.3% and enhanced the content of Cu and Pb in the aboveground tissues of the intercropped C. arietinum. Correspondingly, different planting patterns resulted in varying environmental risks. For the omnivores, which primarily consume earthworms and plant tissues, the hazard index was 0.096 for the S. alfredii monoculture, and the index decreased to 0.074 and 0.090 in the coordinate and malposed intercropping patterns, respectively. The environmental risk might be induced by the increased Cd concentrations in the roots and shoots of S. alfredii. When extrapolating the results of this treatment to the entire region, all the environmental hazard index values of the receptors were higher than 1.0. This study suggests that if a phytoextraction method is used for metal decontamination, corresponding prevention strategies should be established to prevent the diffusion of concentrated metals to higher trophic levels via the food chain.

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Screening ornamental plants to identify potential Cd hyperaccumulators for bioremediation

Cited by 100 publications

References 39 publications

Identification of new hardy ferns that preferentially accumulate light rare earth elements: a conserved trait within fern species

Identification of new hardy ferns that preferentially accumulate light rare earth elements: a conserved trait within fern species

Cadmium Hyperaccumulation and Translocation in Impatiens Glandulifera: From Foe to Friend?

Environmental risk due to the accumulation of metals in Sedum alfredii under different intercropping patterns during phytoremediation

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