Rare earth elements in plants

Kovarikova, M.; Tomášková, Ivana; Soudek, Petr

doi:10.32615/bp.2019.003

Cited by 71 publications

(51 citation statements)

References 102 publications

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“…Major reviews concerning adverse effects on soil organisms include those of Hu, Shen, and Zhao (2006), Redling (2006), El-Ramady (2010), Rim (2016), Kovaříková, Tomášková, and Soudek (2019), and Agathokleous, Kitao, and Calabrese (2019). Examples of adverse effects for major classes of organisms are given in Appendix 3.…”

Section: Examples Of Lanthanide Effects On Organisms Exposed In Soilsmentioning

confidence: 99%

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Hypothetical Soil Thresholds for Biological Effects of Rare Earth Elements

Bengtsson¹

2021

JAS

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Objectives: Anthropogenic exposures to rare earth elements are poorly known and there is limited information on their toxicity and ecotoxicity. At the same time, world production of rare earth elements has doubled every 15 years over the last half-century, and high environmental concentrations of gadolinium and lanthanum have already been found. The current review aims to give some estimates of overall exposures and an initial in-depth appraisal of thresholds for effects on agricultural soil. The results are envisaged to be used in initial assessments of agricultural soil where the natural concentrations have been anthropogenically enhanced. Methods: An extensive review has been made of available scientific literature. Criteria have been established for the selection and analysis of eligible research. For instance, only effects on soils with vegetation have been included in the assessment of biological effects. A species sensitivity distribution based on 25% inhibition of organism functions has been used to establish thresholds for effects on soil organisms. Results: Around the year 2000, mean anthropogenic contributions of lanthanides in European soil regions were at most a few per cent of the total soil content. Since then, they should have increased considerably. The proposed hypothetical threshold for agricultural soils is 1125 mg total rare earth element per kg of soil. This threshold is about 8 times the natural soil concentration. Conclusions: If this result holds up to scrutiny, it implies that general anthropogenic pollution by rare earth elements will not be a threat to agricultural sustainability for the coming generation. A preliminary assessment suggests that this threshold would also protect humans from adverse effects due to secondary exposure.

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Section: Examples Of Lanthanide Effects On Organisms Exposed In Soilsmentioning

confidence: 99%

“…Thus, aberrations might above all be found for Ce (Wyttenbach, Furrer, Schleppi, & Tobler, 1998). Factors influencing the Ce and Eu anomalies have been discussed by Kovaříková, Tomášková, and Soudek (2019).…”

Section: A231 Aberrations For Ce Eu and Ybmentioning

confidence: 99%

Hypothetical Soil Thresholds for Biological Effects of Rare Earth Elements

Bengtsson¹

2021

JAS

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“…However, higher doses of La may unbalance cell homeostasis by causing damage in the external membrane of the chloroplast, decreasing the concentrations of mineral nutrients in this organelle, especially those of P, Mg, K, Ca, Mn, Fe, Ni, Cu, Zn, and Mo, and disrupting Chl biosynthesis, which lead to a drastic reduction in photosynthesis, and cause lower growth or even negative impacts on plant performance (Hu et al 2016b). Additionally, REEs promoted the biosynthesis of the secondary metabolites, such as flavonoids, isoflavones, sesquiterpenoids, and benzyl ethanol glycosides in medicinal plant cells (Yuan et al 2002, Ouyang et al 2003, Huang 2006, Zhou et al 2010, Zhou et al 2012, Kovaříková et al 2019. Yuan et al (1993) found that 20 mg[La(NO3)3] kg -1 promoted the accumulation of alkaloids of Catharanthus roseus in cell cultures.…”

Section: La Increases Corm Yield and Kgmmentioning

confidence: 99%

Lanthanum chloride enhances the photosynthetic characteristics and increases konjac glucomannan contents in Amorphophallus sinensis Belval

Li¹,

Yu²,

Dong³

et al. 2020

Photosynt.

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Lanthanum (La) has been used as agricultural inputs in order to enhance yield and improve crop quality. However, little is known about the effect of La on the photosynthesis and growth of Amorphophallus sinensis, a worldwide food source. The effects of La on the photosynthetic and chlorophyll fluorescence parameters, photosynthetic pigments, corm yield, and konjac glucomannan (KGM) of Amorphophallus sinensis were investigated via field experiments. The leaves were sprayed with different concentrations of LaCl3 (20, 80, 160, and 240 mg L-1). The results exhibited an increasing effect of LaCl3 on photosynthetic rate, stomatal conductance, intercellular CO2 concentration, chlorophyll fluorescence parameters, photosynthetic pigments, corm yield, and KGM, when concentration was between 20 and 240 mg L-1 , and the most effective concentration was 160 mg L-1. Therefore, moderate LaCl3 concentration may increase yield of Amorphophallus sinensis by enhancing the photosynthetic efficiency, increasing the corm yield, and KGM contents.

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“…Beneficial effects in plants have occasionally been reported for different elements with either a single +3-oxidation state, such as Al and lanthanum (La), or with multiple valences, including +3, like Cr, Ti, V, and certain rare earth elements [15,16,17,18]. However, there is no evidence for the direct metabolic functions of these elements.…”

Section: Trivalent (+3) Elements: Essentiality Beneficial Effectsmentioning

confidence: 99%

How Plants Handle Trivalent (+3) Elements

Poschenrieder

Busoms

Barceló

2019

IJMS

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Plant development and fitness largely depend on the adequate availability of mineral elements in the soil. Most essential nutrients are available and can be membrane transported either as mono or divalent cations or as mono- or divalent anions. Trivalent cations are highly toxic to membranes, and plants have evolved different mechanisms to handle +3 elements in a safe way. The essential functional role of a few metal ions, with the possibility to gain a trivalent state, mainly resides in the ion’s redox activity; examples are iron (Fe) and manganese. Among the required nutrients, the only element with +3 as a unique oxidation state is the non-metal, boron. However, plants also can take up non-essential trivalent elements that occur in biologically relevant concentrations in soils. Examples are, among others, aluminum (Al), chromium (Cr), arsenic (As), and antimony (Sb). Plants have evolved different mechanisms to take up and tolerate these potentially toxic elements. This review considers recent studies describing the transporters, and specific and unspecific channels in different cell compartments and tissues, thereby providing a global vision of trivalent element homeostasis in plants.

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Rare earth elements in plants

Cited by 71 publications

References 102 publications

Hypothetical Soil Thresholds for Biological Effects of Rare Earth Elements

Hypothetical Soil Thresholds for Biological Effects of Rare Earth Elements

Lanthanum chloride enhances the photosynthetic characteristics and increases konjac glucomannan contents in Amorphophallus sinensis Belval

How Plants Handle Trivalent (+3) Elements

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