Hyperaccumulators of metal and metalloid trace elements: Facts and fiction

Hyperaccumulators of metal and metalloid trace elements: Facts and fiction

22 May 2012 | Antony van der Ent, Alan J. M. Baker, Roger D. Reeves, A. Joseph Pollard, Henk Schat
The article "Hyperaccumulators of metal and metalloid trace elements: Facts and fiction" by Antony van der Ent, Alan J. M. Baker, Roger D. Reeves, A. Joseph Pollard, and Henk Schat, published in 2012, reviews the concept of hyperaccumulation in plants. Hyperaccumulation refers to the ability of certain plants to accumulate metal and metalloid trace elements to extremely high concentrations in their living biomass. The term was coined by Reeves in 1976 to describe the high nickel accumulation in *Sebertia acuminata* (now *Pycnanandra acuminata*). The authors provide a detailed definition of hyperaccumulation, emphasizing that it should be based on measurements of above-ground tissue, specifically leaves, and that the accumulation must occur in the plant's natural habitat while maintaining health. The article discusses the criteria for hyperaccumulation, such as a concentration of at least 1,000 μg/g in dry matter of above-ground tissue, and notes that this criterion is set at the organ level, not at the tissue or organelle level. It also addresses the distinction between active and passive accumulation, where passive accumulation via air-borne deposition is not considered hyperaccumulation. The scope of hyperaccumulation has expanded to include other elements like zinc, cadmium, manganese, arsenic, and selenium, with varying accumulation thresholds. The authors highlight the need for standardized terminology and methods to ensure unambiguous communication and reliable analytical data in the field of hyperaccumulation research. They conclude by emphasizing the importance of maintaining healthy plants while achieving high metal concentrations, which is crucial for phytoremediation applications.The article "Hyperaccumulators of metal and metalloid trace elements: Facts and fiction" by Antony van der Ent, Alan J. M. Baker, Roger D. Reeves, A. Joseph Pollard, and Henk Schat, published in 2012, reviews the concept of hyperaccumulation in plants. Hyperaccumulation refers to the ability of certain plants to accumulate metal and metalloid trace elements to extremely high concentrations in their living biomass. The term was coined by Reeves in 1976 to describe the high nickel accumulation in *Sebertia acuminata* (now *Pycnanandra acuminata*). The authors provide a detailed definition of hyperaccumulation, emphasizing that it should be based on measurements of above-ground tissue, specifically leaves, and that the accumulation must occur in the plant's natural habitat while maintaining health. The article discusses the criteria for hyperaccumulation, such as a concentration of at least 1,000 μg/g in dry matter of above-ground tissue, and notes that this criterion is set at the organ level, not at the tissue or organelle level. It also addresses the distinction between active and passive accumulation, where passive accumulation via air-borne deposition is not considered hyperaccumulation. The scope of hyperaccumulation has expanded to include other elements like zinc, cadmium, manganese, arsenic, and selenium, with varying accumulation thresholds. The authors highlight the need for standardized terminology and methods to ensure unambiguous communication and reliable analytical data in the field of hyperaccumulation research. They conclude by emphasizing the importance of maintaining healthy plants while achieving high metal concentrations, which is crucial for phytoremediation applications.
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