Selenium uptake, differentiation and metabolism in hyperaccumulator Stanleya pinnata
Selenium (Se) is a biologically essential element for many animals, some prokaryotes and algae. However, even in organisms that require Se, the range between sufficiency and toxicity for Se is narrow. Although there are no reports of a Se requirement or selenoproteins in higher plants, there are species that appear endemic to seleniferous soil and concentrate Se in their leaves to levels exceeding 1000 mg kg-1 dry weight. These plants are known as Se hyperaccumulators and have an exceptional ability to tolerate and enrich themselves with this toxic element. As a result of the Se concentrations ...
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