ArticleAnnals of botany2023
Differences and similarities in selenium biopathways in Astragalus, Neptunia (Fabaceae) and Stanleya (Brassicaceae) hyperaccumulators.
Article in Annals of botany, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.
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6 citing papers in PubMed, 17 citations in OpenAlex.
- An atlas of plant selenium metabolism.The New phytologist · 2026Review
- The nature of thallium crystals in Brassica oleracea (kale): a synchrotron multi-technique investigation.Metallomics : integrated biometal science · 2026Article
- Synchrotron X-ray fluorescence microscopy unveils selenium distribution and a phloem-sink hypothesis in Neptunia amplexicaulis.Plant physiology · 2025Article
- Initial shoot regeneration in the selenium hyperaccumulator Neptunia amplexicaulis and in vitro test system for selenium tolerance and accumulation.Natural products and bioprospecting · 2025Article
- Uncovering the physiology and distribution of thallium in Tl-hyperaccumulating and Tl-sensitive populations of Biscutella laevigata L.Annals of botany · 2024Article
- The curious case of selenium hyperaccumulation in Coelospermum decipiens from the Cape York Peninsula (Queensland, Australia).Annals of botany · 2024Article
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Authors and funding
7 authors at 4 institutions in 5 countries.
Funding
Abstract
BACKGROUND AND
aimsSelenium hyperaccumulator species are of primary interest for studying the evolution of hyperaccumulation and for use in biofortification because selenium is an essential element in human nutrition. In this study, we aimed to determine whether the distributions of selenium in the three most studied hyperaccumulating taxa (Astragalus bisulcatus, Stanleya pinnata and Neptunia amplexicaulis) are similar or contrasting, in order to infer the underlying physiological mechanisms.
methodsThis study used synchrotron-based micro-X-ray fluorescence (µXRF) techniques to visualize the distribution of selenium and other elements in fresh hydrated plant tissues of A. racemosus, S. pinnata and N. amplexicaulis. KEY
resultsSelenium distribution differed widely in the three species: in the leaves of A. racemosus and N. amplexicaulis selenium was mainly concentrated in the pulvini, whereas in S. pinnata it was primarilylocalized in the leaf margins. In the roots and stems of all three species, selenium was absent in xylem cells, whereas it was particularly concentrated in the pith rays of S. pinnata and in the phloem cells of A. racemosus and N. amplexicaulis.
conclusionsThis study shows that Astragalus, Stanleya and Neptunia have different selenium-handling physiologies, with different mechanisms for translocation and storage of excess selenium. Important dissimilarities among the three analysed species suggest that selenium hyperaccumulation has probably evolved multiple times over under similar environmental pressures in the US and Australia.
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