Arsenic uptake and speciation in the rootless duckweed Wolffia globosa
Open accessAbstract
Duckweeds are a common macrophyte in paddy and aquatic environments. Here, we investigated arsenic (As) accumulation, speciation and tolerance of the rootless duckweed Wolffia globosa and its potential for As phytofiltration. When grown with 1 microm arsenate, W. globosa accumulated two to 10 times more As than four other duckweed or Azolla species tested. W. globosa was able to accumulate > 1000 mg As kg(-1) in frond dry weight (DW), and tolerate up to 400 mg As kg(-1) DW. At the low concentration range, uptake rate was similar for arsenate and arsenite, but at the high concentration range, arsenite was taken up at a faster rate. Arsenite was the predominant As species (c. 90% of the total extractable As) in both arsenate- and arsenite-exposed duckweed. W. globosa was more resistant to external arsenate than arsenite, but showed a similar degree of tolerance internally. W. globosa decreased arsenate in solution rapidly, but also effluxed arsenite. Wolffia globosa is a strong As accumulator and an interesting model plant to study As uptake and metabolism because of the lack of a root-to-frond translocation barrier.
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Eriophorum angustifolium hyperaccumulates As in root tissues, while in Wolffia globose, up to 400 mg kg-1 of As is accumulated.
“Eriophorum angustifolium hyperaccumulates As in root tissues, while in Wolffia globose, up to 400 mg kg–1 of As is accumulated (Stoltz and Greger, 2002; Zhang et al., 2009).”
From Plant hyperaccumulators: a state-of-the-art review on mechanism of heavy metal transport and sequestration (2025) · cites this paper as Zhang et al., 2009
The Abstract reports that W. globosa accumulates arsenic, but distinguishes accumulation of more than 1000 mg kg−1 from tolerance of up to 400 mg kg−1. The Discussion likewise identifies approximately 400 mg kg−1 as the upper limit without significant growth inhibition, not the maximum accumulated. The Eriophorum claim is paired with a different citation and is not assessed here. (LLM, conf=0.88)
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“The overexpression of NIP genes might be responsible for transporting As from roots to the xylem vessels in Pteris vitata (Zhao et al., 2009).”
Yaskolka Meir, A., Tsaban, G., Zelicha, H., Rinott, E., Kaplan, A., Youngster, I., Rudich, A., Shelef, I., Tirosh, A., Brikner, D., et al. (2019) · The Journal of Nutrition · doi:10.1093/jn/nxy321 · Cited by 47 · see citing works
- Authors
- Zhang, X., Zhao, F., Huang, Q., Williams, P. N., Sun, G., & Zhu, Y.
- Affiliations
- Chinese Academy of Sciences (CN)
- Venue
- New Phytologist
- Publisher
- Wiley
- Published
- 2009-03-27
- Volume
- 182
- Issue
- 2
- Pages
- 421-428
- ISSN
- 0028-646X (ISSN-L)
- 1469-8137
- OpenAlex
- W2102954681
- Cited by
- 121
- References
- 47
- Citations by year
- 2026: 3 · 2025: 6 · 2024: 7 · 2023: 10 · 2022: 6 · 2021: 11 · 2020: 9 · 2019: 6 · 2018: 10 · 2017: 6 · 2016: 4 · 2015: 5 · 2014: 9 · 2013: 3 · 2012: 11
- FWCI
- 6.60
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- New Phytologist (publishedVersion)
- PubMed (publishedVersion)
- Rothamsted Repository (Rothamsted Repository) (submittedVersion)
- Lancaster EPrints (Lancaster University) (submittedVersion)
- Research Center for Eco-Environmental Sciences OpenIR (Chinese Academy of Sciences) (submittedVersion, cc-by-nc-nd)
- Research Portal (Queen's University Belfast) (submittedVersion)
- Funders
- National Natural Science Foundation of China (40730740)
- Directorate for Biological Sciences
- Biotechnology and Biological Sciences Research Council
- Topics
- Physical Sciences › Environmental Science › Environmental Chemistry › Arsenic contamination and mitigation
- Physical Sciences › Environmental Science › Pollution › Heavy metals in environment
- Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Environmental Toxicology and Ecotoxicology
- Keywords
- arsenic uptake, arsenic speciation, Wolffia globosa, duckweed, arsenate, arsenite, arsenic tolerance, arsenic accumulation, arsenite efflux, arsenic metabolism, aquatic macrophytes, paddy ecosystem
- MeSH terms
- Adaptation, Physiological, Arsenates, Arsenic, Arsenites, Magnoliopsida
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