Contrasting roles of rice root iron plaque in retention and plant uptake of silicon, phosphorus, arsenic, and selenium in diverse paddy soils

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Author(s)Linam, Franklin A.
Author(s)Limmer, Matt A.
Author(s)Seyfferth, Angelia L.
Date Accessioned2024-04-29T17:34:39Z
Date Available2024-04-29T17:34:39Z
Publication Date2024-02-20
DescriptionThis article was originally published in Plant and Soil. The version of record is available at: https://doi.org/10.1007/s11104-024-06553-6. © The Author(s) 2024.
AbstractBackground and aims Iron (Fe) plaque on rice roots is a mixture of Fe oxide and oxyhydroxide minerals thought to protect rice from high levels of arsenic (As) in flooded paddy soils. Silicon (Si), phosphorus (P), and selenium (Se) also exist as oxyanions in rice paddies, but the impacts of Fe plaque on uptake of these nutrients are unknown. Methods We used natural variation in paddy soil chemistry to test how Si, P, As, and Se move from porewater to plaque to plant via multiple techniques. In a pot study, we monitored Fe plaque deposition and porewater chemistry in 5 different soils over time and measured plaque/plant chemistry and Fe plaque mineralogy at harvest. We normalized oxyanion concentrations by Fe to determine the preferential retention on plaque or plant uptake. Results Low phosphorus availability increased root Fe-oxidizing activity, while Fe, Si, P, As, and Se concentrations in plaque were strongly correlated with porewater. Plaque did not appreciably retain Si and Se, and the oxyanions did not compete for adsorption sites on the Fe plaque. Conclusion Root Fe plaque seems to protect rice from As uptake, does not interfere with Si and Se uptake, and roots adapt to maintain P nutrition even with retention of porewater P on plaque.
SponsorThis work was funded by the United States Department of Agriculture National Institute of Food and Agriculture (Grant #2022–67011-36457). Parts of this research used beam line 7–2 at SSRL. Use of the Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Contract No. DE-AC02-76SF00515.
CitationLinam, F.A., Limmer, M.A. & Seyfferth, A.L. Contrasting roles of rice root iron plaque in retention and plant uptake of silicon, phosphorus, arsenic, and selenium in diverse paddy soils. Plant Soil (2024). https://doi.org/10.1007/s11104-024-06553-6
ISSN1573-5036
URLhttps://udspace.udel.edu/handle/19716/34322
Languageen_US
PublisherPlant and Soil
dc.rightsAttribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
Keywordssoil
Keywordsiron oxide
Keywordsoxyanion
Keywordsrice
Keywordsplaque
Keywordszero hunger
Keywordslife on land
TitleContrasting roles of rice root iron plaque in retention and plant uptake of silicon, phosphorus, arsenic, and selenium in diverse paddy soils
TypeArticle
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