Journal
JOURNAL OF RARE EARTHS
Volume 36, Issue 3, Pages 331-336Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jre.2017.09.006
Keywords
Subcelluar distribution; Yttrium; Detoxicity; Tolerance; Rice; Rare earths
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Funding
- Natural Science Foundation of Shandong Province, China [ZR2014DM010, ZR2015CL009]
- National Natural Science Foundation of China [30900071]
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Yttrium (Y) accumulation in soil is a serious environment problem in China. To understand the mechanisms involved in Y tolerance and detoxification in rice seedling, the bioaccumulation, subcellular distribution, and chemical forms of Y was investigated in the present study. The results show that the content of Y both in roots and shoots increases with the increasing concentration of Y, and a large amount of Y is stored in roots. Subcellular distribution of Y in rice indicates that the majority of Y is bound to cell wall. Meanwhile, various chemical forms of Y is absorbed by rice. The greatest amount of Y is extracted by 2% hydrate acetic acid (HAc) and 0.6 mol/L HCl (particularly 2% HAc), which indicates that most of Y is combined with un-dissolved phosphate and oxalate (particularly phosphate). Cluster analysis, based on Y abundance levels, reveals the relationship between Y distribution patterns and chemical forms. Our results imply that Y forming of precipitates with phosphate (and/or oxalate) and depositing in the cell wall may be a key strategy for Y detoxicity and tolerance in rice. (C) 2018 Chinese Society of Rare Earths. Published by Elsevier B.V. All rights reserved.
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