Bioaccumulation, subcellular distribution and chemical forms of yttrium in rice seedling

• Published in: Journal of rare earths Vol. 36; no. 3; pp. 331 - 336
• Main Authors: Zheng, Shengnan, Zhang, Caiyun, Shi, Kailun, Wang, Jinxiao, Sun, Guanjun, Hu, Qiaochu, Zhao, Fengyun, Wang, Xue
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.03.2018
• Subjects: Detoxicity; Rare earths; Rice; Subcelluar distribution; Tolerance; Yttrium; Tolerance; Detoxicity; Yttrium; Rare earths; Subcelluar distribution; Rice
• ISSN: 1002-0721; 2509-4963
• DOI: 10.1016/j.jre.2017.09.006

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. [Display omitted]