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Differential toxicity and accumulation of inorganic and methylated arsenic in rice
Zheng MZ1,2; Li G1; Sun GX3; Shim H4; Cai C1
Source PublicationPlant and Soil

Background and aims  Efficient accumulation of arsenic (As) in rice (Oryza sativa L.) poses a potential health risk to rice consumers. The aim of this study was to investigate the mechanisms of uptake, transport and distribution of inorganic arsenic (Asi) and dimethylarsinic acid (DMA) in rice plants.

Methods  Rice was exposed to Asi (As(V)) and DMA in hydroponics. High-performance liquid chromatography inductively coupled plasma mass spectrometry (HPLC-ICP-MS) and synchrotron X-ray fluorescence (SXRF) microprobe were used to determine As concentration and the in situ As distribution.

Results  DMA induced abnormal florets before flowering and caused a sharp decline in the seed setting rate after flowering compared to Asi. Rice grains accumulated 2-fold higher DMA than Asi. The distribution of Asi concentration (root > leaf > husk > caryopsis) in As(V) treatments was different from that of the DMA concentration (caryopsis > husk > root ≥ leaf) in DMA treatments. SXRF showed that Asi mainly accumulated in the vascular trace of caryopsis with limited distribution to the endosperm, whereas DMA was observed in both tissues.

Conclusions  DMA tended to accumulate in caryopsis and induced higher toxicity to the reproductive tissues resulting in markedly reduced grain yield, whereas Asi mainly remained in the vegetative tissues and had no significant effect on yield. DMA is more toxic than Asi to the reproductive tissues when both of them are at similar concentrations in nutrient solution. 

KeywordRice Arsenic Dimethylarsinic Acid Hplc-icp-ms Sxrf
URLView the original
Indexed BySCI
WOS Research AreaAgriculture ; Plant Sciences
WOS SubjectAgronomy ; Plant Sciences ; Soil Science
WOS IDWOS:000316391400016
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Cited Times [WOS]:38   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
Corresponding AuthorCai C
Affiliation1.Chinese Acad Sci, Inst Urban Environm, Key Lab Urban Environm & Hlth, Xiamen 361021, Peoples R China
2.Wuyi Univ, Tea Sci & Biol Dept, Wuyishan 354300, Fujian, Peoples R China
3.Chinese Acad Sci, Ecoenvironm Sci Res Ctr, Beijing 100085, Peoples R China
4.Univ Macau, Taipa, Macau Sar, Peoples R China
Recommended Citation
GB/T 7714
Zheng MZ,Li G,Sun GX,et al. Differential toxicity and accumulation of inorganic and methylated arsenic in rice[J]. Plant and Soil,2013,365(1-2):227-238.
APA Zheng MZ,Li G,Sun GX,Shim H,&Cai C.(2013).Differential toxicity and accumulation of inorganic and methylated arsenic in rice.Plant and Soil,365(1-2),227-238.
MLA Zheng MZ,et al."Differential toxicity and accumulation of inorganic and methylated arsenic in rice".Plant and Soil 365.1-2(2013):227-238.
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