TITLE

Differential toxicity and accumulation of inorganic and methylated arsenic in rice

AUTHOR(S)
Zheng, Mao-Zhong; Li, Gang; Sun, Guo-Xin; Shim, Hojae; Cai, Chao
PUB. DATE
April 2013
SOURCE
Plant & Soil;Apr2013, Vol. 365 Issue 1/2, p227
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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 (As) and dimethylarsinic acid (DMA) in rice plants. Methods: Rice was exposed to As (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 As. Rice grains accumulated 2-fold higher DMA than As. The distribution of As 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 As 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 As mainly remained in the vegetative tissues and had no significant effect on yield. DMA is more toxic than As to the reproductive tissues when both of them are at similar concentrations in nutrient solution.
ACCESSION #
86145003

 

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