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Title of Journal: Plant Soil

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Abbravation: Plant and Soil

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Springer Netherlands

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DOI

10.1007/s11104-012-1376-3

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ISSN

1573-5036

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Differential toxicity and accumulation of inorgani

Authors: MaoZhong Zheng Gang Li GuoXin Sun Hojae Shim Chao Cai
Publish Date: 2012/07/28
Volume: 365, Issue: 1-2, Pages: 227-238
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Abstract

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 plantsRice was exposed to Asi AsV and DMA in hydroponics Highperformance liquid chromatography inductively coupled plasma mass spectrometry HPLCICPMS and synchrotron Xray fluorescence SXRF microprobe were used to determine As concentration and the in situ As distributionDMA induced abnormal florets before flowering and caused a sharp decline in the seed setting rate after flowering compared to Asi Rice grains accumulated 2fold higher DMA than Asi The distribution of Asi concentration root  leaf  husk  caryopsis in AsV 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 tissuesDMA 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 solutionThis work was supported by Knowledge Innovation Program of the Chinese Academy of Sciences KZCX2YWQ0204 The National Environmental Protection Public Welfare Industry Targeted Research Fund 201109052 the foundation of Macau University MYRG204Y1L4FST11SHJ and Social Development of Yunnan Province Science and Technology Plan Special social development fund 2010CA001 We thank the Shanghai Synchrotron Radiation Facility for providing technical support in the synchrotron xray fluorescent microprobe We also thank Prof FangJie Zhao for his critical comments on the manuscript

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