Recent advances in arsenic bioavailability, transport, and speciation in rice

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• 作者：Xin Wang (1)
  Bo Peng (1)
  Changyin Tan (1)
  Lena Ma (2) (3)
  Bala Rathinasabapathi (4)
  
  1. College of Resources and Environmental Science ; Hunan Normal University ; Changsha ; 410081 ; Hunan ; China
  2. Soil and Water Science Department ; University of Florida ; Gainesville ; FL ; 32611 ; USA
  3. State Key Laboratory of Pollution Control and Resource Reuse ; School of the Environment ; Nanjing University ; Jiangsu ; 210046 ; China
  4. Horticultural Sciences Department ; University of Florida ; Gainesville ; FL ; 32611 ; USA
  
• 关键词：Arsenite ; Biochar ; Transport ; Speciation ; Rice grain
• 刊名：Environmental Science and Pollution Research
• 出版年：2015
• 出版时间：April 2015
• 年：2015
• 卷：22
• 期：8
• 页码：5742-5750
• 全文大小：703 KB
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• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Environment
  Atmospheric Protection, Air Quality Control and Air Pollution
  Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution
  Industrial Pollution Prevention
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1614-7499

文摘

Widespread arsenic (As) contamination in paddy rice (Oryza sativa) from both geologic and anthropogenic origins is an increasing concern globally. Substantial efforts have been made to elucidate As transformation and uptake processes in rhizosphere and metabolism in rice plant, which provides an essential foundation for the development of mitigation strategies. However, a range of crucial mechanisms from As mobilization in rhizosphere to transport to grains remain poorly understood. To provide new insight into the underlying mechanisms of As accumulation in rice, a range of new perspectives on As bioavailability, transport pathways, and in situ speciation are reviewed here. Specifically, the prominent effects of water regime, Fe plaque, and biochar on As mobilization in rice rhizosphere are discussed critically. An updated understanding of arsenite (AsIII) and methylated As transport from root to vascular bundle and grain is integrated and discussed in detail. Special attention is given to As speciation and distribution in rice grain with potential coping strategies being provided and discussed. Future research priorities are also identified. The new insight into As bioavailability, transport and speciation in rice would lead to a better understanding of As contamination in rice. They would also provide useful strategies from agronomic measures to genetic engineering for more effective restriction of As transport and accumulation in food chain.