The uptake and detoxification of antimony by plants: A review

详细信息    查看全文

• 作者：Renwei Feng ; Chaoyang Wei ; Shuxin Tu ; Yongzhen Ding ; Ruigang Wang ; Junkang Guo
• 关键词：Antimony ; Speciation transformation ; Toxicity ; Plants ; Absorption
• 刊名：Environmental and Experimental Botany
• 出版年：December, 2013
• 年：2013
• 卷：96
• 期：Complete
• 页码：28-34
• 全文大小：1152 K

文摘

Many crops cultivated in mining areas have been found to accumulate high levels of antimony (Sb) in their edible parts, thereby causing potential risks to human health. Understanding the behaviours of Sb in plants is important, particularly the mechanisms involved in its uptake, toxicity, detoxification and accumulation in crops. Many factors affect the uptake of Sb in plants, including water management, Sb speciation and some coexisting ions in soils. At present, the mechanisms of Sb uptake by plants have not been fully elucidated so far. The uptake of Sb has been proposed to occur mainly through the passive pathway; however, it is possible that an active pathway exists as well. Antimony can damage plants, including growth retardation, inhibition of photosynthesis, decreases in the uptake of certain essential elements and decreases in the synthesis of certain metabolites. Plants often have defence mechanisms to alleviate Sb toxicity; e.g., a highly efficient antioxidative system and the ability to immobilise Sb in the cell wall or compartmentalise Sb in the cytosol. Such mechanisms have been widely reported in Sb-tolerant and Sb-accumulating plants. In view of the above knowledge, several questions remain: (1) What is the actual uptake pathway of Sb in plants? (2) Does Sb participate in redox reactions within plants? (3) What is the role of metabolic reactions of Sb in Sb toxicity to plants? (4) Can Sb be methylated, and if so, how? (5) How does Sb induce bursts of reactive oxidative species (ROS)?