Reduction, methylation, and translocation of arsenic in Panax notoginseng grown under field conditions in arsenic-contaminated soils
文献类型： 外文期刊
作者： Ma, Jie 1 ; Mi, Yanhua 1 ; Li, Qiwan 1 ; Chen, Lu 1 ; Du, Lijuan 1 ; He, Lizhong 1 ; Lei, Mei 2 ;
作者机构： 1.Yunnan Acad Agr Sci, Agri Food Qual Standard & Testing Technol Inst, Kunming 650221, Peoples R China
2.Chinese Acad Sci, Ctr Environm Remediat, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China
关键词： Panax notoginseng;Arsenic species;Soil;Reduction;Methylation;Translocation
期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：7.963； 五年影响因子：7.842 ）
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收录情况： SCI
摘要： Variations in arsenic (As) species in Panax notoginseng grown under field conditions remain understudied compared with those under greenhouse conditions. In the present study, soil and plant samples were collected from Wenshan Zhuang and Miao Autonomous Prefecture, Yunnan Province, which is the main production area of P. notoginseng in China, to identify As species in the soil and plant tissues and further assess effect of As toxic stress on As transformation and translocation in P. notoginseng. The results showed that arsenate (As(V)) was almost exclusively identified in the soil, while arsenite (As(III)) and monomethylarsonic acid (MMA) were detected in high proportions in plant tissues, suggesting that As(V) could be reduced and subsequently methylated in the plant body, mainly in the root. The reduction and methylation of As in the root of P. notoginseng were promoted by low As toxic stress, but were impeded by high As toxic stress. Arsenic(III) and MMA could rapidly translocate upwards in P notoginseng. In addition, the translocation of total As, As(III), and MMA from the root to the rhizome was a response to As toxic stress, and the translocation rate increased with the increasing As concentration in the taproot. This study provides new insights into the detoxification mechanism of P. notoginseng grown in As contaminated soils and the control of As during cultivation. (C) 2016 Elsevier B.V. All rights reserved.
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