title: Effect of arsenite-oxidizing bacterium B. laterosporus on arsenite toxicity and arsenic translocation in rice seedlings.
abstract: Arsenite [As (III)] oxidation can be accelerated by bacterial catalysis, but the effects of the accelerated oxidation on arsenic toxicity and translocation in rice plants are poorly understood. Herein we investigated how an arsenite-oxidizing bacterium, namely Brevibacillus laterosporus, influences As (III) toxicity and translocation in rice plants. Rice seedlings of four cultivars, namely Guangyou Ming 118 (GM), Teyou Hang II (TH), Shanyou 63 (SY) and Minghui 63 (MH), inoculated with or without the bacterium were grown hydroponically with As (III) to investigate its effects on arsenic toxicity and translocation in the plants. Percentages of As (III) oxidation in the solutions with the bacterium (100%) were all significantly higher than those without (30-72%). The addition of the bacterium significantly decreased As (III) concentrations in SY root, GM root and shoot, while increased the As (III) concentrations in the shoot of SY, MH and TH and in the root of MH. Furthermore, the As (III) concentrations in the root and shoot of SY were both the lowest among the treatments with the bacterium. On the other hand, its addition significantly alleviated the As (III) toxicity on four rice cultivars. Among the treatments amended with B. laterosporus, the bacterium showed the best remediation on SY seedlings, with respect to the subdued As (III) toxicity and decreased As (III) concentration in its roots. These results indicated that As (III) oxidation accelerated by B. laterosporus could be an effective method to alleviate As (III) toxicity on rice seedlings.
authors.affiliation: Fujian Provincial Key Laboratory of Agroecological Processing and Safety Monitoring, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
authors.forename: Gui-Di
authors.initials: GD
authors.lastname: Yang
authors.affiliation: Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
authors.forename: Wan-Ying
authors.initials: WY
authors.lastname: Xie
authors.affiliation: Fujian Provincial Key Laboratory of Agroecological Processing and Safety Monitoring, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
authors.forename: Xi
authors.initials: X
authors.lastname: Zhu
authors.affiliation: Fujian Provincial Key Laboratory of Agroecological Processing and Safety Monitoring, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Huang
authors.affiliation: Fujian Provincial Key Laboratory of Agroecological Processing and Safety Monitoring, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
authors.forename: Xiao-Jun
authors.initials: XJ
authors.lastname: Yang
authors.affiliation: Fujian Provincial Key Laboratory of Agroecological Processing and Safety Monitoring, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
authors.forename: Zong-Qing
authors.initials: ZQ
authors.lastname: Qiu
authors.affiliation: Fujian Provincial Key Laboratory of Agroecological Processing and Safety Monitoring, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
authors.forename: Zhen-Mao
authors.initials: ZM
authors.lastname: Lv
authors.affiliation: Fujian Provincial Key Laboratory of Agroecological Processing and Safety Monitoring, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
authors.forename: Wen-Na
authors.initials: WN
authors.lastname: Wang
authors.affiliation: Fujian Provincial Key Laboratory of Agroecological Processing and Safety Monitoring, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
authors.forename: Wen-Xiong
authors.initials: WX
authors.lastname: Lin
mesh_terms: D001151:Arsenic / Q000493:pharmacokinetics*; D018053:Arsenites / Q000633:toxicity*; D058675:Brevibacillus / Q000378:metabolism*; D018527:Hydroponics; D012275:Oryza / Q000187:drug effects*; D010084:Oxidation-Reduction; D018517:Plant Roots / Q000187:drug effects; D036226:Seedlings / Q000187:drug effects*; D012989:Soil Pollutants / Q000032:analysis
chemical_list: D018053:Arsenites; D012989:Soil Pollutants; C015001:arsenite; D001151:Arsenic
keywords: Arsenic speciation; Arsenite-oxidizing bacteria; B. laterosporus; CE-ICP-MS; Remediation; Rice (Oryza sativa L.)