Effects of root oxidation ability and P on As mobility and bioavailability in rice

作     者：吴川 潘炜松 薛生国 莫竞瑜 WU Chuan;PAN Wei-song;XUE Sheng-guo;MO Jing-yu

作者机构：School of Metallurgy and Environment Central South University College of Bioscience and Biotechnology Hunan Agricultural University 

出 版 物：《Journal of Central South University》 (中南大学学报（英文版）)

年 卷 期：2015年第22卷第1期

页      面：74-81页

核心收录：

学科分类：08[工学] 09[农学] 0815[工学-水利工程] 0901[农学-作物学] 

基　　金：Project(41201493)supported by the National Natural Science Foundation of China Project(201109056)supported by Special Scientific Research of Environmental Protection for Public Welfare Industry,China 

主　　题：arsenic phosphorus radial oxygen loss rice speciation 

摘      要：The effects of root oxidization ability and P fertilization on As mobility in soils, and subsequently As uptake, translocation and speciation in rice plants were investigated. Results show that root oxidation significantly influences As mobility in *** TD71 with higher radial oxygen loss(ROL) induces more Fe plaque formation and sequesters more As and P in iron plaque and rhizoshphere soil, leading to the reduction of As accumulation in rice plants. Additionally, P addition mobilizes As in soil solution, and increases As accumulation in rice plants. Arsenic speciation results show that the majority of As species in husks detected is inorganic As, accounting for 82%-93% of the total As, while in grains the majority of As is inorganic As and dimethyl arsenic(DMA), with DMA accounting for 33%-64% of the total As. The fraction of inorganic As decreases while fraction of DMA increases, with increasing As and P concentrations. The study further elucidates the mechanisms involved in effects of ROL on As tolerance and accumulation in rice.