Impact of waterlogging on the uptake of arsenic by hyperaccumulator and tolerant plant WanXiao-ming LeiMei ChenTong-bin YangJun ZhouXiao-yong ZhouGuang-dong 2015 <div><p>A significant proportion of arsenic (As)-contaminated sites are temporarily or permanently under reducing condition, which may affect phytoextraction efficiency using the As-hyperaccumulator <i>Pteris vittata</i> L. In this work, a pot experiment was conducted to investigate the solubility and redox species of As in soil. The uptake of As by two populations of <i>P. vittata</i> and As-tolerant grass <i>Holcus lanatus</i> under different water regimes was examined. Waterlogging decreased the redox potential from 350 to−50 mV, leading to an approximately 40% reduction of As(V) to As(III) and an increased dissolved As concentration by 150%–300%. The changes in the speciation and concentration of As influenced its uptake by plants. A population collected from a temporarily waterlogged riverside in Guangxi province (GX population) had ninefold higher shoot As concentration under the waterlogged condition than that under the non-waterlogged condition, indicating that it preferred taking up As in the form of As(III). By contrast, a population of <i>P. vittata</i> collected from a dry land in Yunnan province (YN population) and <i>H. lanatus</i> demonstrated a preference to As(V). The GX population was an appropriate species for the phytoextraction of waterlogged sites. These results implied the importance of habitat ecology on the extraction efficiency of hyperaccumulators.</p></div>