State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, People's Republic of China.
Chemosphere. 2013 Sep;93(1):47-53. doi: 10.1016/j.chemosphere.2013.04.063. Epub 2013 May 29.
Ostreococcus tauri is a marine green microalga, recognized as a model organism of the marine phytoplankton assemblage and widely distributed from coastal to oligotrophic waters. This study showed it could tolerate both arsenite and arsenate concentrations of up to 100μM, and cellular As concentration increased significantly (P<0.01) with increasing concentration of As(V) in the medium (0-50μM). It was revealed that As biotransformations were mediated by algal cells. Volatilized As was detected and the ability of As biovolatilization by O. tauri was demonstrated. The reduction of As(V) to As(III) might be the limiting step for As methylation and volatilization from seawater since the treatment with As(III) yielded five times more volatile As as compared to that with As(V). Arsenic biogeochemical cycle in the marine environment might play an important role based on the huge surface area of ocean (71%) and the massive number of marine phytoplankton.
盘基网柄菌是一种海洋绿藻，被认为是海洋浮游植物组合的模式生物，广泛分布于沿海到贫营养水域。本研究表明，它可以耐受高达 100μM 的亚砷酸盐和砷酸盐浓度，并且细胞内 As 浓度随着培养基中 As(V)浓度（0-50μM）的增加而显著增加（P<0.01）。结果表明，As 的生物转化是由藻类细胞介导的。检测到挥发的 As，并证明了盘基网柄菌的 As 生物挥发能力。由于用 As(III)处理比用 As(V)处理产生的挥发性 As 多五倍，因此 As(V)还原为 As(III)可能是 As 甲基化和从海水中挥发的限制步骤。基于海洋（71%）巨大的表面积和大量的海洋浮游植物，海洋环境中的砷生物地球化学循环可能起着重要的作用。
