Institute of Soil and Water Resources and Environmental Science, Zhejiang Provincial Key Laboratory of Subtropical Soil and Plant Nutrition, Zhejiang University, Hangzhou, 310058, China.
Bull Environ Contam Toxicol. 2014 Apr;92(4):478-82. doi: 10.1007/s00128-013-1195-0. Epub 2014 Jan 14.
Vallisneria natans (Lour.) Hara, a widely distributed submerged aquatic plant, is a promising species for arsenic (As) removal from contaminated water. We investigated the effects of pH on the accumulation, subcellular distribution and detoxification of As in V. natans. The results showed that the optimum pH for submerged V. natans growth is close to 7.0. The accumulation of As in the plant increased with the increase of pH (p < 0.05). This may have been due to arsenic/phosphate transporters with a higher affinity for the more highly electronegative AsO4 (3-) than for HAsO4 (2-) and H2AsO4 (-). After As(V) was accumulated by plants, more than 80 % was reduced to As(III), but As reduction decreased with increased pH. The majority of accumulated As and reduced As(III) (47 %-66 %) was found in the vacuoles. Higher As concentrations in vacuoles could be considered as an important mechanism for As detoxification in submerged plants.
水蕴草（Vallisneria natans（Lour.）Hara）是一种广泛分布的水生沉水植物，是从受污染的水中去除砷（As）的有前途的物种。我们研究了 pH 值对水蕴草中砷的积累、亚细胞分布和解毒的影响。结果表明，水蕴草生长的最佳 pH 值接近 7.0。植物中砷的积累随 pH 值的增加而增加（p < 0.05）。这可能是由于砷/磷酸盐转运蛋白对带更高负电荷的 AsO4（3-）的亲和力高于 HAsO4（2-）和 H2AsO4（-）。植物积累 As（V）后，超过 80%被还原为 As（III），但随着 pH 值的增加，As 的还原减少。大部分积累的 As 和还原的 As（III）（47%-66%）存在于液泡中。液泡中较高的 As 浓度可被认为是水生植物中 As 解毒的重要机制。
