Bhabha Atomic Research Centre, Trombay, Mumbai, India.
Chemosphere. 2011 Jan;82(4):529-34. doi: 10.1016/j.chemosphere.2010.10.059. Epub 2010 Nov 11.
Sesuvium portulacastrum (L.) L., a facultative halophyte, is considered a suitable candidate for the phytoremediation of metals. An investigation of As accumulation and tolerance was conducted in Sesuvium plants upon exposure to As(V) (100-1000 μM) for 30 d. Plants demonstrated a good growth even after prolonged exposure (30 d) to high As(V) concentrations (1000 μM) and a significant As accumulation (155 μg g⁻¹ dry weight) with a bioaccumulation factor of more than ten at each concentration. The results of shoot and root dry weight, malondialdehyde accumulation, photosynthetic pigments, and total soluble proteins demonstrated that plants did not experience significant toxicity even at 1000 μM As(V) after 30 d. However, metabolites (total non-protein thiols and cysteine) and enzymes (serine acetyltransferase, cysteine synthase and γ-glutamylcysteine synthetase) of thiol metabolism, in general, remained either unaffected or showed slight decline. Hence, plants tolerated high As(V) concentrations without an involvement of thiol metabolism as a major component. Taken together, the results indicate that plants are potential As accumulator and may find application in the re-vegetation of As contaminated sites.
海蓬子（Sesuvium portulacastrum（L.）L.）是一种兼性盐生植物，被认为是金属植物修复的合适候选植物。本研究调查了海蓬子在暴露于砷（V）（100-1000 μM）30 d 后对砷的积累和耐受能力。即使在长时间（30 d）暴露于高浓度砷（V）（1000 μM）的情况下，植物仍表现出良好的生长，并且在每个浓度下都具有超过 10 的生物积累因子，显著积累了 155 μg g⁻¹ 干重的砷。在 30 d 后，即使在 1000 μM As(V) 下， Shoot 和 root 干重、丙二醛积累、光合色素和总可溶性蛋白的结果表明，植物并未经历明显的毒性。然而，一般来说，巯基代谢的代谢物（总非蛋白巯基和半胱氨酸）和酶（丝氨酸乙酰转移酶、半胱氨酸合酶和γ-谷氨酰半胱氨酸合酶）保持不受影响或略有下降。因此，植物在不涉及巯基代谢作为主要成分的情况下耐受高浓度的 As(V)。总之，结果表明，植物是潜在的砷积累者，可能在砷污染场地的植被恢复中得到应用。
