Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen, PR China.
Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen, PR China; State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, PR China.
Mar Pollut Bull. 2018 Oct;135:1174-1182. doi: 10.1016/j.marpolbul.2018.08.040. Epub 2018 Sep 1.
Sulfur and iron are abundant and have close, complex interactions with the biogeochemical cycle of arsenic (As) in mangrove ecosystems. A hydroponic experiment was conducted to investigate the influences of variable SO and Fe supplies on radial oxygen loss (ROL), iron plaque formation and As translocation in Avicennia marina upon exposure to As(III). The results indicate that A. marina is an As-tolerant plant, the application of iron and sulfur not only showed positive growth effects but also induced much higher amounts of ROL-induced iron plaque formation on root surfaces. The presence of iron plaque remarkably improved the proportion of As sequestration near this area but consequently reduced the proportion of As translocation in root. Therefore, it is concluded that iron plaque may act as a barrier for protection against As, and iron and sulfur play important roles in controlling the growth and translocation of As in A. marina seedlings.
硫和铁在数量上丰富，并与红树林生态系统中砷（As）的生物地球化学循环密切相关。本水培实验旨在研究可变 SO 和 Fe 供应对暴露于 As(III)时，红海榄的径向氧气损失（ROL）、铁斑形成和 As 迁移的影响。结果表明，红海榄是一种砷耐受植物，铁和硫的应用不仅表现出积极的生长效应，而且在根表面诱导了更高数量的 ROL 诱导铁斑形成。铁斑的存在显著提高了该区域附近砷固定的比例，但导致根中砷迁移的比例降低。因此，可以得出结论，铁斑可能作为砷的保护屏障，铁和硫在控制红海榄幼苗生长和砷迁移中发挥重要作用。
