title: Accumulation and speciation of Cd in Avicennia marina tissues.
abstract: Avicennia marina is a high-Cd-tolerant species in the mangrove wetlands. A hydroponic experiment was carried out to research the accumulation and chemical form distribution of Cd in the tissues of A. marina under different concentrations and durations of Cd stress. It was found that the concentrations of Cd in plant tissues followed the order of root > stem > leaf. The data suggested that root activity decreased, Cd accumulation ability weakened in roots, and the translocation factor increased in stems and leaves with the increase of stress duration. With a proactive defense mechanism, most Cd was bound to pectates, organic acids, and protein, especially in roots and stems with the most proportion of 88.51 and 78.91%, respectively, having lower biological activities. The Cd bounded to water-soluble organic acid and free inorganic aminophenol-Cd showed the lowest concentration. The pectates, organic acids, and protein-integrated Cd seem the most important in affecting Cd detoxification for A. marina; this mechanism of change in Cd biological activities decreases the toxicity of this aggressive pollutant and presents new knowledge about the tolerance of mangrove plants.
authors.affiliation: a School of the Environment and Safety Engineering, Institute of Environment and Ecology , Jiangsu University , Zhenjiang , China.|b Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems , Xiamen University , Xiamen , China.
authors.forename: Li
authors.initials: L
authors.lastname: Jian
authors.affiliation: b Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems , Xiamen University , Xiamen , China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Chongling
authors.affiliation: a School of the Environment and Safety Engineering, Institute of Environment and Ecology , Jiangsu University , Zhenjiang , China.
authors.forename: Du
authors.initials: D
authors.lastname: Daolin
authors.affiliation: b Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems , Xiamen University , Xiamen , China.
authors.forename: Lu
authors.initials: L
authors.lastname: Haoliang
authors.affiliation: b Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems , Xiamen University , Xiamen , China.
authors.forename: Liu
authors.initials: L
authors.lastname: Jingchun
mesh_terms: D032407:Avicennia / Q000378:metabolism; D001673:Biodegradation, Environmental; D002104:Cadmium / Q000378:metabolism; D018515:Plant Leaves; D014874:Water Pollutants, Chemical / Q000378:metabolism; D053833:Wetlands
chemical_list: D014874:Water Pollutants, Chemical; D002104:Cadmium
keywords: Avicennia marina; Mangrove; cadmium; species distribution