title: Pathways of cadmium fluxes in the root of the halophyte Suaeda salsa.
abstract: Halophyte plants offer a greater potential for phytoremediation research for reducing the levels of toxic metals from saline soils than salt sensitive plants. Using the scanning ion-selective electrode technique, we analyzed the pattern and rate of Cd(2+) fluxes at different regions of the root apex of Suaeda salsa. The Cd(2+) influx in the rhizosphere was greatest near the root tip (within 150μm of the tip). The results indicated that Cd(2+) influx into roots was significantly suppressed by the pre-treatment or in the presence of two kinds of Ca(2+) channel blockers; LaCl(3) and verapamil. The Cd(2+) influx was also reduced by N-ethylmaleimide, a thiol blocker. Cd content determination and labeling of Cd using fluorescent dye support our conclusion. The results of this study provide a more stable theoretical basis for the phytoremediation of Cd contamination in saline soils of coastal zones.
authors.affiliation: Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, People's Republic of China.
authors.forename: Lianzhen
authors.initials: L
authors.lastname: Li
authors.forename: Xiaoli
authors.initials: X
authors.lastname: Liu
authors.forename: Willie J G M
authors.initials: WJ
authors.lastname: Peijnenburg
authors.forename: Jianmin
authors.initials: J
authors.lastname: Zhao
authors.forename: Xiaobing
authors.initials: X
authors.lastname: Chen
authors.forename: Junbao
authors.initials: J
authors.lastname: Yu
authors.forename: Huifeng
authors.initials: H
authors.lastname: Wu
mesh_terms: D001673:Biodegradation, Environmental; D002104:Cadmium / Q000378:metabolism* / Q000633:toxicity; D019663:Chenopodiaceae / Q000378:metabolism* / Q000502:physiology; D005033:Ethylmaleimide / Q000378:metabolism; D018517:Plant Roots / Q000378:metabolism; D058441:Rhizosphere; D055051:Salt-Tolerant Plants / Q000378:metabolism / Q000502:physiology; D012965:Sodium Chloride / Q000378:metabolism; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000378:metabolism* / Q000633:toxicity
chemical_list: D012987:Soil; D012989:Soil Pollutants; D002104:Cadmium; D012965:Sodium Chloride; D005033:Ethylmaleimide