title: Effects of silicon on the distribution of cadmium compartmentation in root tips of Kandelia obovata (S., L.) Yong.
abstract: The Effects of silicon (Si) on the distribution of cadmium (Cd) compartmentation in root tips of Kandelia obovata (S., L.) Yong were investigated by pot experiments. Cd concentrations in the apoplastic saps and symplastic fractions of the root tips of K. obovata seedlings were decreased at both Si-supplied treatments. Si addition reduced the concentrations of BaCl(2-)extractable cell-wall-Cd in root tips, but increased the concentrations of Na(3)citrate-extractable cell-wall-Cd and HCl-extractable cell-wall-Cd in root tips. The total root-tip contents of Cd were mainly distributed in the apoplast and most of the Cd in the apoplast was bound to the cell wall. Our experiment found that Si increased the ratio of apoplast Cd (>87.08%) and reduced the ratio of Cd in the symplast (<12.92%). This suggested that Si enhanced binding of Cd to the cell walls and restricted the apoplastic transport of Cd.
authors.affiliation: Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, and School of Life Sciences, Xiamen University, Xiamen, Fujian Province, China. yejuan168121@163.com
authors.forename: Juan
authors.initials: J
authors.lastname: Ye
authors.forename: Chongling
authors.initials: C
authors.lastname: Yan
authors.forename: Jingchun
authors.initials: J
authors.lastname: Liu
authors.forename: Haoliang
authors.initials: H
authors.lastname: Lu
authors.forename: Tao
authors.initials: T
authors.lastname: Liu
authors.forename: Zengfeng
authors.initials: Z
authors.lastname: Song
mesh_terms: D001692:Biological Transport; D002104:Cadmium / Q000032:analysis / Q000378:metabolism*; D002473:Cell Wall / Q000737:chemistry / Q000378:metabolism; D018519:Meristem / Q000737:chemistry / Q000378:metabolism*; D043982:Rhizophoraceae / Q000737:chemistry / Q000378:metabolism*; D012825:Silicon / Q000032:analysis / Q000378:metabolism*
chemical_list: D002104:Cadmium; D012825:Silicon