title: Lanthanum regulates the reactive oxygen species in the roots of rice seedlings.
abstract: In this study, the effects of La(3+) on the reactive oxygen species (ROS) and antioxidant metabolism were studied in the roots of rice (Oryza sativa L. cv Shengdao 16) exposed to increasing concentrations of La(3+) (0.05, 0.1, 0.5, 1.0, and 1.5 mM). The level of hydrogen peroxide, superoxide anion, and malondialdehyde was increased by 0.5, 1.0 and 1.5 mM La(3+), and the activity of catalase and peroxidase was increased by 0.05 and 0.1 mM La(3+). However, La(3+) treatments stimulated superoxide dismutase activity in the roots of rice seedlings at all tested concentrations. In addition, the probe 2',7'-dichlorofluorescein diacetate (H2DCF-DA) was used to investigate the instantaneous change of ROS in the root cells with the laser-scanning confocal microscopy. The result indicated that ROS level was declined after treated with 0.05 mM La(3+). The results showed that the appropriate concentration of La(3+) decreased the level of ROS, and hormetic effects on the antioxidant metabolism were found in the roots of rice exposed to 0.05, 0.1, 0.5, 1.0, and 1.5 mM La(3+).
authors.affiliation: School of Life Sciences, Shandong University of Technology, Zibo, Shandong, 255049, China.
authors.forename: Dongwu
authors.initials: D
authors.lastname: Liu
authors.affiliation: School of Life Sciences, Shandong University of Technology, Zibo, Shandong, 255049, China.
authors.forename: Shengnan
authors.initials: S
authors.lastname: Zheng
authors.affiliation: School of Life Sciences, Shandong University of Technology, Zibo, Shandong, 255049, China.
authors.forename: Xue
authors.initials: X
authors.lastname: Wang
mesh_terms: D000975:Antioxidants / Q000378:metabolism*; D018506:Gene Expression Regulation, Plant / Q000187:drug effects; D006861:Hydrogen Peroxide / Q000378:metabolism; D007811:Lanthanum / Q000494:pharmacology*; D008315:Malondialdehyde / Q000378:metabolism; D012275:Oryza / Q000187:drug effects* / Q000378:metabolism; D009195:Peroxidase / Q000378:metabolism; D010940:Plant Proteins / Q000378:metabolism*; D018517:Plant Roots / Q000187:drug effects / Q000378:metabolism; D017382:Reactive Oxygen Species / Q000378:metabolism*; D036226:Seedlings / Q000187:drug effects / Q000378:metabolism; D013482:Superoxide Dismutase / Q000378:metabolism
chemical_list: D000975:Antioxidants; D010940:Plant Proteins; D017382:Reactive Oxygen Species; D008315:Malondialdehyde; D007811:Lanthanum; D006861:Hydrogen Peroxide; D009195:Peroxidase; D013482:Superoxide Dismutase