title: Effects of cadmium on bioaccumulation and biochemical stress response in rice (Oryza sativa L.).
abstract: This study investigated the effects of various Cd concentrations on the bioaccumulation, antioxidative defense, and stress responses of rice (Oryza sativa L.). The distribution characteristics of Cd in rice were in the following order: roots>stems>grains. The bioconcentration factor values of Cd increased at concentrations lower than 3.00 mg Cd/kg and approximately decreased to a constant value at concentrations higher than 3.00 mg Cd/kg. Rice showed a higher Cd accumulation potential at low Cd concentrations than at high Cd concentrations. The Freundlich isotherm model described well the adsorption isotherms of Cd in rice roots. The biosorption mechanism of rice roots was determined to be cooperative adsorption. The malondialdehyde (MDA) content increased at a concentration range of 0.00-5.00 mg/L, indicating the enhancement of lipid peroxidation. By contrast, the MDA content slightly decreased at concentrations higher than 5.00 mg/L. Peroxidase (POD) activity exhibited active response to oxidative stress at concentrations lower than 5.00 mg/L but was inhibited at concentrations higher than 5.00 mg/L. The response to Cd stress of the N-H, O-H and C-O functional groups in rice shoots was observed via Fourier transform infrared spectroscopy.
authors.affiliation: School of Resource and Environment, Anhui Agricultural University, Hefei 230036, People's Republic of China.
authors.forename: Pan-pan
authors.initials: PP
authors.lastname: Xie
authors.affiliation: School of Resource and Environment, Anhui Agricultural University, Hefei 230036, People's Republic of China.
authors.forename: Juan-wei
authors.initials: JW
authors.lastname: Deng
authors.affiliation: School of Resource and Environment, Anhui Agricultural University, Hefei 230036, People's Republic of China.
authors.forename: Hui-min
authors.initials: HM
authors.lastname: Zhang
authors.affiliation: School of Resource and Environment, Anhui Agricultural University, Hefei 230036, People's Republic of China.
authors.forename: You-hua
authors.initials: YH
authors.lastname: Ma
authors.affiliation: School of Resource and Environment, Anhui Agricultural University, Hefei 230036, People's Republic of China. Electronic address: cdj@ahau.edu.cn.
authors.forename: De-ju
authors.initials: DJ
authors.lastname: Cao
authors.affiliation: School of Resource and Environment, Anhui Agricultural University, Hefei 230036, People's Republic of China.
authors.forename: Ru-xiao
authors.initials: RX
authors.lastname: Ma
authors.affiliation: School of Resource and Environment, Anhui Agricultural University, Hefei 230036, People's Republic of China.
authors.forename: Ren-jing
authors.initials: RJ
authors.lastname: Liu
authors.affiliation: School of Resource and Environment, Anhui Agricultural University, Hefei 230036, People's Republic of China.
authors.forename: Cheng
authors.initials: C
authors.lastname: Liu
authors.affiliation: School of Resource and Environment, Anhui Agricultural University, Hefei 230036, People's Republic of China.
authors.forename: Yue-gan
authors.initials: YG
authors.lastname: Liang
mesh_terms: D000327:Adsorption; D002104:Cadmium / Q000032:analysis / Q000633:toxicity*; D002374:Catalase / Q000378:metabolism; D015227:Lipid Peroxidation / Q000187:drug effects; D008315:Malondialdehyde / Q000378:metabolism; D012275:Oryza / Q000737:chemistry / Q000187:drug effects* / Q000201:enzymology; D018384:Oxidative Stress / Q000187:drug effects*; D009195:Peroxidase / Q000378:metabolism; D018517:Plant Roots / Q000737:chemistry / Q000187:drug effects / Q000201:enzymology; D012989:Soil Pollutants / Q000032:analysis / Q000633:toxicity*; D017550:Spectroscopy, Fourier Transform Infrared; D013482:Superoxide Dismutase / Q000378:metabolism
chemical_list: D012989:Soil Pollutants; D002104:Cadmium; D008315:Malondialdehyde; D002374:Catalase; D009195:Peroxidase; D013482:Superoxide Dismutase
keywords: Adsorption isotherms; Antioxidant enzymes; Bioaccumulation; Cd; FTIR; Rice