期刊
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
卷 122, 期 -, 页码 392-398出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ecoenv.2015.09.007
关键词
Cd; Rice; Bioaccumulation; Adsorption isotherms; Antioxidant enzymes; FTIR
资金
- Key Special Project for Agricultural Ecology and Environment, the Ministry of Agriculture, PRC
- Natural Science Foundation of China [41430752]
- State Key Laboratory of Tea Plant Biology and Utilization
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. (C) 2015 Elsevier Inc. All rights reserved.
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