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| Lead adsorption and fixation mechanisms in root cell walls of Neyraudia reynaudiana |
| Received:October 14, 2019 |
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| KeyWord:Neyraudia reynaudiana;Pb;adsorption;cell wall;tolerance mechanism |
| Author Name | Affiliation | E-mail | | CAO Sheng | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China
Key Laboratory of Soil and Water Conservation State Forestry and Grassland Administration, Southern Red Soil Region, Fuzhou 350002, China
National Positioning Observation and Research Station For Fujian Changting Red Soil Hill Ecosystem, Changting 366300, China | | | LUO Jie-wen | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China
Key Laboratory of Soil and Water Conservation State Forestry and Grassland Administration, Southern Red Soil Region, Fuzhou 350002, China
National Positioning Observation and Research Station For Fujian Changting Red Soil Hill Ecosystem, Changting 366300, China | | | HU Hua-ying | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China
Key Laboratory of Soil and Water Conservation State Forestry and Grassland Administration, Southern Red Soil Region, Fuzhou 350002, China
National Positioning Observation and Research Station For Fujian Changting Red Soil Hill Ecosystem, Changting 366300, China | | | ZHANG Hong | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China
Key Laboratory of Soil and Water Conservation State Forestry and Grassland Administration, Southern Red Soil Region, Fuzhou 350002, China
National Positioning Observation and Research Station For Fujian Changting Red Soil Hill Ecosystem, Changting 366300, China | | | ZHOU Chui-fan | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China
Key Laboratory of Soil and Water Conservation State Forestry and Grassland Administration, Southern Red Soil Region, Fuzhou 350002, China
National Positioning Observation and Research Station For Fujian Changting Red Soil Hill Ecosystem, Changting 366300, China | zhouchuifan@163.com | | LIU Bo | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China
Key Laboratory of Soil and Water Conservation State Forestry and Grassland Administration, Southern Red Soil Region, Fuzhou 350002, China | |
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| Abstract: |
| Neyraudia reynaudiana is a plant with a large biomass, low soil nutrient tolerance, and high enrichment ability for the heavy metal Pb. In order to study the Pb tolerance mechanisms of Neyraudia reynaudiana, the root cell wall was studied by chemical modification, and the Pb adsorption kinetics were determined. The results show that, first, the amount of Pb2+ adsorbed by the root cell wall was reduced by 68.1% after partial hydroxyl functional group removal by esterification. Second, pectinase removed some of the pectin from the cell wall, after partial amino group removal by methylation. These two processes decreased the amount of Pb adsorbed by 48.9% and 41.1%, respectively. Fourier infrared spectroscopy was used to study the Pb2+ adsorption capacity of different components of the Neyraudia reynaudiana cell wall. The hydroxyl group provided by pectin, the carboxyl group provided by cellulose and hemicellulose, and the amino functional group provided by cell wall proteins, are all important sites for Neyraudia reynaudiana to immobilize Pb2+. This shows that the hydroxyl group, carboxyl group and amino group can all provide Pb binding sites in the cell wall; in particular, the hydroxyl functional group enables the cell wall to have a high Pb adsorption and immobilization ability, and constitutes an important mechanism for Neyraudia reynaudiana to resist Pb stress. |
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