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| Cadmium tolerance mechanism of Conyza canadensis based on cell wall adsorption and fixation characteristics |
| Received:September 27, 2018 |
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| KeyWord:Conyza canadensis;cadmium;cell wall;adsorption and fixation characteristics;FTIR |
| Author Name | Affiliation | E-mail | | ZHANG Hong | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China
Cross-Strait Collaborative Innovation Center of Soil and Water Conservation, Fuzhou 350002, China
National Positioning Observation and Research Station of Red Soil Hill Ecosystem in Changting, Fujian, Fuzhou 350002, China | | | LUO Jie-wen | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China
Cross-Strait Collaborative Innovation Center of Soil and Water Conservation, Fuzhou 350002, China
National Positioning Observation and Research Station of Red Soil Hill Ecosystem in Changting, Fujian, Fuzhou 350002, China | | | HU Hua-ying | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China
Cross-Strait Collaborative Innovation Center of Soil and Water Conservation, Fuzhou 350002, China
National Positioning Observation and Research Station of Red Soil Hill Ecosystem in Changting, Fujian, Fuzhou 350002, China | | | CAO Sheng | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China
Cross-Strait Collaborative Innovation Center of Soil and Water Conservation, Fuzhou 350002, China
National Positioning Observation and Research Station of Red Soil Hill Ecosystem in Changting, Fujian, Fuzhou 350002, China | | | ZHOU Chui-fan | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China
Cross-Strait Collaborative Innovation Center of Soil and Water Conservation, Fuzhou 350002, China
National Positioning Observation and Research Station of Red Soil Hill Ecosystem in Changting, Fujian, Fuzhou 350002, China | zhouchuifan@163.com | | HOU Xiao-long | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China
Cross-Strait Collaborative Innovation Center of Soil and Water Conservation, Fuzhou 350002, China
National Positioning Observation and Research Station of Red Soil Hill Ecosystem in Changting, Fujian, Fuzhou 350002, China | |
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| Abstract: |
| We examined the distribution and damage incurred by the tissues of Conyza canadensis due to Cd stress using scanning electron microscopy (SEM). The adsorption and fixation characteristics of Cd in the root and leaf cell wall were studied by chemical modification, adsorption kinetics, and Fourier transform infrared spectroscopy (FTIR). The results of SEM showed that under Cd stress, the structure of root and leaf tissues was irregularly arranged, and crystals blocked the vessels. The cortical tissue of C. canadensis was an important site for the adsorption and fixation of Cd. The adsorption kinetics test showed that the cumulative adsorptive capacity of the root cell walls for Cd was reduced by 49.1%, 38.5%, and 26.1% after esterification, aminomethylation, and pectinase modification, respectively. That of the leaf cell walls was also reduced, by 39.47%, 20.14%, and 30.23%, respectively. Carboxyl and amino groups in the root cell wall contributed greatly to Cd adsorption, while carboxyl and pectin in the leaf cell wall played a significant role. The functional group information of Cd adsorption sites on the root and leaf cell wall was characterized by FTIR, and the results showed that hydroxyl, carboxyl, and amino groups were the main binding sites. During this process, pectin provided the hydroxyl functional groups for the binding of Cd, cellulose and hemicellulose provided the carboxyl functional groups, and cell wall proteins provided the amino functional groups and other binding sites. It can be concluded that hydroxyl, carboxyl, and amino groups are the main binding sites of Cd, which results in the cell wall showing a higher adsorption and fixation ability for Cd, and is an important mechanism of Cd tolerance in C. canadensis. |
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