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| Effect of cadmium-tolerant and immobilizing bacteria on cadmium uptake in different wheat cultivars |
| Received:March 16, 2020 |
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| KeyWord:cadmium-tolerant and -immobilizing bacteria;adsorption;cadmium accumulation;wheat |
| Author Name | Affiliation | E-mail | | SUN Le-ni | School of Life Science, Anhui Agricultural University, Hefei 230036, China | | | GUO Ying-xue | School of Life Science, Anhui Agricultural University, Hefei 230036, China | | | HOU Xue-ting | School of Life Science, Anhui Agricultural University, Hefei 230036, China | | | ZHUANG Jie | School of Life Science, Anhui Agricultural University, Hefei 230036, China | | | YANG Zhang-ze | School of Life Science, Anhui Agricultural University, Hefei 230036, China | | | CHEN Zhao-jin | School of Agricultural Engineering, Nanyang Normal University, Nanyang 473061, China | zhaojin_chen@163.com | | TIAN Wei | Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China | |
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| Abstract: |
| In order to explore the effect of heavy metal-tolerant and -immobilizing bacteria on heavy metal accumulation in wheat, Cd-tolerant and -immobilizing bacteria were screened from rhizosphere soil. The adsorption characteristics and effect of inoculation with the strain on cadmium content, bioaccumulation, and transfer factor in two wheat cultivars were assessed. The results showed Cd-tolerant and -immobilizing bacteria strain YM4, which was identified as Pseudomonas sp. YM4, could grow at high Cd2+ concentration(225 mg·L-1) and reduce the concentrations of water-soluble Cd in the solution by 58.9%. Extracellular adsorption was the main mode for Cd removal. Infrared spectrum analysis showed that the functional groups involved in the biosorption process mainly included -OH, -NH, carboxyl groups, and -PO4. In the pot experiment, YM4 significantly reduced the accumulation of Cd(11.31%~46.05%, 10.12%~42.22%)in the upper parts of the wheat(straw and husk), especially the grains(red wheat:26.79%~62.24% and white wheat:25.27%~28.99%). YM4 significantly reduced the accumulation coefficients of the straw, grain, and husk as well as the transfer coefficients of the grain in the two wheat varieties. In summary, Cd-tolerant and -immobilizing bacteria Pseudomonas sp. YM4 can reduce the content of Cd in wheat grain, prevent its accumulation in wheat,and provide important bacterial resources for safe crop production in moderately and mildly Cd-contaminated soil. |
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