Identification of a novel heavy metal resistant Ralstonia strain and its growth response to cadmium exposure
文献类型： 外文期刊
作者： Huang, Jiaqing 1 ; Liu, Cenwei 1 ; Price, G. W. 3 ; Li, Yanchun 1 ; Wang, Yixiang 1 ;
作者机构： 1.Fujian Acad Agr Sci FAAS, Agr Ecol Inst, Fuzhou 350013, Peoples R China
2.Fujian Key Lab Agr Ecol Proc Red Soil Mt, Fuzhou 350013, Peoples R China
3.Dalhousie Univ, Dept Engn, Truro, NS B2N 5E3, Canada
关键词： Ralstonia Bcul-1; Cadmium adsorption; Heavy metal resistance gene; Bioremediation; Biochar
期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：10.588； 五年影响因子：10.129 ）
ISSN： 0304-3894
年卷期： 2021 年 416 卷
页码：
收录情况： SCI
摘要： A novel Ralstonia Bcul-1 strain was isolated from soil samples that was closest to Ralstonia pickettii. Broadspectrum resistance was identified to a group of heavy metal ions and tolerance to concentrations of Cd2+ up to 400 mg L-1. Low concentrations of heavy metal ions did not have distinctive impact on heavy metal resistance genes and appeared to induce greater expression. Under exposure to Cd2+, cell wall components were significantly enhanced, and some proteins were also simultaneously expressed allowing the bacteria to adapt to the high Cd2+ living environment. The maximum removal rate of Cd2+ by the Ralstonia Bcul-1 strain was 78.97% in the culture medium supplemented with 100 mg L-1 Cd2+. Ralstonia Bcul-1 was able to survive and grow in a low nutrient and cadmium contaminated (0.42 mg kg-1) vegetable soil, and the cadmium removal rate was up to 65.76% in 9th growth. Ralstonia Bcul-1 mixed with biochar could maintain sustainable growth of this strain in the soil up to 75 d and the adsorption efficiency of cadmium increased by 16.23-40.80% as compared to biochar application alone. Results from this work suggests that Ralstonia Bcul-1 is an ideal candidate for bioremediation of nutrient deficient heavy metal contaminated soil.
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