Cadmium Pollution Impact on the Bacterial Community Structure of Arable Soil and the Isolation of the Cadmium Resistant Bacteria

• DOI: 10.3389/fmicb.2021.698834
• Publication Date: 2021-07-22T11:45:07Z
• Authors: Xiaoxia Yu; JinTong Zhao; Xiaoqing Liu; LiXin Sun; Jian Tian; Ningfeng Wu
• Keywords: bioremediation; 13. Climate action; cadmium pollution; bacterial diversity; Microbiology; 01 natural sciences; seasonal change; Cd-resistant bacteria; QR1-502; 6. Clean water; 0105 earth and related environmental sciences

Microorganisms play an important role in the remediation of cadmium pollution soil and their diversity can be affected by cadmium. In this study, bacterial community arable samples collected from two near geographical sites, with different degrees at three seasons, were characterized using Illumina MiSeq sequencing. The result showed that is factor to affect microbial communities high polluted area (the site H) had significant differences compared low L). Especially, higher concentrations Cd significantly increased abundance Proteobacteria Gemmatimonas whereas decreased Nitrospirae. Moreover, 42 Cd-resistant bacteria isolated six evaluated for potential application bioremediation. Based on Cd-MIC [minimum inhibitory concentration (MIC) 2+ ], removal rate 16S rDNA gene sequence analyses, Burkholderia sp. strains (ha-1, hj-2, ho-3) very tolerance (5, 5, 6 mM) exhibited (81.78, 79.37, 63.05%), Bacillus (151-5,151-6,151-13, 151-20, 151-21) moderate (0.8, 0.4, 0.8, 0.6, 0.4 but (84.78, 90.14, 82.82, 82.39, 81.79, 84.17%). Those results indicated belonging phylum Firmicutes have developed a resistance may Cd-contaminated soils. Our study provided baseline data soils concluded bioremediation