1
|
Zhai Q, Zheng S, Zhang C, Lu Z, Liang S, Li R, Zhang X, Pan H, Zhang H. Kj-mhpC Enzyme in Klebsiella jilinsis 2N3 Is Involved in the Degradation of Chlorimuron-Ethyl via De-Esterification. J Agric Food Chem 2024; 72:5176-5184. [PMID: 38417018 DOI: 10.1021/acs.jafc.3c08918] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/01/2024]
Abstract
Microbial degradation is a highly efficient and reliable approach for mitigating the contamination of sulfonylurea herbicides, such as chlorimuron-ethyl, in soil and water. In this study, we aimed to assess whether Kj-mhpC plays a pivotal role in the degradation of chlorimuron-ethyl. Kj-mhpC enzyme purified via prokaryotic expression exhibited the highest catalytic activity for chlorimuron-ethyl at 35 °C and pH 7. Bioinformatic analysis and three-dimensional homologous modeling of Kj-mhpC were conducted. Additionally, the presence of Mg+ and Cu2+ ions partially inhibited but Pb2+ ions completely inhibited the enzymatic activity of Kj-mhpC. LC/MS revealed that Kj-mhpC hydrolyzes the ester bond of chlorimuron-ethyl, resulting in the formation of 2-(4-chloro-6-methoxypyrimidine-2-amidoformamidesulfonyl) benzoic acid. Furthermore, the point mutation of serine at position 67 (Ser67) confirmed that it is the key amino acid at the active site for degrading chlorimuron-ethyl. This study enhanced the understanding of how chlorimuron-ethyl is degraded by microorganisms and provided a reference for bioremediation of the environment polluted with chlorimuron-ethyl.
Collapse
Affiliation(s)
- Qianhang Zhai
- College of Plant Protection, Jilin Agricultural University, Changchun 130118, China
| | - Shuanglan Zheng
- College of Plant Protection, Jilin Agricultural University, Changchun 130118, China
| | - Cheng Zhang
- College of Plant Protection, Jilin Agricultural University, Changchun 130118, China
| | - Zhou Lu
- College of Plant Protection, Jilin Agricultural University, Changchun 130118, China
| | - Shuang Liang
- College of Plant Protection, Jilin Agricultural University, Changchun 130118, China
| | - Ranhong Li
- College of Plant Protection, Jilin Agricultural University, Changchun 130118, China
| | - Xianghui Zhang
- College of Plant Science, Jilin University, Changchun 130118, China
| | - Hongyu Pan
- College of Plant Science, Jilin University, Changchun 130118, China
| | - Hao Zhang
- College of Plant Protection, Jilin Agricultural University, Changchun 130118, China
| |
Collapse
|
2
|
Hu XY, Hua ZW, Yao LG, Du L, Niu QH, Li YY, Yan L, Chen ZJ, Zhang H. [Effects of Combined Stress of High Density Polyethylene Microplastics and Chlorimuron-ethyl on Soybean Growth and Rhizosphere Bacterial Community]. Huan Jing Ke Xue 2024; 45:1161-1172. [PMID: 38471953 DOI: 10.13227/j.hjkx.202304023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 03/14/2024]
Abstract
With the vigorous development of agriculture in China, plastic mulch film and pesticides are widely used in agricultural production. However, the accumulation of microplastics (formed by the degradation of plastic mulch film) and pesticides in soil has also caused many environmental problems. At present, the environmental biological effects of microplastics or pesticides have been reported, but there are few studies on the combined effects on crop growth and the rhizosphere soil bacterial community. Therefore, in this study, the high density polyethylene microplastics (HDPE, 500 mesh) were designed to be co-treated with sulfonylurea herbicide chlorimuron-ethyl to study their effects on soybean growth. In addition, the effects of the combined stress of HDPE and chlorimuron-ethyl on soybean rhizosphere soil bacterial community diversity, structure composition, microbial community network, and soil function were investigated using high-throughput sequencing technology, interaction network, and PICRUSt2 function analysis to clarify the combined toxicity of HDPE and chlorimuron-ethyl to soybean. The results showed that the half-life of chlorimuron-ethyl in soil was prolonged by the 1% HDPE treatment (from 11.5 d to 14.3 d), and the combined stress of HDPE and chlorimuron-ethyl had more obvious inhibition effects on soybean growth than that of the single pollutant or control. The HiSeq 2 500 sequencing showed that the rhizosphere bacterial community of soybean was composed of 20 phyla and 312 genera under combined stress, the number of phyla and genera was significantly less than that of the control and single pollutant treatment, and the relative abundances of bacteria with potential biological control and plant growth-promoting characteristics (such as Nocardioides and Sphingomonas) were reduced. Alpha diversity analysis showed that the combined stress significantly reduced the richness and diversity of the soybean rhizosphere bacterial community, and Beta diversity analysis showed that the combined stress significantly changed the structure of the bacterial community. The dominant flora of the rhizosphere bacterial community were regulated, and the abundances of secondary functional layers such as amino acid metabolism, energy metabolism, and lipid metabolism were reduced under combined stress by the analysis of LEfSe and PICRUSt2. It was inferred from the network analysis that the combined stress of HDPE and chlorimuron-ethyl reduced the total number of connections and network density of soil bacteria, simplified the network structure, and changed the important flora species to maintain the stability of the network. The results above indicated that the combined stress of HDPE and chlorimuron-ethyl significantly affected the growth of soybean and changed the rhizosphere bacterial community structure, soil function, and network structure. Compared with that of the single pollutant treatment, the potential risk of combined stress was greater. The results of this study can provide guidance for evaluating the ecological risks of polyethylene microplastics and chlorimuron-ethyl and for the remediation of contaminated soil.
Collapse
Affiliation(s)
- Xiao-Yue Hu
- School of Life Science and Agricultural Engineering, Research Center of Henan Provincial Agricultural Biomass Resource Engineering and Technology, Henan Province Artemisiae argyi Development and Utilization Engineering Technology Research Center, Innovation Center of Water Security for Water Source Region of Mid-Route Project of SouthNorth Water Diversion of Henan Province, Nanyang Normal University, Nanyang 473061, China
| | - Zi-Wei Hua
- School of Life Science and Agricultural Engineering, Research Center of Henan Provincial Agricultural Biomass Resource Engineering and Technology, Henan Province Artemisiae argyi Development and Utilization Engineering Technology Research Center, Innovation Center of Water Security for Water Source Region of Mid-Route Project of SouthNorth Water Diversion of Henan Province, Nanyang Normal University, Nanyang 473061, China
| | - Lun-Guang Yao
- School of Life Science and Agricultural Engineering, Research Center of Henan Provincial Agricultural Biomass Resource Engineering and Technology, Henan Province Artemisiae argyi Development and Utilization Engineering Technology Research Center, Innovation Center of Water Security for Water Source Region of Mid-Route Project of SouthNorth Water Diversion of Henan Province, Nanyang Normal University, Nanyang 473061, China
| | - Li Du
- School of Water Resources and Environmental Engineering, Nanyang Normal University, Nanyang 473061, China
| | - Qiu-Hong Niu
- School of Life Science and Agricultural Engineering, Research Center of Henan Provincial Agricultural Biomass Resource Engineering and Technology, Henan Province Artemisiae argyi Development and Utilization Engineering Technology Research Center, Innovation Center of Water Security for Water Source Region of Mid-Route Project of SouthNorth Water Diversion of Henan Province, Nanyang Normal University, Nanyang 473061, China
| | - Yu-Ying Li
- School of Water Resources and Environmental Engineering, Nanyang Normal University, Nanyang 473061, China
| | - Lu Yan
- School of Water Resources and Environmental Engineering, Nanyang Normal University, Nanyang 473061, China
| | - Zhao-Jin Chen
- School of Water Resources and Environmental Engineering, Nanyang Normal University, Nanyang 473061, China
| | - Hao Zhang
- School of Life Science and Agricultural Engineering, Research Center of Henan Provincial Agricultural Biomass Resource Engineering and Technology, Henan Province Artemisiae argyi Development and Utilization Engineering Technology Research Center, Innovation Center of Water Security for Water Source Region of Mid-Route Project of SouthNorth Water Diversion of Henan Province, Nanyang Normal University, Nanyang 473061, China
| |
Collapse
|
3
|
Yang F, Zhang R, Xiao Y, Liu C, Fu H. [Isolation and identification of a chlorimuron-ethyl-degrading bacterium and optimization of its degradation conditions]. Sheng Wu Gong Cheng Xue Bao 2020; 36:560-568. [PMID: 32237549 DOI: 10.13345/j.cjb.190371] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
In order to solve the problem of soil, water pollution and sensitive crop drug damage caused by chlorosulfuron residue, and to provide degradation strain resources for microbial remediation of contaminated soil, a chlorimuron-ethyl-degrading strain T9DB-01 was isolated from chlorosulfuron contaminated soil by the method of enrichment culture and step by step domestication. Strain T9DB-01 was identified as Pseudomonas sp. by morphological characteristics, physiological and biochemical analysis and 16S rDNA gene sequence analysis. The effects of temperature, pH value, substrate concentration, medium volume, and inoculation volume on the degradation of chlorsulfuron-methyl by strain T9DB-01 were investigated by single factor experiment. The degradation conditions of chlorosulfuron by strain T9DB-01 were optimized by orthogonal test and verification. Results show that 30 °C, pH 8.0, inoculum 4%, liquid volume 100 mL/250 mL, substrate concentration of 200 mg/L, cultured for 5 d, the strain degraded 93.7% chlorsulfuron-methyl. The degrading strain has certain application potential for bioremediation of chlorsulfuron-contaminated soil.
Collapse
Affiliation(s)
- Fengshan Yang
- Engineering Research Center of Agricultural Microbiology Technology, Ministry of Education, Heilongjiang University, Harbin 150500, Heilongjiang, China.,Heilongjiang Provincial Key Laboratory of Ecological Restoration and Resource Utilization for Cold Region, School of Life Sciences, Heilongjiang University, Harbin 150080, Heilongjiang, China.,Key Laboratory of Molecular Biology, College of Heilongjiang Province, School of Life Sciences, Heilongjiang University, Harbin 150080, Heilongjiang, China
| | - Rui Zhang
- Engineering Research Center of Agricultural Microbiology Technology, Ministry of Education, Heilongjiang University, Harbin 150500, Heilongjiang, China.,Heilongjiang Provincial Key Laboratory of Ecological Restoration and Resource Utilization for Cold Region, School of Life Sciences, Heilongjiang University, Harbin 150080, Heilongjiang, China.,Key Laboratory of Molecular Biology, College of Heilongjiang Province, School of Life Sciences, Heilongjiang University, Harbin 150080, Heilongjiang, China
| | - Yanchen Xiao
- Engineering Research Center of Agricultural Microbiology Technology, Ministry of Education, Heilongjiang University, Harbin 150500, Heilongjiang, China.,Heilongjiang Provincial Key Laboratory of Ecological Restoration and Resource Utilization for Cold Region, School of Life Sciences, Heilongjiang University, Harbin 150080, Heilongjiang, China.,Key Laboratory of Molecular Biology, College of Heilongjiang Province, School of Life Sciences, Heilongjiang University, Harbin 150080, Heilongjiang, China
| | - Chunguang Liu
- Engineering Research Center of Agricultural Microbiology Technology, Ministry of Education, Heilongjiang University, Harbin 150500, Heilongjiang, China.,Heilongjiang Provincial Key Laboratory of Ecological Restoration and Resource Utilization for Cold Region, School of Life Sciences, Heilongjiang University, Harbin 150080, Heilongjiang, China.,Key Laboratory of Molecular Biology, College of Heilongjiang Province, School of Life Sciences, Heilongjiang University, Harbin 150080, Heilongjiang, China
| | - Haiyan Fu
- Engineering Research Center of Agricultural Microbiology Technology, Ministry of Education, Heilongjiang University, Harbin 150500, Heilongjiang, China.,Heilongjiang Provincial Key Laboratory of Ecological Restoration and Resource Utilization for Cold Region, School of Life Sciences, Heilongjiang University, Harbin 150080, Heilongjiang, China.,Key Laboratory of Molecular Biology, College of Heilongjiang Province, School of Life Sciences, Heilongjiang University, Harbin 150080, Heilongjiang, China
| |
Collapse
|
4
|
Zang H, Liu W, Cheng Y, Wang H, An X, Sun S, Wang Y, Hou N, Cui C, Li C. Bioremediation of Historically Chlorimuron-Ethyl-Contaminated Soil by Co-Culture Chlorimuron-Ethyl-Degrading Bacteria Combined with the Spent Mushroom Substrate. Microorganisms 2020; 8:E369. [PMID: 32151071 DOI: 10.3390/microorganisms8030369] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Revised: 03/01/2020] [Accepted: 03/02/2020] [Indexed: 11/17/2022] Open
Abstract
In this study, a novel chlorimuron-ethyl-degrading Pleurotus eryngiu-SMS-CB was successfully constructed for remediation of soil historically contaminated with chlorimuron-ethyl. The P. eryngiu-SMS-CB was prepared using efficient chlorimuron-ethyl-degrading cocultured bacteria, Rhodococcus sp. D310-1 and Enterobacter sp. D310-5, with spent mushroom substrate (SMS, a type of agricultural waste containing laccase) of Pleurotus eryngiu as a carrier. The chlorimuron-ethyl degradation efficiency in historically chlorimuron-ethyl-contaminated soil reached 93.1% at the end of 80 days of treatment with the P. eryngiu-SMS-CB. Although the P. eryngiu-SMS-CB altered the microbial community structure at the beginning of the 80 days, the bacterial population slowly recovered after 180 days; thus, the P. eryngiu-SMS-CB does not have an excessive effect on the long-term microbial community structure of the soil. Pot experiments indicated that contaminated soil remediation with P. eryngiu-SMS-CB reduced the toxic effects of chlorimuron-ethyl on wheat. This paper is the first to attempt to use chlorimuron-ethyl-degrading bacterial strains adhering to P. eryngiu-SMS to remediate historically chlorimuron-ethyl-contaminated soil, and the microbial community structure and P. eryngiu-SMS-CB activity in chlorimuron-ethyl-contaminated soil were traced in situ to evaluate the long-term effects of this remediation.
Collapse
|
5
|
Zhang H, Chen F, Zhao HZ, Lu JS, Zhao MJ, Hong Q, Huang X. Colonization on Cucumber Root and Enhancement of Chlorimuron-ethyl Degradation in the Rhizosphere by Hansschlegelia zhihuaiae S113 and Root Exudates. J Agric Food Chem 2018; 66:4584-4591. [PMID: 29672047 DOI: 10.1021/acs.jafc.8b00041] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The colonization of Hansschlegelia zhihuaiae S113 and its degradation of the herbicide chlorimuron-ethyl in the cucumber rhizosphere was investigated. The results reveal that S113 colonized the cucumber roots (2.14 × 105cells per gram of roots) and were able to survive in the rhizosphere (maintained for 20 d). The root exudates promoted colonization on roots and increased the degradation of chlorimuron-ethyl by S113. Five organic acids in cucumber-root exudates were detected and identified by HPLC. Citric acid and fumaric acid significantly stimulated S113 colonization on cucumber roots, with 18.4 and 15.5% increases, respectively, compared with the control. After irrigation with an S113 solution for 10 days, chlorimuron-ethyl could not be detected in the roots, seedlings, or rhizosphere soil, which allowed for improved cucumber growth. Therefore, the degradation mechanism of chlorimuron-ethyl residues by S113 in the rhizosphere could be applied in situ for the bioremediation of chlorimuron-ethyl contaminated soil to ensure crop safety.
Collapse
Affiliation(s)
- Hao Zhang
- College of Life Sciences , Nanjing Agricultural University , Nanjing 210095 , PR China
- School of Life Science and Technology , Nanyang Normal University , Nanyang 473061 , PR China
| | - Feng Chen
- College of Life Sciences , Nanjing Agricultural University , Nanjing 210095 , PR China
| | - Hua-Zhu Zhao
- College of Life Sciences , Nanjing Agricultural University , Nanjing 210095 , PR China
| | - Jia-Sen Lu
- College of Life Sciences , Nanjing Agricultural University , Nanjing 210095 , PR China
| | - Meng-Jun Zhao
- College of Life Sciences , Nanjing Agricultural University , Nanjing 210095 , PR China
| | - Qing Hong
- College of Life Sciences , Nanjing Agricultural University , Nanjing 210095 , PR China
| | - Xing Huang
- College of Life Sciences , Nanjing Agricultural University , Nanjing 210095 , PR China
| |
Collapse
|