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Araujo ASF, Pertile M, Costa RM, Costa MKL, de Aviz RO, Mendes LW, de Medeiros EV, da Costa DP, Melo VMM, Pereira APDA. Short-term responses of plant growth-promoting bacterial community to the herbicides imazethapyr and flumioxazin. CHEMOSPHERE 2023; 328:138581. [PMID: 37019406 DOI: 10.1016/j.chemosphere.2023.138581] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Revised: 03/15/2023] [Accepted: 03/31/2023] [Indexed: 06/19/2023]
Abstract
Imazethapyr and flumioxazin are widely recommended herbicides for soybean fields due to their broad-spectrum effects. However, although both herbicides present low persistence, their potential impact on the community of plant growth-promoting bacteria (PGPB) is unclear. To address this gap, this study assessed the short-term effect of imazethapyr, flumioxazin, and their mixture on the PGPB community. Soil samples from soybean fields were treated with these herbicides and incubated for 60 days. We extracted soil DNA at 0, 15, 30, and 60 days and sequenced the 16S rRNA gene. In general, the herbicides presented temporary and short-term effects on PGPB. The relative abundance of Bradyrhizobium increased, while Sphingomonas decreased on the 30th day with the application of all herbicides. Both herbicides increased the potential function of nitrogen fixation at 15th days and decreased at 30th and 60th days of incubation. The proportions of generalists were similar (∼42%) comparing each herbicide and the control, while the proportion of specialists increased (varying from 24.9% to 27.6%) with the application of herbicides. Imazethapyr, flumioxazin and their mixture did not change the complexity and interactions of the PGPB network. In conclusion, this study showed that, in the short term, the application of imazethapyr, flumioxazin, and their mixture, at the recommended field rates, does not negatively affect the community of plant growth-promoting bacteria.
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Affiliation(s)
| | - Mariane Pertile
- Soil Quality Lab., Agricultural Science Center, Federal University of Piauí, Teresina, PI Brazil
| | - Romário Martins Costa
- Soil Quality Lab., Agricultural Science Center, Federal University of Piauí, Teresina, PI Brazil
| | | | - Rhaiana Oliveira de Aviz
- Soil Quality Lab., Agricultural Science Center, Federal University of Piauí, Teresina, PI Brazil
| | - Lucas William Mendes
- Center for Nuclear Energy in Agriculture, University of Sao Paulo CENA-USP, Piracicaba, SP Brazil
| | - Erika Valente de Medeiros
- Laboratory of Microbiology and Enzymology-LEMA, Federal University of Agreste Pernambuco, Garanhuns 55292-270, Brazil
| | - Diogo Paes da Costa
- Laboratory of Microbiology and Enzymology-LEMA, Federal University of Agreste Pernambuco, Garanhuns 55292-270, Brazil
| | - Vania Maria Maciel Melo
- Laboratório de Ecologia Microbiana e Biotecnologia, Federal University of Ceara, Fortaleza, CE Brazil
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Zheng L, Seidi F, Liu Y, Wu W, Xiao H. Polymer-based and stimulus-responsive carriers for controlled release of agrochemicals. Eur Polym J 2022. [DOI: 10.1016/j.eurpolymj.2022.111432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Yudistira H, Geddes BA, Geddes CM, Gulden RH, Oresnik IJ. qPCR assay targeting Bradyrhizobium japonicum shows that row spacing and soybean density affects Bradyrhizobium population. Can J Microbiol 2021; 67:529-536. [PMID: 33049159 DOI: 10.1139/cjm-2020-0334] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The ability for a soybean plant to be efficiently nodulated when grown as a crop is dependent on the number of effective Bradyrhizobium japonicum that can be found in close proximity to the developing seedling shortly after planting. In Manitoba, the growing of soybean as a crop has increased from less than 500 000 acres in 2008 to over 2.3 million acres in 2017. Since the large increase in soybean production is relatively recent, populations of B. japonicum have not yet developed. In response to this, we developed a primer pair that can identify B. japonicum, and be used to determine the titre found in field soil. Their utility was demonstrated by being used to determine whether row spacing of soybean affects B. japonicum populations, as well as to follow B. japonicum populations in a soybean field over the course of a field season. The data show that plant density can affect B. japonicum populations. Moreover, evidence is presented that suggests plant development affects overall B. japonicum populations.
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Affiliation(s)
- Harry Yudistira
- Department of Microbiology, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
| | - Barney A Geddes
- Department of Microbiology, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
| | - Charles M Geddes
- Department of Plant Science, University of Manitoba, Winnipeg, MB R3T 2N2 Canada
| | - Robert H Gulden
- Department of Plant Science, University of Manitoba, Winnipeg, MB R3T 2N2 Canada
| | - Ivan J Oresnik
- Department of Microbiology, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
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Bourdineaud JP. Toxicity of the herbicides used on herbicide-tolerant crops, and societal consequences of their use in France. Drug Chem Toxicol 2020; 45:698-721. [PMID: 32543998 DOI: 10.1080/01480545.2020.1770781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
In France, the implementation of mutant herbicide-tolerant crops and the use of the related herbicides - sulfonylureas and imidazolinones - have triggered a strong societal reaction illustrated by the intervening actions of environmentalist groups illegally mowing such crops. Trials are in progress, and therefore should be addressed the questions of the environmental risks and the toxicity of these herbicides for the animals and humans consuming the products derived from these plants. Regulatory authorities have allowed these mutant and herbicide-tolerant plants arguing that the herbicides against which they resist only target an enzyme found in 'weeds' (the acetolactate synthase, ALS), and that therefore all organisms lacking this enzyme would be endowed with immunity to these herbicides. The toxicological literature does not match with this argument: 1) Even in organisms displaying the enzyme ALS, these herbicides impact other molecular targets than ALS; 2) These herbicides are toxic for animals, organisms that do not possess the enzyme ALS, and especially invertebrates, amphibians and fish. In humans, epidemiological studies have shown that the use and handling of these toxins are associated with a significantly increased risk of colon and bladder cancers, and miscarriages. In agricultural soils, these herbicides have a persistence of up to several months, and water samples have concentrations of some of these herbicides above the limit value in drinking water.
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Affiliation(s)
- Jean-Paul Bourdineaud
- Laboratory of Fundamental Microbiology and Pathogenicity, European Institute of Chemistry and Biology, CNRS, University of Bordeaux, Pessac, France.,CRIIGEN, Paris, France
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Yang L, Li X, Li X, Su Z, Zhang C, Zhang H. Microbial community dynamics during the bioremediation process of chlorimuron-ethyl-contaminated soil by Hansschlegelia sp. strain CHL1. PLoS One 2015; 10:e0117943. [PMID: 25689050 PMCID: PMC4331280 DOI: 10.1371/journal.pone.0117943] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2014] [Accepted: 01/05/2015] [Indexed: 11/18/2022] Open
Abstract
Long-term and excessive application of chlorimuron-ethyl has led to a series of environmental problems. Strain Hansschlegelia sp. CHL1, a highly efficient chlorimuron-ethyl degrading bacterium isolated in our previous study, was employed in the current soil bioremediation study. The residues of chlorimuron-ethyl in soils were detected, and the changes of soil microbial communities were investigated by phospholipid fatty acid (PLFA) analysis. The results showed that strain CHL1 exhibited significant chlorimuron-ethyl degradation ability at wide range of concentrations between 10μg kg-1 and 1000μg kg-1. High concentrations of chlorimuron-ethyl significantly decreased the total concentration of PLFAs and the Shannon-Wiener indices and increased the stress level of microbes in soils. The inoculation with strain CHL1, however, reduced the inhibition on soil microbes caused by chlorimuron-ethyl. The results demonstrated that strain CHL1 is effective in the remediation of chlorimuron-ethyl-contaminated soil, and has the potential to remediate chlorimuron-ethyl contaminated soils in situ.
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Affiliation(s)
- Liqiang Yang
- State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Xinyu Li
- State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China
| | - Xu Li
- State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China
| | - Zhencheng Su
- State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China
| | - Chenggang Zhang
- State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China
| | - Huiwen Zhang
- State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China
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Xu J, Zhang Y, Dong F, Liu X, Wu X, Zheng Y. Effects of repeated applications of chlorimuron-ethyl on the soil microbial biomass, activity and microbial community in the greenhouse. BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2014; 92:175-182. [PMID: 24264144 DOI: 10.1007/s00128-013-1156-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2013] [Accepted: 11/06/2013] [Indexed: 06/02/2023]
Abstract
The impacts of repeated chlorimuron-ethyl applications on soil microbial community structure and function were studied under greenhouse conditions. Chlorimuron-ethyl was applied to soil samples at three different doses [1-,10-,100-fold of recommended field rate (T1, T10, T100)] for 3 years. The half-lives of chlorimuron-ethyl were 37.1-54.6 days. The soil microbial biomass (microbial biomass carbon and total phospholipid fatty acid), the microbial activity (basal respiration and average well color development), the ratio of Gram-negative/Gram-positive bacteria and Shannon index were stimulated by chlorimuron-ethyl during the initial period. Except for T100, the other treatments recovered to the untreated level. The ratio of fungi/bacteria decreased during the initial period and then recovered in the end. Principal component analysis of phospholipid fatty acid showed that chlorimuron-ethyl altered the microbial community structure. Except got T100, T1 and T10 were not different from the control at the end of experiment. These results suggested a dosage effect of chlorimuron-ethyl on the living microbial biomass and the microbial community.
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Affiliation(s)
- Jun Xu
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
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