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Danilova IV, Rudakova NL, Vasilyeva YA, Gilmutdinova AI, Diadkina IV, Khasanov DI, Sharipova MR. Optimization of Electroporation Conditions for Bacillus pumilus 3–19 Strain. BIONANOSCIENCE 2022. [DOI: 10.1007/s12668-022-00982-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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He P, Li S, Xu S, Fan H, Wang Y, Zhou W, Fu G, Han G, Wang YY, Zheng SJ. Monitoring Tritrophic Biocontrol Interactions Between Bacillus spp., Fusarium oxysporum f. sp. cubense, Tropical Race 4, and Banana Plants in vivo Based on Fluorescent Transformation System. Front Microbiol 2021; 12:754918. [PMID: 34721361 PMCID: PMC8550332 DOI: 10.3389/fmicb.2021.754918] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2021] [Accepted: 09/22/2021] [Indexed: 11/27/2022] Open
Abstract
Bacillus spp. is effective biocontrol agents for Fusarium wilt of banana (FWB), tropical race 4 (TR4). This study explores the colonization by Bacillus subtilis, Bacillus velezensis, and Bacillus amyloliquefaciens of host banana plants and elucidates the mechanism of antagonistic TR4 biocontrol. The authors selected one B. subtilis strain, three B. velezensis strains, and three B. amyloliquefaciens strains that are proven to significantly inhibit TR4 in vitro, optimized the genetic transformation conditions and explored their colonization process in banana plants. The results showed that we successfully constructed an optimized fluorescent electro-transformation system (OD600 of bacteria concentration=0.7, plasmid concentration=50ng/μl, plasmid volume=2μl, transformation voltage=1.8kV, and transformation capacitance=400Ω) of TR4-inhibitory Bacillus spp. strains. The red fluorescent protein (RFP)-labeled strains were shown to have high stability with a plasmid-retention frequency above 98%, where bacterial growth rates and TR4 inhibition are unaffected by fluorescent plasmid insertion. In vivo colonizing observation by Laser Scanning Confocal Microscopy (LSCM) and Scanning Electron Microscopy (SEM) showed that Bacillus spp. can colonize the internal cells of banana plantlets roots. Further, fluorescent observation by LSCM showed these RFP-labeled bacteria exhibit chemotaxis (chemotaxis ratio was 1.85±0.04) toward green fluorescent protein (GFP)-labeled TR4 hyphae in banana plants. We conclude that B. subtilis, B. velezensis, and B. amyloliquefaciens can successfully colonize banana plants and interact with TR4. Monitoring its dynamic interaction with TR4 and its biocontrol mechanism is under further study.
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Affiliation(s)
- Ping He
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Ministry of Education Key Laboratory of Agriculture Biodiversity for Plant Disease Management, College of Plant Protection, Yunnan Agricultural University, Kunming, China.,Yunnan Key Laboratory of Green Prevention and Control of Agricultural Transboundary Pests, Agricultural Environment and Resources Institute, Yunnan Academy of Agricultural Sciences, Kunming, China
| | - Shu Li
- Yunnan Key Laboratory of Green Prevention and Control of Agricultural Transboundary Pests, Agricultural Environment and Resources Institute, Yunnan Academy of Agricultural Sciences, Kunming, China
| | - Shengtao Xu
- Yunnan Key Laboratory of Green Prevention and Control of Agricultural Transboundary Pests, Agricultural Environment and Resources Institute, Yunnan Academy of Agricultural Sciences, Kunming, China
| | - Huacai Fan
- Yunnan Key Laboratory of Green Prevention and Control of Agricultural Transboundary Pests, Agricultural Environment and Resources Institute, Yunnan Academy of Agricultural Sciences, Kunming, China
| | - Yongfen Wang
- Yunnan Key Laboratory of Green Prevention and Control of Agricultural Transboundary Pests, Agricultural Environment and Resources Institute, Yunnan Academy of Agricultural Sciences, Kunming, China.,Institute of Tropical and Subtropical Industry Crops, Yunnan Academy of Agricultural Sciences, Baoshan, China
| | - Wei Zhou
- Biotechnology Research Institute, Guangxi Academy of Agricultural Sciences, Nanning, China
| | - Gang Fu
- Institute of Plant Protection, Guangxi Academy of Agricultural Sciences, Nanning, China
| | - Guangyu Han
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Ministry of Education Key Laboratory of Agriculture Biodiversity for Plant Disease Management, College of Plant Protection, Yunnan Agricultural University, Kunming, China
| | - Yun-Yue Wang
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Ministry of Education Key Laboratory of Agriculture Biodiversity for Plant Disease Management, College of Plant Protection, Yunnan Agricultural University, Kunming, China
| | - Si-Jun Zheng
- Yunnan Key Laboratory of Green Prevention and Control of Agricultural Transboundary Pests, Agricultural Environment and Resources Institute, Yunnan Academy of Agricultural Sciences, Kunming, China.,Bioversity International, Kunming, China
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Chen Y, Liu T, Li Q, Ma Y, Cheng J, Xu L. Screening for Candidate Genes Associated with Biocontrol Mechanisms of Bacillus pumilus DX01 Using Tn5 Transposon Mutagenesis and a 2-DE-Based Comparative Proteomic Analysis. Curr Microbiol 2020; 77:3397-3408. [PMID: 32915287 DOI: 10.1007/s00284-020-02191-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Accepted: 08/28/2020] [Indexed: 12/27/2022]
Abstract
A total of 1467 mutants of the biocontrol bacterium Bacillus pumilus DX01 were obtained by Tn5 insertional mutagenesis and subjected to the determination of antagonistic capabilities. Compared with the wild-type strain DX01, the mutant M25 was identified to have the most significant reduction in antagonistic capability against the phytopathogen Bipolaris maydis and extracellular proteinase activity. The integration site of the exogenous T-DNA in the genome of mutant M25 was revealed in the coding region of malony CoA-ACP transacylase (MCAT) gene (mcat), which belongs to a polyketide synthase (PKS) gene cluster, DX01pks of B. pumilus DX01. Furthermore, the whole DX01pks gene cluster was cloned using Illumina Solexa sequencing technology, and it has a modular framework different from the other two gene clusters involved in polyketide synthesis in B. amyloliquefaciens FZB42 (pks1) and B. subtilis 168 (pksX). Finally, in order to gain more insights into the molecular mechanisms of biocontrol of B. pumilus DX01, the changes in the relative level of expression of total proteins between the original strain DX01 and the mutant M25 were detected by 2-DE-based proteomic analysis. A total of twenty differentially expressed proteins were identified upon the mcat gene transposition mutagenesis. Of these proteins, seven proteins were up-regulated in expression level and the other proteins were down-regulated. Taken together, the results in this study showed that Tn5 transposon mutagenesis of B. pumilus DX01 can lead to a significant change of antiphytopathogen ability, and the DX01pks gene cluster possibly play a potential role in the biocontrol processes of this bacterium.
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Affiliation(s)
- Yunpeng Chen
- Department of Resources and Environment, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, 200240, China.
| | - Tong Liu
- Department of Resources and Environment, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Qiongjie Li
- Department of Resources and Environment, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Yifei Ma
- Department of Resources and Environment, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Jiejie Cheng
- Department of Resources and Environment, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Lurong Xu
- Department of Resources and Environment, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, 200240, China
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The Endochitinase of Clonostachysrosea Expression in Bacillus amyloliquefaciens Enhances the Botrytis cinerea Resistance of Tomato. Int J Mol Sci 2018; 19:ijms19082221. [PMID: 30061502 PMCID: PMC6121428 DOI: 10.3390/ijms19082221] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2018] [Revised: 07/19/2018] [Accepted: 07/24/2018] [Indexed: 11/24/2022] Open
Abstract
To investigate whether the ech42 gene in Clonostachysrosea can improve the biocontrol efficacy of Bacillus amyloliquefaciens and its molecular mechanism. Compared to the wild type, the B. amyloliquefaciens transformed with the ech42 gene exhibited higher chitinase activity. The B. amyloliquefaciens-ech42 also showed significantly higher biocontrol efficiency compared to Botrytiscinerea when tomato plants were pre-treated with B. amyloliquefaciens-ech42. No significant difference in biocontrol efficiency was observed between the wild type and B.amyloliquefaciens-ech42 when tomato plants were first infected by Botrytiscinerea. In addition, the activity of the defense-related enzyme polyphenol oxidase, but not superoxide dismutase, was significantly higher in B. amyloliquefaciens-ech42 than in the wild type. The ech42 enhances the biocontrol efficiency of B.amyloliquefaciens by increasing the capacity of preventative/curative effects in plants, rather than by killing the pathogens.
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Sun S, Chen Y, Cheng J, Li Q, Zhang Z, Lan Z. Isolation, characterization, genomic sequencing, and GFP-marked insertional mutagenesis of a high-performance nitrogen-fixing bacterium, Kosakonia radicincitans GXGL-4A and visualization of bacterial colonization on cucumber roots. Folia Microbiol (Praha) 2018; 63:789-802. [PMID: 29876800 DOI: 10.1007/s12223-018-0608-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2017] [Accepted: 04/25/2018] [Indexed: 11/26/2022]
Abstract
A gram-negative bacterium GXGL-4A was originally isolated from maize roots. It displayed nitrogen-fixing (NF) ability under nitrogen-free culture condition, and had a significant promotion effect on cucumber growth in the pot inoculation test. The preliminary physiological and biochemical traits of GXGL-4A were characterized. Furthermore, a phylogenetic tree was constructed based on 16S ribosomal DNA (rDNA) sequences of genetically related species. To determine the taxonomic status of GXGL-4A and further utilize its nitrogen-fixing potential, genome sequence was obtained using PacBio RS II technology. The analyses of average nucleotide identity based on BLAST+ (ANIb) and correlation indexes of tetra-nucleotide signatures (Tetra) showed that the NF isolate GXGL-4A is closely related to the Kosakonia radicincitans type strain DSM 16656. Therefore, the isolate GXGL-4A was eventually classified into the species of Kosakonia radicincitans and designated K. radicincitans GXGL-4A. A high consistency in composition and gene arrangement of nitrogen-fixing gene cluster I (nif cluster I) was found between K. radicincitans GXGL-4A and other Kosakonia NF strains. The mutants tagged with green fluorescence protein (GFP) were obtained by transposon Tn5 mutagenesis, and then, the colonization of gfp-marked K. radicincitans GXGL-4A cells on cucumber seedling root were observed under fluorescence microscopy. The preferential sites of the labeled GXGL-4A cell population were the lateral root junctions, the differentiation zone, and the elongation zone. All these results should benefit for the deep exploration of nitrogen fixation mechanism of K. radicincitans GXGL-4A and will definitely facilitate the genetic modification process of this NF bacterium in sustainable agriculture.
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Affiliation(s)
- Shuaixin Sun
- Key Laboratory of Urban Agriculture (South) of Ministry of Agriculture, School of Agriculture and Biology, Shanghai Jiaotong University, Shanghai, 200240, People's Republic of China
| | - Yunpeng Chen
- Key Laboratory of Urban Agriculture (South) of Ministry of Agriculture, School of Agriculture and Biology, Shanghai Jiaotong University, Shanghai, 200240, People's Republic of China.
| | - Jiejie Cheng
- Key Laboratory of Urban Agriculture (South) of Ministry of Agriculture, School of Agriculture and Biology, Shanghai Jiaotong University, Shanghai, 200240, People's Republic of China
| | - Qiongjie Li
- Key Laboratory of Urban Agriculture (South) of Ministry of Agriculture, School of Agriculture and Biology, Shanghai Jiaotong University, Shanghai, 200240, People's Republic of China
| | - Zhenchuan Zhang
- Key Laboratory of Urban Agriculture (South) of Ministry of Agriculture, School of Agriculture and Biology, Shanghai Jiaotong University, Shanghai, 200240, People's Republic of China
| | - Zhengliang Lan
- Key Laboratory of Urban Agriculture (South) of Ministry of Agriculture, School of Agriculture and Biology, Shanghai Jiaotong University, Shanghai, 200240, People's Republic of China
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Wang Z, Xu G, Ma P, Lin Y, Yang X, Cao C. Isolation and Characterization of a Phosphorus-Solubilizing Bacterium from Rhizosphere Soils and Its Colonization of Chinese Cabbage ( Brassica campestris ssp. chinensis). Front Microbiol 2017; 8:1270. [PMID: 28798725 PMCID: PMC5526974 DOI: 10.3389/fmicb.2017.01270] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2017] [Accepted: 06/23/2017] [Indexed: 12/18/2022] Open
Abstract
Phosphate-solubilizing bacteria (PSB) can promote the dissolution of insoluble phosphorus (P) in soil, enhancing the availability of soluble P. Thus, their application can reduce the consumption of fertilizer and aid in sustainable agricultural development. From the rhizosphere of Chinese cabbage plants grown in Yangling, we isolated a strain of PSB (YL6) with a strong ability to dissolve P and showed that this strain promoted the growth of these plants under field conditions. However, systematic research on the colonization of bacteria in the plant rhizosphere remains deficient. Thus, to further study the effects of PSB on plant growth, in this study, green fluorescent protein (GFP) was used to study the colonization of YL6 on Chinese cabbage roots. GFP expression had little effect on the ability of YL6 to grow and solubilize P. In addition, the GFP-expressing strain stably colonized the Chinese cabbage rhizosphere (the number of colonizing bacteria in the rhizosphere soil was 4.9 lg CFU/g). Using fluorescence microscopy, we observed a high abundance of YL6-GFP bacteria at the Chinese cabbage root cap and meristematic zone, as well as in the root hairs and hypocotyl epidermal cells. High quantities of GFP-expressing bacteria were recovered from Chinese cabbage plants during different planting periods for further observation, indicating that YL6-GFP had the ability to endogenously colonize the plants. This study has laid a solid and significant foundation for further research on how PSB affects the physiological processes in Chinese cabbage to promote plant growth.
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Affiliation(s)
- Zhen Wang
- College of Life Sciences, Northwest A&F UniversityYangling, China
| | - Guoyi Xu
- College of Life Sciences, Northwest A&F UniversityYangling, China
| | - Pengda Ma
- College of Life Sciences, Northwest A&F UniversityYangling, China
| | - Yanbing Lin
- College of Life Sciences, Northwest A&F UniversityYangling, China
| | - Xiangna Yang
- College of Life Sciences, Northwest A&F UniversityYangling, China
| | - Cuiling Cao
- College of Life Sciences, Northwest A&F UniversityYangling, China
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How to transform a recalcitrant Paenibacillus strain: From culture medium to restriction barrier. J Microbiol Methods 2016; 131:135-143. [PMID: 27780731 DOI: 10.1016/j.mimet.2016.10.012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2016] [Revised: 10/11/2016] [Accepted: 10/21/2016] [Indexed: 11/20/2022]
Abstract
Paenibacillus riograndensis SBR5T is a plant growth-promoting bacterium isolated from the wheat rhizosphere. Its recalcitrance to genetic manipulation is a major bottleneck for molecular studies, as has been reported for other Paenibacillus environmental isolates. An efficient electroporation protocol was established by evaluating diverse parameters and optimizing the culture medium, culture growth phase, electroporation solution, recovery medium, DNA input, and electric field strength. Efficiencies of approximately 2.8×104transformantsμg-1 of plasmid DNA were obtained. The optimized protocol was tested with other Paenibacillus species, and the relevance of bypassing the restriction DNA defense system to transform Paenibacillus was highlighted. This protocol is the tool needed to deepen molecular studies with this strain and will aid in the manipulation of other new environmental isolates that also exhibit recalcitrant transformation difficulties.
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S. cerevisiae fermentation activity after moderate pulsed electric field pre-treatments. Bioelectrochemistry 2015; 103:92-7. [DOI: 10.1016/j.bioelechem.2014.08.016] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2014] [Revised: 07/31/2014] [Accepted: 08/12/2014] [Indexed: 12/14/2022]
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