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Yang L, Shakeel Q, Xu X, Ali L, Chen Z, Mubeen M, Sohail MA, IfItikhar Y, Kumar A, Solanki MK, Zhou Y, Zhao D, Alharbi NK, Wang J. Optimized submerged batch fermentation for metabolic switching in Streptomyces yanglinensis 3-10 providing platform for reveromycin A and B biosynthesis, engineering, and production. Front Microbiol 2024; 15:1378834. [PMID: 38784807 PMCID: PMC11112568 DOI: 10.3389/fmicb.2024.1378834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2024] [Accepted: 04/09/2024] [Indexed: 05/25/2024] Open
Abstract
The cultivation system requires that the approach providing biomass for all types of metabolic analysis is of excellent quality and reliability. This study was conducted to enhance the efficiency and yield of antifungal substance (AFS) production in Streptomyces yanglinensis 3-10 by optimizing operation conditions of aeration, agitation, carbon source, and incubation time in a fermenter. Dissolved oxygen (DO) and pH were found to play significant roles in AFS production. The optimum pH for the production of AFS in S. yanglinensis 3-10 was found to be 6.5. As the AFS synthesis is generally thought to be an aerobic process, DO plays a significant role. The synthesis of bioactive compounds can vary depending on how DO affects growth rate. This study validates that the high growth rate and antifungal activity required a minimum DO concentration of approximately 20% saturation. The DO supply in a fermenter can be raised once agitation and aeration have been adjusted. Consequently, DO can stimulate the development of bacteria and enzyme production. A large shearing effect could result from the extreme agitation, harming the cell and deactivating its products. The highest inhibition zone diameter (IZD) was obtained with 3% starch, making starch a more efficient carbon source than glucose. Temperature is another important factor affecting AFS production. The needed fermentation time would increase and AFS production would be reduced by the too-low operating temperature. Furthermore, large-scale fermenters are challenging to manage at temperatures that are far below from room temperature. According to this research, 28°C is the ideal temperature for the fermentation of S. yanglinensis 3-10. The current study deals with the optimization of submerged batch fermentation involving the modification of operation conditions to effectively enhance the efficiency and yield of AFS production in S. yanglinensis 3-10.
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Affiliation(s)
- Longyan Yang
- China Tobacco Guangxi Industrial Co., Ltd., Nanning, China
| | - Qaiser Shakeel
- Cholistan Institute of Desert Studies, Faculty of Agriculture and Environment, The Islamia University of Bahawalpur, Bahawalpur, Pakistan
| | - Xueqin Xu
- China Tobacco Guangxi Industrial Co., Ltd., Nanning, China
| | - Liaqat Ali
- Cholistan Institute of Desert Studies, Faculty of Agriculture and Environment, The Islamia University of Bahawalpur, Bahawalpur, Pakistan
| | - Zhiyan Chen
- China Tobacco Guangxi Industrial Co., Ltd., Nanning, China
| | - Mustansar Mubeen
- Department of Plant Pathology, College of Agriculture, University of Sargodha, Sargodha, Pakistan
| | - Muhammad Aamir Sohail
- National Key Laboratory of Plant Molecular Genetics, Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, China
| | - Yasir IfItikhar
- Department of Plant Pathology, College of Agriculture, University of Sargodha, Sargodha, Pakistan
| | - Ajay Kumar
- Amity Institute of Biotechnology, Amity University, Noida, Uttar Pradesh, India
| | - Manoj Kumar Solanki
- Department of Life Sciences and Biological Sciences, IES University, Bhopal, Madhya Pradesh, India
- Plant Cytogenetics and Molecular Biology Group, Institute of Biology, Biotechnology and Environmental Protection, Faculty of Natural Sciences, University of Silesia in Katowice, Katowice, Poland
| | - Yun Zhou
- China Tobacco Guangxi Industrial Co., Ltd., Nanning, China
| | - Dongling Zhao
- China Tobacco Guangxi Industrial Co., Ltd., Nanning, China
| | - Nada K. Alharbi
- Department of Biology, College of Science, Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia
| | - Jie Wang
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao, China
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Adra C, Tran TD, Foster K, Tomlin R, Kurtböke Dİ. Untargeted MS-Based Metabolomic Analysis of Termite Gut-Associated Streptomycetes with Antifungal Activity against Pyrrhoderma noxium. Antibiotics (Basel) 2023; 12:1373. [PMID: 37760670 PMCID: PMC10525753 DOI: 10.3390/antibiotics12091373] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2023] [Revised: 08/21/2023] [Accepted: 08/22/2023] [Indexed: 09/29/2023] Open
Abstract
Pyrrhoderma noxium is a plant fungal pathogen that induces the disease of brown root rot in a large variety of tree species. It is currently infecting many of the amenity trees within Brisbane City of Queensland, Australia. Steering away from harmful chemical fungicides, biological control agents offer environmentally friendly alternatives. Streptomycetes are known for their production of novel bioactive secondary metabolites with biocontrol potential, particularly, streptomycete symbionts isolated from unique ecological niches. In this study, 37 termite gut-associated actinomycete isolates were identified using molecular methods and screened against P. noxium. A majority of the isolates belonged to the genus Streptomyces, and 15 isolates exhibited strong antifungal activity with up to 98.5% mycelial inhibition of the fungal pathogen. MS/MS molecular networking analysis of the isolates' fermentation extracts revealed several chemical classes with polyketides being among the most abundant. Most of the metabolites, however, did not have matches to the GNPS database, indicating potential novel antifungal compounds in the active extracts obtained from the isolates. Pathway enrichment and overrepresentation analyses revealed pathways relating to polyketide antibiotic production, among other antibiotic pathways, further confirming the biosynthetic potential of the termite gut-associated streptomycetes with biocontrol potential against P. noxium.
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Affiliation(s)
- Cherrihan Adra
- School of Science, Technology and Engineering, University of the Sunshine Coast, Maroochydore BC, QLD 4558, Australia; (C.A.); (T.D.T.)
| | - Trong D. Tran
- School of Science, Technology and Engineering, University of the Sunshine Coast, Maroochydore BC, QLD 4558, Australia; (C.A.); (T.D.T.)
- Centre for Bioinnovation, University of the Sunshine Coast, Maroochydore BC, QLD 4558, Australia
| | - Keith Foster
- Brisbane City Council, Program, Planning and Integration, Brisbane Square, Level 10, 266 George Street, Brisbane, QLD 4000, Australia; (K.F.); (R.T.)
| | - Russell Tomlin
- Brisbane City Council, Program, Planning and Integration, Brisbane Square, Level 10, 266 George Street, Brisbane, QLD 4000, Australia; (K.F.); (R.T.)
| | - D. İpek Kurtböke
- School of Science, Technology and Engineering, University of the Sunshine Coast, Maroochydore BC, QLD 4558, Australia; (C.A.); (T.D.T.)
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Verma J, Attri S, Arora S, Manhas RK. Antioxidant and chemoprotective potential of Streptomyces levis strain isolated from human gut. AMB Express 2023; 13:69. [PMID: 37418125 PMCID: PMC10328884 DOI: 10.1186/s13568-023-01570-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Accepted: 06/12/2023] [Indexed: 07/08/2023] Open
Abstract
In the current study, Streptomyces levis strain HFM-2 has been isolated from healthy human gut. Streptomyces sp. HFM-2 was identified based on the polyphasic approach that included cultural, morphological, chemotaxonomical, phylogenetic, physiological, and biochemical characteristics. 16S rRNA gene sequence of strain HFM-2 exhibited 100% similarity with Streptomyces levis strain 15423 (T). The EtOAc extract of Streptomyces levis strain HFM-2 showed potential antioxidant activity, along with 69.53 ± 0.19%, 64.76 ± 0.13%, and 84.82 ± 0.21% of scavenging activity for ABTS, DPPH, and superoxide radicals, respectively at 600 µg/mL. The IC50 values i.e. 50% scavenging activity for DPPH, ABTS, and superoxide radicals were achieved at 497.19, 388.13, and 268.79 (µg/mL), respectively. The extract's reducing power and total antioxidant capacity were determined to be 856.83 ± 0.76 and 860.06 ± 0.01 µg AAE/mg of dry extract, respectively. In addition, the EtOAc extract showed protection against DNA damage from oxidative stress caused by Fenton's reagent, and cytotoxic activity against HeLa cervical cancer, Skin (431) cancer, Ehrlich-Lettre Ascites-E (EAC) carcinoma, and L929 normal cell lines. The IC50 values against HeLa, 431 skin, and EAC carcinoma cell lines were found to be 50.69, 84.07, and 164.91 µg/mL, respectively. The EtOAc extract showed no toxicity towards L929 normal cells. In addition, flow cytometric analysis exhibited reduced mitochondrial membrane potential (MMP), and enhanced levels of reactive oxygen species (ROS). The EtOAc extract was chemically analyzed using GCMS to determine the components executing its bioactivities.
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Affiliation(s)
- Jaya Verma
- Department of Microbiology, Guru Nanak Dev University, Amritsar, Punjab, India
| | - Shivani Attri
- Department of Botanical and Environmental Sciences, Guru Nanak Dev University, Amritsar, Punjab, India
| | - Saroj Arora
- Department of Botanical and Environmental Sciences, Guru Nanak Dev University, Amritsar, Punjab, India
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Dow L, Gallart M, Ramarajan M, Law SR, Thatcher LF. Streptomyces and their specialised metabolites for phytopathogen control - comparative in vitro and in planta metabolic approaches. FRONTIERS IN PLANT SCIENCE 2023; 14:1151912. [PMID: 37389291 PMCID: PMC10301723 DOI: 10.3389/fpls.2023.1151912] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Accepted: 05/30/2023] [Indexed: 07/01/2023]
Abstract
In the search for new crop protection microbial biocontrol agents, isolates from the genus Streptomyces are commonly found with promising attributes. Streptomyces are natural soil dwellers and have evolved as plant symbionts producing specialised metabolites with antibiotic and antifungal activities. Streptomyces biocontrol strains can effectively suppress plant pathogens via direct antimicrobial activity, but also induce plant resistance through indirect biosynthetic pathways. The investigation of factors stimulating the production and release of Streptomyces bioactive compounds is commonly conducted in vitro, between Streptomyces sp. and a plant pathogen. However, recent research is starting to shed light on the behaviour of these biocontrol agents in planta, where the biotic and abiotic conditions share little similarity to those of controlled laboratory conditions. With a focus on specialised metabolites, this review details (i) the various methods by which Streptomyces biocontrol agents employ specialised metabolites as an additional line of defence against plant pathogens, (ii) the signals shared in the tripartite system of plant, pathogen and biocontrol agent, and (iii) an outlook on new approaches to expedite the identification and ecological understanding of these metabolites under a crop protection lens.
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Affiliation(s)
- Lachlan Dow
- Commonwealth Scientific and Industrial Research Organisation (CSIRO) Agriculture and Food, Acton, ACT, Australia
- Commonwealth Scientific and Industrial Research Organisation (CSIRO) Microbiomes for One Systems Health Future Science Platform, Acton, ACT, Australia
| | - Marta Gallart
- Commonwealth Scientific and Industrial Research Organisation (CSIRO) Agriculture and Food, Acton, ACT, Australia
- Commonwealth Scientific and Industrial Research Organisation (CSIRO) Advanced Engineering Biology Future Science Platform, Acton, ACT, Australia
| | - Margaret Ramarajan
- Commonwealth Scientific and Industrial Research Organisation (CSIRO) Agriculture and Food, Acton, ACT, Australia
| | - Simon R. Law
- Commonwealth Scientific and Industrial Research Organisation (CSIRO) Agriculture and Food, Acton, ACT, Australia
- Commonwealth Scientific and Industrial Research Organisation (CSIRO) Microbiomes for One Systems Health Future Science Platform, Acton, ACT, Australia
| | - Louise F. Thatcher
- Commonwealth Scientific and Industrial Research Organisation (CSIRO) Agriculture and Food, Acton, ACT, Australia
- Commonwealth Scientific and Industrial Research Organisation (CSIRO) Microbiomes for One Systems Health Future Science Platform, Acton, ACT, Australia
- Commonwealth Scientific and Industrial Research Organisation (CSIRO) Advanced Engineering Biology Future Science Platform, Acton, ACT, Australia
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Lu Z, Chen M, Long X, Yang H, Zhu D. Biological potential of Bacillus subtilis BS45 to inhibit the growth of Fusarium graminearum through oxidative damage and perturbing related protein synthesis. Front Microbiol 2023; 14:1064838. [PMID: 36891382 PMCID: PMC9987035 DOI: 10.3389/fmicb.2023.1064838] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2022] [Accepted: 01/31/2023] [Indexed: 02/22/2023] Open
Abstract
Fusarium root rot (FRR) caused by Fusarium graminearum poses a threat to global food security. Biological control is a promising control strategy for FRR. In this study, antagonistic bacteria were obtained using an in-vitro dual culture bioassay with F. graminearum. Molecular identification of the bacteria based on the 16S rDNA gene and whole genome revealed that the species belonged to the genus Bacillus. We evaluated the strain BS45 for its mechanism against phytopathogenic fungi and its biocontrol potential against FRR caused by F. graminearum. A methanol extract of BS45 caused swelling of the hyphal cells and the inhibition of conidial germination. The cell membrane was damaged and the macromolecular material leaked out of cells. In addition, the mycelial reactive oxygen species level increased, mitochondrial membrane potential decreased, oxidative stress-related gene expression level increased and oxygen-scavenging enzyme activity changed. In conclusion, the methanol extract of BS45 induced hyphal cell death through oxidative damage. A transcriptome analysis showed that differentially expressed genes were significantly enriched in ribosome function and various amino acid transport pathways, and the protein contents in cells were affected by the methanol extract of BS45, indicating that it interfered with mycelial protein synthesis. In terms of biocontrol capacity, the biomass of wheat seedlings treated with the bacteria increased, and the BS45 strain significantly inhibited the incidence of FRR disease in greenhouse tests. Therefore, strain BS45 and its metabolites are promising candidates for the biological control of F. graminearum and its related root rot diseases.
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Affiliation(s)
- Ziyun Lu
- Key Laboratory of Protection and Utilization of Subtropic Plant Resources of Jiangxi Province, Jiangxi Normal University, Nanchang, China
| | - Meiling Chen
- Key Laboratory of Protection and Utilization of Subtropic Plant Resources of Jiangxi Province, Jiangxi Normal University, Nanchang, China
| | - Xinyi Long
- Key Laboratory of Protection and Utilization of Subtropic Plant Resources of Jiangxi Province, Jiangxi Normal University, Nanchang, China
| | - Huilin Yang
- Key Laboratory of Protection and Utilization of Subtropic Plant Resources of Jiangxi Province, Jiangxi Normal University, Nanchang, China
| | - Du Zhu
- Key Laboratory of Protection and Utilization of Subtropic Plant Resources of Jiangxi Province, Jiangxi Normal University, Nanchang, China.,Key Laboratory of Bioprocess Engineering of Jiangxi Province, Jiangxi Science and Technology Normal University, Nanchang, China
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Devi S, Sharma M, Manhas RK. Investigating the plant growth promoting and biocontrol potentiality of endophytic Streptomyces SP. SP5 against early blight in Solanum lycopersicum seedlings. BMC Microbiol 2022; 22:285. [PMID: 36447141 PMCID: PMC9706909 DOI: 10.1186/s12866-022-02695-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Accepted: 11/08/2022] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND Early blight (EB), caused by Alternaria solani, is one of the alarming diseases that restrict tomato production globally. Existing cultural practices and fungicide applications are not enough to control early blight diseases. Therefore, the study aimed to isolate, identify, and characterize an endophytic Streptomyces exhibiting the potential to control early blight in tomato and also promote plant growth. RESULTS From a Citrus jambhiri leaf, an endophytic Streptomyces sp. with antagonistic activity against Alternaria solani, Colletotrichum acutatum, Cladosporium herbarum, Alternaria brassicicola, Alternaria sp., Fusarium oxysporum and Fusarium sp. was isolated. It was identified as a Streptomyces sp. through 16S ribosomal DNA sequence analysis and designated as SP5. It also produced indole acetic acid which was confirmed by Salkowski reagent assay, TLC and HPLC analysis. Treatment of pathogen infected plants with Streptomyces sp. SP5 antagonists (culture cells/culture supernatant/solvent extract/ acetone precipitates) decreased the early blight disease incidence and significantly increased the various agronomic traits. CONCLUSION The present study concluded that Streptomyces sp. SP5 possessed antifungal activity against different fungal phytopathogens and had significant potential to control early blight disease and promote plant growth.
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Affiliation(s)
- Sapna Devi
- grid.411894.10000 0001 0726 8286Department of Microbiology, Guru Nanak Dev University, Amritsar, Punjab India
| | - Manish Sharma
- grid.411894.10000 0001 0726 8286Department of Microbiology, Guru Nanak Dev University, Amritsar, Punjab India
| | - Rajesh Kumari Manhas
- grid.411894.10000 0001 0726 8286Department of Microbiology, Guru Nanak Dev University, Amritsar, Punjab India
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Torres-Rodriguez JA, Reyes-Pérez JJ, Quiñones-Aguilar EE, Hernandez-Montiel LG. Actinomycete Potential as Biocontrol Agent of Phytopathogenic Fungi: Mechanisms, Source, and Applications. PLANTS (BASEL, SWITZERLAND) 2022; 11:3201. [PMID: 36501241 PMCID: PMC9736024 DOI: 10.3390/plants11233201] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Revised: 11/09/2022] [Accepted: 11/17/2022] [Indexed: 06/17/2023]
Abstract
Synthetic fungicides have been the main control of phytopathogenic fungi. However, they cause harm to humans, animals, and the environment, as well as generating resistance in phytopathogenic fungi. In the last few decades, the use of microorganisms as biocontrol agents of phytopathogenic fungi has been an alternative to synthetic fungicide application. Actinomycetes isolated from terrestrial, marine, wetland, saline, and endophyte environments have been used for phytopathogenic fungus biocontrol. At present, there is a need for searching new secondary compounds and metabolites of different isolation sources of actinomycetes; however, little information is available on those isolated from other environments as biocontrol agents in agriculture. Therefore, the objective of this review is to compare the antifungal activity and the main mechanisms of action in actinomycetes isolated from different environments and to describe recent achievements of their application in agriculture. Although actinomycetes have potential as biocontrol agents of phytopathogenic fungi, few studies of actinomycetes are available of those from marine, saline, and wetland environments, which have equal or greater potential as biocontrol agents than isolates of actinomycetes from terrestrial environments.
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Affiliation(s)
- Juan A. Torres-Rodriguez
- Nanotechnology and Microbial Biocontrol Group, Centro de Investigaciones Biológicas del Noroeste, Av. Politécnico Nacional 195, Col. Playa Palo de Santa Rita Sur, La Paz 23090, Mexico
| | - Juan J. Reyes-Pérez
- Facultad de Ciencias Pecuarias, Universidad Técnica Estatal de Quevedo, Av. Quito km 1.5 vía a Santo Domingo, Quevedo 120501, Ecuador
| | - Evangelina E. Quiñones-Aguilar
- Centro de Investigaciones y Asistencia en Tecnología y Diseño del Estado de Jalisco, Camino Arenero, El Bajío del Arenal, Guadalajara 45019, Mexico
| | - Luis G. Hernandez-Montiel
- Nanotechnology and Microbial Biocontrol Group, Centro de Investigaciones Biológicas del Noroeste, Av. Politécnico Nacional 195, Col. Playa Palo de Santa Rita Sur, La Paz 23090, Mexico
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Yong D, Li Y, Gong K, Yu Y, Zhao S, Duan Q, Ren C, Li A, Fu J, Ni J, Zhang Y, Li R. Biocontrol of strawberry gray mold caused by Botrytis cinerea with the termite associated Streptomyces sp. sdu1201 and actinomycin D. Front Microbiol 2022; 13:1051730. [PMID: 36406410 PMCID: PMC9674021 DOI: 10.3389/fmicb.2022.1051730] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Accepted: 10/14/2022] [Indexed: 11/06/2022] Open
Abstract
Strawberry gray mold caused by Botrytis cinerea is one of the most severe diseases in pre- and post-harvest periods. Although fungicides have been an effective way to control this disease, they can cause serious “3R” problems (Resistance, Resurgence and Residue). In this study, Streptomyces sp. sdu1201 isolated from the hindgut of the fungus-growing termite Odontotermes formosanus revealed significant antifungal activity against B. cinerea. Four compounds (1–4) were isolated from Streptomyces sp. sdu1201 and further identified as actinomycins by the HRMS and 1D NMR data. Among them, actinomycin D had the strongest inhibitory activity against B. cinerea with the EC50 value of 7.65 μg mL−1. The control effect of actinomycin D on strawberry gray mold was also tested on fruits and leaves in vitro, and its control efficiency on leaves was 78.77% at 3 d. Moreover, actinomycin D can also inhibit the polarized growth of germ tubes of B. cinerea. Therefore, Streptomyces sp. sdu1201 and actinomycin D have great potential to gray mold as biocontrol agents.
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Affiliation(s)
- Daojing Yong
- Helmholtz International Lab for Anti-Infectives, Shandong University-Helmholtz Institute of Biotechnology, State Key Laboratory of Microbial Technology, Shandong University, Qingdao, China
- Qingdao Zhongda Agritech Co., Ltd., Qingdao, China
| | - Yue Li
- Helmholtz International Lab for Anti-Infectives, Shandong University-Helmholtz Institute of Biotechnology, State Key Laboratory of Microbial Technology, Shandong University, Qingdao, China
| | - Kai Gong
- Helmholtz International Lab for Anti-Infectives, Shandong University-Helmholtz Institute of Biotechnology, State Key Laboratory of Microbial Technology, Shandong University, Qingdao, China
| | - Yingying Yu
- Qingdao Zhongda Agritech Co., Ltd., Qingdao, China
| | - Shuai Zhao
- Qingdao Zhongda Agritech Co., Ltd., Qingdao, China
| | - Qiong Duan
- Helmholtz International Lab for Anti-Infectives, Shandong University-Helmholtz Institute of Biotechnology, State Key Laboratory of Microbial Technology, Shandong University, Qingdao, China
| | - Cailing Ren
- Helmholtz International Lab for Anti-Infectives, Shandong University-Helmholtz Institute of Biotechnology, State Key Laboratory of Microbial Technology, Shandong University, Qingdao, China
| | - Aiying Li
- Helmholtz International Lab for Anti-Infectives, Shandong University-Helmholtz Institute of Biotechnology, State Key Laboratory of Microbial Technology, Shandong University, Qingdao, China
| | - Jun Fu
- Helmholtz International Lab for Anti-Infectives, Shandong University-Helmholtz Institute of Biotechnology, State Key Laboratory of Microbial Technology, Shandong University, Qingdao, China
| | - Jinfeng Ni
- Helmholtz International Lab for Anti-Infectives, Shandong University-Helmholtz Institute of Biotechnology, State Key Laboratory of Microbial Technology, Shandong University, Qingdao, China
- *Correspondence: Jinfeng Ni,
| | - Youming Zhang
- Helmholtz International Lab for Anti-Infectives, Shandong University-Helmholtz Institute of Biotechnology, State Key Laboratory of Microbial Technology, Shandong University, Qingdao, China
- Chinese Academy of Sciences (CAS) Key Laboratory of Quantitative Engineering Biology, Shenzhen Institute of Synthetic Biology, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
- Youming Zhang,
| | - Ruijuan Li
- Helmholtz International Lab for Anti-Infectives, Shandong University-Helmholtz Institute of Biotechnology, State Key Laboratory of Microbial Technology, Shandong University, Qingdao, China
- Ruijuan Li,
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Sudha A, Durgadevi D, Archana S, Muthukumar A, Suthin Raj T, Nakkeeran S, Poczai P, Nasif O, Ansari MJ, Sayyed RZ. Unraveling the tripartite interaction of volatile compounds of Streptomyces rochei with grain mold pathogens infecting sorghum. Front Microbiol 2022; 13:923360. [PMID: 35966704 PMCID: PMC9366667 DOI: 10.3389/fmicb.2022.923360] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Accepted: 06/27/2022] [Indexed: 11/13/2022] Open
Abstract
Sorghum is a major grain crop used in traditional meals and health drinks, and as an efficient fuel. However, its productivity, value, germination, and usability are affected by grain mold, which is a severe problem in sorghum production systems, which reduces the yield of harvested grains for consumer use. The organic approach to the management of the disease is essential and will increase consumer demand. Bioactive molecules like mVOC (volatile organic compound) identification are used to unravel the molecules responsible for antifungal activity. The Streptomyces rochei strain (ASH) has been reported to be a potential antagonist to many pathogens, with high levels of VOCs. The present study aimed to study the inhibitory effect of S. rochei on sorghum grain mold pathogens using a dual culture technique and via the production of microbial volatile organic compounds (mVOCs). mVOCs inhibited the mycelial growth of Fusarium moniliforme by 63.75 and Curvularia lunata by 68.52%. mVOCs suppressed mycelial growth and inhibited the production of spores by altering the structure of mycelia in tripartite plate assay. About 45 mVOCs were profiled when Streptomyces rochei interacted with these two pathogens. In the present study, several compounds were upregulated or downregulated by S. rochei, including 2-methyl-1-butanol, methanoazulene, and cedrene. S. rochei emitted novel terpenoid compounds with peak areas, such as myrcene (1.14%), cymene (6.41%), and ç-terpinene (7.32%) upon interaction with F. moniliforme and C. lunata. The peak area of some of the compounds, including furan 2-methyl (0.70%), benzene (1.84%), 1-butanol, 2-methyl-(8.25%), and myrcene (1.12)%, was increased during tripartite interaction with F. moniliforme and C. lunata, which resulted in furan 2-methyl (6.60%), benzene (4.43%), butanol, 2-methyl (18.67%), and myrcene (1.14%). These metabolites were implicated in the sesquiterpenoid and alkane biosynthetic pathways and the oxalic acid degradation pathway. The present study shows how S. rochei exhibits hyperparasitism, competition, and antibiosis via mVOCs. In addition to their antimicrobial functions, these metabolites could also enhance plant growth.
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Affiliation(s)
- A. Sudha
- Department of Plant Pathology, Tamil Nadu Agricultural University, Coimbatore, India
| | - D. Durgadevi
- Department of Plant Pathology, Tamil Nadu Agricultural University, Coimbatore, India
| | - S. Archana
- Department of Plant Pathology, Tamil Nadu Agricultural University, Coimbatore, India
| | - A. Muthukumar
- Department of Plant Pathology, Faculty of Agriculture, Annamalai University, Chidambaram, India
| | - T. Suthin Raj
- Department of Plant Pathology, Faculty of Agriculture, Annamalai University, Chidambaram, India
| | - S. Nakkeeran
- Department of Biotechnology, Tamil Nadu Agricultural University, Coimbatore, India
| | - Peter Poczai
- Finnish Museum of Natural History, University of Helsinki, Helsinki, Finland
| | - Omaima Nasif
- Department of Physiology, College of Medicine, King Khalid University Hospital, King Saud University, Riyadh, Saudi Arabia
| | - Mohammad Javed Ansari
- Department of Botany, Hindu College, (Mahatma Jyotiba Phule Rohilkhand University, Bareilly), Moradabad, India
| | - R. Z. Sayyed
- Department of Microbiology, PSGVP Mandal’s S. I. Patil Arts, G. B. Patel Science, and STKV Sangh Commerce College, Shahada, India
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Paul SK, Chakraborty M, Rahman M, Gupta DR, Mahmud NU, Rahat AAM, Sarker A, Hannan MA, Rahman MM, Akanda AM, Ahmed JU, Islam T. Marine Natural Product Antimycin A Suppresses Wheat Blast Disease Caused by Magnaporthe oryzae Triticum. J Fungi (Basel) 2022; 8:jof8060618. [PMID: 35736101 PMCID: PMC9225063 DOI: 10.3390/jof8060618] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2022] [Revised: 05/31/2022] [Accepted: 06/06/2022] [Indexed: 02/05/2023] Open
Abstract
The application of chemical pesticides to protect agricultural crops from pests and diseases is discouraged due to their harmful effects on humans and the environment. Therefore, alternative approaches for crop protection through microbial or microbe-originated pesticides have been gaining momentum. Wheat blast is a destructive fungal disease caused by the Magnaporthe oryzae Triticum (MoT) pathotype, which poses a serious threat to global food security. Screening of secondary metabolites against MoT revealed that antimycin A isolated from a marine Streptomyces sp. had a significant inhibitory effect on mycelial growth in vitro. This study aimed to investigate the inhibitory effects of antimycin A on some critical life stages of MoT and evaluate the efficacy of wheat blast disease control using this natural product. A bioassay indicated that antimycin A suppressed mycelial growth (62.90%), conidiogenesis (100%), germination of conidia (42%), and the formation of appressoria in the germinated conidia (100%) of MoT at a 10 µg/mL concentration. Antimycin A suppressed MoT in a dose-dependent manner with a minimum inhibitory concentration of 0.005 μg/disk. If germinated, antimycin A induced abnormal germ tubes (4.8%) and suppressed the formation of appressoria. Interestingly, the application of antimycin A significantly suppressed wheat blast disease in both the seedling (100%) and heading stages (76.33%) of wheat at a 10 µg/mL concentration, supporting the results from in vitro study. This is the first report on the inhibition of mycelial growth, conidiogenesis, conidia germination, and detrimental morphological alterations in germinated conidia, and the suppression of wheat blast disease caused by a Triticum pathotype of M. Oryzae by antimycin A. Further study is required to unravel the precise mode of action of this promising natural compound for considering it as a biopesticide to combat wheat blast.
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Affiliation(s)
- Sanjoy Kumar Paul
- Institute of Biotechnology and Genetic Engineering (IBGE), Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh; (S.K.P.); (M.C.); (D.R.G.); (N.U.M.); (A.A.M.R.); (M.M.R.)
| | - Moutoshi Chakraborty
- Institute of Biotechnology and Genetic Engineering (IBGE), Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh; (S.K.P.); (M.C.); (D.R.G.); (N.U.M.); (A.A.M.R.); (M.M.R.)
| | - Mahfuzur Rahman
- Extension Service, Davis College of Agriculture, West Virginia University, Morgantown, WV 26506, USA;
| | - Dipali Rani Gupta
- Institute of Biotechnology and Genetic Engineering (IBGE), Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh; (S.K.P.); (M.C.); (D.R.G.); (N.U.M.); (A.A.M.R.); (M.M.R.)
| | - Nur Uddin Mahmud
- Institute of Biotechnology and Genetic Engineering (IBGE), Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh; (S.K.P.); (M.C.); (D.R.G.); (N.U.M.); (A.A.M.R.); (M.M.R.)
| | - Abdullah Al Mahbub Rahat
- Institute of Biotechnology and Genetic Engineering (IBGE), Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh; (S.K.P.); (M.C.); (D.R.G.); (N.U.M.); (A.A.M.R.); (M.M.R.)
| | - Aniruddha Sarker
- School of Applied Biosciences, College of Agriculture and Life Sciences, Kyungpook National University, Daegu 41566, Korea;
| | - Md. Abdul Hannan
- Department of Biochemistry and Molecular Biology, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh;
| | - Md. Mahbubur Rahman
- Institute of Biotechnology and Genetic Engineering (IBGE), Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh; (S.K.P.); (M.C.); (D.R.G.); (N.U.M.); (A.A.M.R.); (M.M.R.)
| | - Abdul Mannan Akanda
- Department of Plant Pathology, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh;
| | - Jalal Uddin Ahmed
- Department of Crop Botany, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh;
| | - Tofazzal Islam
- Institute of Biotechnology and Genetic Engineering (IBGE), Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh; (S.K.P.); (M.C.); (D.R.G.); (N.U.M.); (A.A.M.R.); (M.M.R.)
- Correspondence:
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11
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Boukaew S, Yossan S, Cheirsilp B, Prasertsan P. Impact of environmental factors on
Streptomyces
spp. metabolites against
Botrytis cinerea. J Basic Microbiol 2022; 62:611-622. [DOI: 10.1002/jobm.202100423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Revised: 11/27/2021] [Accepted: 12/31/2021] [Indexed: 11/05/2022]
Affiliation(s)
- Sawai Boukaew
- College of Innovation and Management Songkhla Rajabhat University Songkhla Thailand
| | - Siriporn Yossan
- Division of Environmental Science, Faculty of Liberal Arts and Science Sisaket Rajabhat University Sisaket Thailand
| | - Benjamas Cheirsilp
- International Program in Biotechnology, Center of Excellence in Innovative Biotechnology for Sustainable Utilization of Bioresources, Faculty of Agro‐Industry Prince of Songkla University Hatyai Thailand
| | - Poonsuk Prasertsan
- Research and Development Office Prince of Songkla University Hatyai Thailand
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12
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Efficient production of valinomycin by the soil bacterium, Streptomyces sp. ZJUT-IFE-354. 3 Biotech 2022; 12:2. [PMID: 34926115 PMCID: PMC8639877 DOI: 10.1007/s13205-021-03055-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Accepted: 11/03/2021] [Indexed: 01/03/2023] Open
Abstract
A novel strain with antifungal activity against Sclerotinia sclerotiorum was isolated from soil, and identified as Streptomyces sp. ZJUT-IFE-354 using morphological and 16S rDNA sequence analysis. The bioactive metabolite produced by strain ZJUT-IFE-354 was identified and characterized as valinomycin by spectroscopic and chemical methods. The yield of valinomycin was 191.26 mg/L from the culture of Streptomyces sp. ZJUT-IFE-354, which was the highest yield to our knowledge. The in vitro antifungal activity of valinomycin against S. sclerotiorum was investigated as 0.056 ± 0.012 (EC50) and 0.121 ± 0.023 μg/mL (EC95), respectively, which was approximately 10.696- and 30.960-fold more active than that of carbendazim. The results from scanning electron microscopy, cell membrane permeability, and D-sorbitol and ergosterol assay indicated that valinomycin exerted the antifungal activity probably by increasing permeability of fungal cell membrane, leading to mycelial electrolyte leakage, and eventually resulting in the death of S. sclerotiorum. Thus, valinomycin may be a promising antifungal agent to control S. sclerotiorum. SUPPLEMENTARY INFORMATION The online version contains supplementary material available at 10.1007/s13205-021-03055-5.
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Djebaili R, Pellegrini M, Ercole C, Farda B, Kitouni M, Del Gallo M. Biocontrol of Soil-Borne Pathogens of Solanum lycopersicum L. and Daucus carota L. by Plant Growth-Promoting Actinomycetes: In Vitro and In Planta Antagonistic Activity. Pathogens 2021; 10:pathogens10101305. [PMID: 34684253 PMCID: PMC8538725 DOI: 10.3390/pathogens10101305] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Revised: 10/07/2021] [Accepted: 10/08/2021] [Indexed: 01/12/2023] Open
Abstract
Biotic stress caused by pathogenic microorganisms leads to damage in crops. Tomato and carrot are among the most important vegetables cultivated worldwide. These plants are attacked by several pathogens, affecting their growth and productivity. Fourteen plant growth-promoting actinomycetes (PGPA) were screened for their in vitro biocontrol activity against Solanum lycopersicum and Daucus carota microbial phytopathogens. Their antifungal activity was evaluated against Fusarium oxysporum f. sp. radicis-lycopersici (FORL) and Rhizoctonia solani (RHS). Antibacterial activity was evaluated against Pseudomonas syringae, Pseudomonas corrugata, Pseudomonas syringae pv. actinidiae, and Pectobacterium carotovorum subsp. carotovorum. Strains that showed good in vitro results were further investigated in vitro (cell-free supernatants activity, scanning electron microscope observations of fungal inhibition). The consortium of the most active PGPA was then utilized as biocontrol agents in planta experiments on S. lycopersicum and D. carota. The Streptomyces albidoflavus H12 and Nocardiopsis aegyptica H14 strains showed the best in vitro biocontrol activities. The diffusible and volatile compounds and cell-free supernatants of these strains showed both antifungal (in vitro inhibition up to 85%, hyphal desegregation and fungicidal properties) and antibacterial activity (in vitro inhibition >25 mm and bactericidal properties). Their consortium was also able to counteract the infection symptoms of microbial phytopathogens during in planta experiments, improving plant status. The results obtained highlight the efficacy of the selected actinomycetes strains as biocontrol agents of S. lycopersicum and D. carota.
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Affiliation(s)
- Rihab Djebaili
- Department of Life, Health and Environmental Sciences, University of L’Aquila, Coppito, 67100 L’Aquila, Italy; (R.D.); (C.E.); (B.F.); (M.D.G.)
- Laboratory of Microbiological Engineering and Applications, University of Brothers Mentouri Constantine 1, Ain El Bey Road, Constantine 25000, Algeria;
| | - Marika Pellegrini
- Department of Life, Health and Environmental Sciences, University of L’Aquila, Coppito, 67100 L’Aquila, Italy; (R.D.); (C.E.); (B.F.); (M.D.G.)
- Correspondence: ; Tel.: +39-0862433246
| | - Claudia Ercole
- Department of Life, Health and Environmental Sciences, University of L’Aquila, Coppito, 67100 L’Aquila, Italy; (R.D.); (C.E.); (B.F.); (M.D.G.)
| | - Beatrice Farda
- Department of Life, Health and Environmental Sciences, University of L’Aquila, Coppito, 67100 L’Aquila, Italy; (R.D.); (C.E.); (B.F.); (M.D.G.)
| | - Mahmoud Kitouni
- Laboratory of Microbiological Engineering and Applications, University of Brothers Mentouri Constantine 1, Ain El Bey Road, Constantine 25000, Algeria;
| | - Maddalena Del Gallo
- Department of Life, Health and Environmental Sciences, University of L’Aquila, Coppito, 67100 L’Aquila, Italy; (R.D.); (C.E.); (B.F.); (M.D.G.)
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14
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Bioassay-Guided Isolation of Broad-Spectrum Fungicidal Active Compound from Artemisia ordosica. Metabolites 2021; 11:metabo11090629. [PMID: 34564445 PMCID: PMC8468595 DOI: 10.3390/metabo11090629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Revised: 09/14/2021] [Accepted: 09/14/2021] [Indexed: 12/04/2022] Open
Abstract
To avoid the widespread resistance of commercial fungicides, new broad-spectrum botanical fungicides need to be developed. In previous bioactive screening assays, extracts of Artemisia ordosica Krasch. (A. ordosica) had highly antifungal activities, but the responsible phytochemicals were unidentified. In this study, active compounds of A. ordosica extracts were identified using a bioassay-guided method, and antifungal assays were performed in vitro and in vivo. The bioactive compounds were dissolved in petroleum ether, and the best antifungal fraction contained four compounds: trans-dehydromatricaria ester (TDDE), 7, 4-demetylnringenin, capillarin, and stearic acid. Among them, TDDE exhibited the highest antifungal activity against six pathogenic fungi and five bacteria. It exhibited significant fungicidal activity against Thanatephorus cucumeris and Botrytis cinerea with EC50 values of 0.464 μg/mL and 1.4 μg/mL, respectively. The living tissue bioassay results showed that the relative protection effects (RPE) of TDDE on tomato leaves, tomato fruit, and strawberry leaves infected with B. cinerea reached 76.78%, 86.2%, and 80.89%, respectively. In pot experiments, the RPE on tomato and strawberry plants infected with B. cinerea reached 84.11% and 96.37%, respectively. Morphological and physiological examination showed that TDDE had significant inhibitory effects on mycelial growth, including increased top offshoot, contorted hyphal tips, and extravasated cytochylema. Meanwhile, bactericidal activities of TDDE were significantly higher than kanamycin and streptomycin in five bacteria, and the plant tissue experiments further demonstrated that it had an 88.31% RPE on walnut leaves infected with Xanthomonas campestris pv. jugiandis, 72.18% RPE on potato infected with Erwinia carotovora subsp. carotovora, and 82.50% RPE on kiwifruit branches infected with Pseudomonas syringae pv. actinidiae. The active compounds isolated from A. ordosica in this study show great potential value for developing broad-spectrum fungicides, and also provide an important way to identify and isolate new bioactive products from medicinal plants.
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15
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Jin L, Yang L, Li W, Xu D, Yang N, Li G, Wan P. Diversity and Biocontrol Potential of Culturable Endophytic Fungi in Cotton. Front Microbiol 2021; 12:698930. [PMID: 34484142 PMCID: PMC8415002 DOI: 10.3389/fmicb.2021.698930] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2021] [Accepted: 07/19/2021] [Indexed: 11/13/2022] Open
Abstract
Healthy cotton samples were collected and 93 endophytic fungal strains were isolated: 23 strains from the roots and 70 strains from the stems. Morphological characterization and ITS sequence analysis were used for the identification of these isolates. The results showed that the 93 strains including 20 species were highly diverse in terms of their taxonomy. Simpson's and Shannon's diversity indices were 0.915 and 3.848, respectively. Fusarium and Alternaria were the two dominant genera, constituting 19.4% of the total strains. Then, 72 spore-producing strains were tested for the suppression of cotton Verticillium wilt (CVW) caused by Verticillium dahliae in a greenhouse. Five strains exhibited effective suppression of CVW with average efficacy values higher than 50%. One of the effective strains, namely, Fusarium proliferatum 10R-7, was selected for the investigation of the role of fusaric acid, a secondary metabolite of strain 10R-7, in the suppression of V. dahliae and CVW. The results showed that F. proliferatum 10R-7 could produce fusaric acid, and this metabolite exhibited 100% inhibition of mycelial growth of V. dahliae at concentrations higher than 20 μg/ml. However, fusaric acid at 2.5 to 80 μg/ml was not effective in the suppression of CVW, compared with the control treatment with V. dahliae alone. F. proliferatum 10R-7 was labeled with green fluorescent protein (GFP), and the GFP-tagged strain was found to be able to colonize inside the taproots of cotton, suggesting that F. proliferatum 10R-7 is a true endophyte of cotton and endophytic colonization may play a role in the suppression of infection of cotton by V. dahliae.
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Affiliation(s)
- Lirong Jin
- State Key Laboratory of Agricultural Microbiology, Key Laboratory of Plant Pathology of Hubei Province, Huazhong Agricultural University, Wuhan, China.,Key Laboratory of Integrated Pest Management Crops in Central China, Ministry of Agriculture, Hubei Academy of Agricultural Sciences, Wuhan, China.,Hubei Key Laboratory of Crop Disease, Insect Pests and Weeds Control, Plant Protection, Soil and Fertilizer Research Institute, Hubei Academy of Agricultural Sciences, Wuhan, China
| | - Long Yang
- State Key Laboratory of Agricultural Microbiology, Key Laboratory of Plant Pathology of Hubei Province, Huazhong Agricultural University, Wuhan, China
| | - Wenjing Li
- Key Laboratory of Integrated Pest Management Crops in Central China, Ministry of Agriculture, Hubei Academy of Agricultural Sciences, Wuhan, China.,Hubei Key Laboratory of Crop Disease, Insect Pests and Weeds Control, Plant Protection, Soil and Fertilizer Research Institute, Hubei Academy of Agricultural Sciences, Wuhan, China
| | - Dong Xu
- Key Laboratory of Integrated Pest Management Crops in Central China, Ministry of Agriculture, Hubei Academy of Agricultural Sciences, Wuhan, China.,Hubei Key Laboratory of Crop Disease, Insect Pests and Weeds Control, Plant Protection, Soil and Fertilizer Research Institute, Hubei Academy of Agricultural Sciences, Wuhan, China
| | - Nina Yang
- Key Laboratory of Integrated Pest Management Crops in Central China, Ministry of Agriculture, Hubei Academy of Agricultural Sciences, Wuhan, China.,Hubei Key Laboratory of Crop Disease, Insect Pests and Weeds Control, Plant Protection, Soil and Fertilizer Research Institute, Hubei Academy of Agricultural Sciences, Wuhan, China
| | - Guoqing Li
- State Key Laboratory of Agricultural Microbiology, Key Laboratory of Plant Pathology of Hubei Province, Huazhong Agricultural University, Wuhan, China
| | - Peng Wan
- Key Laboratory of Integrated Pest Management Crops in Central China, Ministry of Agriculture, Hubei Academy of Agricultural Sciences, Wuhan, China.,Hubei Key Laboratory of Crop Disease, Insect Pests and Weeds Control, Plant Protection, Soil and Fertilizer Research Institute, Hubei Academy of Agricultural Sciences, Wuhan, China
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16
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Azish M, Shams-Ghahfarokhi M, Razzaghi-Abyaneh M. Antifungal activity and mechanism of action of dichloromethane extract fraction A from Streptomyces libani against Aspergillus fumigatus. J Appl Microbiol 2021; 131:1212-1225. [PMID: 33590651 DOI: 10.1111/jam.15040] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 02/01/2021] [Accepted: 02/13/2021] [Indexed: 12/21/2022]
Abstract
AIMS This study aimed to investigate the mechanism of antifungal action of Streptomyces libani dichloromethane extract fraction A (DCEFA) against Aspergillus fumigatus and the host cytotoxicity. METHODS AND RESULTS DCEFA was purified from S. libani by autobiography and showed strong antifungal activity against A. fumigatus. A combination of electron microscopy, cell permeability assays, total oxidant status (TOS) assay, cell cytotoxicity assay and haemolysis activity was carried out to determine the target site of DCEFA. Exposure of A. fumigatus to DCEFA caused the damage to membranous cellular structures and increased release of cellular materials, potassium ions and TOS production. DCEFA was bound to ergosterol but did not affect fungal cell wall and ergosterol content. DCEFA did not show any obvious haemolytic activity for RBCs and toxicity against HEK-293 cell line. CONCLUSIONS DCEFA may inhibit A. fumigatus growth by targeting fungal cell membrane which results in the leakage of potassium ions and other cellular components, TOS production and final cell death. SIGNIFICANCE AND IMPACT OF THE STUDY DCEFA of S. libani could be considered as a potential source of novel antifungals which may be useful for drug development against A. fumigatus as a life-threatening human pathogen.
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Affiliation(s)
- M Azish
- Department of Mycology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
| | - M Shams-Ghahfarokhi
- Department of Mycology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
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17
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Azish M, Shams Ghahfarokhi M, Razzaghi Abyaneh M. Optimization of the antifungal metabolite production in Streptomyces libani isolated from northern forests soils in Iran. Curr Med Mycol 2021; 6:20-26. [PMID: 34195456 PMCID: PMC8226041 DOI: 10.18502/cmm.6.4.5333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Background and Purpose: Soil bacteria have extreme population diversity among natural sources and are able to produce a wide array of antifungal metabolites.
This study aimed to isolate and identify the bioactive metabolite-producing bacteria from forest soils and evaluate their antimicrobial potent against some pathogenic organisms. Materials and Methods: In this study, soil samples were screened for antifungal activity against Aspergillus fumigatus on glucose-yeast extract (GY)
agar using a visual agar plate assay method. All growing bacteria were examined for antifungal activity, and antagonistic bacteria
were identified based on 16S ribosomal RNA sequence analysis. For optimization of the production of antifungal bioactive metabolites,
inhibitory bacteria were cultured on different culture conditions, including media, pH, temperature, and incubation time. Results: In total, 110 bacterial strains were isolated from the forest soils and four species with high antifungal activity were identified
as Streptomyces libani, Streptomyces angustmyceticus, Bacillus subtilis, and Sphingopyxis spp. on the basis of 16s ribosomal RNA sequencing.
Dichloromethane extract of the starch casein broth culture filtrate of the S. libani (incubated at 30° C for five days) showed strong
antifungal activity against A. fumigatus, Aspergillus niger, and Aspergillus flavus. Conclusion: Based on the results, forest soils contain organisms with antifungal activity and could be considered as a good source for novel
antifungal metabolites as effective and safe therapeutics.
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Affiliation(s)
- Maryam Azish
- Department of Mycology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
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18
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Cell-Free Supernatants of Plant Growth-Promoting Bacteria: A Review of Their Use as Biostimulant and Microbial Biocontrol Agents in Sustainable Agriculture. SUSTAINABILITY 2020. [DOI: 10.3390/su12239917] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Plant growth-promoting bacteria (PGPB) afford plants several advantages (i.e., improvement of nutrient acquisition, growth, and development; induction of abiotic and biotic stress tolerance). Numerous PGPB strains have been isolated and studied over the years. However, only a few of them are available on the market, mainly due to the failed bacterial survival within the formulations and after application inside agroecosystems. PGPB strains with these challenging limitations can be used for the formulation of cell-free supernatants (CFSs), broth cultures processed through several mechanical and physical processes for cell removal. In the scientific literature there are diverse reviews and updates on PGPB in agriculture. However, no review deals with CFSs and the CFS metabolites obtainable by PGPB. The main objective of this review is to provide useful information for future research on CFSs as biostimulant and biocontrol agents in sustainable agriculture. Studies on CFS agricultural applications, both for biostimulant and biocontrol applications, have been reviewed, presenting limitations and advantages. Among the 109 articles selected and examined, the Bacillus genus seems to be the most promising due to the numerous articles that support its biostimulant and biocontrol potentialities. The present review underlines that research about this topic needs to be encouraged; evidence so far obtained has demonstrated that PGPB could be a valid source of secondary metabolites useful in sustainable agriculture.
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19
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Sharma M, Manhas RK. Purification and characterization of salvianolic acid B from Streptomyces sp. M4 possessing antifungal activity against fungal phytopathogens. Microbiol Res 2020; 237:126478. [DOI: 10.1016/j.micres.2020.126478] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2019] [Revised: 02/21/2020] [Accepted: 03/28/2020] [Indexed: 01/23/2023]
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20
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Panthee S, Kito N, Hayashi T, Shimizu T, Ishikawa J, Hamamoto H, Osada H, Takahashi S. β-carboline chemical signals induce reveromycin production through a LuxR family regulator in Streptomyces sp. SN-593. Sci Rep 2020; 10:10230. [PMID: 32576869 PMCID: PMC7311520 DOI: 10.1038/s41598-020-66974-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Accepted: 05/27/2020] [Indexed: 12/21/2022] Open
Abstract
Actinomycetes bacteria produce diverse bioactive molecules that are useful as drug seeds. To improve their yield, researchers often optimize the fermentation medium. However, exactly how the extracellular chemicals present in the medium activate secondary metabolite gene clusters remains unresolved. BR-1, a β-carboline compound, was recently identified as a chemical signal that enhanced reveromycin A production in Streptomyces sp. SN-593. Here we show that BR-1 specifically bound to the transcriptional regulator protein RevU in the reveromycin A biosynthetic gene cluster, and enhanced RevU binding to its promoter. RevU belongs to the LuxR family regulator that is widely found in bacteria. Interestingly, BR-1 and its derivatives also enhanced the production of secondary metabolites in other Streptomyces species. Although LuxR-N-acyl homoserine lactone systems have been characterized in Gram-negative bacteria, we revealed LuxR-β-carboline system in Streptomyces sp. SN-593 for the production of secondary metabolites. This study might aid in understanding hidden chemical communication by β-carbolines.
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Affiliation(s)
- Suresh Panthee
- RIKEN Center for Sustainable Resource Science, Natural Product Biosynthesis Research Unit, Wako, Hirosawa 2-1, 351-0198, Saitama, Japan.,Teikyo University Institute of Medical Mycology, Otsuka 359, Hachioji, Tokyo, Japan
| | - Naoko Kito
- RIKEN Center for Sustainable Resource Science, Natural Product Biosynthesis Research Unit, Wako, Hirosawa 2-1, 351-0198, Saitama, Japan
| | - Teruo Hayashi
- RIKEN Center for Sustainable Resource Science, Chemical Biology Research Group, Wako, Hirosawa 2-1, 351-0198, Saitama, Japan
| | - Takeshi Shimizu
- RIKEN Center for Sustainable Resource Science, Chemical Biology Research Group, Wako, Hirosawa 2-1, 351-0198, Saitama, Japan
| | - Jun Ishikawa
- Department of Bioactive Molecules, National Institute of Infectious Diseases, Toyama 1-23-1, Shinjuku, Tokyo, 162-8640, Japan
| | - Hiroshi Hamamoto
- Teikyo University Institute of Medical Mycology, Otsuka 359, Hachioji, Tokyo, Japan
| | - Hiroyuki Osada
- RIKEN Center for Sustainable Resource Science, Chemical Biology Research Group, Wako, Hirosawa 2-1, 351-0198, Saitama, Japan.
| | - Shunji Takahashi
- RIKEN Center for Sustainable Resource Science, Natural Product Biosynthesis Research Unit, Wako, Hirosawa 2-1, 351-0198, Saitama, Japan.
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21
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Mehmood MA, Zhao H, Cheng J, Xie J, Jiang D, Fu Y. Sclerotia of a phytopathogenic fungus restrict microbial diversity and improve soil health by suppressing other pathogens and enriching beneficial microorganisms. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2020; 259:109857. [PMID: 32072956 DOI: 10.1016/j.jenvman.2019.109857] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2019] [Revised: 11/05/2019] [Accepted: 11/11/2019] [Indexed: 06/10/2023]
Abstract
Sclerotinia sclerotiorum, a notorious soil-borne pathogen of various important crops, produces numerous sclerotia to oversummer in the soil. Considering that sclerotia may also be attacked by other microbes in the soil, we hypothesized that sclerotia in soil may affect the community of soil microbes directly and/or indirectly. In this study, we inoculated sclerotia of S. sclerotiorum in soil collected from the field to observe changes in microbial diversity over three months using 16S rRNA and ITS2 sequencing techniques. Alpha diversity indices exhibited a decline in the diversity of microbial communities, while permanova results confirmed a significant difference in the microbial communities of sclerotia-amended and non-amended soil samples. In sclerotia-amended soil, fungal diversity showed enrichment of antagonists such as Clonostachys, Trichoderma, and Talaromyces and a drastic reduction in the plant pathogenic microbes compared to the non-amended soil. Sclerotia not only activated the antagonists but also enhanced the abundance of plant growth-promoting bacteria, such as Chitinophaga, Burkholderia, and Dyella. Moreover, the presence of sclerotia curtailed the growth of several notorious plant pathogenic fungi belonging to various genera such as Fusarium, Colletotrichum, Cladosporium, Athelia, Alternaria, and Macrophomina. Thus, we conclude that S. sclerotiorum when dormant in soil can reduce the diversity of soil microbes, including suppressing plant pathogens and enriching beneficial microbes. To the best of our knowledge, this is the first time a plant pathogen has been found in soil that can significantly suppress other pathogens. Our findings may provide novel cues to understand the ecology of crop pathogens in soil and maintaining soil conditions that could be beneficial for constructing a healthy soil microorganism community required for mitigating soil-borne diseases.
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Affiliation(s)
- Mirza Abid Mehmood
- State Key Laboratory of Agriculture Microbiology, Huazhong Agricultural University, Wuhan, 430070, Hubei Province, People's Republic of China; Provincial Key Laboratory of Plant Pathology of Hubei Province, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, 430070, Hubei Province, People's Republic of China; Department of Plant Pathology, Muhammad Nawaz Shareef University of Agriculture, Multan, Punjab, Pakistan
| | - Huizhang Zhao
- State Key Laboratory of Agriculture Microbiology, Huazhong Agricultural University, Wuhan, 430070, Hubei Province, People's Republic of China; Provincial Key Laboratory of Plant Pathology of Hubei Province, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, 430070, Hubei Province, People's Republic of China
| | - Jiasen Cheng
- State Key Laboratory of Agriculture Microbiology, Huazhong Agricultural University, Wuhan, 430070, Hubei Province, People's Republic of China; Provincial Key Laboratory of Plant Pathology of Hubei Province, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, 430070, Hubei Province, People's Republic of China
| | - Jiatao Xie
- State Key Laboratory of Agriculture Microbiology, Huazhong Agricultural University, Wuhan, 430070, Hubei Province, People's Republic of China; Provincial Key Laboratory of Plant Pathology of Hubei Province, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, 430070, Hubei Province, People's Republic of China
| | - Daohong Jiang
- State Key Laboratory of Agriculture Microbiology, Huazhong Agricultural University, Wuhan, 430070, Hubei Province, People's Republic of China; Provincial Key Laboratory of Plant Pathology of Hubei Province, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, 430070, Hubei Province, People's Republic of China
| | - Yanping Fu
- Provincial Key Laboratory of Plant Pathology of Hubei Province, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, 430070, Hubei Province, People's Republic of China.
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22
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El-Shatoury SA, Ameen F, Moussa H, Abdul Wahid O, Dewedar A, AlNadhari S. Biocontrol of chocolate spot disease ( Botrytis cinerea) in faba bean using endophytic actinomycetes Streptomyces: a field study to compare application techniques. PeerJ 2020; 8:e8582. [PMID: 32195043 PMCID: PMC7067178 DOI: 10.7717/peerj.8582] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Accepted: 01/16/2020] [Indexed: 12/14/2022] Open
Abstract
Sustainable agriculture is needing economic applications for disease control. One possibility is offered by local medical plants. Endophytes of medical plants, such as actinomycetes Streptomyces sp. have previously shown antagonistic activities against fungal phytopathogens. In the present field experiment, we aimed to verify the efficiency of endophytic Streptomyces against one of the common pathogens, Botrytis cinerea, causing chocolate spot disease for faba bean (Vicia fabae L.). We tested two strains of Streptomyces (MG788011, MG788012) and three techniques to apply the biocontrol agent: (1) coating the seeds with spores, (2) spraying mycelia and (3) spraying the crude metabolites over the plants. The technique using the crude metabolites was the most efficient to prevent the disease symptoms. Both of the endophytic strains diminished the disease symptoms and improved the plant growth. The study offers a potential biological control technique to prevent chocolate spot disease and, at the same time, increase the yields of faba bean in sustainable agriculture.
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Affiliation(s)
- Sahar A El-Shatoury
- Botany Department, Faculty of Sciences, Suez Canal University, Ismailia, Egypt
| | - Fuad Ameen
- Department of Botany & Microbiology, College of Science, King Saud University, Riyadh, Saudi Arabia.,Department of Marine Biology, Al-Hodeidah University, Al-Hodeidah, Yemen
| | - Heba Moussa
- Botany Department, Faculty of Sciences, Suez Canal University, Ismailia, Egypt
| | - Omar Abdul Wahid
- Botany Department, Faculty of Sciences, Suez Canal University, Ismailia, Egypt
| | - Ahmed Dewedar
- Botany Department, Faculty of Sciences, Suez Canal University, Ismailia, Egypt
| | - Saleh AlNadhari
- Department of Plant Protection, College of Agriculture, King Saud University, Riyadh, Saudi Arabia.,Department of Plant Protection, College of Agriculture & Veterinary Medicine Farms, Yemen, Ibb University, Ibb, Yemen
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23
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Lyu A, Yang L, Wu M, Zhang J, Li G. High Efficacy of the Volatile Organic Compounds of Streptomyces yanglinensis 3-10 in Suppression of Aspergillus Contamination on Peanut Kernels. Front Microbiol 2020; 11:142. [PMID: 32117161 PMCID: PMC7015977 DOI: 10.3389/fmicb.2020.00142] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Accepted: 01/21/2020] [Indexed: 11/13/2022] Open
Abstract
Aspergillus flavus and Aspergillus parasiticus are saprophytic fungi which can infect and contaminate preharvest and postharvest food/feed with production of aflatoxins (B1, B2, and G). They are also an opportunistic pathogen causing aspergillosis diseases of animals and humans. In this study, the volatile organic compounds (VOCs) from Streptomyces yanglinensis 3-10 were found to be able to inhibit mycelial growth, sporulation, conidial germination, and expression of aflatoxin biosynthesis genes in A. flavus and A. parasiticus in vitro. On peanut kernels, the VOCs can also reduce the disease severity and inhibit the aflatoxins production by A. flavus and A. parasiticus under the storage conditions. Scanning electron microscope (SEM) observation showed that high dosage of the VOCs can inhibit conidial germination and colonization by the two species of Aspergillus on peanut kernels. The VOCs also showed suppression of mycelial growth on 18 other plant pathogenic fungi and one Oomycetes organism. By using SPME-GC-MS, 19 major VOCs were detected, like in other Streptomyces, 2-MIB was found as the main volatile component among the detected VOCs. Three standard chemicals, including methyl 2-methylbutyrate (M2M), 2-phenylethanol (2-PE), and β-caryophyllene (β-CA), showed antifungal activity against A. flavus and A. parasiticus. Among them, M2M showed highest inhibitory effect than other two standard compounds against conidial germination of A. flavus and A. parasiticus. To date, this is the first record about the antifungal activity of M2M against A. flavus and A. parasiticus. The VOCs from S. yanglinensis 3-10 did not affect growth of peanut seedlings. In conclusion, our results indicate that S. yanglinensis 3-10 may has a potential to become a promising biofumigant in for control of A. flavus and A. parasiticus.
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Affiliation(s)
- Ang Lyu
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, China
- Key Laboratory of Plant Pathology of Hubei Province, Wuhan, China
- School of Life Sciences and Technology, Hubei Engineering University, Xiaogan, China
| | - Long Yang
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, China
- Key Laboratory of Plant Pathology of Hubei Province, Wuhan, China
| | - Mingde Wu
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, China
- Key Laboratory of Plant Pathology of Hubei Province, Wuhan, China
| | - Jing Zhang
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, China
- Key Laboratory of Plant Pathology of Hubei Province, Wuhan, China
| | - Guoqing Li
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, China
- Key Laboratory of Plant Pathology of Hubei Province, Wuhan, China
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24
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Qin J, Lyu A, Zhang QH, Yang L, Zhang J, Wu MD, Li GQ. Strain identification and metabolites isolation of Aspergillus capensis CanS-34A from Brassica napus. Mol Biol Rep 2019; 46:3451-3460. [PMID: 31012026 DOI: 10.1007/s11033-019-04808-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2018] [Accepted: 04/10/2019] [Indexed: 11/25/2022]
Abstract
An isolate (CanS-34A) of Aspergillus from a healthy plant of oilseed rape (Brassica napus) was identified based on morphological characterization and multi-locus phylogeny using the sequences of internal transcribed spacer (ITS)-5.8S rDNA region, BenA (for β-tubulin), CaM (for calmodulin) and RPB2 (for RNA polymerase II). The results showed that CanS-34A belongs to Aspergillus capensis Hirooka et al. The antifungal metabolites produced by CanS-34A in potato dextrose broth (PDB) were extracted with chloroform. Three antifungal metabolites were isolated and purified from the chloroform extract of the PDB cultural filtrates of CanS-34A, and chemically identified as methyl dichloroasterrate, penicillither and rosellichalasin. They all showed antifungal activity against the plant pathogenic fungi Botrytis cinerea, Monilinia fructicola, Sclerotinia sclerotiorum and Sclerotinia trifoliorum with the EC50 values ranging from 2.46 to 65.00 μg/mL. To our knowledge, this is the first report about production of penicillither by Aspergillus and about the antifungal activity of methyl dichloroasterrate, penicillither and rosellichalasin against the four plant pathogenic fungi.
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Affiliation(s)
- Jing Qin
- State Key Laboratory of Agricultural Microbiology and Key Laboratory of Plant Pathology of Hubei Province, Huazhong Agricultural University, Wuhan, 430070, China
- Shandong Analysis and Test Center, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250014, Shandong, China
| | - Ang Lyu
- State Key Laboratory of Agricultural Microbiology and Key Laboratory of Plant Pathology of Hubei Province, Huazhong Agricultural University, Wuhan, 430070, China
| | - Qing-Hua Zhang
- State Key Laboratory of Agricultural Microbiology and Key Laboratory of Plant Pathology of Hubei Province, Huazhong Agricultural University, Wuhan, 430070, China
- Forestry College, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
| | - Long Yang
- State Key Laboratory of Agricultural Microbiology and Key Laboratory of Plant Pathology of Hubei Province, Huazhong Agricultural University, Wuhan, 430070, China
| | - Jing Zhang
- State Key Laboratory of Agricultural Microbiology and Key Laboratory of Plant Pathology of Hubei Province, Huazhong Agricultural University, Wuhan, 430070, China
| | - Ming-de Wu
- State Key Laboratory of Agricultural Microbiology and Key Laboratory of Plant Pathology of Hubei Province, Huazhong Agricultural University, Wuhan, 430070, China
| | - Guo-Qing Li
- State Key Laboratory of Agricultural Microbiology and Key Laboratory of Plant Pathology of Hubei Province, Huazhong Agricultural University, Wuhan, 430070, China.
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25
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Shakeel Q, Lyu A, Zhang J, Wu M, Li G, Hsiang T, Yang L. Biocontrol of Aspergillus flavus on Peanut Kernels Using Streptomyces yanglinensis 3-10. Front Microbiol 2018; 9:1049. [PMID: 29875755 PMCID: PMC5974058 DOI: 10.3389/fmicb.2018.01049] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2017] [Accepted: 05/02/2018] [Indexed: 01/11/2023] Open
Abstract
The bacterium, Streptomyces yanglinensis 3-10, shows promise in the control of many phytopathogenic fungi. In this study, S. yanglinensis and its antifungal substances, culture filtrate (CF3-10) and crude extracts (CE3-10), were evaluated for their activity in reducing growth and aflatoxin AFB1 production by Aspergillus flavus, both in vitro and in vivo on peanut kernels. The results showed that in dual culture conditions, S. yanglinensis reduced the mycelial growth of A. flavus about 41% as compared to control. The mycelial growth of A. flavus was completely inhibited on potato dextrose agar amended with CF3-10 at 3% (v/v) or CE3-10 at 2.5 μg/ml. In liquid culture experiments, growth inhibition ranged from 32.3 to 91.9% with reduction in AFB1 production ranging from 46.4 to 93.4% using different concentrations of CF3-10 or CE3-10. For in vivo assays, CF3-10 at 0.133 ml/g (v/w) or CE3-10 at 13.3 μg/g (w/w) reduced the postharvest decay of peanut kernels by inhibiting visible growth of A. flavus leading to an 89.4 or 88.1% reduction in AFB1 detected, respectively. Compared with the controls, CF3-10 and CE3-10 in A. flavus shake culture significantly reduced expression levels of two AFB1 biosynthesis genes, aflR and aflS. Furthermore, electron microscopy observation showed that CF3-10 (2%, v/v) caused hyphae growth to be abnormal and shriveled, cell organelles to degenerate and collapse, large vacuoles to appear. These results suggest that S. yanglinensis 3-10 has potential as an alternative to chemical fungicides in protecting peanut kernels and other agricultural commodities against postharvest decay from A. flavus.
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Affiliation(s)
- Qaiser Shakeel
- State Key Laboratory of Agricultural Microbiology and Hubei Key Laboratory of Plant Pathology, Huazhong Agricultural University, Wuhan, China
| | - Ang Lyu
- State Key Laboratory of Agricultural Microbiology and Hubei Key Laboratory of Plant Pathology, Huazhong Agricultural University, Wuhan, China
| | - Jing Zhang
- State Key Laboratory of Agricultural Microbiology and Hubei Key Laboratory of Plant Pathology, Huazhong Agricultural University, Wuhan, China
| | - Mingde Wu
- State Key Laboratory of Agricultural Microbiology and Hubei Key Laboratory of Plant Pathology, Huazhong Agricultural University, Wuhan, China
| | - Guoqing Li
- State Key Laboratory of Agricultural Microbiology and Hubei Key Laboratory of Plant Pathology, Huazhong Agricultural University, Wuhan, China
| | - Tom Hsiang
- School of Environmental Sciences, University of Guelph, Guelph, ON, Canada
| | - Long Yang
- State Key Laboratory of Agricultural Microbiology and Hubei Key Laboratory of Plant Pathology, Huazhong Agricultural University, Wuhan, China
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26
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Chen Y, Zhou D, Qi D, Gao Z, Xie J, Luo Y. Growth Promotion and Disease Suppression Ability of a Streptomyces sp. CB-75 from Banana Rhizosphere Soil. Front Microbiol 2018; 8:2704. [PMID: 29387049 PMCID: PMC5776099 DOI: 10.3389/fmicb.2017.02704] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2017] [Accepted: 12/29/2017] [Indexed: 12/03/2022] Open
Abstract
An actinomycete strain, CB-75, was isolated from the soil of a diseased banana plantation in Hainan, China. Based on phenotypic and molecular characteristics, and 99.93% sequence similarity with Streptomyces spectabilis NBRC 13424 (AB184393), the strain was identified as Streptomyces sp. This strain exhibited broad-spectrum antifungal activity against 11 plant pathogenic fungi. Type I polyketide synthase (PKS-I) and non-ribosomal peptide synthetase (NRPS) were detected, which were indicative of the antifungal compounds that Streptomyces sp. CB-75 could produce. An ethyl acetate extract from the strain exhibited the lowest minimum inhibitory concentration (MIC) against Colletotrichum musae (ATCC 96167) (0.78 μg/ml) and yielded the highest antifungal activity against Colletotrichum gloeosporioides (ATCC 16330) (50.0 μg/ml). Also, spore germination was significantly inhibited by the crude extract. After treatment with the crude extract of Streptomyces sp. CB-75 at the concentration 2 × MIC, the pathogenic fungi showed deformation, shrinkage, collapse, and tortuosity when observed by scanning electron microscopy (SEM). By gas chromatography-mass spectrometry (GC-MS) of the crude extract, 18 chemical constituents were identified; (Z)-13-docosenamide was the major constituent. Pot experiments showed that the incidence of banana seedlings was reduced after using Streptomyces sp. CB-75 treatment. The disease index was 10.23, and the prevention and control effect was 83.12%. Furthermore, Streptomyces sp. CB-75 had a growth-promoting effect on banana plants. The chlorophyll content showed 88.24% improvement, the leaf area, root length, root diameter, plant height, and stem showed 88.24, 90.49, 136.17, 61.78, and 50.98% improvement, respectively, and the shoot fresh weight, root fresh weight, shoot dry weight, and root dry weight showed 82.38, 72.01, 195.33, and 113.33% improvement, respectively, compared with treatment of fermentation broth without Streptomyces sp. CB-75. Thus, Streptomyces sp. CB-75 is an important microbial resource as a biological control against plant pathogenic fungi and for promoting banana growth.
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Affiliation(s)
- Yufeng Chen
- Institute of Tropical Agriculture and Forestry, Hainan University, Haikou, China.,Institute of Tropical Bioscience and Biotechnology, China Academy of Tropical Agricultural Sciences, Haikou, China
| | - Dengbo Zhou
- Institute of Tropical Bioscience and Biotechnology, China Academy of Tropical Agricultural Sciences, Haikou, China
| | - Dengfeng Qi
- Institute of Tropical Bioscience and Biotechnology, China Academy of Tropical Agricultural Sciences, Haikou, China
| | - Zhufen Gao
- Institute of Tropical Bioscience and Biotechnology, China Academy of Tropical Agricultural Sciences, Haikou, China
| | - Jianghui Xie
- Institute of Tropical Bioscience and Biotechnology, China Academy of Tropical Agricultural Sciences, Haikou, China
| | - Yanping Luo
- Institute of Tropical Agriculture and Forestry, Hainan University, Haikou, China
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