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Sahgal M, Saini N, Jaggi V, Brindhaa NT, Kabdwal M, Singh RP, Prakash A. Antagonistic potential and biological control mechanisms of Pseudomonas strains against banded leaf and sheath blight disease of maize. Sci Rep 2024; 14:13580. [PMID: 38866928 PMCID: PMC11169287 DOI: 10.1038/s41598-024-64028-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Accepted: 06/04/2024] [Indexed: 06/14/2024] Open
Abstract
Rhizoctonia solani, the causal agent of banded leaf and sheath blight (BL&SB), poses a significant threat to maize and various crops globally. The increasing concerns surrounding the environmental and health impacts of chemical fungicides have encouraged intensified concern in the development of biological control agents (BCAs) as eco-friendly alternatives. In this study, we explored the potential of 22 rhizobacteria strains (AS1-AS22) isolates, recovered from the grasslands of the Pithoragarh region in the Central Himalayas, as effective BCAs against BL&SB disease. Among these strains, two Pseudomonas isolates, AS19 and AS21, exhibited pronounced inhibition of fungal mycelium growth in vitro, with respective inhibition rates of 57.04% and 54.15% in cell cultures and 66.56% and 65.60% in cell-free culture filtrates. Additionally, both strains demonstrated effective suppression of sclerotium growth. The strains AS19 and AS21 were identified as Pseudomonas sp. by 16S rDNA phylogeny and deposited under accession numbers NAIMCC-B-02303 and NAIMCC-B-02304, respectively. Further investigations revealed the mechanisms of action of AS19 and AS21, demonstrating their ability to induce systemic resistance (ISR) and exhibit broad-spectrum antifungal activity against Alternaria triticina, Bipolaris sorokiniana, Rhizoctonia maydis, and Fusarium oxysporum f. sp. lentis. Pot trials demonstrated significant reductions in BL&SB disease incidence (DI) following foliar applications of AS19 and AS21, with reductions ranging from 25 to 38.33% compared to control treatments. Scanning electron microscopy revealed substantial degradation of fungal mycelium by the strains, accompanied by the production of hydrolytic enzymes. These findings suggest the potential of Pseudomonas strains AS19 and AS21 as promising BCAs against BL&SB and other fungal pathogens. However, further field trials are warranted to validate their efficacy under natural conditions and elucidate the specific bacterial metabolites responsible for inducing systemic resistance. This study contributes to the advancement of sustainable disease management strategies and emphasizes the potential of Pseudomonas strains AS19 and AS21 in combating BL&SB and other fungal diseases affecting agricultural crops.
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Affiliation(s)
- Manvika Sahgal
- Department of Microbiology, G.B. Pant University of Agriculture and Technology, Pantnagar, Uttarakhand, 263145, India.
| | - Neha Saini
- Department of Microbiology, G.B. Pant University of Agriculture and Technology, Pantnagar, Uttarakhand, 263145, India
| | - Vandana Jaggi
- Department of Microbiology, G.B. Pant University of Agriculture and Technology, Pantnagar, Uttarakhand, 263145, India
| | - N T Brindhaa
- Department of Microbiology, G.B. Pant University of Agriculture and Technology, Pantnagar, Uttarakhand, 263145, India
| | - Manisha Kabdwal
- Department of Microbiology, G.B. Pant University of Agriculture and Technology, Pantnagar, Uttarakhand, 263145, India
| | - Rajesh Pratap Singh
- Department of Plant Pathology, College of Agriculture, Govind Ballabh Pant University of Agriculture and Technology, Udam Singh Nagar, Pantnagar, Uttarakhand, 263145, India
| | - Anil Prakash
- Department of Microbiology, Barkatullah University, Bhopal, 26, India
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2
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Testerman T, Varga J, Schiffer MM, Donohue H, Vieira Da Silva C, Graf J. Pseudomonas aphyarum sp. nov., Pseudomonas fontis sp. nov., Pseudomonas idahonensis sp. nov. and Pseudomonas rubra sp. nov., isolated from in, and around, a rainbow trout farm. Int J Syst Evol Microbiol 2023; 73. [PMID: 38108817 DOI: 10.1099/ijsem.0.006201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2023] Open
Abstract
During a large-scale bacterial culturing effort of biofilms in the vicinity of a rainbow trout aquaculture facility in Idaho, USA, 10 isolates were identified as having pathogen-inhibiting activity and were characterized further. These isolates were shown to be Gram-negative, rod-shaped bacteria belonging to the genus Pseudomonas. Whole-genome comparisons and multi-locus sequence analysis using four housekeeping genes (16S rRNA, gyrA, rpoB and rpoD) showed that these 10 isolates clustered into four distinct species groups. These comparisons also indicated that these isolates were below the established species cutoffs for the genus Pseudomonas. Further phenotypic characterization using API 20NE, API ZYM and Biolog GENIII assays and chemotaxonomic analysis of cellular fatty acids were carried out. Based on the genomic, physiological and chemotaxonomic properties of these isolates, we concluded that these strains composed four novel species of the genus Pseudomonas. The proposed names are as follows: Pseudomonas aphyarum sp. nov. consisting of strains ID233, ID386T and ID387 with ID386T (=DSM 114641T=ATCC TSD-305T) as the type strain; Pseudomonas rubra sp. nov. consisting of strains ID291T, ID609 and ID1025 with ID291T (=DSM 114640T=ATCC TSD-303T) as the type strain; Pseudomonas idahonensis sp. nov. consisting of strains ID357T and ID1048 with ID357T (=DSM 114609T=ATCC TSD-304T) as the type strain; and Pseudomonas fontis sp. nov. consisting of strains ID656T and ID681 with ID656T (=DSM 114610T=ATCC TSD-306T) as the type strain.
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Affiliation(s)
- Todd Testerman
- University of Connecticut, Department of Molecular and Cell Biology, Storrs, Connecticut, USA
| | - Jackie Varga
- University of Connecticut, Department of Molecular and Cell Biology, Storrs, Connecticut, USA
| | - Molly M Schiffer
- University of Hawaii at Manoa, Pacific Biosciences Research Center, Honolulu, HI, USA
| | - Hailey Donohue
- University of Connecticut, Department of Molecular and Cell Biology, Storrs, Connecticut, USA
| | | | - Joerg Graf
- University of Connecticut, Department of Molecular and Cell Biology, Storrs, Connecticut, USA
- University of Hawaii at Manoa, Pacific Biosciences Research Center, Honolulu, HI, USA
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3
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Vanama S, Gopalan NSR, Pesari M, Baskar M, Gali UD, Lakshmi DL, Koteshwar P, Jesudasu G, Rathod S, Prasad MS, Panuganti R, Sundaram RM, Mohapatra S, Kannan C. Native bio-control agents from the rice fields of Telangana, India: characterization and unveiling the potential against stem rot and false smut diseases of rice. World J Microbiol Biotechnol 2023; 40:2. [PMID: 37923802 DOI: 10.1007/s11274-023-03782-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2023] [Accepted: 09/28/2023] [Indexed: 11/06/2023]
Abstract
The stem rot caused by Sclerotium hydrophilum and false smut caused by Ustilaginoidea virens are two of the major production constraints in rice cultivation in India and other countries. Stem rot and false smut can be effectively controlled with synthetic fungicides. However, the indiscriminate use of chemical fungicides may cause development of resistance among the pathogens. In addition to this, synthetic fungicides also exhibit harmful impacts on the environment. Exploiting microbe-based alternatives for managing plant diseases diminishes public concerns about the ill effects of pesticide usage in crops. In this regard, the present study was designed to investigate the potential of native microbial biocontrol agents (BCAs) from rice rhizosphere for the sustainable management of stem rot and false smut diseases in rice. Potential BCAs and pathogens were identified and characterized through morphological, biochemical, and sanger sequencing techniques. Bio-efficacy tests of potential BCAs against stem rot and false smut diseases on rice under glasshouse conditions indicated higher seed vigour index of the treated seeds, significant improvement in the growth of the seedling, increased dry weight, reduction in percentage disease index viz., 70.03% (stem rot) and 69.24% (false smut) over the control plants. Phytohormones indole acetic acid (IAA), abscisic acid (ABA), gibberellic acid (GA), salicylic acid (SA), and zeatin (tZ) were detected and quantified in the four potential BCAs using liquid chromatography- tandem mass spectrometry (LC-MS/MS). Scanning electron microscopy (SEM) studies revealed the endophytic nature of the strains in rice. The study indicated a positive correlation between the diversity and concentration of phytohormones released by the bioagents and enhanced plant growth promotion and disease suppression in rice.
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Affiliation(s)
- Sowmya Vanama
- Professor Jayashankar, Telangana State Agricultural University, Rajendranagar, Hyderabad, Telangana, 500030, India
| | - N S Raja Gopalan
- Birla Institute of Technology and Science Pilani, Hyderabad Campus, Secunderabad, Telangana, 500078, India
| | - Maruthi Pesari
- ICAR-Indian Institute of Rice Research, Rajendranagar, Hyderabad, Telangana, 500030, India
| | - M Baskar
- ICAR-Indian Institute of Rice Research, Rajendranagar, Hyderabad, Telangana, 500030, India
| | - Uma Devi Gali
- Professor Jayashankar, Telangana State Agricultural University, Rajendranagar, Hyderabad, Telangana, 500030, India
| | - D Ladha Lakshmi
- ICAR-Indian Institute of Rice Research, Rajendranagar, Hyderabad, Telangana, 500030, India
| | - P Koteshwar
- ICAR-Indian Institute of Rice Research, Rajendranagar, Hyderabad, Telangana, 500030, India
| | - G Jesudasu
- ICAR-Indian Institute of Rice Research, Rajendranagar, Hyderabad, Telangana, 500030, India
| | - Santosha Rathod
- ICAR-Indian Institute of Rice Research, Rajendranagar, Hyderabad, Telangana, 500030, India
| | - M Srinivas Prasad
- ICAR-Indian Institute of Rice Research, Rajendranagar, Hyderabad, Telangana, 500030, India
| | - Rajanikanth Panuganti
- Professor Jayashankar, Telangana State Agricultural University, Rajendranagar, Hyderabad, Telangana, 500030, India
| | - R M Sundaram
- ICAR-Indian Institute of Rice Research, Rajendranagar, Hyderabad, Telangana, 500030, India
| | - Sridev Mohapatra
- Birla Institute of Technology and Science Pilani, Hyderabad Campus, Secunderabad, Telangana, 500078, India
| | - C Kannan
- ICAR-Indian Institute of Rice Research, Rajendranagar, Hyderabad, Telangana, 500030, India.
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4
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Shabana BM, Elkenany RM, Younis G. Sequencing and multiple antimicrobial resistance of Pseudomonas fluorescens isolated from Nile tilapia fish in Egypt. BRAZ J BIOL 2022; 84:e257144. [PMID: 35293547 DOI: 10.1590/1519-6984.257144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2021] [Accepted: 02/08/2022] [Indexed: 11/22/2022] Open
Abstract
Pseudomonas fluorescens is one of the main causes of septicemic diseases among freshwater fish, causing severe economic losses and decreasing farm efficiency. Thus, this research was aimed to investigate the occurrence of P. fluorescens in Nile Tilapia (O. niloticus) fish in Egypt, gene sequencing of 16SrDNA gene, and antimicrobial susceptibility. P. fluorescens strains were detected in 32% (128\400) of apparently healthy (9%; 36\400) and diseased (23%; 92\400) Nile tilapia fish. The highest prevalence was observed in gills of fish, 31.3% followed by intestine 26.9%, liver 24.2%, and kidneys 17.6%. The PCR results for the 16SrDNA gene of P. fluorescens showed 16SrDNA gene in 30% of examined isolates. Moreover, Homogeny and a strong relationship between strains of P. fluorescens was confirmed using 16SrDNA sequences. Beside the responsibility of 16SrDNA gene on the virulence of P. fluorescens. The results of antimicrobial susceptibility tests revealed that all strains were resistant to piperacillin (100%), followed by ceftazidime (29.7%), and cefepime (25.8%). The strains of P. fluorescence were highly sensitive to cefotaxime (74.2%), followed by ceftriaxone and levofloxacin (70.3% each). Interestingly, 29.7% of strains of P. fluorescens were multiple antimicrobial-resistant (MAR).
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Affiliation(s)
- B M Shabana
- Mansoura University, Faculty of Veterinary Medicine, Department of Bacteriology, Mycology and Immunology, Mansoura, Egypt
| | - R M Elkenany
- Mansoura University, Faculty of Veterinary Medicine, Department of Bacteriology, Mycology and Immunology, Mansoura, Egypt
| | - G Younis
- Mansoura University, Faculty of Veterinary Medicine, Department of Bacteriology, Mycology and Immunology, Mansoura, Egypt
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5
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Khan S, Shahid M, Khan MS, Syed A, Bahkali AH, Elgorban AM, Pichtel J. Fungicide-Tolerant Plant Growth-Promoting Rhizobacteria Mitigate Physiological Disruption of White Radish Caused by Fungicides Used in the Field Cultivation. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2020; 17:E7251. [PMID: 33020389 PMCID: PMC7579310 DOI: 10.3390/ijerph17197251] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Revised: 09/29/2020] [Accepted: 09/30/2020] [Indexed: 12/20/2022]
Abstract
Excessive use of fungicides in agriculture may result in substantial accumulation of active residues in soil, which affect crop health and yield. We investigated the response of Raphanus sativus (white radish) to fungicides in soil and potential beneficial interactions of radish plants with fungicide-tolerant plant growth-promoting rhizobacteria (PGPR). The PGPR were isolated from cabbage and mustard rhizospheres. Morphological and biochemical characteristics measured using standard methods, together with analysis of partial 16S rRNA gene sequences, revealed that fungicide-tolerant PGPR, isolates PS3 and AZ2, were closely related to Pseudomonas spp. These PGPR survived in the presence of high fungicide concentrations i.e., up to 2400 μg mL-1 carbendazim (CBZM) and 3200 μg mL-1 hexaconazole (HEXA). Bacterial isolates produced plant growth stimulants even under fungicide stress, though fungicides induced surface morphological distortion and alteration in membrane permeability of these bacteria, which was proved by a set of microscopic observations. Fungicides considerably affected the germination efficiency, growth, and physiological development of R. sativus, but these effects were relieved when inoculated with PGPR isolates. For instance, CBZM at 1500 mg kg-1 decreased whole dry biomass by 71%, whole plant length by 54%, total chlorophyll by 50%, protein content by 61%, and carotenoid production by 29%. After applying isolate AZ2 for white radish grown in CBZM (10 mg kg-1)-amended soil, it could improve plant growth and development with increased whole plant dry weight (10%), entire plant length (13%) and total chlorophyll content (18%). Similarly, isolate PS3 enhanced plant survival by relieving plant stress with declined biomarkers, i.e., proline (12%), malondialdehyde (3%), ascorbate peroxidase (6.5%), catalase (18%), and glutathione reductase (4%). Application of isolates AZ2 and PS3 could be effective for remediation of fungicide-contaminated soil and for improving the cultivation of radish plants while minimizing inputs of fungicides.
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Affiliation(s)
- Sadaf Khan
- Department of Agricultural Microbiology, Faculty of Agricultural Sciences, Aligarh Muslim University, Aligarh 202002, India; (S.K.); (M.S.K.)
| | - Mohammad Shahid
- Department of Agricultural Microbiology, Faculty of Agricultural Sciences, Aligarh Muslim University, Aligarh 202002, India; (S.K.); (M.S.K.)
| | - Mohammad Saghir Khan
- Department of Agricultural Microbiology, Faculty of Agricultural Sciences, Aligarh Muslim University, Aligarh 202002, India; (S.K.); (M.S.K.)
| | - Asad Syed
- Department of Botany and Microbiology, College of Science, King Saud University, P.O. 2455, Riyadh 11451, Saudi Arabia; (A.S.); (A.H.B.); (A.M.E.)
| | - Ali H. Bahkali
- Department of Botany and Microbiology, College of Science, King Saud University, P.O. 2455, Riyadh 11451, Saudi Arabia; (A.S.); (A.H.B.); (A.M.E.)
| | - Abdallah M. Elgorban
- Department of Botany and Microbiology, College of Science, King Saud University, P.O. 2455, Riyadh 11451, Saudi Arabia; (A.S.); (A.H.B.); (A.M.E.)
| | - John Pichtel
- Natural Resources and Environmental Management, Ball State University, Muncie, IN 47306, USA;
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6
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Meng L, Liu H, Lan T, Dong L, Hu H, Zhao S, Zhang Y, Zheng N, Wang J. Antibiotic Resistance Patterns of Pseudomonas spp. Isolated From Raw Milk Revealed by Whole Genome Sequencing. Front Microbiol 2020; 11:1005. [PMID: 32655503 PMCID: PMC7326020 DOI: 10.3389/fmicb.2020.01005] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Accepted: 04/24/2020] [Indexed: 12/11/2022] Open
Abstract
Psychrotrophic bacteria in raw milk are most well known for their spoilage potential and the economic losses they cause to the dairy industry. Food-related psychrotrophic bacteria are increasingly reported to have antibiotic resistance features. The aim of this study was to evaluate the resistance patterns of Pseudomonas spp. isolated from bulk-tank milk. In total, we investigated the antibiotic susceptibility profiles of 86 Pseudomonas spp. isolates from raw milk. All strains were tested against 15 antimicrobial agents. Pseudomonas isolates were most highly resistant to imipenem (95.3%), followed by trimethoprim-sulfamethoxazole (69.8%), aztreonam (60.5%), chloramphenicol (45.3%), and meropenem (27.9%). Their multiple antibiotic resistance (MAR) index values ranged from 0.0 to 0.8. Whole-genome sequencing revealed the presence of intrinsic resistance determinants, such as BcI, ampC-09, blaCTX-M, oprD, sul1, dfrE, catA1, catB3, catI, floR, and cmlV. Moreover, resistance-nodulation-cell division (RND) and ATP-binding cassette (ABC) antibiotic efflux pumps were also found. This study provides further knowledge of the antibiotic resistance patterns of Pseudomonas spp. in milk, which may advance our understanding of resistance in Pseudomonas and suggests that antibiotic resistance of Pseudomonas spp. in raw milk should be a concern.
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Affiliation(s)
- Lu Meng
- Laboratory of Quality and Safety Risk Assessment for Dairy Products of Ministry of Agriculture and Rural Affairs, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, China.,Key Laboratory of Quality & Safety Control for Milk and Dairy Products of Ministry of Agriculture and Rural Affairs, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Huimin Liu
- Laboratory of Quality and Safety Risk Assessment for Dairy Products of Ministry of Agriculture and Rural Affairs, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, China.,Key Laboratory of Quality & Safety Control for Milk and Dairy Products of Ministry of Agriculture and Rural Affairs, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Tu Lan
- Laboratory of Quality and Safety Risk Assessment for Dairy Products of Ministry of Agriculture and Rural Affairs, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, China.,Key Laboratory of Quality & Safety Control for Milk and Dairy Products of Ministry of Agriculture and Rural Affairs, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Lei Dong
- Laboratory of Quality and Safety Risk Assessment for Dairy Products of Ministry of Agriculture and Rural Affairs, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, China.,Key Laboratory of Quality & Safety Control for Milk and Dairy Products of Ministry of Agriculture and Rural Affairs, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Haiyan Hu
- Laboratory of Quality and Safety Risk Assessment for Dairy Products of Ministry of Agriculture and Rural Affairs, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, China.,Key Laboratory of Quality & Safety Control for Milk and Dairy Products of Ministry of Agriculture and Rural Affairs, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, China.,College of Animal Science and Technology, Anhui Agricultural University, Hefei, China
| | - Shengguo Zhao
- Laboratory of Quality and Safety Risk Assessment for Dairy Products of Ministry of Agriculture and Rural Affairs, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, China.,Key Laboratory of Quality & Safety Control for Milk and Dairy Products of Ministry of Agriculture and Rural Affairs, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Yangdong Zhang
- Laboratory of Quality and Safety Risk Assessment for Dairy Products of Ministry of Agriculture and Rural Affairs, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, China.,Key Laboratory of Quality & Safety Control for Milk and Dairy Products of Ministry of Agriculture and Rural Affairs, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Nan Zheng
- Laboratory of Quality and Safety Risk Assessment for Dairy Products of Ministry of Agriculture and Rural Affairs, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, China.,Key Laboratory of Quality & Safety Control for Milk and Dairy Products of Ministry of Agriculture and Rural Affairs, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Jiaqi Wang
- Laboratory of Quality and Safety Risk Assessment for Dairy Products of Ministry of Agriculture and Rural Affairs, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, China.,Key Laboratory of Quality & Safety Control for Milk and Dairy Products of Ministry of Agriculture and Rural Affairs, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
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7
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Skowronek M, Sajnaga E, Pleszczyńska M, Kazimierczak W, Lis M, Wiater A. Bacteria from the Midgut of Common Cockchafer ( Melolontha melolontha L.) Larvae Exhibiting Antagonistic Activity Against Bacterial Symbionts of Entomopathogenic Nematodes: Isolation and Molecular Identification. Int J Mol Sci 2020; 21:ijms21020580. [PMID: 31963214 PMCID: PMC7013910 DOI: 10.3390/ijms21020580] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Revised: 01/13/2020] [Accepted: 01/14/2020] [Indexed: 12/27/2022] Open
Abstract
The mechanisms of action of the complex including entomopathogenic nematodes of the genera Steinernema and Heterorhabditis and their mutualistic partners, i.e., bacteria Xenorhabdus and Photorhabdus, have been well explained, and the nematodes have been commercialized as biological control agents against many soil insect pests. However, little is known regarding the nature of the relationships between these bacteria and the gut microbiota of infected insects. In the present study, 900 bacterial isolates that were obtained from the midgut samples of Melolontha melolontha larvae were screened for their antagonistic activity against the selected species of the genera Xenorhabdus and Photorhabdus. Twelve strains exhibited significant antibacterial activity in the applied tests. They were identified based on 16S rRNA and rpoB, rpoD, or recA gene sequences as Pseudomonas chlororaphis, Citrobacter murliniae, Acinetobacter calcoaceticus, Chryseobacterium lathyri, Chryseobacterium sp., Serratia liquefaciens, and Serratia sp. The culture filtrate of the isolate P. chlororaphis MMC3 L3 04 exerted the strongest inhibitory effect on the tested bacteria. The results of the preliminary study that are presented here, which focused on interactions between the insect gut microbiota and mutualistic bacteria of entomopathogenic nematodes, show that bacteria inhabiting the gut of insects might play a key role in insect resistance to entomopathogenic nematode pressure.
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Affiliation(s)
- Marcin Skowronek
- Laboratory of Biocontrol, Application and Production of EPN, Centre for Interdisciplinary Research, Faculty of Biotechnology and Environmental Sciences, John Paul II Catholic University of Lublin, ul. Konstantynów 1J, 20-708 Lublin, Poland; (E.S.); (W.K.); (M.L.)
- Correspondence: (M.S.); (A.W.)
| | - Ewa Sajnaga
- Laboratory of Biocontrol, Application and Production of EPN, Centre for Interdisciplinary Research, Faculty of Biotechnology and Environmental Sciences, John Paul II Catholic University of Lublin, ul. Konstantynów 1J, 20-708 Lublin, Poland; (E.S.); (W.K.); (M.L.)
| | - Małgorzata Pleszczyńska
- Department of Industrial and Environmental Microbiology, Faculty of Biology and Biotechnology, Maria Curie-Skłodowska University, ul. Akademicka 19, 20-033 Lublin, Poland;
| | - Waldemar Kazimierczak
- Laboratory of Biocontrol, Application and Production of EPN, Centre for Interdisciplinary Research, Faculty of Biotechnology and Environmental Sciences, John Paul II Catholic University of Lublin, ul. Konstantynów 1J, 20-708 Lublin, Poland; (E.S.); (W.K.); (M.L.)
| | - Magdalena Lis
- Laboratory of Biocontrol, Application and Production of EPN, Centre for Interdisciplinary Research, Faculty of Biotechnology and Environmental Sciences, John Paul II Catholic University of Lublin, ul. Konstantynów 1J, 20-708 Lublin, Poland; (E.S.); (W.K.); (M.L.)
| | - Adrian Wiater
- Department of Industrial and Environmental Microbiology, Faculty of Biology and Biotechnology, Maria Curie-Skłodowska University, ul. Akademicka 19, 20-033 Lublin, Poland;
- Correspondence: (M.S.); (A.W.)
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8
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Biodiversity of epiphytic Pseudomonas strains isolated from leaves of pepper and lettuce. Biologia (Bratisl) 2019. [DOI: 10.2478/s11756-019-00392-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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9
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Qessaoui R, Bouharroud R, Furze JN, El Aalaoui M, Akroud H, Amarraque A, Vaerenbergh JV, Tahzima R, Mayad EH, Chebli B. Applications of New Rhizobacteria Pseudomonas Isolates in Agroecology via Fundamental Processes Complementing Plant Growth. Sci Rep 2019; 9:12832. [PMID: 31492898 PMCID: PMC6731270 DOI: 10.1038/s41598-019-49216-8] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Accepted: 08/08/2019] [Indexed: 01/17/2023] Open
Abstract
Pseudomonas isolates have frequently been isolated from the rhizosphere of plants, and several of them have been reported as plant growth-promoting rhizobacteria. In the present work, tomato (Solanum lycopersicum) seeds were germinated in greenhouse conditions, and the seedling height, length of plants, collar diameter and number of leaves were measured from plants grown in soil inoculated by bacterial isolates. Pseudomonas isolates were isolated from the rhizosphere. We used the Newman-Keuls test to ascertain pairwise differences. Isolates were identified as a new Pseudomonas species by rpoD gene sequencing. The results showed that isolates of Pseudomonas sp. (Q6B) increased seed germination (P = 0.01); Pseudomonas sp. (Q6B, Q14B, Q7B, Q1B and Q13B) also promoted seedling height (P = 0.01). All five isolates promoted plant length and enlarged the collar diameter (P = 0.01). Pseudomonas sp. (Q1B) also increased leaf number (P = 0.01). The investigation found that Pseudomonas isolates were able to solubilize phosphate, produce siderophores, ammonia, and indole-3-acetic acid and colonize the roots of tomato plants. This study shows that these five novel Pseudomonas sp. isolates can be effective new plant growth-promoting rhizobacteria.
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Affiliation(s)
- R Qessaoui
- Research Unit of Integrated Crop Production, Centre Regional de la Recherche Agronomique d'Agadir, Agadir, Morocco.,Biotechnology and Environmental Engineering Team, Laboratory of Mechanic Process Energy and Environment, National School of Applied Sciences, Ibn Zohr University, Agadir, Morocco
| | - R Bouharroud
- Research Unit of Integrated Crop Production, Centre Regional de la Recherche Agronomique d'Agadir, Agadir, Morocco.
| | - J N Furze
- Laboratory of Biotechnologies and Valorization of Natural Resources Faculty of Sciences - Agadir, Ibn Zohr University, Agadir, Morocco
| | - M El Aalaoui
- Research Unit of Integrated Crop Production, Centre Regional de la Recherche Agronomique d'Agadir, Agadir, Morocco
| | - H Akroud
- Research Unit of Integrated Crop Production, Centre Regional de la Recherche Agronomique d'Agadir, Agadir, Morocco
| | - A Amarraque
- Research Unit of Integrated Crop Production, Centre Regional de la Recherche Agronomique d'Agadir, Agadir, Morocco
| | - J Van Vaerenbergh
- Plant Science Unit - Flanders Research Institute for Agriculture, Fisheries and Food (ILVO), Merelbeke, Belgium
| | - R Tahzima
- Plant Science Unit - Flanders Research Institute for Agriculture, Fisheries and Food (ILVO), Merelbeke, Belgium
| | - E H Mayad
- Biotechnology and Environmental Engineering Team, Laboratory of Mechanic Process Energy and Environment, National School of Applied Sciences, Ibn Zohr University, Agadir, Morocco.,Laboratory of Biotechnologies and Valorization of Natural Resources Faculty of Sciences - Agadir, Ibn Zohr University, Agadir, Morocco
| | - B Chebli
- Biotechnology and Environmental Engineering Team, Laboratory of Mechanic Process Energy and Environment, National School of Applied Sciences, Ibn Zohr University, Agadir, Morocco
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Genomic and pathogenic properties of Pseudomonas syringae pv. syringae strains isolated from apricot in East Azerbaijan province, Iran. BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY 2019. [DOI: 10.1016/j.bcab.2019.101167] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Delivery of Inoculum of Rhizophagus irregularis via Seed Coating in Combination with Pseudomonas libanensis for Cowpea Production. AGRONOMY-BASEL 2019. [DOI: 10.3390/agronomy9010033] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Cowpea (Vigna unguiculata L. Walp) is an important legume grown primarily in semi-arid area. Its production is generally inhibited by various abiotic and biotic stresses. The use of beneficial microorganisms (e.g., plant growth promoting bacteria (PGPB) and arbuscular mycorrhizal fungi (AMF)) can enhance agricultural production, as these microorganisms can improve soil fertility and plant tolerance to environmental stresses, thus enhancing crop yield in an eco-friendly manner. Application of PGPB and AMF in large scale agriculture needs to be improved. Thus, the use of seed coating could be an efficient mechanism for placement of inocula into soils. The aim of this study was to evaluate the effects of the AMF Rhizophagus irregularis BEG140 and the PGPB Pseudomonas libanensis TR1 alone or in combination on the biomass and physiological traits of cowpea. Four treatments were set: (i) non-inoculated control; (ii) PGPB; (iii) AMF applied via seed coating; and (iv) PGPB + AMF applied via seed coating. Cowpea plants inoculated via seed coating with R. irregularis and those inoculated with R. irregularis + P. libanensis showed root mycorrhizal colonization of 21.7% and 24.2%, respectively. PGPB P. libanensis was efficient in enhancing plant biomass and seed yield. There was no benefit of single (AMF) or dual (PGPB + AMF) inoculation on plant growth or seed yield. The application of beneficial soil microorganisms can be a viable approach for sustainable cowpea production in precision agriculture scenarios.
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Chu TN, Tran BTH, Van Bui L, Hoang MTT. Plant growth-promoting rhizobacterium Pseudomonas PS01 induces salt tolerance in Arabidopsis thaliana. BMC Res Notes 2019; 12:11. [PMID: 30635071 PMCID: PMC6330407 DOI: 10.1186/s13104-019-4046-1] [Citation(s) in RCA: 57] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2018] [Accepted: 01/04/2019] [Indexed: 11/10/2022] Open
Abstract
OBJECTIVES Plant growth-promoting rhizobacteria (PGPR) may contribute to sustainable crop production by improving plant growth and/or plant tolerance to abiotic stresses. Soil salinity, which limits the productivity of crop plants, is one of the major concerns of modern agriculture, especially in countries heavily affected by climate change as Vietnam. Currently, only a few reports have studied local PGPR isolated in Vietnam, particular Pseudomonas. Therefore, our study aimed to isolate and identify a region-specific Pseudomonas strain and evaluate the effects of this strain on germination, growth promotion and gene expression of Arabidopsis thaliana under salt stress. RESULTS The Pseudomonas named PS01 was isolated from maize rhizosphere collected in Ben Tre province, Vietnam. This strain was identified as a member of the Pseudomonas putida subclade. Pseudomonas PS01 could improve the germination rate of Arabidopsis seeds in 150 mM NaCl. A. thaliana plants inoculated with Pseudomonas PS01 survived under salt stress conditions up to 225 mM NaCl, while all non-inoculated plants were dead above 200 mM NaCl. The transcriptional levels of genes related to stress tolerance showed that only LOX2 was up-regulated, while APX2 and GLYI7 were down-regulated in inoculated plants in comparison to the non-inoculated controls. In turn, RD29A and RD29B did not show any significant changes in their expression profiles.
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Affiliation(s)
- Thanh Nguyen Chu
- Department of Plant Biotechnology and Biotransformation, Faculty of Biology and Biotechnology, University of Science, Vietnam National University-Ho Chi Minh City, Ho Chi Minh City, Vietnam
| | - Bao Thi Hoai Tran
- Department of Plant Biotechnology and Biotransformation, Faculty of Biology and Biotechnology, University of Science, Vietnam National University-Ho Chi Minh City, Ho Chi Minh City, Vietnam
| | - Le Van Bui
- Department of Plant Biotechnology and Biotransformation, Faculty of Biology and Biotechnology, University of Science, Vietnam National University-Ho Chi Minh City, Ho Chi Minh City, Vietnam
| | - Minh Thi Thanh Hoang
- Department of Plant Biotechnology and Biotransformation, Faculty of Biology and Biotechnology, University of Science, Vietnam National University-Ho Chi Minh City, Ho Chi Minh City, Vietnam.
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Schlusselhuber M, Godard J, Sebban M, Bernay B, Garon D, Seguin V, Oulyadi H, Desmasures N. Characterization of Milkisin, a Novel Lipopeptide With Antimicrobial Properties Produced By Pseudomonas sp. UCMA 17988 Isolated From Bovine Raw Milk. Front Microbiol 2018; 9:1030. [PMID: 29892273 PMCID: PMC5985324 DOI: 10.3389/fmicb.2018.01030] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2018] [Accepted: 05/01/2018] [Indexed: 11/13/2022] Open
Abstract
Biosurfactants such as lipopeptides are amphiphilic compounds produced by microorganisms such as bacteria of the genera of Pseudomonas and Bacillus. Some of these molecules proved to have interesting antimicrobial, antiviral, insecticide, and/or tensioactive properties that are potentially useful for the agricultural, chemical, food, and pharmaceutical industries. Raw milk provides a physicochemical environment that is favorable to the multiplication of a broad spectrum of microorganisms. Among them, psychrotrophic bacterial species, especially members of the genus Pseudomonas, are predominant and colonize milk during cold storage and/or processing. We isolated the strain Pseudomonas sp. UCMA 17988 from raw cow milk, with antagonistic activity against Listeria monocytogenes, Staphylococcus aureus, and Salmonella enterica Newport. Antimicrobial molecules involved in the antagonistic activity of this strain were characterized. A mass spectrometry analysis highlighted the presence of four lipopeptides isoforms. The major isoform (1409 m/z), composed of 10 carbons in the lipidic chain, was named milkisin C. The three other isoforms detected at 1381, 1395, and 1423 m/z, that are concomitantly produced, were named milkisin A, B, and D, respectively. The structure of milkisin, as confirmed by nuclear magnetic resonance analyses, is closely related to amphisin family. Indeed, the peptidic chain was composed of 11 amino acids, 6 of which are conserved among the family. In conclusion, Pseudomonas sp. UCMA 17988 produces new members of the amphisin family which are responsible for the antagonistic activity of this strain.
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Affiliation(s)
| | - Justine Godard
- UNICAEN, UNIROUEN, ABTE, Normandie Université, Caen, France
| | - Muriel Sebban
- UNIROUEN, INSA Rouen, CNRS, COBRA, Normandie Université, Rouen, France
| | - Benoit Bernay
- UNICAEN, SF ICORE 4206, Normandie Université, Caen, France
| | - David Garon
- UNICAEN, UNIROUEN, ABTE, Normandie Université, Caen, France
| | | | - Hassan Oulyadi
- UNIROUEN, INSA Rouen, CNRS, COBRA, Normandie Université, Rouen, France
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Pinevich AV, Andronov EE, Pershina EV, Pinevich AA, Dmitrieva HY. Testing culture purity in prokaryotes: criteria and challenges. Antonie van Leeuwenhoek 2018; 111:1509-1521. [PMID: 29488181 DOI: 10.1007/s10482-018-1054-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2017] [Accepted: 02/21/2018] [Indexed: 01/05/2023]
Abstract
Reliance on pure cultures was introduced at the beginning of microbiology as a discipline and has remained significant although their adaptive properties are essentially dissimilar from those of mixed cultures and environmental populations. They are needed for (i) taxonomic identification; (ii) diagnostics of pathogens; (iii) virulence and pathogenicity studies; (iv) elucidation of metabolic properties; (v) testing sensitivity to antibiotics; (vi) full-length genome assembly; (vii) strain deposition in microbial collections; and (viii) description of new species with name validation. Depending on the specific task there are alternative claims for culture purity, i.e., when conventional criteria are satisfied or when looking deeper is necessary. Conventional proof (microscopic and plating controls) has a low resolution and depends on the observer's personal judgement. Phenotypic criteria alone cannot prove culture purity and should be complemented with genomic criteria. We consider the possible use of DNA high-throughput culture sequencing data to define criteria for only one genospecies, axenic state detection panel and only one genome. The second and third of these are preferable, although their resolving capacity (depth) is limited. Because minor contaminants may go undetected, even with deep sequencing, the reliably pure culture would be a clonal culture launched from a single cell or trichome (multicellular bacterium). Although this type of culture is associated with technical difficulties and cannot be employed on a large scale (the corresponding inoculums may have low chances of growth when transferred to solid media), it is hoped that the high-throughput culturing methods introduced by 'culturomics' will overcome this obstacle.
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Affiliation(s)
- Alexander V Pinevich
- Saint Petersburg State University, Universitetskaya Quay, 7/9, P.O. Box 199034, St. Petersburg, Russia.
| | - Eugeny E Andronov
- All-Russia Research Institute for Agricultural Microbiology (ARRIAM), Russian Academy of Sciences, Podbelskogo Highway, 3, P.O. Box 196608, St. Petersburg-Pushkin, Russia
| | - Elizaveta V Pershina
- All-Russia Research Institute for Agricultural Microbiology (ARRIAM), Russian Academy of Sciences, Podbelskogo Highway, 3, P.O. Box 196608, St. Petersburg-Pushkin, Russia
| | - Agnia A Pinevich
- Saint Petersburg State University, Universitetskaya Quay, 7/9, P.O. Box 199034, St. Petersburg, Russia
| | - Helena Y Dmitrieva
- Saint Petersburg State University, Universitetskaya Quay, 7/9, P.O. Box 199034, St. Petersburg, Russia
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Srivastava M, Kaushik MS, Srivastava A, Singh A, Verma E, Mishra AK. Deciphering the evolutionary affiliations among bacterial strains (Pseudomonas and Frankia sp.) inhabiting same ecological niche using virtual RFLP and simulation-based approaches. 3 Biotech 2016; 6:178. [PMID: 28330250 PMCID: PMC4993716 DOI: 10.1007/s13205-016-0488-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2016] [Accepted: 08/02/2016] [Indexed: 01/26/2023] Open
Abstract
To decipher an evolutionary lineage between two different but important bacterial groups, i.e., Pseudomonas strain (γ-Proteobacteria) and Frankia strain (actinobacteria) growing in the same ecological niche in and around of an actinorhizal plant Hippophae salicifolia D. Don, genetic diversity and comparative molecular phylogeny have been investigated using 16S rRNA gene sequences and computer-simulated and virtually directed restriction fragment length polymorphism (RFLP) through 10 restriction enzymes. Bayesian and coalescent analyses on the basis of 16S rRNA gene sequences suggested three major groups with close proximity between Pseudomonas and Frankia isolates. This result has been further validated based on the data observed through similarity coefficient value and computational RFLP. Principal component analysis and Mandel h and k statistical analysis also confirmed and strengthen the findings. Approximately 458 aligned sequence of all the taxa were used to decipher nucleotide diversity, polymorphism and gene flow between these taxa. Thus, our results suggest for a possible co-evolution or a heterologous gene transfer of distantly related microbial forms. Further, our study also advocate for the use of computer aided, virtual RFLP analysis as a cost effective and rapid identification tool.
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Affiliation(s)
- Meenakshi Srivastava
- Laboratory of Microbial Genetics, Department of Botany, Banaras Hindu University, Varanasi, 221005, India
| | - Manish Singh Kaushik
- Laboratory of Microbial Genetics, Department of Botany, Banaras Hindu University, Varanasi, 221005, India
| | - Amrita Srivastava
- Laboratory of Microbial Genetics, Department of Botany, Banaras Hindu University, Varanasi, 221005, India
| | - Anumeha Singh
- Laboratory of Microbial Genetics, Department of Botany, Banaras Hindu University, Varanasi, 221005, India
| | - Ekta Verma
- Laboratory of Microbial Genetics, Department of Botany, Banaras Hindu University, Varanasi, 221005, India
| | - Arun Kumar Mishra
- Laboratory of Microbial Genetics, Department of Botany, Banaras Hindu University, Varanasi, 221005, India.
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