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Magome TG, Ochai SO, Hassim A, Bezuidenhout CC, van Heerden H, Lekota KE. A genome-based investigation of the Priestia species isolated from anthrax endemic regions in Kruger National Park. INFECTION, GENETICS AND EVOLUTION : JOURNAL OF MOLECULAR EPIDEMIOLOGY AND EVOLUTIONARY GENETICS IN INFECTIOUS DISEASES 2024; 123:105649. [PMID: 39059732 DOI: 10.1016/j.meegid.2024.105649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2024] [Revised: 07/21/2024] [Accepted: 07/23/2024] [Indexed: 07/28/2024]
Abstract
Priestia is a genus that was renamed from the genus Bacillus based on the conserved signature indels (CSIs) in protein sequences that separate Priestia species from Bacillus, with the latter only including species closely related to B. subtilis and B. cereus. Diagnosis of anthrax, a zoonotic disease, is implicated by tripartite anthrax virulence genes (lef, pagA, and cya) and poly-γ-D-glutamic acid capsular genes cap-ABCDE of Bacillus anthracis. Due to the amplification of anthrax virulence genes in Priestia isolates, the search for homologous anthrax virulence genes within the Priestia genomes (n = 9) isolated from animal blood smears was embarked upon through whole genome sequencing. In silico taxonomic identification of the isolates was conducted using genome taxonomy database (GTDB), average nucleotide identity (ANI), and multi-locus sequence typing (MLST), which identified the genomes as P. aryabhattai (n = 5), P. endophytica (n = 2) and P. megaterium (n = 2). A pan-genome analysis was further conducted on the Priestia genomes, including the screening of virulence, antibiotic resistance genes and mobile genetic elements on the sequenced genomes. The oligoribonuclease NrnB protein sequences showed that Priestia spp. possess a unique CSI that is absent in other Bacillus species. Furthermore, the CSI in P. endophytica is unique from other Priestia spp. Pan-genomic analysis indicates that P. endophytica clusters separately from P. aryabhattai and P. megaterium. In silico BLASTn genome analysis using the SYBR primers, Taqman probes and primers that target the chromosomal marker (Ba-1), protective antigen (pagA), and lethal factor (lef) on B. anthracis, showed partial binding to Priestia regions encoding for hypothetical proteins, pyridoxine biosynthesis, hydrolase, and inhibitory proteins. The antibiotic resistance genes (ARG) profile of Priestia spp. showed that the genomes contained no more than two ARGs. This included genes conferring resistance to rifamycin and fosfomycin on P. endophytica, as well as clindamycin on P. aryabhattai and P. megaterium. Priestia genomes lacked B. anthracis plasmids and consisted of plasmid replicon types with unknown functions. Furthermore, the amplification of Priestia strains may result in false positives when qPCR is used to detect the virulence genes of B. anthracis in soil, blood smears, and/or environmental samples.
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Affiliation(s)
- Thuto Gomolemo Magome
- Unit for Environmental Sciences and Management, Microbiology, North-West University, Potchefstroom, South Africa.
| | - Sunday Ochonu Ochai
- Department of Veterinary Tropical Diseases, Faculty of Veterinary Science, University of Pretoria, Onderstepoort, South Africa; International Centre for Antimicrobial Resistance Solutions, Copenhagen S, 2300, Denmark; Antimicrobial Research Unit, College of Health Sciences, University of KwaZulu-Natal, Durban, South Africa
| | - Ayesha Hassim
- Department of Veterinary Tropical Diseases, Faculty of Veterinary Science, University of Pretoria, Onderstepoort, South Africa
| | | | - Henriette van Heerden
- Department of Veterinary Tropical Diseases, Faculty of Veterinary Science, University of Pretoria, Onderstepoort, South Africa
| | - Kgaugelo Edward Lekota
- Unit for Environmental Sciences and Management, Microbiology, North-West University, Potchefstroom, South Africa
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Tian X, Hu L, Jia R, Cao S, Sun Y, Dong X, Wang Y. Streptomyces pratensis S10 Promotes Wheat Plant Growth and Induces Resistance in Wheat Seedlings against Fusarium graminearum. J Fungi (Basel) 2024; 10:578. [PMID: 39194904 DOI: 10.3390/jof10080578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2024] [Revised: 08/04/2024] [Accepted: 08/12/2024] [Indexed: 08/29/2024] Open
Abstract
Fusarium graminearum, a devastating fungal pathogen, causes great economic losses to crop yields worldwide. The present study investigated the potential of Streptomyces pratensis S10 to alleviate F. graminearum stress in wheat seedlings based on plant growth-promoting and resistance-inducing assays. The bioassays revealed that S10 exhibited multiple plant growth-promoting properties, including the production of siderophores, 1-aminocyclopropane-1-carboxylic acid deaminase (ACC), and indole-3-acetic acid (IAA), phosphate solubilization, and nitrogen fixation. Meanwhile, the pot experiment demonstrated that S10 improved wheat plant development, substantially enhancing wheat height, weight, root activity, and chlorophyll content. Consistently, genome mining identified abundant genes associated with plant growth promotion. S10 induced resistance against F. graminearum in wheat seedlings. The disease incidence and disease index reduced by nearly 52% and 65% in S10 pretreated wheat seedlings, respectively, compared with those infected with F. graminearum only in the non-contact inoculation assay. Moreover, S10 enhanced callose deposition and reactive oxygen species (ROS) accumulation and induced the activities of CAT, SOD, POD, PAL, and PPO. Furthermore, the quantitative real-time PCR (qRT-PCR) results indicated that S10 pretreatment increased the expression of SA- (PR1.1, PR2, PR5, and PAL1) and JA/ET-related genes (PR3, PR4a, PR9, and PDF1.2) in wheat seedlings upon F. graminearum infection. In summary, S. pratensis S10 could be an integrated biological agent and biofertilizer in wheat seedling blight management and plant productivity enhancement.
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Affiliation(s)
- Xiaoman Tian
- College of Bioengineering, Yangling Vocation & Technical College, Yangling, Xianyang 712100, China
| | - Lifang Hu
- College of Plant Protection, Northwest A&F University, Yangling, Xianyang 712100, China
| | - Ruimin Jia
- College of Plant Protection, Northwest A&F University, Yangling, Xianyang 712100, China
| | - Shang Cao
- College of Plant Protection, Northwest A&F University, Yangling, Xianyang 712100, China
| | - Yan Sun
- College of Plant Protection, Northwest A&F University, Yangling, Xianyang 712100, China
| | - Xiaomin Dong
- College of Plant Protection, Northwest A&F University, Yangling, Xianyang 712100, China
| | - Yang Wang
- College of Plant Protection, Northwest A&F University, Yangling, Xianyang 712100, China
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Dhar SK, Kaur J, Singh GB, Chauhan A, Tamang J, Lakhara N, Asyakina L, Atuchin V, Mudgal G, Abdi G. Novel Bacillus and Prestia isolates from Dwarf century plant enhance crop yield and salinity tolerance. Sci Rep 2024; 14:14645. [PMID: 38918548 PMCID: PMC11199671 DOI: 10.1038/s41598-024-65632-x] [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: 03/26/2024] [Accepted: 06/21/2024] [Indexed: 06/27/2024] Open
Abstract
Soil salinity is a major environmental stressor impacting global food production. Staple crops like wheat experience significant yield losses in saline environments. Bioprospecting for beneficial microbes associated with stress-resistant plants offers a promising strategy for sustainable agriculture. We isolated two novel endophytic bacteria, Bacillus cereus (ADJ1) and Priestia aryabhattai (ADJ6), from Agave desmettiana Jacobi. Both strains displayed potent plant growth-promoting (PGP) traits, such as producing high amounts of indole-3-acetic acid (9.46, 10.00 µgml-1), ammonia (64.67, 108.97 µmol ml-1), zinc solubilization (Index of 3.33, 4.22, respectively), ACC deaminase production and biofilm formation. ADJ6 additionally showed inorganic phosphate solubilization (PSI of 2.77), atmospheric nitrogen fixation, and hydrogen cyanide production. Wheat seeds primed with these endophytes exhibited enhanced germination, improved growth profiles, and significantly increased yields in field trials. Notably, both ADJ1 and ADJ6 tolerated high salinity (up to 1.03 M) and significantly improved wheat germination and seedling growth under saline stress, acting both independently and synergistically. This study reveals promising stress-tolerance traits within endophytic bacteria from A. desmettiana. Exploiting such under-explored plant microbiomes offers a sustainable approach to developing salt-tolerant crops, mitigating the impact of climate change-induced salinization on global food security.
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Affiliation(s)
- Sanjoy Kumar Dhar
- University Institute of Biotechnology, Chandigarh University, Mohali, Punjab, 140413, India
| | - Jaspreet Kaur
- University Institute of Biotechnology, Chandigarh University, Mohali, Punjab, 140413, India
| | - Gajendra Bahadur Singh
- University Institute of Biotechnology, Chandigarh University, Mohali, Punjab, 140413, India
| | - Arjun Chauhan
- Department of Biotechnology, Institute of Applied Sciences & Humanities, GLA University, Mathura, Uttar Pradesh, 281406, India
| | - Jeewan Tamang
- University Institute of Agricultural Sciences, Chandigarh University, Mohali, Punjab, 140413, India
- Khaniyabas Rural Municipality, Province 3, Dhading, Bagmati Zone, 45100, Nepal
| | - Nikita Lakhara
- University Institute of Biotechnology, Chandigarh University, Mohali, Punjab, 140413, India
| | - Lyudmila Asyakina
- Laboratory for Phytoremediation of Technogenically Disturbed Ecosystems, Kemerovo State University, Krasnaya Street, 6, Kemerovo, Russia, 650000
| | - Victor Atuchin
- Laboratory of Optical Materials and Structures, Institute of Semiconductor Physics, SB RAS, Novosibirsk, Russia, 630090
- Research and Development Department, Kemerovo State University, Kemerovo, Russia, 650000
- Department of Industrial Machinery Design, Novosibirsk State Technical University, Novosibirsk, Russia, 630073
- R&D Center "Advanced Electronic Technologies", Tomsk State University, Tomsk, Russia, 634034
| | - Gaurav Mudgal
- University Institute of Biotechnology, Chandigarh University, Mohali, Punjab, 140413, India.
- Center for Waste Management and Renewable Energy, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai, 600077, India.
| | - Gholamreza Abdi
- Department of Biotechnology, Persian Gulf Research Institute, Persian Gulf University, Bushehr, 75169, Iran.
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Kumar MPS, Keerthana A, Priya, Singh SK, Rai D, Jaiswal A, Reddy MSS. Exploration of culturable bacterial associates of aphids and their interactions with entomopathogens. Arch Microbiol 2024; 206:96. [PMID: 38349547 DOI: 10.1007/s00203-024-03830-x] [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: 10/31/2023] [Revised: 12/27/2023] [Accepted: 01/01/2024] [Indexed: 02/15/2024]
Abstract
Aphids shelter several bacteria that benefit them in various ways. The associates having an obligatory relationship are non-culturable, while a few of facultative associates are culturable in insect cell lines, axenic media or standard microbiology media. In the present investigation, isolation, and characterization of the culturable bacterial associates of various aphid species, viz., Rhopalosiphum maidis, Rhopalosiphum padi, Sitobion avenae, Schizaphis graminum, and Lipaphis erysimi pseudobrassicae were carried out. A total of 42 isolates were isolated using different growth media, followed by their morphological, biochemical, and molecular characterization. The isolated culturable bacterial associates were found to belong to the genera Acinetobacter, Bacillus, Brevundimonas, Cytobacillus, Fictibacillus, Planococcus, Priestia, Pseudomonas, Staphylococcus, Sutcliffiella, and Tumebacillus which were grouped under seven families of four different orders of phyla Bacillota (Firmicutes) and Pseudomonata (Proteobacteria). Symbiont-entomopathogen interaction study was also conducted, in which the quantification of colony forming units of culturable bacterial associates of entomopathogenic fungal-treated aphids led us to the assumption that the bacterial load in aphid body can be altered by the application of entomopathogens. Whereas, the mycelial growth of entomopathogens Akanthomyces lecanii and Metarhizium anisopliae was found uninhibited by the bacterial associates obtained from Sitobion avenae and Rhopalosiphum padi. Analyzing persistent aphid microflora and their interactions with entomopathogens enhances our understanding of aphid resistance. It also fosters the development of innovative solutions for agricultural pest management, highlighting the intricate dynamics of symbiotic relationships in pest management strategies.
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Affiliation(s)
- M P Shireesh Kumar
- Dr. Rajendra Prasad Central Agricultural University, Pusa, Samastipur, 848125, Bihar, India
| | - Alagesan Keerthana
- Dr. Rajendra Prasad Central Agricultural University, Pusa, Samastipur, 848125, Bihar, India
| | - Priya
- Dr. Rajendra Prasad Central Agricultural University, Pusa, Samastipur, 848125, Bihar, India
| | - Satish Kumar Singh
- Dr. Rajendra Prasad Central Agricultural University, Pusa, Samastipur, 848125, Bihar, India
| | - Dinesh Rai
- Dr. Rajendra Prasad Central Agricultural University, Pusa, Samastipur, 848125, Bihar, India
| | - Aman Jaiswal
- Dr. Rajendra Prasad Central Agricultural University, Pusa, Samastipur, 848125, Bihar, India
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Banihashemian SN, Jamali S, Golmohammadi M, Noorizadeh S, Atighi MR. Reaction of Commercial Cultivars of Kiwifruit to Infection by Root-knot Nematode and Its Biocontrol Using Endophytic Bacteria. J Nematol 2023; 55:20230020. [PMID: 37284000 PMCID: PMC10241307 DOI: 10.2478/jofnem-2023-0020] [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: 02/13/2023] [Indexed: 06/08/2023] Open
Abstract
Root-knot nematodes (RKN) cause considerable economic losses to kiwifruit production annually. Screening of resistant cultivars has been one of the long-standing methods to manage root-knot nematodes. Here, the reaction of the four most common commercial cultivars of kiwifruit, namely, Actinidia chinensis var. deliciosa cv. Hayward, A. chinensis var. deliciosa cv. Abbott, A. chinensis var. deliciosa cv. Bruno, and A. chinensis var. chinensis cv. Haegeum (commonly known as 'Golden' kiwifruit) to infection by the RKN, Meloidogyne incognita, was evaluated. Among examined cultivars 'Golden' was the most susceptible, having on average 52.8 galls, 56.1 egg masses per gram of root, and 642 J2 population per 200 gram of soil. 'Bruno' showed the highest resistance, with 3.3 galls, 4.1 egg masses per gram of root, and 79 J2 in 200 g of soil. Then, two potential biological control agents, namely Priestia megaterium 31.en and Agrobacterium tumefaciens 19.en were used on 'Hayward' seedlings against M. incognita and showed a significant reduction in the number of galls and egg masses on roots, juvenile population in the soil, and increased the growth parameters of the plants compared to non-treated seedlings. We demonstrated that integrated management using resistant cultivars and biological control can provide a safe and economic method to control RKN, and these resistant cultivars can be used in breeding programs.
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Affiliation(s)
| | - Salar Jamali
- Plant Protection Department, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran
| | - Morteza Golmohammadi
- Horticultural Science Research Institute, Citrus and Subtropical Fruits Research Center, Agricultural Research Education and Extension Organization (AREEO), Ramsar, Iran
| | - Sina Noorizadeh
- Plant Protection Department, Agriculture Faculty, Tabriz University, Tabriz, Iran
| | - Mohammad Reza Atighi
- Department of Plant Pathology, Faculty of Agriculture, Tarbiat Modares University, Tehran, Iran
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