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Zhou Y, Chen J, Feng Y, Xiang P, Li J, Chen L, Guo Y. Biocontrol Potential of Bacillus strains against soybean cyst nematode (Heterodera glycines) and for promotion of soybean growth. BMC Microbiol 2024; 24:371. [PMID: 39342079 DOI: 10.1186/s12866-024-03514-y] [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: 02/06/2024] [Accepted: 09/11/2024] [Indexed: 10/01/2024] Open
Abstract
The soybean cyst nematode (SCN, Heterodera glycines) is the most yield-limiting pathogen in soybeans worldwide. Using chemical pesticides to control this disease is harmful to human and environment. It is urgent to develop environment-friendly nematicides. The aim of this study was to discover novel biocontrol agents on H. glycines control and soybean growth under greenhouse and field conditions Eight Bacillus strains were isolated from soil rhizosphere soils and the stability and efficiency of H. glycines was assessed in greenhouse and field experiments in 2021 and 2022. In particular, the Ba2-6 strain had the highest potential, because it was a biocontrol agent against H. glycines shown to cause 93.85% juvenile mortality. Furthermore, strains Ba 1-7, Ba2-4, and Ba2-6 effectively reduced the number of females and improved the soybean seed number per plant. Based on their morphological, physiological, biochemical and molecular (16 S rRNA) characteristics, the three strains were identified as B. aryabhattai (Ba1-7), B. megatherium (Ba2-4), and B. halotolerans (Ba2-6). The ability of Ba2-6 to induce systemic resistance to H. glycines in soybeans was investigated by the split-root system and real-time quantitative PCR experiments. The results indicated that the Ba2-6 strain induced systemic resistance to suppress the penetration of H. glycines, and enhanced gene expression of PR1, PR3a, PR5, and NPR1-2, involved in the salicylic acid and jasmonic acid pathways. The study suggests that the strains of B. aryabhattai Ba1-7, B. megatherium Ba2-4, and B. halotolerans Ba2-6 can be considered as effective biocontrol agents to control H. glycines. Further, B. halotolerans Ba2-6 not only promotes soybean growth but also enhances resistance to H. glycines by regulating defense-related gene expression and inducing systemic resistance in soybean.
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Affiliation(s)
- Yuanyuan Zhou
- College of Agronomy, Heilongjiang Bayi Agricultural University, Daqing Heilongjiang, China
- Heilongjiang Provincial Key Laboratory of Crop-Pest Interaction Biology and Ecological Control, Heilongjiang Bayi Agricultural University, Daqing, China
| | - Jingsheng Chen
- College of Biology and Food Engineering, Chongqing Three Gorges University, Chongqing, Sichuan, China
| | - Yaxing Feng
- Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao, Shandong, China
| | - Peng Xiang
- Heihe Branch, Heilongjiang Academy of Agricultural Sciences, Heihe, Heilongjiang, China
| | - Jing Li
- College of Agronomy, Heilongjiang Bayi Agricultural University, Daqing Heilongjiang, China
| | - Lijie Chen
- College of Plant Protection, Nematology Institute of Northern China, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Yongxia Guo
- College of Agronomy, Heilongjiang Bayi Agricultural University, Daqing Heilongjiang, China.
- Key Laboratory of Low-carbon Green Agriculture in Northeastern China, Ministry of Agriculture and Rural Affairs P. R., Daqing, China.
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Shi Q, Fu Q, Zhang J, Hao G, Liang C, Duan F, Ma J, Zhao H, Song W. Paenibacillus polymyxa J2-4 induces cucumber to enrich rhizospheric Pseudomonas and contributes to Meloidogyne incognita management under field conditions. PEST MANAGEMENT SCIENCE 2024. [PMID: 39319624 DOI: 10.1002/ps.8429] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2024] [Revised: 08/22/2024] [Accepted: 09/06/2024] [Indexed: 09/26/2024]
Abstract
BACKGROUND Root knot nematodes (RKNs) pose a great threat to agricultural production worldwide. The bacterial nematocides have received increasing attention due to their safe and efficient control against RKNs. Here, we investigated the biocontrol efficacy of Paenibacillus polymyxa J2-4 against Meloidogyne incognita in the field and analyzed the rhizosphere microbiome of cucumber under nematode infection after application of the J2-4 strain. Furthermore, a biomarker strain of Pseudomonas spp. was isolated from the J2-4-inoculated rhizosphere soil, and its nematocidal activity and growth-promoting effect on host plants were determined. In addition, chemotaxis assay of P. fluroescens ZJ5 toward root exudates was carried out. RESULTS The field experiment demonstrated that P. polymyxa J2-4 could effectively suppressed gall formation in cucumber plants, with the galling index reduced by 67.63% in 2022 and 65.50% in 2023, respectively, compared with controls. Meanwhile, plant height and yield were significantly increased in J2-4 treated plants compared with controls. Metagenomic analysis indicated that J2-4 altered the rhizosphere microbial communities. The relative abundance of Pseudomonas spp. was notably enhanced in the J2-4 group, which was consistent with Linear discriminant analysis Effect Size results that Pseudomonas was determined as one of the biomarkers in the J2-4 group. Furthermore, the ZJ5 strain, one of the biomarker Pseudomonas strains, was isolated from the J2-4-inoculated rhizosphere soil and was identified as Pseudomonas fluorescens. In addition, P. fluorescens ZJ5 exhibited high nematicidal activity in vitro and in vivo, with 99.20% of the mortality rate of M. incognita at 24 h and 69.75% of gall index reduction. The biocontrol efficiency of the synthetic community of ZJ5 plus J2-4 was superior to that of any other single bacteria against M. incognita. Additionally, ZJ5 exhibited great chemotaxis ability toward root exudates inoculated with J2-4. CONCLUSION Paenibacillus polymyxa J2-4 has good potential in the biological control against M. incognita under field conditions. Enrichment of the beneficial bacteria Pseudomonas fluorescens ZJ5 in the J2-4-inoculated rhizosphere soil contributes to M. incognita management. © 2024 Society of Chemical Industry.
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Affiliation(s)
- Qianqian Shi
- Shandong Engineering Research Center for Environment-Friendly Agricultural Pest Management, College of Plant Health and Medicine, Qingdao Agricultural University, Qingdao, China
| | - Qi Fu
- Shandong Engineering Research Center for Environment-Friendly Agricultural Pest Management, College of Plant Health and Medicine, Qingdao Agricultural University, Qingdao, China
| | - Jie Zhang
- Shandong Engineering Research Center for Environment-Friendly Agricultural Pest Management, College of Plant Health and Medicine, Qingdao Agricultural University, Qingdao, China
| | - Guangyang Hao
- Shandong Engineering Research Center for Environment-Friendly Agricultural Pest Management, College of Plant Health and Medicine, Qingdao Agricultural University, Qingdao, China
| | - Chen Liang
- Shandong Engineering Research Center for Environment-Friendly Agricultural Pest Management, College of Plant Health and Medicine, Qingdao Agricultural University, Qingdao, China
| | - Fangmeng Duan
- Shandong Engineering Research Center for Environment-Friendly Agricultural Pest Management, College of Plant Health and Medicine, Qingdao Agricultural University, Qingdao, China
| | - Juan Ma
- Plant Protection Institute, Hebei Academy of Agriculture and Forestry Sciences/Key Laboratory of IPM on Crops in Northern Region of North China, MARA China/Hebei IPM Innovation Center/International Science and Technology Joint Research Center on IPM of Hebei Province, Baoding, China
| | - Honghai Zhao
- Shandong Engineering Research Center for Environment-Friendly Agricultural Pest Management, College of Plant Health and Medicine, Qingdao Agricultural University, Qingdao, China
| | - Wenwen Song
- Shandong Engineering Research Center for Environment-Friendly Agricultural Pest Management, College of Plant Health and Medicine, Qingdao Agricultural University, Qingdao, China
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He N, Zhou S, Zhou C, Yang W, Zhang S, Yan D, Ji X, Liu W. Entomopathogenic Bacillus cereus impairs the fitness of the spotted-wing drosophila, Drosophila suzukii. INSECT SCIENCE 2024. [PMID: 39169715 DOI: 10.1111/1744-7917.13439] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2024] [Revised: 07/22/2024] [Accepted: 07/23/2024] [Indexed: 08/23/2024]
Abstract
Drosophila suzukii is a notorious pest which causes devastating damage to thin-skinned fruits, and the larvae feed on the fruit, causing extensive agricultural economic loss. The current application of insecticides to manage this pest results in serious resistance and environmental hazards, so an alternative strategy for D. suzukii biocontrol is urgently needed. Here, we reported that entomopathogenic Bacillus cereus has the potential to biocontrol D. suzukii. We isolated and identified the bacterial strain, B. cereus H1, that was detrimental to the fitness of both D. suzukii progenies and parents. D. suzukii was robustly repelled to depositing eggs on the halves with metabolites of B. cereus H1. Both males and females of D. suzukii were susceptible to B. cereus H1. B. cereus H1 significantly arrested larval development with at least 40% lethal larvae. The median lethal time (LT50) of males and females of D. suzukii challenged with B. cereus H1 was 3 and 2 d, respectively. Moreover, B. cereus H1 disrupted the intestinal integrity and pH value of D. suzukii and resulted in an increase in bacterial load of guts and hemolymph. Mechanistically, infection of B. cereus H1 led to the activation of the dual oxidase (DUOX)-ROS-Jun N-terminal kinase (JNK) pathway. The findings showed that the entomopathogen B. cereus H1 could potentially act as a biological control agent against D. suzukii, advancing fundamental concepts of integrated pest management programs against D. suzukii.
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Affiliation(s)
- Nana He
- School of Plant Protection, Anhui Agricultural University; Anhui Province Key Laboratory of Crop Integrated Pest Management, Hefei, China
| | - Shaojie Zhou
- School of Plant Protection, Anhui Agricultural University; Anhui Province Key Laboratory of Crop Integrated Pest Management, Hefei, China
| | - Chuanming Zhou
- School of Plant Protection, Anhui Agricultural University; Anhui Province Key Laboratory of Crop Integrated Pest Management, Hefei, China
| | - Weikang Yang
- School of Plant Protection, Anhui Agricultural University; Anhui Province Key Laboratory of Crop Integrated Pest Management, Hefei, China
| | - Sheng Zhang
- School of Plant Protection, Anhui Agricultural University; Anhui Province Key Laboratory of Crop Integrated Pest Management, Hefei, China
| | - Deqiang Yan
- School of Plant Protection, Anhui Agricultural University; Anhui Province Key Laboratory of Crop Integrated Pest Management, Hefei, China
| | - Xiaowen Ji
- School of Plant Protection, Anhui Agricultural University; Anhui Province Key Laboratory of Crop Integrated Pest Management, Hefei, China
| | - Wei Liu
- School of Plant Protection, Anhui Agricultural University; Anhui Province Key Laboratory of Crop Integrated Pest Management, Hefei, China
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Cao Y, Lu N, Yang D, Mo M, Zhang KQ, Li C, Shang S. Root-knot nematode infections and soil characteristics significantly affected microbial community composition and assembly of tobacco soil microbiota: a large-scale comparison in tobacco-growing areas. Front Microbiol 2023; 14:1282609. [PMID: 38107871 PMCID: PMC10722292 DOI: 10.3389/fmicb.2023.1282609] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Accepted: 10/23/2023] [Indexed: 12/19/2023] Open
Abstract
Introduction Tobacco root-knot nematode (RKN) is a highly destructive soil-borne disease worldwide. However, there is a lack of research on the relationship between RKN and tobacco root microbial community composition under large-scale geographical conditions in China. Methods In this study, we collected 65 samples from 28 main tobacco-growing areas across 10 provinces in China and conducted 16S rDNA sequencing to investigate the dynamic microbial changes in tobacco soil infected by RKN compared to healthy tobacco soil. Based on the analysis of rhizosphere soil bacterial communities, changes after RKN infection, and soil environmental factors. Results We found the 28 tobacco-growing areas could be divided into two distinct groups with different microbial compositions and varying responses to RKN infection. In group1 of the provinces of Anhui, Henan, Shanxi, and Heilongjiang, Vicinamibacteria dominated the bacterial community, while Acidobacteriae was present in low abundance. In contrast, group2 of the other six provinces (Yunnan, Guizhou, Chongqing, Guangxi, Hubei, and Shandong) exhibited an opposite pattern. After infected by RKN, the genera Chitinophaga increased significant in group 1, while the genera Rhodococcus in group 2 exhibited a substantial increase. Alpha-diversity analysis revealed that RKN-infected tobacco exhibited a richer and more diverse rhizosphere soil bacterial community compared to healthy tobacco in most growing areas. A total of 12 kinds of soil environmental factors were measured in healthy and RKN-infected tobacco soil, and based on the co-occurrence and correlation analysis between environmental factors and microbial species, the pH level, calcium (Ca), magnesium (Mg), phosphorus (P), iron (Fe), and sodium (Na) were identified as key environmental factors influencing the population composition of rhizosphere microorganisms during RKN infection. We observed that RKN infection further increased the pH in weakly alkaline group 1 soil, while weakly acidic group 2 soil experienced a further decrease in pH. Furthermore, we identified three genera as potential biocontrol or plant growth-promoting bacteria for tobacco. Discussion These findings provide valuable reference data for managing RKN disease in different tobacco-growing areas and contribute to the exploration of new and effective biological control methods.
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Affiliation(s)
- Yi Cao
- Guizhou Academy of Tobacco Science, Guiyang, Guizhou, China
| | - Ning Lu
- Guizhou Academy of Tobacco Science, Guiyang, Guizhou, China
| | - Dongmei Yang
- Guizhou Academy of Tobacco Science, Guiyang, Guizhou, China
| | - Minghe Mo
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan University, Kunming, Yunnan, China
| | - Ke-Qin Zhang
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan University, Kunming, Yunnan, China
| | - Caibin Li
- Bijie Tobacco Company of Guizhou Province, Bijie, Guizhou, China
| | - Shenghua Shang
- Guizhou Academy of Tobacco Science, Guiyang, Guizhou, China
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Stucky T, Hochstrasser M, Meyer S, Segessemann T, Ruthes AC, Ahrens CH, Pelludat C, Dahlin P. A Novel Robust Screening Assay Identifies Pseudomonas Strains as Reliable Antagonists of the Root-Knot Nematode Meloidogyne incognita. Microorganisms 2023; 11:2011. [PMID: 37630571 PMCID: PMC10459205 DOI: 10.3390/microorganisms11082011] [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: 07/05/2023] [Revised: 07/27/2023] [Accepted: 08/03/2023] [Indexed: 08/27/2023] Open
Abstract
Forty-four bacterial strains isolated from greenhouse soil and beetroots were tested for their antagonistic activity against the plant-parasitic root-knot nematode (RKN) Meloidogyne incognita, which causes significant yield losses in a number of important crops worldwide. Through a novel combination of in vitro and on planta screening assays, Pseudomonas spp. 105 and 108 were identified as the most promising bacterial isolates. Both strains were evaluated for their potential to control different RKN population densities and as root protectants against nematode infestation. Regardless of the application method, both strains significantly reduced root galling caused by M. incognita. These two strains were subjected to whole genome sequencing and de novo genome assembly as a basis for phylogenetic and future functional characterization. Phylogenetic analysis revealed that both Pseudomonas strains cluster within the Pseudomonas fluorescens clade among previously characterized RKN antagonists and Pseudomonas-based biocontrol agents of plant diseases.
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Affiliation(s)
- Tobias Stucky
- Entomology and Nematology, Plant Protection, Agroscope, Müller-Thurgau-Strasse 29, 8820 Wädenswil, Switzerland
| | - Miro Hochstrasser
- Entomology and Nematology, Plant Protection, Agroscope, Müller-Thurgau-Strasse 29, 8820 Wädenswil, Switzerland
| | - Silvan Meyer
- Entomology and Nematology, Plant Protection, Agroscope, Müller-Thurgau-Strasse 29, 8820 Wädenswil, Switzerland
| | - Tina Segessemann
- Method Development and Analytics, Agroscope, Reckenholzstrasse 190, 8046 Zürich, Switzerland
| | | | - Christian H. Ahrens
- Method Development and Analytics, Agroscope, Reckenholzstrasse 190, 8046 Zürich, Switzerland
- Swiss Institute of Bioinformatics—SIB, Reckenholzstrasse 190, 8046 Zurich, Switzerland
| | - Cosima Pelludat
- Virology, Bacteriology and Phytoplasmology, Plant Protection, Agroscope, 1260 Nyon, Switzerland
| | - Paul Dahlin
- Entomology and Nematology, Plant Protection, Agroscope, Müller-Thurgau-Strasse 29, 8820 Wädenswil, Switzerland
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Chavarria-Quicaño E, Contreras-Jácquez V, Carrillo-Fasio A, De la Torre-González F, Asaff-Torres A. Native Bacillus paralicheniformis isolate as a potential agent for phytopathogenic nematodes control. Front Microbiol 2023; 14:1213306. [PMID: 37588888 PMCID: PMC10425774 DOI: 10.3389/fmicb.2023.1213306] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Accepted: 07/07/2023] [Indexed: 08/18/2023] Open
Abstract
Phytopathogenic nematodes (PPNs) are responsible for substantial damages within agricultural crops worldwide which can be controlled employing beneficial microorganisms and/or their metabolites in an ecofriendly way. Nevertheless, the success of the control regards not only on the virulence of the strains or the toxicity of their metabolites but also on their ability to colonize and remain in the rhizospheric environment, particularly in those crops affected by abiotic stresses promoted by the climate change. Consequently, the bioprospection of beneficial microorganisms able to control PPNs and to thrive in adverse conditions has attracted attention. On this way, deserts are perfect ecological niches to isolate microorganisms adapted to harsh enviroments. The purpose of this research was to isolate and characterize bacteria from rhizospheric soil samples collected in the Northwestern Desert of Mexico with potential for PPNs control. As first screening, secretomes of each isolate were tested in vitro for nematicidal activity (NA). Then, activities from secretomes and endospores from the selected isolate were confirmed in vivo assays. From 100 thermotolerant isolates, the secretome of the isolate identified as Bacillus paralicheniformis TB197 showed the highest NA (>95%) against Meloidogyne incognita, both in vitro and in vivo tests, suppressing infections caused by M. enterolobii in tomato crops, too. In open field tests, the endospores of TB197 strain showed a reduction of 81% in the infection severity caused by M. enterolobii (p ≤ 0.05), while the galling index (GI) was reduced 84% (p ≤ 0.05) in tomato greenhouse-tests. Also, a reduction of the root necrosis (81%) caused by Radopholus similis in banana plantations (p ≤ 0.05), compared to the control was observed. Owing to their efficacy in controlling PPNs infections, the endospores and secondary metabolites of B. paralicheniformis TB197 strain could be used in bionematicidal formulations.
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Affiliation(s)
- Estefany Chavarria-Quicaño
- Laboratory of Industrial Biotechnology, Department of Food Science, Centro de Investigación en Alimentación y Desarrollo, Hermosillo, Mexico
| | - Victor Contreras-Jácquez
- Laboratory of Industrial Biotechnology, Department of Food Science, Centro de Investigación en Alimentación y Desarrollo, Hermosillo, Mexico
| | - Armando Carrillo-Fasio
- Laboratory of Nematology, Centro de Investigación en Alimentación y Desarrollo, Culiacán, Mexico
| | | | - Ali Asaff-Torres
- Laboratory of Industrial Biotechnology, Department of Food Science, Centro de Investigación en Alimentación y Desarrollo, Hermosillo, Mexico
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Massoud MA, Saad AFSA, Khalil MS, Zakaria M, Selim S. Comparative biological activity of abamectin formulations on root-knot nematodes (Meloidogyne spp.) infecting cucumber plants: in vivo and in vitro. Sci Rep 2023; 13:12418. [PMID: 37524732 PMCID: PMC10390523 DOI: 10.1038/s41598-023-39324-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Accepted: 07/24/2023] [Indexed: 08/02/2023] Open
Abstract
The root-knot nematodes (Meloidogyne spp.) are considered one of the most destructive diseases in the world. In Egypt, farmers primarily rely on chemical nematicides, which have become costly to control. Currently, abamectin is a bio-based pesticide used as an alternative tool against Meloidogyne spp. on cucumber plants (Cucumis sativus L.). During the current research, four tested abamectin formulations were DIVA (1.8% EW), RIOMECTIN (5% ME), AGRIMEC GOLD (8.4% SC) and ZORO (3.6% EC) compared with two reference nematicides namely, CROP NEMA (5% CS) and TERVIGO (2% SC). The main results showed that, in vitro study elucidated that the most effective formulations of abamectin as a larvicidal were EW with LC50 value of 21.66 µg ml-1. However, in the egg hatching test, the formulations of abamectin SC (2%) and EW were the most effective in reducing egg hatching, with LC50 values of 12.83 and 13.57 µg ml-1. The calculated relative potency values showed diversity depending on the two referenced nematicides. On the other hand, in vivo study, the results indicated that, all tested formulations of abamectin recorded general mean reductions in root galls (23.05-75.23%), egg masses (14.46-65.63%). Moreover, the total population density declined by 39.24-87.08%. Furthermore, the influence of abamectin formulations, in the presence of root-knot nematodes, on the growth of cucumber plants parameters, such as root dry weight, root length, root radius, root surface area, shoot dry weight and shoot height, as well as the content of macro-elements (N, P and K) exhibited varying levels of response.
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Affiliation(s)
- Magdy A Massoud
- Plant Protection Department, Faculty of Agriculture (Saba-Basha), Alexandria University, Alexandria, 21531, Egypt
| | - Abdel Fattah S A Saad
- Plant Protection Department, Faculty of Agriculture (Saba-Basha), Alexandria University, Alexandria, 21531, Egypt
| | - Mohamed S Khalil
- Fungicides, Bactericides and Nematicides Department, Central Agricultural Pesticides Laboratory, Agricultural Research Center, El-Sabheya, Alexandria, Egypt.
| | - Mosher Zakaria
- Plant Protection Department, Faculty of Agriculture (Saba-Basha), Alexandria University, Alexandria, 21531, Egypt
| | - Shady Selim
- Faculty of Desert and Environmental Agriculture, Department of Pesticide Chemistry and Technology, Matrouh University, Matrouh, Egypt
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Hajji-Hedfi L, Hlaoua W, Rhouma A, Al-Judaibi AA, Arcos SC, Robertson L, Ciordia S, Horrigue-Raouani N, Navas A, Abdel-Azeem AM. Biological and proteomic analysis of a new isolate of the nematophagous fungus lecanicillium sp. BMC Microbiol 2023; 23:108. [PMID: 37081392 PMCID: PMC10116813 DOI: 10.1186/s12866-023-02855-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2023] [Accepted: 04/06/2023] [Indexed: 04/22/2023] Open
Abstract
BACKGROUND In our continuing search for biologically active natural enemies from North of Africa with special reference to Tunisian fungi, our teamwork screened fungi from different ecological habitats in Tunisia. Our previous study on the comparative effectiveness of filamentous fungi in the biocontrol of Meloidogyne javanica, a taxon (Lecanicillium) showed high potentiality against M. javanica. We undertook the present study to evaluate the ability and understand the mechanism of this fungal parasite as a biological control candidate against the root-knot nematode M. javanica. This study used in vitro bioassays with fungal filtrate cultures, scanning electron microscopy (SEM) observation, and isobaric tag for relative and absolute quantitation (iTRAQ) methodology to characterize the biological and molecular features of this fungus. RESULTS The microscopic and SEM observation revealed that Lecanicillium sp. exhibited exceptional hyperparasitism against M. javanica eggs. The hyphae of this fungi penetrated the eggs, causing destructive damage to the outer eggshell. The exposure to five concentrations of Lecanicillium sp. filtrate cultures showed high inhibition of egg hatching, which increases depending on the exposure time; the best results are recorded at 50%, 75%, and 100% dilutions after seven days of exposure. The SEM observation of nematode-parasitized eggs and juveniles suggests that the production of lytic enzymes degrades the egg cuticle and fungal hyphae penetrate unhatched M.javanica juveniles. Forty-seven unique proteins were identified from the Lecanicillium sp. isolate. These proteins have signalling and stress response functions, bioenergy, metabolism, and protein synthesis and degradation. CONCLUSION Collectively, Lecanicillium sp. had ovicidal potentiality proved by SEM and proteomic analysis against root-knot nematode' eggs. This study recommended applying this biological control candidate as a bio-agent on vegetable crops grown in situ.
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Affiliation(s)
- Lobna Hajji-Hedfi
- Regional Centre of Agricultural Research of Sidi Bouzid, CRRA, Gafsa Road Km 6, B.P. 357, Sidi Bouzid, 9100, Tunisia.
| | - Wassila Hlaoua
- Department of Plant Protection and Biological Sciences, Higher Agronomic Institute of Chott-Meriem, University of Sousse, Sousse, Tunisia
| | - Abdelhak Rhouma
- Regional Centre of Agricultural Research of Sidi Bouzid, CRRA, Gafsa Road Km 6, B.P. 357, Sidi Bouzid, 9100, Tunisia
| | - Awatif A Al-Judaibi
- Department of Biological Sciences-Microbiology Section, Faculty of Science, Jeddah University, Jeddah, 21959, Saudi Arabia
| | - Susana Cobacho Arcos
- Department of Biodiversity and Evolutionary Biology, Museo Nacional de Ciencias Naturales, CSIC, Madrid, Spain
| | - Lee Robertson
- Dpto Protección Vegetal. Instituto Nacional de Investigaciones Agrarias. Carretera de la Coruña, Km 7, Madrid, 28040, Spain
| | - Sergio Ciordia
- Unidad de Proteómica Centro Nacional de Biotecnología, CSIC, Campus de Cantoblanco, Madrid, 28049, Spain
| | - Najet Horrigue-Raouani
- Department of Plant Protection and Biological Sciences, Higher Agronomic Institute of Chott-Meriem, University of Sousse, Sousse, Tunisia
| | - Alfonso Navas
- Department of Biodiversity and Evolutionary Biology, Museo Nacional de Ciencias Naturales, CSIC, Madrid, Spain
| | - Ahmed M Abdel-Azeem
- Botany and Microbiology Department, Faculty of Science, Suez Canal University, Ismailia, 41522, Egypt.
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Lu P, Shi H, Tao J, Jin J, Wang S, Zheng Q, Liu P, Xiang B, Chen Q, Xu Y, Li Z, Tan J, Cao P. Metagenomic insights into the changes in the rhizosphere microbial community caused by the root-knot nematode Meloidogyne incognita in tobacco. ENVIRONMENTAL RESEARCH 2023; 216:114848. [PMID: 36403441 DOI: 10.1016/j.envres.2022.114848] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Revised: 11/15/2022] [Accepted: 11/16/2022] [Indexed: 06/16/2023]
Abstract
Root-knot nematode (RKN) disease is a destructive soil disease that affects crop health and causes huge losses in crop production. To explore the relationships between soil environments, rhizobacterial communities, and plant health, rhizosphere bacterial communities were analyzed using metagenomic sequencing in tobacco samples with different grades of RKN disease. The results showed that the community structure and function of the plant rhizosphere were significantly correlated to the RKN disease. RKN density and urease content were key factors affecting the rhizosphere bacterial community. Urease accelerated the catabolism of urea and led to the production of high concentrations of ammonia, which directly suppressed the development of RKNs or by improving the nutritional and growth status of microorganisms that were antagonistic to RKNs. Further experiments showed that the suppression role of ammonia should be attributed to the direct inhibition of NH3. The bacterial members that were positively correlated with RKN density, contained many plant cell wall degrading enzymes, which might destroy plant cell walls and promote the colonization of RKN in tobacco roots. The analysis of metatranscriptome and metabolism demonstrated the role of these cell wall degrading enzymes. This study offers a comprehensive insight into the relationships between RKNs, bacteria, and soil environmental factors and provides new ideas for the biological control of RKNs.
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Affiliation(s)
- Peng Lu
- China Tobacco Gene Research Center, Zhengzhou Tobacco Research Institute of CNTC, Zhengzhou, China
| | - Heli Shi
- Enshi Tobacco Company of Hubei Province, Enshi, Hubei, China
| | - Jiemeng Tao
- China Tobacco Gene Research Center, Zhengzhou Tobacco Research Institute of CNTC, Zhengzhou, China
| | - Jingjing Jin
- China Tobacco Gene Research Center, Zhengzhou Tobacco Research Institute of CNTC, Zhengzhou, China
| | - Sujie Wang
- China Tobacco Gene Research Center, Zhengzhou Tobacco Research Institute of CNTC, Zhengzhou, China
| | - Qingxia Zheng
- China Tobacco Gene Research Center, Zhengzhou Tobacco Research Institute of CNTC, Zhengzhou, China
| | - Pingping Liu
- China Tobacco Gene Research Center, Zhengzhou Tobacco Research Institute of CNTC, Zhengzhou, China
| | - Bikun Xiang
- Enshi Tobacco Company of Hubei Province, Enshi, Hubei, China
| | - Qiansi Chen
- China Tobacco Gene Research Center, Zhengzhou Tobacco Research Institute of CNTC, Zhengzhou, China
| | - Yalong Xu
- China Tobacco Gene Research Center, Zhengzhou Tobacco Research Institute of CNTC, Zhengzhou, China
| | - Zefeng Li
- China Tobacco Gene Research Center, Zhengzhou Tobacco Research Institute of CNTC, Zhengzhou, China
| | - Jun Tan
- Enshi Tobacco Company of Hubei Province, Enshi, Hubei, China.
| | - Peijian Cao
- China Tobacco Gene Research Center, Zhengzhou Tobacco Research Institute of CNTC, Zhengzhou, China.
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10
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Pires D, Vicente CSL, Menéndez E, Faria JMS, Rusinque L, Camacho MJ, Inácio ML. The Fight against Plant-Parasitic Nematodes: Current Status of Bacterial and Fungal Biocontrol Agents. Pathogens 2022; 11:1178. [PMID: 36297235 PMCID: PMC9606992 DOI: 10.3390/pathogens11101178] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Revised: 10/08/2022] [Accepted: 10/10/2022] [Indexed: 11/24/2022] Open
Abstract
Plant-parasitic nematodes (PPNs) are among the most notorious and underrated threats to food security and plant health worldwide, compromising crop yields and causing billions of dollars of losses annually. Chemical control strategies rely heavily on synthetic chemical nematicides to reduce PPN population densities, but their use is being progressively restricted due to environmental and human health concerns, so alternative control methods are urgently needed. Here, we review the potential of bacterial and fungal agents to suppress the most important PPNs, namely Aphelenchoides besseyi, Bursaphelenchus xylophilus, Ditylenchus dipsaci, Globodera spp., Heterodera spp., Meloidogyne spp., Nacobbus aberrans, Pratylenchus spp., Radopholus similis, Rotylenchulus reniformis, and Xiphinema index.
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Affiliation(s)
- David Pires
- Instituto Nacional de Investigação Agrária e Veterinária (INIAV, I.P.), Av. da República, 2780-159 Oeiras, Portugal
- Mediterranean Institute for Agriculture, Environment and Development (MED) & Global Change and Sustainability Institute (CHANGE), Institute for Advanced Studies and Research, University of Évora, Pólo da Mitra, Apartado 94, 7006-554 Évora, Portugal
| | - Cláudia S. L. Vicente
- Instituto Nacional de Investigação Agrária e Veterinária (INIAV, I.P.), Av. da República, 2780-159 Oeiras, Portugal
- Mediterranean Institute for Agriculture, Environment and Development (MED) & Global Change and Sustainability Institute (CHANGE), Institute for Advanced Studies and Research, University of Évora, Pólo da Mitra, Apartado 94, 7006-554 Évora, Portugal
| | - Esther Menéndez
- Mediterranean Institute for Agriculture, Environment and Development (MED) & Global Change and Sustainability Institute (CHANGE), Institute for Advanced Studies and Research, University of Évora, Pólo da Mitra, Apartado 94, 7006-554 Évora, Portugal
- Department of Microbiology and Genetics, Institute for Agribiotechnology Research (CIALE), Universidad de Salamanca, 37007 Salamanca, Spain
| | - Jorge M. S. Faria
- Instituto Nacional de Investigação Agrária e Veterinária (INIAV, I.P.), Av. da República, 2780-159 Oeiras, Portugal
- Mediterranean Institute for Agriculture, Environment and Development (MED) & Global Change and Sustainability Institute (CHANGE), Institute for Advanced Studies and Research, University of Évora, Pólo da Mitra, Apartado 94, 7006-554 Évora, Portugal
| | - Leidy Rusinque
- Instituto Nacional de Investigação Agrária e Veterinária (INIAV, I.P.), Av. da República, 2780-159 Oeiras, Portugal
| | - Maria J. Camacho
- Instituto Nacional de Investigação Agrária e Veterinária (INIAV, I.P.), Av. da República, 2780-159 Oeiras, Portugal
- Mediterranean Institute for Agriculture, Environment and Development (MED) & Global Change and Sustainability Institute (CHANGE), Institute for Advanced Studies and Research, University of Évora, Pólo da Mitra, Apartado 94, 7006-554 Évora, Portugal
| | - Maria L. Inácio
- Instituto Nacional de Investigação Agrária e Veterinária (INIAV, I.P.), Av. da República, 2780-159 Oeiras, Portugal
- GREEN-IT Bioresources for Sustainability, Instituto de Tecnologia Química e Biológica, Universidade Nova de Lisboa (ITQB NOVA), Av. da República, 2780-157 Oeiras, Portugal
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11
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Ye S, Yan R, Li X, Lin Y, Yang Z, Ma Y, Ding Z. Biocontrol potential of Pseudomonas rhodesiae GC-7 against the root-knot nematode Meloidogyne graminicola through both antagonistic effects and induced plant resistance. Front Microbiol 2022; 13:1025727. [PMID: 36386722 PMCID: PMC9651087 DOI: 10.3389/fmicb.2022.1025727] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Accepted: 09/23/2022] [Indexed: 11/22/2022] Open
Abstract
Plant-parasitic nematodes (PPNs) cause serious damage to agricultural production worldwide. Currently, because of a lack of effective and environmental-friendly chemical nematicides, the use of microbial nematicides has been proposed as an eco-friendly management strategy to control PPNs. A nematicidal bacterium GC-7 was originally isolated from the rice rhizosphere, and was identified as Pseudomonas rhodesiae. Treatment with the fermentation supernatant of GC-7 in vitro showed a highly lethal effect on second-stage juveniles of Meloidogyne graminicola, with the mortality rate increasing to 95.82% at 24 h and egg hatching significantly inhibited, with a hatch inhibition rate of 60.65% at 96 h. The bacterium significantly reduced the level of damage caused by M. graminicola infestations to rice (Oryza sativa) in greenhouse and field experiments. Under greenhouse conditions, the GC-7 culture efficiently reduced the gall index and nematode population in rice roots and soils, as well as inhibited nematode development compared to the control. Under field conditions, application of the GC-7 consistently showed a high biocontrol efficacy against M. graminicola (with a control efficiency of 58.85%) and promoted plant growth. In addition, the inoculation of GC-7 in M. graminicola-infested rice plant fields significantly suppressed final nematode populations in soil under natural conditions. Furthermore, activities of plant defense-related enzymes, peroxidase, polyphenol oxidase, and phenylalanine ammonia-lyase were remarkably increased in plant roots treated with GC-7 compared with roots that were challenge to M. graminicola. Moreover, quantitative real-time PCR analysis showed that GC-7 significantly enhanced the expression of defense genes (PR1a, WRKY45, JaMYB, AOS2, ERF1, and ACS1) related to salicylic acid, jasmonic acid, and ethylene signaling pathways in rice roots after inoculation with GC-7 at different levels. The results indicated that GC-7 could be an effective biological component in the integrated management of M. graminicola infecting rice.
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Affiliation(s)
- Shan Ye
- College of Plant Protection, Hunan Agricultural University, Changsha, Hunan, China
- Hunan Provincial Engineering & Technology Research Center for Biopesticide and Formulation Processing, Changsha, Hunan, China
| | - Rui Yan
- College of Plant Protection, Hunan Agricultural University, Changsha, Hunan, China
| | - Xinwen Li
- Agriculture and Rural Department of Hunan Province, Plant Protection and Inspection Station, Changsha, Hunan, China
| | - Yufeng Lin
- Agriculture and Rural Department of Hunan Province, Plant Protection and Inspection Station, Changsha, Hunan, China
| | - Zhuhong Yang
- College of Plant Protection, Hunan Agricultural University, Changsha, Hunan, China
- Hunan Provincial Engineering & Technology Research Center for Biopesticide and Formulation Processing, Changsha, Hunan, China
| | - Yihang Ma
- Department of Chemical Metrology and Reference Materials, Hunan Institute of Metrology and Test, Changsha, Hunan, China
| | - Zhong Ding
- College of Plant Protection, Hunan Agricultural University, Changsha, Hunan, China
- Hunan Provincial Engineering & Technology Research Center for Biopesticide and Formulation Processing, Changsha, Hunan, China
- *Correspondence: Zhong Ding,
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12
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Sa R, He S, Han D, Liu M, Yu Y, Shang R, Song M. Isolation and identification of a new biocontrol bacteria against Salvia miltiorrhiza root rot and optimization of culture conditions for antifungal substance production using response surface methodology. BMC Microbiol 2022; 22:231. [PMID: 36180825 PMCID: PMC9524000 DOI: 10.1186/s12866-022-02628-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Accepted: 08/25/2022] [Indexed: 11/10/2022] Open
Abstract
Background S. miltiorrhiza root rot is a soil-borne disease mainly caused by Fusarium solani and Fusarium oxysporum, which has spread rapidly in China in recent years. To reduce the amount of pesticides to control this plant fungal disease, biological control using endophytic bacteria is a promising method. Many endophytic bacteria show good biocontrol potential against various plant fungal diseases. The aims of this study were to isolate and identify endophytic bacteria with antifungal activity from Salvia miltiorrhiza plant tissue. In order to increase antifungal substances production, the culture conditions of the isolated DS-R5 strain were optimized through response surface methodology. Results Thirteen endophytic bacteria with antifungal activity against the target pathogenic fungus were successfully screened. The DS-R5 strain that had the strongest antifungal activity was identified based on morphological, physiological and biochemical characteristics, 16S rRNA and gyrB sequence analysis.The results of response surface methodology experiments showed that the optimal values of the three significant factors were as follows: medium volume, 51.0 ml; initial pH, 6.7; fermentation temperature, 33.1 °C. Under these optimal culture conditions, the titer of antifungal substances produced by the DS-R5 strain was 77.6% higher than that under the initial culture conditions. Conclusions The antifungal activity of endophytic bacteria from Salvia miltiorrhiza has been demonstrated for the first time, which may benefit future crop quality and production. In addition, response surface methodology can be well applied the optimization of culture conditions for antifungal substance, which lays the foundation for further research on strain DS-R5.
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Affiliation(s)
- Rongbo Sa
- Shandong First Medical University & Shandong Academy of Medical Sciences, Taian, China
| | - Song He
- Shandong First Medical University & Shandong Academy of Medical Sciences, Taian, China
| | - Dongdong Han
- Shandong First Medical University & Shandong Academy of Medical Sciences, Taian, China
| | - Mengjiao Liu
- Shandong First Medical University & Shandong Academy of Medical Sciences, Taian, China
| | - Yunxia Yu
- Shandong First Medical University & Shandong Academy of Medical Sciences, Taian, China
| | - Rongen Shang
- Shandong First Medical University & Shandong Academy of Medical Sciences, Taian, China
| | - Meimei Song
- Shandong First Medical University & Shandong Academy of Medical Sciences, Taian, China.
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13
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Zhang R, Ouyang J, Xu X, Li J, Rehman M, Deng G, Shu J, Zhao D, Chen S, Sayyed RZ, Fahad S, Chen Y. Nematicidal Activity of Burkholderia arboris J211 Against Meloidogyne incognita on Tobacco. Front Microbiol 2022; 13:915546. [PMID: 35756018 PMCID: PMC9226767 DOI: 10.3389/fmicb.2022.915546] [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: 04/08/2022] [Accepted: 05/11/2022] [Indexed: 11/16/2022] Open
Abstract
Root-knot nematode (Meloidogyne incognita) is the most widespread nematode affecting Solanaceae crops. Due to the lack of effective measures to control this nematode, its management can be achieved, using biocontrol agents. This study investigated in vitro efficacy of the antagonistic bacterial strain J211 isolated from tobacco rhizosphere soil against M. incognita, and further assessed its role in controlling nematodes, both in pot and field trials. Phylogenetic analysis of the 16S rRNA gene sequence of strain J211 assigned to Burkholderia arboris. Culture filtrates B. arboris J211 exhibited anematicidal activity against the second-stage juveniles (J2s) of M. incognita, with a 96.6% mortality after 24 h exposure. Inoculation of J211 in tobacco roots significantly reduced the root galling caused by M. incognita, both in pot and field trials. Meanwhile, plant growth-promoting (PGP) traits results showed that J211 had outstanding IAA-producing activity, and the IAA production reached 66.60 mg L−1. In the field study, B. arboris J211 also promoted tobacco growth and increase flue-cured tobacco yield by 8.7–24.3%. Overall, B. arboris J211 as a high-yielding IAA nematicidal strain effectively controlled M. incognita and improved tobacco yield making it a promising alternative bionematocide.
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Affiliation(s)
- Renjun Zhang
- Biocontrol Engineering Research Center of Crop Disease and Pest, Yunnan University, Kunming, China.,Yunnan Engineering Research Center of Microbial Agents, Yunnan University, Kunming, China.,School of Life Science, Yunnan University, Kunming, China
| | - Jin Ouyang
- Kunming Branch of Yunnan Tobacco Company, Kunming, China
| | - Xingyang Xu
- Kunming Branch of Yunnan Tobacco Company, Kunming, China
| | - Jie Li
- Kunming Branch of Yunnan Tobacco Company, Kunming, China
| | | | - Gang Deng
- School of Agriculture, Yunnan University, Kunming, China
| | - Jie Shu
- School of Life Science, Yunnan University, Kunming, China
| | - Dake Zhao
- Biocontrol Engineering Research Center of Crop Disease and Pest, Yunnan University, Kunming, China.,Yunnan Engineering Research Center of Microbial Agents, Yunnan University, Kunming, China.,School of Ecology and Environmental Science, Yunnan University, Kunming, China
| | - Suiyun Chen
- Biocontrol Engineering Research Center of Crop Disease and Pest, Yunnan University, Kunming, China.,Yunnan Engineering Research Center of Microbial Agents, Yunnan University, Kunming, China.,School of Ecology and Environmental Science, Yunnan University, Kunming, China
| | - R Z Sayyed
- Department of Microbiology, PSGVP Mandal's S I Patil Arts, G B Patel Science and STKVS Commerce College, Shahada, India
| | - Shah Fahad
- Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresource, College of Tropical Crops, Hainan University, Haikou, China.,Department of Agronomy, The University of Haripur, Haripur, Pakistan
| | - Yaqiong Chen
- Kunming Branch of Yunnan Tobacco Company, Kunming, China
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14
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Sai Aparna Devi N, Balachandar D. Authentication of putative competitive bacterial endophytes of rice by re-isolation and DNA fingerprinting assay. J Appl Microbiol 2022; 133:1808-1820. [PMID: 35751483 DOI: 10.1111/jam.15689] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Revised: 03/30/2022] [Accepted: 06/22/2022] [Indexed: 11/26/2022]
Abstract
AIM The plant-growth-promoting putative competitive endophytes offer significant benefits to sustainable agriculture. The unworthy opportunistic and passenger endophytes are inevitable during the isolation of putative competitive endophytes. This study aimed to discriminate the putative competitive endophytes undoubtedly from the opportunistic and passenger endophytes. METHODS AND RESULTS The newly-isolated endophytes from field-grown rice were inoculated to 5-days old rice seedlings under gnotobiotic conditions. Re-isolation of the inoculated strains from the root surface, inner tissues of the whole plant, root, and shoot was performed after 5-days. All the re-isolated colonies were compared with native isolate for the homology by BOX-A1R-based repetitive extragenic palindromic-PCR (BOX-PCR) and enterobacterial repetitive intergenic consensus (ERIC-PCR) DNA fingerprints. The results revealed that the putative competitive endophyte (RE25 and RE10) showed positive for re-isolation and BOX and ERIC fingerprints for the whole plant, root, and shoot. The opportunistic (RE27 and RE8) and passenger endophytes (RE44 and RE18) failed in re-isolation either from root or shoot. The epiphytes (ZSB15 and Az204) showed negative for endophytic re-isolation and positive for surface colonization. CONCLUSION This modified procedure can discriminate the putative competitive endophytes from others. SIGNIFICANCE AND IMPACT OF THE STUDY Eliminating the opportunistic and passenger endophytes and epiphytes early by this method would help develop endophytic inoculants to enhance rice productivity.
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Affiliation(s)
- Nunna Sai Aparna Devi
- Department of Agricultural Microbiology, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu, India
| | - Danajeyan Balachandar
- Department of Agricultural Microbiology, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu, India
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15
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Biocontrol of Wheat Crown Rot Using Bacillus halotolerans QTH8. Pathogens 2022; 11:pathogens11050595. [PMID: 35631116 PMCID: PMC9143084 DOI: 10.3390/pathogens11050595] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2022] [Revised: 05/11/2022] [Accepted: 05/16/2022] [Indexed: 02/01/2023] Open
Abstract
Fusarium pseudograminearum causes crown rot in wheat. This study aimed to assess the effects of the bacterial strain QTH8 isolated from Cotinus coggygria rhizosphere soil against F. pseudograminearum. Bacterial strain QTH8 was identified as Bacillus halotolerans in accordance with the phenotypic traits and the phylogenetic analysis of 16S rDNA and gyrB gene sequence. Culture filtrates of bacterial strain QTH8 inhibited the mycelial growth of F. pseudograminearum and resulted in mycelial malformation such as tumor formation, protoplast condensation, and mycelial fracture. In addition, bacterial strain QTH8 also inhibited the mycelial growth of Hainesia lythri, Pestalotiopsis sp., Botrytis cinerea, Curvularia lunata, Phyllosticta theaefolia, Fusarium graminearum, Phytophthora nicotianae, and Sclerotinia sclerotiorum. The active compounds produced by bacterial strain QTH8 were resistant to pH, ultraviolet irradiation, and low temperature, and were relatively sensitive to high temperature. After 4 h exposure, culture filtrates of bacterial strain QTH8—when applied at 5%, 10%, 15%, 20%, 25%, and 30%—significantly reduced conidial germination of F. pseudograminearum. The coleoptile infection assay proved that bacterial strain QTH8 reduced the disease index of wheat crown rot. In vivo application of QTH8 to wheat seedlings decreased the disease index of wheat crown rot and increased root length, plant height, and fresh weight. Iturin, surfactin, and fengycin were detected in the culture extract of bacterial strain QTH8 by matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF-MS). Bacterial strain QTH8 was identified for the presence of the ituC, bacA, bmyB, spaS, srfAB, fend, and srfAA genes using the specific polymerase chain reaction primers. B. halotolerans QTH8 has a vital potential for the sustainable biocontrol of wheat crown rot.
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16
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Du J, Gao Q, Ji C, Song X, Liu Y, Li H, Li C, Zhang P, Li J, Liu X. Bacillus licheniformis JF-22 to Control Meloidogyne incognita and Its Effect on Tomato Rhizosphere Microbial Community. Front Microbiol 2022; 13:863341. [PMID: 35464941 PMCID: PMC9022077 DOI: 10.3389/fmicb.2022.863341] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Accepted: 03/07/2022] [Indexed: 11/13/2022] Open
Abstract
Meloidogyne incognita is one of the most destructive soil pests, causing serious economic losses in tomato production. Here, in vitro experiments demonstrated that the Bacillus licheniformis strain JF-22 has the potential to prevent M. incognita infection. A pot experiment confirmed that B. licheniformis strain JF-22 isolated from the tomato rhizosphere soil and planted in the tomato root-knot nematode disease area effectively prevented and controlled M. incognita, reducing its negative effect on tomato growth. Additionally, the composition of volatile substances secreted by B. licheniformis strain JF-22 was analyzed using solid-phase microextraction and gas chromatography–mass spectrometry. We detected acetoin, 2,3-Butanediol, [R-(R*,R*) ]-, and hexamethyl cyclotrisiloxane as the main components among these volatiles. Using MiSeq sequencing technology and bioinformatics, we analyzed the influence of B. licheniformis strain JF-22 on the microbial community of the tomato rhizosphere. B. licheniformis strain JF-22 changed the composition of the microbial community; particularly, it significantly reduced the diversity of the fungal community. Furthermore, using the FUNGuild and PICRUSt databases, we predicted the effect of JF-22 on microbial community function. In conclusion, B. licheniformis strain JF-22 may be considered as a potential biocontrol agent against M. incognita.
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Affiliation(s)
- Jianfeng Du
- College of Forestry, Shandong Agriculture University, Taian, China.,Key Laboratory of National Forestry and Grassland Administration on Silviculture of the Lower Yellow River, Shandong Agricultural University, Taian, China.,College of Plant Protection, Shandong Agricultural University, Taian, China
| | - Qixiong Gao
- College of Forestry, Shandong Agriculture University, Taian, China.,Key Laboratory of National Forestry and Grassland Administration on Silviculture of the Lower Yellow River, Shandong Agricultural University, Taian, China
| | - Chao Ji
- College of Forestry, Shandong Agriculture University, Taian, China.,Key Laboratory of National Forestry and Grassland Administration on Silviculture of the Lower Yellow River, Shandong Agricultural University, Taian, China.,College of Biological and Agricultural Engineering, Weifang University, Weifang, China
| | - Xin Song
- College of Forestry, Shandong Agriculture University, Taian, China.,Key Laboratory of National Forestry and Grassland Administration on Silviculture of the Lower Yellow River, Shandong Agricultural University, Taian, China
| | - Yue Liu
- College of Forestry, Shandong Agriculture University, Taian, China.,Key Laboratory of National Forestry and Grassland Administration on Silviculture of the Lower Yellow River, Shandong Agricultural University, Taian, China
| | - Huying Li
- College of Forestry, Shandong Agriculture University, Taian, China.,Key Laboratory of National Forestry and Grassland Administration on Silviculture of the Lower Yellow River, Shandong Agricultural University, Taian, China
| | - Chaohui Li
- College of Forestry, Shandong Agriculture University, Taian, China.,Key Laboratory of National Forestry and Grassland Administration on Silviculture of the Lower Yellow River, Shandong Agricultural University, Taian, China
| | - Pengcheng Zhang
- College of Forestry, Shandong Agriculture University, Taian, China.,Key Laboratory of National Forestry and Grassland Administration on Silviculture of the Lower Yellow River, Shandong Agricultural University, Taian, China
| | - Jintai Li
- College of Forestry, Shandong Agriculture University, Taian, China.,Key Laboratory of National Forestry and Grassland Administration on Silviculture of the Lower Yellow River, Shandong Agricultural University, Taian, China
| | - Xunli Liu
- College of Forestry, Shandong Agriculture University, Taian, China.,Key Laboratory of National Forestry and Grassland Administration on Silviculture of the Lower Yellow River, Shandong Agricultural University, Taian, China
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17
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Yadav DK, Kaushik P, Tripathi KP, Rana VS, Yeasin M, Kamil D, Khatri D, Shakil NA. Bioefficacy evaluation of ferrocenyl chalcones against Meloidogyne incognita and Sclerotium rolfsii infestation in tomato. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART. B, PESTICIDES, FOOD CONTAMINANTS, AND AGRICULTURAL WASTES 2022; 57:192-200. [PMID: 35193479 DOI: 10.1080/03601234.2022.2042154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The present study reports, bioefficacy evaluation of effective compounds against Meloidogyne incognita and Sclerotium rolfsii in pot cultured tomato. The identified five most effective compounds, i.e. (2E)-1-(4-Methylphenyl)-3-ferrocenyl-prop-2-en-1-one (6g), (2E)-1-(4-Methoxyphenyl)-3-ferrocenyl-prop-2-en-1-one (6h), (2E)-1-(3-Bromophenyl)-3-ferrocenyl-prop-2-en-1-one (6j), (2E)-1-(2,4-Dichlorophenyl)-3-ferrocenyl-prop-2-en-1-one (6k) and (2E)-1-(3,5-Dichloro-2-hydroxyphenyl)-3-ferrocenyl-prop-2-en-1-one (6p) along with Carbofuran 3G as positive control were tested at 20, 40 and 80 ppm by soil drenching and root dipping methods. The study revealed that all plant growth parameters were positively influenced by these compounds. The presence of an electron releasing group positively influenced the efficacy, and the activity was highest in compounds 6g and 6h at 80 ppm. Based on in vitro results against S. rolfsii, (2E)-1-Ferrocenyl-3-(4-bromophenyl)-prop-2-en-1-one (3b), (2E)-1-Ferrocenyl-3-(2,6-dichlorophenyl)-prop-2-en-1-one (3o) and (2E)-1-(5-Chloro-2-hydroxyphenyl)-3-ferrocenyl-prop-2-en-1-one (6o) along with Tebuconazole 25.9% EC and Hexaconazole 5% SC as positive control were evaluated. The shoot length was found to be highest (24.50 cm) in plants treated with 3b followed by 3o and 6o at 1000 ppm. The percent disease incidence was significantly decreased as compared to control. The percent disease incidence was found to be minimum in plants treated with 3b at 1000 ppm. However, root dipping was not as effective as soil drenching. Therefore, ferrocenyl chalcone derivatives proved to be of great fungicidal and nematicidal potential opening new opportunities for expanding their effectiveness as new pest control agents.
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Affiliation(s)
- Dinesh K Yadav
- Division of Agricultural Chemicals, ICAR-Indian Agricultural Research Institute, New Delhi, India
- Division of Environmental Soil Science, ICAR-Indian Institute of Soil Science, Bhopal, India
| | - Parshant Kaushik
- Division of Agricultural Chemicals, ICAR-Indian Agricultural Research Institute, New Delhi, India
| | - Kailash Pati Tripathi
- Division of Agricultural Chemicals, ICAR-Indian Agricultural Research Institute, New Delhi, India
| | - Virendra S Rana
- Division of Agricultural Chemicals, ICAR-Indian Agricultural Research Institute, New Delhi, India
| | - Md Yeasin
- Division of Statistical Genetics, ICAR-Indian Agricultural Statistics Research Institute, New Delhi, India
| | - Deeba Kamil
- Division of Plant Pathology, ICAR-Indian Agricultural Research Institute, New Delhi, India
| | | | - Najam A Shakil
- Division of Agricultural Chemicals, ICAR-Indian Agricultural Research Institute, New Delhi, India
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18
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Sun X, Zhang R, Ding M, Liu Y, Li L. Biocontrol of the root-knot nematode Meloidogyne incognita by a nematicidal bacterium Pseudomonas simiae MB751 with cyclic dipeptide. PEST MANAGEMENT SCIENCE 2021; 77:4365-4374. [PMID: 33963810 DOI: 10.1002/ps.6470] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2020] [Revised: 03/26/2021] [Accepted: 05/08/2021] [Indexed: 06/12/2023]
Abstract
BACKGROUND Root-knot nematodes (RKNs) are harmful plant-parasitic nematodes that cause serious damage to plant hosts. In the long-term practice of RKN management, bacterial nematicides have attracted increasing attention as an effective biocontrol means. Here we determined the active substances against Meloidogyne incognita from a nematicidal bacterium, developed a biocontrol agent (BCA) based on optimized culture processes. The effects of the BCA on RKN control and plant growth-promotion were evaluated in tomato pot trials. RESULTS Pseudomonas simiae strain MB751 exhibiting significant nematicidal activity against M. incognita second-stage juveniles (J2) with approximately 80% mortality (with culture supernatant, 96% volume percentage) was isolated from a vineyard. A set of purification and identification experiments was performed to determine the main nematicidal component in MB751. A cyclic dipeptide Cyclo(L-Pro-L-Leu) was identified with a lethal concentration necessary to kill 50% of the population (LC50 ) of 65.3 μg mL-1 against M. incognita J2. Following optimization trials on culture medium/fermentation conditions, such as the single factor test, Plackett-Burman test, steepest ascent, and response surface methodology experiments, the MB751 fermentation broth was then prepared as a BCA via a cold-air drying process. The BCA and was evaluated in tomato pot experiments for effectiveness in suppressing M. incognita. Significant effects on M. incognita suppression and plant-growth promotion as well as induced systemic resistance to M. incognita of tomato, were observed. CONCLUSION The cyclic dipeptide-producing bacterium P. simiae MB751 exhibited high nematicidal activity and performance. Further development of this BCA should be pursued for the management of M. incognita in agriculture. © 2021 Society of Chemical Industry.
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Affiliation(s)
- Xiaowen Sun
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Run Zhang
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Meijuan Ding
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Yongxuan Liu
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Lin Li
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, 430070, China
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Li H, Liu G, Zhang DX, Lin X, Liu G, Xu S, Liu F, Mu W. Wheat Root Protection From Cereal Cyst Nematode ( Heterodera avenae) by Fluopyram Seed Treatment. PLANT DISEASE 2021; 105:2466-2471. [PMID: 33529065 DOI: 10.1094/pdis-08-20-1851-re] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Cereal cyst nematode (Heterodera avenae), an important plant-parasitic nematode causing yield losses of wheat, has been found in many provinces in China. It is urgent to develop an effective method of protecting wheat from H. avenae damage. Because of its novel mode of action, fluopyram has been registered for controlling root-knot nematodes on cucumber and tomato in China. However, the bioactivity of fluopyram against H. avenae and whether this seed treatment can effectively control H. avenae on wheat remains unknown. In this study, a bioactivity assay revealed that fluopyram increased the mortality of H. avenae second-stage juveniles (J2), with lethal concentrations (LC) required to kill 50% (LC50) and 90% (LC90) of 0.92 mg⋅liter-1 and 2.92 mg⋅liter-1, respectively. Hatching tests showed that the H. avenae egg hatching percent was reduced by 35.2 to 69.2% with fluopyram at rates of 1.6 to 6.4 mg⋅liter-1, and that the egg hatching period was delayed by 3 to 9 days compared with the control. During pot and field trials, fluopyram seed treatment significantly reduced the H. avenae population density and increased wheat yield by 3.0 to 13.7%. Therefore, fluopyram seed treatment is an effective approach for the management of H. avenae on wheat in China.
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Affiliation(s)
- Haolin Li
- Key Laboratory of Pesticide Toxicology and Application Technique, College of Plant Protection Shandong Agricultural University, Tai'an, Shandong 271018, People's Republic of China
- College of Plant Protection, Shandong Agricultural University, Tai'an, Shandong 271018, People's Republic of China
| | - Guang Liu
- Key Laboratory of Pesticide Toxicology and Application Technique, College of Plant Protection Shandong Agricultural University, Tai'an, Shandong 271018, People's Republic of China
- College of Plant Protection, Shandong Agricultural University, Tai'an, Shandong 271018, People's Republic of China
| | - Da-Xia Zhang
- Key Laboratory of Pesticide Toxicology and Application Technique, College of Plant Protection Shandong Agricultural University, Tai'an, Shandong 271018, People's Republic of China
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, Fujian Agriculture and Forestry University Fuzhou, Fujian 350002, People's Republic of China
| | - Xu Lin
- Key Laboratory of Pesticide Toxicology and Application Technique, College of Plant Protection Shandong Agricultural University, Tai'an, Shandong 271018, People's Republic of China
- College of Plant Protection, Shandong Agricultural University, Tai'an, Shandong 271018, People's Republic of China
| | - Guangying Liu
- Key Laboratory of Pesticide Toxicology and Application Technique, College of Plant Protection Shandong Agricultural University, Tai'an, Shandong 271018, People's Republic of China
- College of Plant Protection, Shandong Agricultural University, Tai'an, Shandong 271018, People's Republic of China
| | - Shuangyu Xu
- Key Laboratory of Pesticide Toxicology and Application Technique, College of Plant Protection Shandong Agricultural University, Tai'an, Shandong 271018, People's Republic of China
- Research Center of Pesticide Environmental Toxicology, Shandong Agricultural University, Tai'an, Shandong 271018, People's Republic of China
| | - Feng Liu
- Key Laboratory of Pesticide Toxicology and Application Technique, College of Plant Protection Shandong Agricultural University, Tai'an, Shandong 271018, People's Republic of China
- College of Plant Protection, Shandong Agricultural University, Tai'an, Shandong 271018, People's Republic of China
| | - Wei Mu
- Key Laboratory of Pesticide Toxicology and Application Technique, College of Plant Protection Shandong Agricultural University, Tai'an, Shandong 271018, People's Republic of China
- College of Plant Protection, Shandong Agricultural University, Tai'an, Shandong 271018, People's Republic of China
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Li QQ, Li JJ, Yu QT, Shang ZY, Xue CB. Mixtures of fluopyram and abamectin for management of Meloidogyne incognita in tomato. J Nematol 2021; 52:e2020-129. [PMID: 33829164 PMCID: PMC8015279 DOI: 10.21307/jofnem-2020-129] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Indexed: 11/11/2022] Open
Abstract
The southern root-knot nematode (RKN), Meloidogyne incognita, causes significant damage to vegetable production and is a major problem in greenhouse tomatoes. The effect of a combination of fluopyram and abamectin, at a mass ratio of 1:5, was studied for RKN control. Pot trials showed that fluopyram, abamectin, and their combination at three dosages increased the height, stem diameter, root fresh weight, shoot fresh weight, and the root length of tomato plants. The RKN control efficacy of the 1:5 combination at 450 g a.i./ha was 74.06% at 30 days after transplanting (DAT), and the control efficacy of the combination at 337.5 and 450 g a.i./ha differed significantly from those of other treatments at 60 DAT. The root-galling index (RGI) control efficacy of the combination at 450 g a.i./ha and of fluopyram (41.7% SC) only at 450 g a.i./ha were better than the control efficacies of other treatments, and these two treatments significantly increased root activity. Field trial results showed that the soil nematode control efficacy was similar to that of the pot trials at 30 and 60 DAT. The RGI control efficacy of the combination at 337.5 and 450 g a.i./ha and of fluopyram (41.7% SC) only at 450 g a.i./ha differed significantly from those of the two other treatments. The tomato yields of the 1:5 combination at 450 g a.i./ha were increased by 24.07 and 23.22% compared to the control in field trials during two successive years. The combination of fluopyram and abamectin provides good nematode measure, and it can increase tomato yields. It provides an effective solution for the integrated management of southern RKN.
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Affiliation(s)
- Qing-Qing Li
- Key Laboratory of Pesticide Toxicology and Application Technique, College of Plant Protection, Shandong Agricultural University, Tai'an, China
| | - Jing-Jing Li
- Key Laboratory of Pesticide Toxicology and Application Technique, College of Plant Protection, Shandong Agricultural University, Tai'an, China
| | - Qi-Tong Yu
- Key Laboratory of Pesticide Toxicology and Application Technique, College of Plant Protection, Shandong Agricultural University, Tai'an, China
| | - Ze-Yu Shang
- Key Laboratory of Pesticide Toxicology and Application Technique, College of Plant Protection, Shandong Agricultural University, Tai'an, China
| | - Chao-Bin Xue
- Key Laboratory of Pesticide Toxicology and Application Technique, College of Plant Protection, Shandong Agricultural University, Tai'an, China
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Complete genome sequence of a novel Bacillus phage, P59, that infects Bacillus oceanisediminis. Arch Virol 2020; 165:2679-2683. [PMID: 32797339 DOI: 10.1007/s00705-020-04761-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Accepted: 06/29/2020] [Indexed: 02/06/2023]
Abstract
P59, a virulent phage of Bacillus oceanisediminis, was isolated from the sediment of Weiming Lake at Peking University (Beijing, China). P59 showed the typical morphology of myovirids. The complete genome sequence of P59 is 159,363 bp in length with a G+C content of 42.34%. The genome sequence has very low similarity to the other phage genome sequences in the GenBank database, suggesting that P59 is a new phage. A total of 261 open reading frames and 15 tRNA genes were predicted. Based on its morphological and genetic traits, we propose phage P59 to be a new member of the family Herelleviridae.
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