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Chen X, Zhang Y, Chao S, Song L, Wu G, Sun Y, Chen Y, Lv B. Biocontrol potential of endophytic Bacillus subtilis A9 against rot disease of Morchella esculenta. Front Microbiol 2024; 15:1388669. [PMID: 38873148 PMCID: PMC11169702 DOI: 10.3389/fmicb.2024.1388669] [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: 02/20/2024] [Accepted: 05/06/2024] [Indexed: 06/15/2024] Open
Abstract
Introduction Morchella esculenta is a popular edible fungus with high economic and nutritional value. However, the rot disease caused by Lecanicillium aphanocladii, pose a serious threat to the quality and yield of M. esculenta. Biological control is one of the effective ways to control fungal diseases. Methods and results In this study, an effective endophytic B. subtilis A9 for the control of M. esculenta rot disease was screened, and its biocontrol mechanism was studied by transcriptome analysis. In total, 122 strains of endophytic bacteria from M. esculenta, of which the antagonistic effect of Bacillus subtilis A9 on L. aphanocladii G1 reached 72.2% in vitro tests. Biological characteristics and genomic features of B. subtilis A9 were analyzed, and key antibiotic gene clusters were detected. Scanning electron microscope (SEM) observation showed that B. subtilis A9 affected the mycelium and spores of L. aphanocladii G1. In field experiments, the biological control effect of B. subtilis A9 reached to 62.5%. Furthermore, the transcritome profiling provides evidence of B. subtilis A9 bicontrol at the molecular level. A total of 1,246 differentially expressed genes (DEGs) were identified between the treatment and control group. Gene Ontology (GO) enrichment analysis showed that a large number of DEGs were related to antioxidant activity related. Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment analysis showed that the main pathways were Nitrogen metabolism, Pentose Phosphate Pathway (PPP) and Mitogen-Activated Protein Kinases (MAPK) signal pathway. Among them, some important genes such as carbonic anhydrase CA (H6S33_007248), catalase CAT (H6S33_001409), tRNA dihydrouridine synthase DusB (H6S33_001297) and NAD(P)-binding protein NAD(P) BP (H6S33_000823) were found. Furthermore, B. subtilis A9 considerably enhanced the M. esculenta activity of Polyphenol oxidase (POD), Superoxide dismutase (SOD), Phenylal anineammonia lyase (PAL) and Catalase (CAT). Conclusion This study presents the innovative utilization of B. subtilis A9, for effectively controlling M. esculenta rot disease. This will lay a foundation for biological control in Morchella, which may lead to the improvement of new biocontrol agents for production.
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Affiliation(s)
- Xue Chen
- Biotechnology Research Institute, Key Laboratory of Agricultural Genetics and Breeding, Shanghai Academy of Agricultural Sciences, Shanghai, China
| | - Yin Zhang
- Biotechnology Research Institute, Key Laboratory of Agricultural Genetics and Breeding, Shanghai Academy of Agricultural Sciences, Shanghai, China
- Key Laboratory for Safety Assessment (Environment) of Agricultural Genetically Modified Organisms, Ministry of Agriculture and Rural Affairs, P.R, Shanghai, China
- Shanghai Professional Technology Service Platform of Agricultural Biosafety Evaluation and Testing, Shanghai Academy of Agricultural Sciences, Shanghai, China
| | - ShengQian Chao
- Biotechnology Research Institute, Key Laboratory of Agricultural Genetics and Breeding, Shanghai Academy of Agricultural Sciences, Shanghai, China
- Key Laboratory for Safety Assessment (Environment) of Agricultural Genetically Modified Organisms, Ministry of Agriculture and Rural Affairs, P.R, Shanghai, China
- Shanghai Professional Technology Service Platform of Agricultural Biosafety Evaluation and Testing, Shanghai Academy of Agricultural Sciences, Shanghai, China
| | - LiLi Song
- Biotechnology Research Institute, Key Laboratory of Agricultural Genetics and Breeding, Shanghai Academy of Agricultural Sciences, Shanghai, China
- Key Laboratory for Safety Assessment (Environment) of Agricultural Genetically Modified Organisms, Ministry of Agriculture and Rural Affairs, P.R, Shanghai, China
- Shanghai Professional Technology Service Platform of Agricultural Biosafety Evaluation and Testing, Shanghai Academy of Agricultural Sciences, Shanghai, China
| | - GuoGan Wu
- Biotechnology Research Institute, Key Laboratory of Agricultural Genetics and Breeding, Shanghai Academy of Agricultural Sciences, Shanghai, China
- Key Laboratory for Safety Assessment (Environment) of Agricultural Genetically Modified Organisms, Ministry of Agriculture and Rural Affairs, P.R, Shanghai, China
- Shanghai Professional Technology Service Platform of Agricultural Biosafety Evaluation and Testing, Shanghai Academy of Agricultural Sciences, Shanghai, China
| | - Yu Sun
- Biotechnology Research Institute, Key Laboratory of Agricultural Genetics and Breeding, Shanghai Academy of Agricultural Sciences, Shanghai, China
- Key Laboratory for Safety Assessment (Environment) of Agricultural Genetically Modified Organisms, Ministry of Agriculture and Rural Affairs, P.R, Shanghai, China
- Shanghai Professional Technology Service Platform of Agricultural Biosafety Evaluation and Testing, Shanghai Academy of Agricultural Sciences, Shanghai, China
| | - YiFan Chen
- Biotechnology Research Institute, Key Laboratory of Agricultural Genetics and Breeding, Shanghai Academy of Agricultural Sciences, Shanghai, China
- Key Laboratory for Safety Assessment (Environment) of Agricultural Genetically Modified Organisms, Ministry of Agriculture and Rural Affairs, P.R, Shanghai, China
- Shanghai Professional Technology Service Platform of Agricultural Biosafety Evaluation and Testing, Shanghai Academy of Agricultural Sciences, Shanghai, China
| | - BeiBei Lv
- Biotechnology Research Institute, Key Laboratory of Agricultural Genetics and Breeding, Shanghai Academy of Agricultural Sciences, Shanghai, China
- Key Laboratory for Safety Assessment (Environment) of Agricultural Genetically Modified Organisms, Ministry of Agriculture and Rural Affairs, P.R, Shanghai, China
- Shanghai Professional Technology Service Platform of Agricultural Biosafety Evaluation and Testing, Shanghai Academy of Agricultural Sciences, Shanghai, China
- Shanghai Co-Elite Agricultural Sci-Tech (Group) Co., Ltd., Shanghai, China
- CIMMYT-China Specialty Maize Research Center, Shanghai, China
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Li W, Sun L, Wu H, Gu W, Lu Y, Liu C, Zhang J, Li W, Zhou C, Geng H, Li Y, Peng H, Shi C, Wang D, Peng G. Bacillus velezensis YXDHD1-7 Prevents Early Blight Disease by Promoting Growth and Enhancing Defense Enzyme Activities in Tomato Plants. Microorganisms 2024; 12:921. [PMID: 38792750 PMCID: PMC11124510 DOI: 10.3390/microorganisms12050921] [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: 04/05/2024] [Revised: 04/20/2024] [Accepted: 04/22/2024] [Indexed: 05/26/2024] Open
Abstract
Bacillus velezensis is well known as a plant growth-promoting rhizobacteria (PGPR) and biocontrol agent. Nevertheless, there are very few reports on the study of B. velezensis on tomato early blight, especially the biocontrol effects among different inoculation concentrations. In this study, an IAA-producing strain, Bacillus velezensis YXDHD1-7 was isolated from the tomato rhizosphere soil, which had the strongest inhibitory effect against Alternaria solani. Inoculation with bacterial suspensions of this strain promoted the growth of tomato seedlings effectively. Furthermore, inoculations at 106, 107, and 108 cfu/mL resulted in control efficacies of 100%, 83.15%, and 69.90%, respectively. Genome sequencing showed that it possesses 22 gene clusters associated with the synthesis of antimicrobial metabolites and genes that are involved in the production of IAA. Furthermore, it may be able to produce spermidine and volatile compounds that also enhance plant growth and defense responses. Our results suggest that strain YXDHD1-7 prevents early blight disease by promoting growth and enhancing the defense enzyme activities in tomato plants. This strain is a promising candidate for an excellent microbial inoculant that can be used to enhance tomato production.
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Affiliation(s)
- Wangxi Li
- College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China;
- Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Key Laboratory of Nutrient Cycling and Farmland Conservation of Guangdong Province, Guangzhou 510640, China; (L.S.); (H.W.); (W.G.); (Y.L.); (C.L.); (J.Z.); (W.L.); (C.Z.); (H.G.); (Y.L.); (H.P.); (C.S.)
| | - Lili Sun
- Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Key Laboratory of Nutrient Cycling and Farmland Conservation of Guangdong Province, Guangzhou 510640, China; (L.S.); (H.W.); (W.G.); (Y.L.); (C.L.); (J.Z.); (W.L.); (C.Z.); (H.G.); (Y.L.); (H.P.); (C.S.)
| | - Hangtao Wu
- Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Key Laboratory of Nutrient Cycling and Farmland Conservation of Guangdong Province, Guangzhou 510640, China; (L.S.); (H.W.); (W.G.); (Y.L.); (C.L.); (J.Z.); (W.L.); (C.Z.); (H.G.); (Y.L.); (H.P.); (C.S.)
| | - Wenjie Gu
- Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Key Laboratory of Nutrient Cycling and Farmland Conservation of Guangdong Province, Guangzhou 510640, China; (L.S.); (H.W.); (W.G.); (Y.L.); (C.L.); (J.Z.); (W.L.); (C.Z.); (H.G.); (Y.L.); (H.P.); (C.S.)
| | - Yusheng Lu
- Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Key Laboratory of Nutrient Cycling and Farmland Conservation of Guangdong Province, Guangzhou 510640, China; (L.S.); (H.W.); (W.G.); (Y.L.); (C.L.); (J.Z.); (W.L.); (C.Z.); (H.G.); (Y.L.); (H.P.); (C.S.)
| | - Chong Liu
- Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Key Laboratory of Nutrient Cycling and Farmland Conservation of Guangdong Province, Guangzhou 510640, China; (L.S.); (H.W.); (W.G.); (Y.L.); (C.L.); (J.Z.); (W.L.); (C.Z.); (H.G.); (Y.L.); (H.P.); (C.S.)
| | - Jiexin Zhang
- Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Key Laboratory of Nutrient Cycling and Farmland Conservation of Guangdong Province, Guangzhou 510640, China; (L.S.); (H.W.); (W.G.); (Y.L.); (C.L.); (J.Z.); (W.L.); (C.Z.); (H.G.); (Y.L.); (H.P.); (C.S.)
| | - Wanling Li
- Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Key Laboratory of Nutrient Cycling and Farmland Conservation of Guangdong Province, Guangzhou 510640, China; (L.S.); (H.W.); (W.G.); (Y.L.); (C.L.); (J.Z.); (W.L.); (C.Z.); (H.G.); (Y.L.); (H.P.); (C.S.)
| | - Changmin Zhou
- Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Key Laboratory of Nutrient Cycling and Farmland Conservation of Guangdong Province, Guangzhou 510640, China; (L.S.); (H.W.); (W.G.); (Y.L.); (C.L.); (J.Z.); (W.L.); (C.Z.); (H.G.); (Y.L.); (H.P.); (C.S.)
| | - Haoyang Geng
- Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Key Laboratory of Nutrient Cycling and Farmland Conservation of Guangdong Province, Guangzhou 510640, China; (L.S.); (H.W.); (W.G.); (Y.L.); (C.L.); (J.Z.); (W.L.); (C.Z.); (H.G.); (Y.L.); (H.P.); (C.S.)
| | - Yaying Li
- Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Key Laboratory of Nutrient Cycling and Farmland Conservation of Guangdong Province, Guangzhou 510640, China; (L.S.); (H.W.); (W.G.); (Y.L.); (C.L.); (J.Z.); (W.L.); (C.Z.); (H.G.); (Y.L.); (H.P.); (C.S.)
| | - Huanlong Peng
- Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Key Laboratory of Nutrient Cycling and Farmland Conservation of Guangdong Province, Guangzhou 510640, China; (L.S.); (H.W.); (W.G.); (Y.L.); (C.L.); (J.Z.); (W.L.); (C.Z.); (H.G.); (Y.L.); (H.P.); (C.S.)
| | - Chaohong Shi
- Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Key Laboratory of Nutrient Cycling and Farmland Conservation of Guangdong Province, Guangzhou 510640, China; (L.S.); (H.W.); (W.G.); (Y.L.); (C.L.); (J.Z.); (W.L.); (C.Z.); (H.G.); (Y.L.); (H.P.); (C.S.)
| | - Dan Wang
- Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Key Laboratory of Nutrient Cycling and Farmland Conservation of Guangdong Province, Guangzhou 510640, China; (L.S.); (H.W.); (W.G.); (Y.L.); (C.L.); (J.Z.); (W.L.); (C.Z.); (H.G.); (Y.L.); (H.P.); (C.S.)
| | - Guixiang Peng
- College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China;
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Li B, He X, Guo S, Li D, Wang Y, Meng X, Dai P, Hu T, Cao K, Wang S. Characterization of Bacillus amyloliquefaciens BA-4 and its biocontrol potential against Fusarium-related apple replant disease. FRONTIERS IN PLANT SCIENCE 2024; 15:1370440. [PMID: 38708392 PMCID: PMC11067707 DOI: 10.3389/fpls.2024.1370440] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/14/2024] [Accepted: 04/03/2024] [Indexed: 05/07/2024]
Abstract
Apple replant disease (ARD), caused by Fusarium pathogens, is a formidable threat to the renewal of apple varieties in China, necessitating the development of effective and sustainable control strategies. In this study, the bacterial strain BA-4 was isolated from the rhizosphere soil of healthy apple trees in a replanted orchard, demonstrating a broad-spectrum antifungal activity against five crucial apple fungal pathogens. Based on its morphology, physiological and biochemical traits, utilization of carbon sources, and Gram stain, strain BA-4 was tentatively identified as Bacillus amyloliquefaciens. Phylogenetic analysis using 16S rDNA and gyrB genes conclusively identified BA-4 as B. amyloliquefaciens. In-depth investigations into B. amyloliquefaciens BA-4 revealed that the strain possesses the capacity to could secrete cell wall degrading enzymes (protease and cellulase), produce molecules analogous to indole-3-acetic acid (IAA) and siderophores, and solubilize phosphorus and potassium. The diverse attributes observed in B. amyloliquefaciens BA-4 underscore its potential as a versatile microorganism with multifaceted benefits for both plant well-being and soil fertility. The extracellular metabolites produced by BA-4 displayed a robust inhibitory effect on Fusarium hyphal growth and spore germination, inducing irregular swelling, atrophy, and abnormal branching of fungal hyphae. In greenhouse experiments, BA-4 markedly reduced the disease index of Fusarium-related ARD, exhibiting protective and therapeutic efficiencies exceeding 80% and 50%, respectively. Moreover, BA-4 demonstrated plant-promoting abilities on both bean and Malus robusta Rehd. (MR) seedlings, leading to increased plant height and primary root length. Field experiments further validated the biocontrol effectiveness of BA-4, demonstrating its ability to mitigate ARD symptoms in MR seedlings with a notable 33.34% reduction in mortality rate and improved biomass. Additionally, BA-4 demonstrates robust and stable colonization capabilities in apple rhizosphere soil, particularly within the 10-20 cm soil layer, which indicates that it has long-term effectiveness potential in field conditions. Overall, B. amyloliquefaciens BA-4 emerges as a promising biocontrol agent with broad-spectrum antagonistic capabilities, positive effects on plant growth, and strong colonization abilities for the sustainable management of ARD in apple cultivation.
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Affiliation(s)
- Bo Li
- College of Plant Protection, State Key Laboratory of North China Crop Improvement and Regulation, Hebei Agricultural University, Baoding, China
- Institute of Agricultural Information and Economics, Hebei Academy of Agriculture and Forestry Sciences, Shijiazhuang, Hebei, China
| | - Xiaoxing He
- College of Plant Protection, State Key Laboratory of North China Crop Improvement and Regulation, Hebei Agricultural University, Baoding, China
| | - Saiya Guo
- College of Plant Protection, State Key Laboratory of North China Crop Improvement and Regulation, Hebei Agricultural University, Baoding, China
| | - Dongxu Li
- College of Plant Protection, State Key Laboratory of North China Crop Improvement and Regulation, Hebei Agricultural University, Baoding, China
| | - Yanan Wang
- College of Plant Protection, State Key Laboratory of North China Crop Improvement and Regulation, Hebei Agricultural University, Baoding, China
| | - Xianglong Meng
- College of Plant Protection, State Key Laboratory of North China Crop Improvement and Regulation, Hebei Agricultural University, Baoding, China
| | - Pengbo Dai
- College of Plant Protection, State Key Laboratory of North China Crop Improvement and Regulation, Hebei Agricultural University, Baoding, China
| | - Tongle Hu
- College of Plant Protection, State Key Laboratory of North China Crop Improvement and Regulation, Hebei Agricultural University, Baoding, China
| | - Keqiang Cao
- College of Plant Protection, State Key Laboratory of North China Crop Improvement and Regulation, Hebei Agricultural University, Baoding, China
| | - Shutong Wang
- College of Plant Protection, State Key Laboratory of North China Crop Improvement and Regulation, Hebei Agricultural University, Baoding, China
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Gao M, Abdallah MF, Song M, Xu Y, Sun D, Lu P, Wang J. Novel Endophytic Pseudescherichia sp. GSE25 Strain Significantly Controls Fusarium graminearum and Reduces Deoxynivalenol in Wheat. Toxins (Basel) 2023; 15:702. [PMID: 38133206 PMCID: PMC10747052 DOI: 10.3390/toxins15120702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Revised: 12/09/2023] [Accepted: 12/13/2023] [Indexed: 12/23/2023] Open
Abstract
Fusarium heading blight (FHB) is a devastating disease in wheat, primarily caused by field invasion of Fusarium graminearum. Due to the scarcity of resistant wheat varieties, the agricultural sector resorts to chemical fungicides to control FHB incidence. On the other hand, biocontrol represents a promising, eco-friendly approach aligned with sustainable and green agriculture concepts. In the present study, a bacterial endophyte, Pseudescherichia sp. (GSE25), was isolated from wheat seeds and identified through complete genome sequencing and phylogenetic analysis. In vitro testing of this endophytic strain demonstrated strong antifungal activity against F. graminearum PH-1 by inhibiting spore germination, suppressing germ tube growth, and causing cell membrane damage. Under field conditions, the strain GSE25 significantly reduced the FHB incidence and the associated deoxynivalenol mycotoxin accumulation by over 60% and 80%, respectively. These findings highlight the potential of the isolated bacterial endophyte Pseudescherichia sp. GSE25 strain as a biocontrol agent in protecting wheat from FHB-caused F. graminearum. This is the first report showing a biocontrol effect of Pseudescherichia sp. a strain against phytopathogens.
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Affiliation(s)
- Meiling Gao
- National Engineering Research Center of Seafood, School of Food Science and Technology, Dalian Polytechnic University, Dalian 116034, China;
- State Key Laboratory of Crop Stress Resistance and High-Efficiency Production, College of Plant Protection, Northwest A&F University, Xianyang 712100, China; (M.S.)
| | - Mohamed F. Abdallah
- Department of Food Technology, Safety and Health, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Gent, Belgium;
- Department of Forensic Medicine and Toxicology, Faculty of Veterinary Medicine, Assiut University, Assiut 71515, Egypt
| | - Minggui Song
- State Key Laboratory of Crop Stress Resistance and High-Efficiency Production, College of Plant Protection, Northwest A&F University, Xianyang 712100, China; (M.S.)
| | - Yiqian Xu
- State Key Laboratory of Crop Stress Resistance and High-Efficiency Production, College of Plant Protection, Northwest A&F University, Xianyang 712100, China; (M.S.)
| | - Daiyuan Sun
- State Key Laboratory of Crop Stress Resistance and High-Efficiency Production, College of Plant Protection, Northwest A&F University, Xianyang 712100, China; (M.S.)
| | - Ping Lu
- The Key Laboratory for Quality Improvement of Agricultural Products of Zhejiang Province, College of Advanced Agricultural Sciences, Zhejiang A&F University, Hangzhou 311300, China
| | - Jianhua Wang
- Institute for Agri-Food Standards and Testing Technology, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China
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Li Y, Zhang X, He K, Song X, Yu J, Guo Z, Xu M. Isolation and Identification of Bacillus subtilis LY-1 and Its Antifungal and Growth-Promoting Effects. PLANTS (BASEL, SWITZERLAND) 2023; 12:4158. [PMID: 38140485 PMCID: PMC10747398 DOI: 10.3390/plants12244158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Revised: 11/29/2023] [Accepted: 12/11/2023] [Indexed: 12/24/2023]
Abstract
Peanut root rot, caused by Fusarium spp., is a devastating fungal disease. As part of a program to obtain a biocontrol agent to control peanut root rot in the field, a bacterial strain LY-1 capable of inhibiting the growth of the fungus in vitro was isolated from rhizosphere soil samples collected from wild mint by agar disk dilution and dual-culture assay. Strain LY-1 was identified as Bacillus subtilis based on morphological characteristics, 16S rDNA, and gyrA sequence analyses. The bacterial suspension and cell-free culture filtrate of LY-1 could significantly inhibit the growth of Fusarium oxysporum, Fusarium proliferatum and Fusarium solani, but volatile organic compounds from the cultures had only a weak effect on mycelial growth. The percentage inhibition of 20% concentration of the cell-free culture filtrate of LY-1 on conidium production of each of the three Fusarium species was greater than 72.38%, and the percentage inhibition by the culture filtration on the germination of conidia of the three species was at least 62.37%. The production of extracellular enzyme activity by LY-1 was studied in functional assays, showing protease, cellulase, amylase, chitinase, and β-1,3-glucanase activity, while LY-1 contained a gene encoding iturin, an antifungal lipopeptide. In addition, under pot culture in a greenhouse, culture filtrate of LY-1 significantly promoted the growth of peanut, increasing the fresh and dry mass of the plant by 30.77% and 27.27%, respectively, in comparison with the no-filtrate control. The culture filtrate of LY-1 increased the resistance of peanut plants to F. oxysporum, with the biocontrol efficiency reaching 44.71%. In conclusion, B. subtilis LY-1, a plant-growth-promoting rhizobacterium, was able to protect peanuts from Fusarium spp. infection.
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Affiliation(s)
- Ying Li
- Shandong Peanut Research Institute, Qingdao 266100, China; (Y.L.); (X.Z.); (K.H.); (X.S.); (J.Y.); (Z.G.)
- National Engineering Research Center for Peanut, Qingdao 266100, China
| | - Xia Zhang
- Shandong Peanut Research Institute, Qingdao 266100, China; (Y.L.); (X.Z.); (K.H.); (X.S.); (J.Y.); (Z.G.)
- National Engineering Research Center for Peanut, Qingdao 266100, China
| | - Kang He
- Shandong Peanut Research Institute, Qingdao 266100, China; (Y.L.); (X.Z.); (K.H.); (X.S.); (J.Y.); (Z.G.)
- National Engineering Research Center for Peanut, Qingdao 266100, China
| | - Xinying Song
- Shandong Peanut Research Institute, Qingdao 266100, China; (Y.L.); (X.Z.); (K.H.); (X.S.); (J.Y.); (Z.G.)
- National Engineering Research Center for Peanut, Qingdao 266100, China
| | - Jing Yu
- Shandong Peanut Research Institute, Qingdao 266100, China; (Y.L.); (X.Z.); (K.H.); (X.S.); (J.Y.); (Z.G.)
- National Engineering Research Center for Peanut, Qingdao 266100, China
| | - Zhiqing Guo
- Shandong Peanut Research Institute, Qingdao 266100, China; (Y.L.); (X.Z.); (K.H.); (X.S.); (J.Y.); (Z.G.)
- National Engineering Research Center for Peanut, Qingdao 266100, China
| | - Manlin Xu
- Shandong Peanut Research Institute, Qingdao 266100, China; (Y.L.); (X.Z.); (K.H.); (X.S.); (J.Y.); (Z.G.)
- National Engineering Research Center for Peanut, Qingdao 266100, China
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Zou L, Wang Q, Wu R, Zhang Y, Wu Q, Li M, Ye K, Dai W, Huang J. Biocontrol and plant growth promotion potential of endophytic Bacillus subtilis JY-7-2L on Aconitum carmichaelii Debx. Front Microbiol 2023; 13:1059549. [PMID: 36704569 PMCID: PMC9871935 DOI: 10.3389/fmicb.2022.1059549] [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: 10/01/2022] [Accepted: 12/16/2022] [Indexed: 01/12/2023] Open
Abstract
Aconitum carmichaelii Debx. is a famous medicinal plant rich in alkaloids and widely used to treat various human diseases in Asian countries. However, southern blight caused by Sclerotium rolfsii severely hampered the yield of A. carmichaelii. Beneficial microbe-based biological control is becoming a promising alternative and an environmentally friendly approach for the management of plant diseases. In this study, we evaluated the biocontrol potential of an endophytic bacterial strain JY-7-2L, which was isolated from the leaves of A. carmichaelii, against southern blight in vitro and by a series of field experiments. JY-7-2L was identified as Bacillus subtilis based on multi-locus sequence analysis. JY-7-2L showed strong antagonistic activity against S. rolfsii in vitro and on A. carmichaelii root slices by dual-culture assay. Cell-free culture filtrate of JY-7-2L significantly inhibited the hyphal growth, sclerotia formation, and germination of S. rolfsii. In addition, volatile compounds produced by JY-7-2L completely and directly inhibited the growth of S. rolfsii. Furthermore, JY-7-2L was proved to produce hydrolytic enzymes including glucanase, cellulase, protease, indole acetic acid, and siderophore. The presence of bacA, fenA, fenB, fenD, srfAA, and baeA genes by PCR amplification indicated that JY-7-2L was able to produce antifungal lipopeptides and polyketides. Field trials indicated that application of the JY-7-2L fermentation culture significantly reduced southern blight disease severity by up to 30% with a long-acting duration of up to 62 days. Meanwhile, JY-7-2L significantly promoted the fresh and dry weights of the stem, main root, and lateral roots of A. carmichaelii compared to non-inoculation and/or commercial B. subtilis product treatments. Taken together, JY-7-2L can be used as a promising biocontrol agent for the control of southern blight in A. carmichaelii.
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Affiliation(s)
- Lan Zou
- School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, China
| | - Qian Wang
- School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, China
| | - Rongxing Wu
- School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, China
| | - Yaopeng Zhang
- School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, China
| | - Qingshan Wu
- School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, China
| | - Muyi Li
- School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, China
| | - Kunhao Ye
- Mianyang Academy of Agricultural Science, Mianyang, China
| | - Wei Dai
- Mianyang Academy of Agricultural Science, Mianyang, China
| | - Jing Huang
- School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, China,*Correspondence: Jing Huang,
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