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Zou P, Ma S, Yuan Y, Ma J, Yang X, Hu X, Meng Q, Jing C, Li Y. A glucomannan produced by Bacillus velezensis HY23 and its growth promoting effect on soybeans under salt stress. Int J Biol Macromol 2024; 275:133474. [PMID: 38945338 DOI: 10.1016/j.ijbiomac.2024.133474] [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: 04/13/2024] [Revised: 06/12/2024] [Accepted: 06/25/2024] [Indexed: 07/02/2024]
Abstract
The Bacillus genus is widely distributed in nature, has bacteriostatic and growth-promoting activities, and has broad application potential in agriculture. An exopolysaccharide (EPS) was extracted and purified from Bacillus velezensis HY23. Structural characterisation of the EPS was performed by chemical and spectroscopic analyses. Methylation analysis showed that the EPS of HY23 was composed of mannose and glucose at a ratio of 82:18 and was identified as glucomannan. Combined with the nuclear magnetic resonance (NMR) analysis, EPS from HY23 had a backbone of →2)-α-D-Manp-(1 → and →2,6)-α-D-Manp-(1 → branched at C-6 with terminal α-(3-O-Me)-D-Manp-(1 → and →6)-α-D-Manp-(1 → residues as the side chain. A certain amount of β-D-Glcp residues were also present in backbone. Moreover, EPS significantly improved the nitrogen-fixing activity and salt resistance of soybean seedlings by regulating the antioxidant pool and expression of ion transporters. These findings indicate that EPS from B. velezensis HY23 is a potential biostimulant for enhancing plant resistance to salt stress.
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Affiliation(s)
- Ping Zou
- Marine Agriculture Research Center, Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao 266101, China; National Center of Technology Innovation for Comprehensive Utilization of Saline-Alkali Land, Dongying 257300, China; Qingdao Key Laboratory of Coastal Saline-alkali Land Resources Mining and Biological Breeding, Qingdao 266101, China
| | - Siqi Ma
- Marine Agriculture Research Center, Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao 266101, China; National Center of Technology Innovation for Comprehensive Utilization of Saline-Alkali Land, Dongying 257300, China; Qingdao Key Laboratory of Coastal Saline-alkali Land Resources Mining and Biological Breeding, Qingdao 266101, China
| | - Yuan Yuan
- Marine Agriculture Research Center, Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao 266101, China; National Center of Technology Innovation for Comprehensive Utilization of Saline-Alkali Land, Dongying 257300, China; Qingdao Key Laboratory of Coastal Saline-alkali Land Resources Mining and Biological Breeding, Qingdao 266101, China
| | - Junqing Ma
- Marine Agriculture Research Center, Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao 266101, China; National Center of Technology Innovation for Comprehensive Utilization of Saline-Alkali Land, Dongying 257300, China; Qingdao Key Laboratory of Coastal Saline-alkali Land Resources Mining and Biological Breeding, Qingdao 266101, China
| | - Xia Yang
- Marine Agriculture Research Center, Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao 266101, China; National Center of Technology Innovation for Comprehensive Utilization of Saline-Alkali Land, Dongying 257300, China; Qingdao Key Laboratory of Coastal Saline-alkali Land Resources Mining and Biological Breeding, Qingdao 266101, China
| | - Xihao Hu
- Shandong Qingdao Tobacco Co., Ltd., Qingdao 266000, China
| | - Qi Meng
- Qingdao Agricultural University, Qingdao 266000, China
| | - Changliang Jing
- Marine Agriculture Research Center, Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao 266101, China; National Center of Technology Innovation for Comprehensive Utilization of Saline-Alkali Land, Dongying 257300, China; Qingdao Key Laboratory of Coastal Saline-alkali Land Resources Mining and Biological Breeding, Qingdao 266101, China.
| | - Yiqiang Li
- Marine Agriculture Research Center, Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao 266101, China; National Center of Technology Innovation for Comprehensive Utilization of Saline-Alkali Land, Dongying 257300, China; Qingdao Key Laboratory of Coastal Saline-alkali Land Resources Mining and Biological Breeding, Qingdao 266101, China.
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Yang R, Liu P, Ye W, Chen Y, Wei D, Qiao C, Zhou B, Xiao J. Biological Control of Root Rot of Strawberry by Bacillus amyloliquefaciens Strains CMS5 and CMR12. J Fungi (Basel) 2024; 10:410. [PMID: 38921396 PMCID: PMC11204515 DOI: 10.3390/jof10060410] [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: 05/04/2024] [Revised: 06/02/2024] [Accepted: 06/04/2024] [Indexed: 06/27/2024] Open
Abstract
Strawberry root rot caused by Fusarium solani is one of the main diseases of strawberries and significantly impacts the yield and quality of strawberry fruit. Biological control is becoming an alternative method for the control of plant diseases to replace or decrease the application of traditional chemical fungicides. To obtain antagonistic bacteria with a high biocontrol effect on strawberry root rot, over 72 rhizosphere bacteria were isolated from the strawberry rhizosphere soil and screened for their antifungal activity against F. solani by dual culture assay. Among them, strains CMS5 and CMR12 showed the strongest inhibitory activity against F. solani (inhibition rate 57.78% and 65.93%, respectively) and exhibited broad-spectrum antifungal activity. According to the phylogenetic tree based on 16S rDNA and gyrB genes, CMS5 and CMR12 were identified as Bacillus amyloliquefaciens. Lipopeptide genes involved in surfactin, iturin, and fengycin biosynthesis were detected in the DNA genomes of CMS5 and CMR12 by PCR amplification. The genes related to the three major lipopeptide metabolites existed in the DNA genome of strains CMS5 and CMR12, and the lipopeptides could inhibit the mycelial growth of F. solani and resulted in distorted hyphae. The inhibitory rates of lipopeptides of CMS5 and CMR12 on the spore germination of F. solani were 61.00% and 42.67%, respectively. The plant-growth-promoting (PGP) traits in vitro screening showed that CMS5 and CMR12 have the ability to fix nitrogen and secreted indoleacetic acid (IAA). In the potting test, the control efficiency of CMS5, CMR12 and CMS5+CMR12 against strawberry root rot were 65.3%, 67.94% and 88.00%, respectively. Furthermore, CMS5 and CMR12 enhanced the resistance of strawberry to F. solani by increasing the activities of defense enzymes MDA, CAT and SOD. Moreover, CMS5 and CMR12 significantly promoted the growth of strawberry seedlings such as root length, seedling length and seedling fresh weight. This study revealed that B. amyloliquefaciens CMS5 and CMR12 have high potential to be used as biocontrol agents to control strawberry root rot.
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Affiliation(s)
- Ruixian Yang
- School of Environmental Engineering and Chemistry, Luoyang Institute of Science and Technology, Luoyang 471002, China; (P.L.); (Y.C.); (D.W.); (C.Q.); (B.Z.); (J.X.)
| | - Ping Liu
- School of Environmental Engineering and Chemistry, Luoyang Institute of Science and Technology, Luoyang 471002, China; (P.L.); (Y.C.); (D.W.); (C.Q.); (B.Z.); (J.X.)
| | - Wenyu Ye
- China National Engineering Research Center of JUNCAO Technology, College of JunCao Science and Ecology (College of Carbon Neutrality), Fujian Agriculture & Forestry University, Fuzhou 350002, China
- Technology Innovation Center for Monitoring and Restoration Engineering of Ecological Fragile Zone in Southeast China, Ministry of Natural Resources, Fuzhou 350002, China
| | - Yuquan Chen
- School of Environmental Engineering and Chemistry, Luoyang Institute of Science and Technology, Luoyang 471002, China; (P.L.); (Y.C.); (D.W.); (C.Q.); (B.Z.); (J.X.)
| | - Daowei Wei
- School of Environmental Engineering and Chemistry, Luoyang Institute of Science and Technology, Luoyang 471002, China; (P.L.); (Y.C.); (D.W.); (C.Q.); (B.Z.); (J.X.)
| | - Cuicui Qiao
- School of Environmental Engineering and Chemistry, Luoyang Institute of Science and Technology, Luoyang 471002, China; (P.L.); (Y.C.); (D.W.); (C.Q.); (B.Z.); (J.X.)
| | - Bingyi Zhou
- School of Environmental Engineering and Chemistry, Luoyang Institute of Science and Technology, Luoyang 471002, China; (P.L.); (Y.C.); (D.W.); (C.Q.); (B.Z.); (J.X.)
| | - Jingyao Xiao
- School of Environmental Engineering and Chemistry, Luoyang Institute of Science and Technology, Luoyang 471002, China; (P.L.); (Y.C.); (D.W.); (C.Q.); (B.Z.); (J.X.)
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Li X, Cheng X, Wu J, Cai Z, Wang Z, Zhou J. Multi-omics reveals different impact patterns of conventional and biodegradable microplastics on the crop rhizosphere in a biofertilizer environment. JOURNAL OF HAZARDOUS MATERIALS 2024; 467:133709. [PMID: 38330650 DOI: 10.1016/j.jhazmat.2024.133709] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2023] [Revised: 01/28/2024] [Accepted: 02/01/2024] [Indexed: 02/10/2024]
Abstract
Microplastics (MPs) from the incomplete degradation of agricultural mulch can stress the effectiveness of biofertilizers and ultimately affect the rhizosphere environment of crops. Yet, the involved mechanisms are poorly known and robust empirical data is generally lacking. Here, conventional polyethylene (PE) MPs and poly(butylene adipate-co-butylene terephthalate) (PBAT) / poly(lactic acid) (PLA) biodegradable MPs (PBAT-PLA BioMPs) were investigated to assess their potential impact on the rhizosphere environment of Brassica parachinensis in the presence of Bacillus amyloliquefaciens biofertilizer. The results revealed that both MPs caused different levels of inhibited crop both above- and belowground crop biomass (up to 50.11% and 57.09%, respectively), as well as a significant decrease in plant height (up to 48.63% and 25.95%, respectively), along with an imbalance of microbial communities. Transcriptomic analyses showed that PE MPs mainly affected root's vitamin metabolism, whereas PBAT-PLA BioMPs mainly interfered with the lipid's enrichment. Metabolomic analyses further indicated that PE MPs interfered with amino acid synthesis that involved in crops' oxidative stress, and that PBAT-PLA BioMPs mainly affected the pathways associated with root growth. Additionally, PBAT-PLA BioMPs had a bigger ecological negative impact than did PE MPs, as evidenced by more pronounced alterations in root antioxidant abilities, a higher count of identified differential metabolites, more robust interrelationships among rhizosphere parameters, and a more intricate pattern of impacts on rhizosphere metrics. This study highlights the MPs' impact on crop rhizosphere in a biofertilizer environment from a rhizosphere multi-omics perspective, and has theoretical implications for scientific application of biofertilizers.
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Affiliation(s)
- Xinyang Li
- Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, PR China
| | - Xueyu Cheng
- Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, PR China
| | - Jialing Wu
- Ecological Fertilizer Research Institute, Shenzhen Batian Ecological Engineering Co., Ltd., Shenzhen, PR China
| | - Zhonghua Cai
- Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, PR China
| | - Zongkang Wang
- Ecological Fertilizer Research Institute, Shenzhen Batian Ecological Engineering Co., Ltd., Shenzhen, PR China
| | - Jin Zhou
- Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, PR China.
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Qi HY, Wang D, Han D, Song J, Ali M, Dai XF, Zhang XJ, Chen JY. Unlocking antagonistic potential of Bacillus amyloliquefaciens KRS005 to control gray mold. Front Microbiol 2023; 14:1189354. [PMID: 37333651 PMCID: PMC10272387 DOI: 10.3389/fmicb.2023.1189354] [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: 03/19/2023] [Accepted: 05/15/2023] [Indexed: 06/20/2023] Open
Abstract
To establish a safe, efficient, and simple biocontrol measure for gray mold disease caused by Botrytis cinerea, the basic characteristics and antifungal activity of KRS005 were studied from multiple aspects including morphological observation, multilocus sequence analysis and typing (MLSA-MLST), physical-biochemical assays, broad-spectrum inhibitory activities, control efficiency of gray mold, and determination of plant immunity. The strain KRS005, identified as Bacillus amyloliquefaciens, demonstrated broad-spectrum inhibitory activities against various pathogenic fungi by dual confrontation culture assays, of which the inhibition rate of B. cinerea was up to 90.3%. Notably, through the evaluation of control efficiency, it was found that KRS005 fermentation broth could effectively control the occurrence of tobacco leaves gray mold by determining the lesion diameter and biomass of B. cinerea on tobacco leaves still had a high control effect after dilution of 100 folds. Meanwhile, KRS005 fermentation broth had no impact on the mesophyll tissue of tobacco leaves. Further studies showed that plant defense-related genes involved in reactive oxygen species (ROS), salicylic acid (SA), and jasmonic acid (JA)-related signal pathways were significantly upregulated when tobacco leaves were sprayed with KRS005 cell-free supernatant. In addition, KRS005 could inhibit cell membrane damage and increase the permeability of B. cinerea. Overall, KRS005, as a promising biocontrol agent, would likely serve as an alternative to chemical fungicides to control gray mold.
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Affiliation(s)
- Hong-Yue Qi
- College of Life Science and Technology, Mudanjiang Normal University, Mudanjiang, China
- The State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Dan Wang
- The State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Dongfei Han
- School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou, China
| | - Jian Song
- The State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Muhammad Ali
- Sustainable Development Study Centre, Government College University, Lahore, Pakistan
| | - Xiao-Feng Dai
- The State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
- Western Agricultural Research Center, Chinese Academy of Agricultural Sciences, Changji, China
| | - Xiao-Jun Zhang
- College of Life Science and Technology, Mudanjiang Normal University, Mudanjiang, China
| | - Jie-Yin Chen
- The State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
- Western Agricultural Research Center, Chinese Academy of Agricultural Sciences, Changji, China
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Soliman SA, Abdelhameed RE, Metwally RA. In vivo and In vitro evaluation of the antifungal activity of the PGPR Bacillus amyloliquefaciens RaSh1 (MZ945930) against Alternaria alternata with growth promotion influences on Capsicum annuum L. plants. Microb Cell Fact 2023; 22:70. [PMID: 37055827 PMCID: PMC10103514 DOI: 10.1186/s12934-023-02080-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2023] [Accepted: 04/04/2023] [Indexed: 04/15/2023] Open
Abstract
Alternaria alternata that threatens pepper production and causes major economic harm is responsible for the leaf spot/blight disease. Chemical fungicides have been widely employed; unfortunately, fungicidal resistance is a current concern. Therefore, finding new environmentally friendly biocontrol agents is a future challenge. One of these friendly solutions is the use of bacterial endophytes that have been identified as a source of bioactive compounds. The current study investigates the in vivo and in vitro fungicidal potential of Bacillus amyloliquefaciens RaSh1 (MZ945930) against pathogenic A. alternata. In vitro, the results revealed that RaSh1 exhibited strong antagonistic activity against A. alternata. In addition to this, we inoculated pepper (Capsicum annuum L.) plants with B. amyloliquefaciens RaSh1 and infected them with A. alternata. As a result of A. alternata infection, which generated the highest leaf spot disease incidence (DI), the plant's growth indices and physio-biochemical characteristics significantly decreased, according to our findings. Our results also showed the abnormal and deformed cell structure using light and electron microscopy of A. alternata-infected leaves compared with other treatments. However, DI was greatly reduced with B. amyloliquefaciens RaSh1 application (40%) compared to pepper plants infected with A. alternata (80%), and this led to the largest increases in all identified physio-biochemical parameters, including the activity of the defense-related enzymes. Moreover, inoculation of pepper plants with B. amyloliquefaciens RaSh1 decreased electrolyte leakage by 19.53% and MDA content by 38.60% as compared to A. alternata infected ones. Our results show that the endophyte B. amyloliquefaciens RaSh1 has excellent potential as a biocontrol agent and positively affects pepper plant growth.
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Affiliation(s)
- Shereen A Soliman
- Botany and Microbiology Department, Faculty of Science, Zagazig University, Zagazig, 44519, Egypt
| | - Reda E Abdelhameed
- Botany and Microbiology Department, Faculty of Science, Zagazig University, Zagazig, 44519, Egypt
| | - Rabab A Metwally
- Botany and Microbiology Department, Faculty of Science, Zagazig University, Zagazig, 44519, Egypt.
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Suppression of Fusarium Wilt in Watermelon by Bacillus amyloliquefaciens DHA55 through Extracellular Production of Antifungal Lipopeptides. J Fungi (Basel) 2023; 9:jof9030336. [PMID: 36983504 PMCID: PMC10053319 DOI: 10.3390/jof9030336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2023] [Revised: 03/06/2023] [Accepted: 03/07/2023] [Indexed: 03/12/2023] Open
Abstract
Fusarium wilt caused by Fusarium oxysporum f. sp. niveum is one of the most devastating fungal diseases affecting watermelon (Citrullus lanatus L.). The present study aimed to identify potent antagonistic bacterial strains with substantial antifungal activity against F. oxysporum f. sp. niveum and to explore their potential for biocontrol of Fusarium wilt in watermelon. Out of 77 isolates from watermelon rhizosphere, six bacterial strains—namely, DHA4, DHA6, DHA10, DHA12, DHA41, and DHA55—exhibited significant antifungal activity against F. oxysporum f. sp. niveum, as well as other phytopathogenic fungi, including Didymella bryoniae, Sclerotinia sclerotiorum, Fusarium graminearum, and Rhizoctonia solani. These Gram-positive, rod-shaped, antagonistic bacterial strains were able to produce exo-enzymes (e.g., catalase, protease, and cellulase), siderophore, and indole-3-acetic acid and had the ability to solubilize phosphate. In greenhouse experiments, these antagonistic bacterial strains not only promoted plant growth but also suppressed Fusarium wilt in watermelon. Among these strains, DHA55 was the most effective, achieving the highest disease suppression of 74.9%. Strain DHA55 was identified as Bacillus amyloliquefaciens based on physiological, biochemical, and molecular characterization. B. amyloliquefaciens DHA55 produced various antifungal lipopeptides, including iturin, surfactin, and fengycin, that showed significant antifungal activities against F. oxysporum f. sp. niveum. Microscopic observations revealed that B. amyloliquefaciens DHA55 exhibited an inhibitory effect against F. oxysporum f. sp. niveum on the root surface of watermelon plants. These results demonstrate that B. amyloliquefaciens DHA55 can effectively promote plant growth and suppress the development of watermelon Fusarium wilt, providing a promising agent for the biocontrol of Fusarium wilt in watermelon.
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Yadav M, Divyanshu K, Dubey MK, Rai A, Kumar S, Tripathi YN, Shukla V, Upadhyay RS. Plant growth promotion and differential expression of defense genes in chilli pepper against Colletotrichum truncatum induced by Trichoderma asperellum and T. harzianum. BMC Microbiol 2023; 23:54. [PMID: 36864373 PMCID: PMC9983198 DOI: 10.1186/s12866-023-02789-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2022] [Accepted: 02/08/2023] [Indexed: 03/04/2023] Open
Abstract
BACKGROUND Trichoderma asperellum and T. harzianum were assessed in this study as a potential biological control against Colletotrichum truncatum. C. truncatum is a hemibiotrophic fungus that causes anthracnose disease in chilli thereby affecting plant growth and fruit yield. Scanning electron microscope (SEM) technique showed the beneficial interaction between chilli root-Trichoderma spp. inducing the plant growth promotion, mechanical barrier, and defense network under C. truncatum challenged conditions. METHODS Seeds bio-primed with T. asperellum, T. harzianum, and T. asperellum + T. harzianum promoted the plant growth parameters and strengthening of physical barrier via lignification on the wall of vascular tissues. Seed primed with bioagents were used for exploring the molecular mechanism of defense response in pepper against anthracnose to assess the temporal expression of six defense genes in the Surajmukhi variety of Capsicum annuum. QRT-PCR demonstrated induction of defense responsive genes in chilli pepper bioprimed with Trichoderma spp. such as plant defensin 1.2 (CaPDF1.2), superoxide dismutase (SOD), ascorbate peroxidase (APx), guaiacol peroxidase (GPx), pathogenesis related proteins PR-2 and PR-5. RESULTS The results showed that bioprimed seeds were assessed for T. asperellum, T. harzianum, and T. asperellum + T. harzianum-chilli root colonization interaction under in vivo conditions. The results of the scanning electron microscope revealed that T. asperellum, T. harzianum and T. asperellum + T. harzianum interact with chilli roots directly via the development of plant-Trichoderma interaction system. Seeds bio-primed with bioagents promoted the plant growth parameters, fresh and dry weight of shoot and root, plant height, leaf area index, number of leaves, stem diameter and strengthening of physical barrier via lignification on the wall of vascular tissues and expression of six defense related genes in pepper against anthracnose. CONCLUSIONS Application of T. asperellum and T. harzianum and in combination of treatments enhanced the plant growth. Further, as seeds bioprimed with T. asperellum, T. harzianum and in combination with treatment of T. asperellum + T. harzianum induced the strengthening of the cell wall by lignification and expression of six defense related genes CaPDF1.2, SOD, APx, GPx, PR-2 and PR-5 in pepper against C. truncatum. Our study contributed for better disease management through biopriming with T. asperellum, T. harzianum and T. asperellum + T. harzianum. The biopriming possess enormous potential to promote plant growth, modulate the physical barrier, and induced the defense related genes in chilli pepper against anthracnose.
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Affiliation(s)
- Mukesh Yadav
- Laboratory of Mycopathology and Microbial Technology, Centre of Advanced Study in Botany, Institute of Science, Banaras Hindu University, Varanasi, 221005, Uttar Pradesh, India. .,Kutir Post Graduate College Chakkey, Jaunpur, 222146, Uttar Pradesh, India.
| | - Kumari Divyanshu
- Laboratory of Mycopathology and Microbial Technology, Centre of Advanced Study in Botany, Institute of Science, Banaras Hindu University, Varanasi, 221005, Uttar Pradesh, India
| | - Manish Kumar Dubey
- Department of Biosciences, School of Basic & Applied Sciences, Galgotias University, Greater Noida, 203201, Uttar Pradesh, India
| | - Ashutosh Rai
- Department of Biochemistry, College of Horticulture, Banda University of Agriculture and Technology, Banda, 210001, Uttar Pradesh, India
| | - Sunil Kumar
- Laboratory of Mycopathology and Microbial Technology, Centre of Advanced Study in Botany, Institute of Science, Banaras Hindu University, Varanasi, 221005, Uttar Pradesh, India
| | - Yashoda Nandan Tripathi
- Laboratory of Mycopathology and Microbial Technology, Centre of Advanced Study in Botany, Institute of Science, Banaras Hindu University, Varanasi, 221005, Uttar Pradesh, India
| | - Vaishali Shukla
- Laboratory of Mycopathology and Microbial Technology, Centre of Advanced Study in Botany, Institute of Science, Banaras Hindu University, Varanasi, 221005, Uttar Pradesh, India.,Government Post Graduate College, Obra, Sonbhadra, Uttar Pradesh, 231219, India
| | - Ram Sanmukh Upadhyay
- Laboratory of Mycopathology and Microbial Technology, Centre of Advanced Study in Botany, Institute of Science, Banaras Hindu University, Varanasi, 221005, Uttar Pradesh, India
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Zhou X, Wang J, Liu F, Liang J, Zhao P, Tsui CKM, Cai L. Cross-kingdom synthetic microbiota supports tomato suppression of Fusarium wilt disease. Nat Commun 2022; 13:7890. [PMID: 36550095 PMCID: PMC9780251 DOI: 10.1038/s41467-022-35452-6] [Citation(s) in RCA: 36] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Accepted: 12/02/2022] [Indexed: 12/24/2022] Open
Abstract
The role of rhizosphere microbiota in the resistance of tomato plant against soil-borne Fusarium wilt disease (FWD) remains unclear. Here, we showed that the FWD incidence was significantly negatively correlated with the diversity of both rhizosphere bacterial and fungal communities. Using the microbiological culturomic approach, we selected 205 unique strains to construct different synthetic communities (SynComs), which were inoculated into germ-free tomato seedlings, and their roles in suppressing FWD were monitored using omics approach. Cross-kingdom (fungi and bacteria) SynComs were most effective in suppressing FWD than those of Fungal or Bacterial SynComs alone. This effect was underpinned by a combination of molecular mechanisms related to plant immunity and microbial interactions contributed by the bacterial and fungal communities. This study provides new insight into the dynamics of microbiota in pathogen suppression and host immunity interactions. Also, the formulation and manipulation of SynComs for functional complementation constitute a beneficial strategy in controlling soil-borne disease.
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Affiliation(s)
- Xin Zhou
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, P. R. China
- University of Chinese Academy of Sciences, 100101, Beijing, P. R. China
| | - Jinting Wang
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, P. R. China
- University of Chinese Academy of Sciences, 100101, Beijing, P. R. China
| | - Fang Liu
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, P. R. China
| | - Junmin Liang
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, P. R. China
| | - Peng Zhao
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, P. R. China
| | - Clement K M Tsui
- Faculty of Medicine, University of British Columbia, Vancouver, Canada
- National Centre for Infectious Diseases, Tan Tock Seng Hospital, Singapore, Singapore
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore
- Department of Pathology, Sidra Medicine, Doha, Qatar
| | - Lei Cai
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, P. R. China.
- University of Chinese Academy of Sciences, 100101, Beijing, P. R. China.
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9
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Soliman SA, Khaleil MM, Metwally RA. Evaluation of the Antifungal Activity of Bacillusamyloliquefaciens and B. velezensis and Characterization of the Bioactive Secondary Metabolites Produced against Plant Pathogenic Fungi. BIOLOGY 2022; 11:biology11101390. [PMID: 36290294 PMCID: PMC9599029 DOI: 10.3390/biology11101390] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Revised: 09/17/2022] [Accepted: 09/20/2022] [Indexed: 04/21/2023]
Abstract
Endophytic bacteria are plant-beneficial bacteria with a broad host range. They provide numerous benefits to their hosts, helping them tolerate several biotic and abiotic stresses. An interest has recently been developed in endophytic bacteria which are producing bioactive compounds that contribute to the biological control of various phytopathogens. This research paper aimed to investigate the potentiality of new local strains of endophytic bacteria such as Bacillus amyloliquefaciens and B. velezensis and the production of several antimicrobial metabolites associated with the biocontrol of Alternaria sp., which cause serious diseases and affect important vegetable crops in Egypt. Twenty-five endophytic bacteria isolates were obtained from different plants cultivated in El-Sharkia Governorate, Egypt. Dual culture technique was used to evaluate the bacterial isolates' antagonistic potentiality against Alternaria sp. and Helminthosporium sp. The most active bacterial isolates obtained were selected for further screening. The antifungal activity of the most active endophytic bacterial isolate was assessed in vivo on pepper seedlings as a biocontrol agent against Alternaria sp. A significant antifungal activity was recorded with isolates C1 and T5 against Alternaria sp. and Helminthosporium sp. The bacterial endophyte discs of C1 and T5 showed the highest inhibitory effect against Alternaria sp. at 4.7 and 3.1 cm, respectively, and Helminthosporium sp. at 3.9 and 4.0 cm, respectively. The most active endophytic isolates C1 and T5 were identified and the 16S rRNA sequence was submitted to the NCBI GenBank database with accession numbers: MZ945930 and MZ945929 for Bacillus amyloliquefaciens and Bacillus velezensis, respectively. The deformity of pathogenic fungal mycelia of Alternaria sp. and Helminthosporium sp. was studied under the biotic stress of bacteria. The culture filtrates of B. amyloliquefaciens and B. velezensis were extracted with different solvents, and the results indicated that hexane was the most efficient. Gas Chromatography-Mass Spectrometry revealed that Bis (2-ethylhexyl) phthalate, Bis (2-ethylhexyl) ester, and N,N-Dimethyldodecylamine were major constituents of the endophytic crude extracts obtained from B. amyloliquefaciens and B. velezensis. The in vivo results showed that Alternaria sp. infection caused the highest disease incidence, leading to a high reduction in plant height and in the fresh and dry weights of pepper plants. With B. amyloliquefaciens application, DI significantly diminished compared to Alternaria sp. infected pepper plants, resulting in an increase in their morphological parameters. Our findings allow for a reduction of chemical pesticide use and the control of some important plant diseases.
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Affiliation(s)
- Shereen A. Soliman
- Botany and Microbiology Department, Faculty of Science, Zagazig University, Zagazig 44519, Egypt
| | - Mona M. Khaleil
- Botany and Microbiology Department, Faculty of Science, Zagazig University, Zagazig 44519, Egypt
- Biology Department, Faculty of Science, Taibah University, Yanbu El-Bahr 46429, Saudi Arabia
| | - Rabab A. Metwally
- Botany and Microbiology Department, Faculty of Science, Zagazig University, Zagazig 44519, Egypt
- Correspondence: ; Tel.: +20-101-625-9372; Fax: +20-055-320-8213
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Bacillus amyloliquefaciens as an excellent agent for biofertilizer and biocontrol in agriculture: an overview for its mechanisms. Microbiol Res 2022; 259:127016. [DOI: 10.1016/j.micres.2022.127016] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Revised: 03/20/2022] [Accepted: 03/21/2022] [Indexed: 11/18/2022]
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