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Ma J, Li Y, Zhou H, Qi L, Zhang Z, Zheng Y, Yu Z, Muhammad Z, Yang X, Xie Y, Chen Q, Zou P, Ma S, Li Y, Jing C. Chitooligosaccharides and Arbuscular Mycorrhizal fungi alleviate the damage by Phytophthora nicotianae to tobacco seedlings by inducing changes in rhizosphere microecology. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2024; 215:108986. [PMID: 39106769 DOI: 10.1016/j.plaphy.2024.108986] [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: 04/15/2024] [Revised: 07/26/2024] [Accepted: 07/28/2024] [Indexed: 08/09/2024]
Abstract
Arbuscular mycorrhizal fungi (AMF) and Chitooligosaccharide (COS) can increase the resistance of plants to disease. COS can also promote the symbiosis between AMF and plants. However, the effects of AMF & COS combined application on the rhizosphere soil microbial community of tobacco and the improvement of tobacco's resistance to black shank disease are poorly understood.·We treated tobacco with AMF, COS, and combined application of AMF & COS (AC), respectively. Then studied the incidence, physio-biochemical changes, root exudates, and soil microbial diversity of tobacco seedling that was inoculated with Phytophthora nicotianae. The antioxidant enzyme activity and root vigor of tobacco showed a regular of AC > AMF > COS > CK, while the severity of tobacco disease showed the opposite regular. AMF and COS enhance the resistance to black shank disease by enhancing root vigor, and antioxidant capacity, and inducing changes in the rhizosphere microecology of tobacco. We have identified key root exudates and critical soil microorganisms that can inhibit the growth of P. nicotianae. The presence of caprylic acid in root exudates and Bacillus (WdhR-2) in rhizosphere soil microorganisms is the key factor that inhibits P. nicotianae growth. AC can significantly increase the content of caprylic acid in tobacco root exudates compared to AMF and COS. Both AMF and COS can significantly increase the abundance of Bacillus in tobacco rhizosphere soil, but the abundance of Bacillus in AC is significantly higher than that in AMF and COS. This indicates that the combined application of AMF and COS is more effective than their individual use. These findings suggest that exogenous stimuli can induce changes in plant root exudates, regulate plant rhizosphere microbial community, and then inhibit the growth of pathogens, thereby improving plant resistance to diseases.
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Affiliation(s)
- Junqing Ma
- Marine Agriculture Research Center, Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao, 266101, China
| | - Yang Li
- Marine Agriculture Research Center, Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao, 266101, China
| | - Heng Zhou
- Yunnan Kunming Tobacco Co., Ltd, Kunming, 650400, China
| | - Lixin Qi
- Weifang Inspection and Testing Center, Weifang, 261399, China
| | - Zhifan Zhang
- Zunyi Branch, Guizhou Tobacco Company, Zunyi, 563000, China
| | - Yanfen Zheng
- Marine Agriculture Research Center, Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao, 266101, China
| | - Zheyan Yu
- College of Agronomy, Qingdao Agricultural University, Qingdao, 266109, China
| | - Zeeshan Muhammad
- National Key Laboratory of Green Pesticide, South China Agricultural University, Guangzhou, 510642, China
| | - Xia Yang
- Marine Agriculture Research Center, Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao, 266101, China
| | - Yi Xie
- Marine Agriculture Research Center, Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao, 266101, China
| | - Qianru Chen
- Marine Agriculture Research Center, Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao, 266101, China
| | - Ping Zou
- Marine Agriculture Research Center, Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao, 266101, China
| | - Siqi Ma
- Marine Agriculture Research Center, Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao, 266101, China
| | - Yiqiang Li
- Marine Agriculture Research Center, Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao, 266101, China.
| | - Changliang Jing
- Marine Agriculture Research Center, Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao, 266101, China.
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An B, Du D, Huang Z, Pu Z, Lv J, Zhu L, Liu S, Zhang L, Chen G, Lu L. Biocontrol of citrus fungal pathogens by lipopeptides produced by Bacillus velezensis TZ01. Front Microbiol 2024; 15:1471305. [PMID: 39296284 PMCID: PMC11408202 DOI: 10.3389/fmicb.2024.1471305] [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: 07/30/2024] [Accepted: 08/22/2024] [Indexed: 09/21/2024] Open
Abstract
Citrus diseases caused by fungal pathogens drastically decreased the yield and quality of citrus fruits, leading to huge economic losses. Given the threats of chemical pesticides on the environment and human health, biocontrol agents have received considerable attention worldwide as ecofriendly and sustainable alternative to chemical fungicides. In the present study, we isolated a Bacillus velezensis strain TZ01 with potent antagonistic effect against three citrus pathogenic fungi: Diaporthe citri, Colletotrichum gloeosporioides and Alternaria alternata. The culture supernatant of this strain exhibited remarkable antifungal activity on potato dextrose agar plates and detached leaves of five citrus varieties. Treatment with TZ01 culture supernatant obviously affected the hyphal morphology and caused nucleic acid leakage. The crude lipopeptides (LPs) extracted from the culture supernatant were found as the major active ingredients, and could maintain the activity under a wide range of temperature and pH and ultraviolet radiation. Furthermore, the type of LPs, produced in vitro, were explored. Whole-genome sequencing of TZ01 revealed secondary metabolite gene clusters encoding synthetases for non-ribosomal peptides and polyketide production, and gene clusters responsible for the synthesis of three important LPs (surfactin, iturin, and fengycin) were identified in the genome. The liquid chromatography-mass spectrometry analysis confirmed the presence of various homologs of surfactin A, bacillomycin D, and fengycin A in the extracted LPs. Taken together, these results contribute to the possible biocontrol mechanisms of B. velezensis strain TZ01, as well as providing a promising new candidate strain as a biological control agent for controlling citrus fungal pathogens.
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Affiliation(s)
- Baoju An
- The Citrus Research Institute of Zhejiang Province, Taizhou, China
- Key Laboratory of Fruit and Vegetable Function and Health Research of Taizhou, Taizhou, China
| | - Danchao Du
- The Citrus Research Institute of Zhejiang Province, Taizhou, China
- Key Laboratory of Fruit and Vegetable Function and Health Research of Taizhou, Taizhou, China
| | - Zhendong Huang
- The Citrus Research Institute of Zhejiang Province, Taizhou, China
- Key Laboratory of Fruit and Vegetable Function and Health Research of Taizhou, Taizhou, China
| | - Zhanxu Pu
- The Citrus Research Institute of Zhejiang Province, Taizhou, China
- Key Laboratory of Fruit and Vegetable Function and Health Research of Taizhou, Taizhou, China
| | - Jia Lv
- The Citrus Research Institute of Zhejiang Province, Taizhou, China
- Key Laboratory of Fruit and Vegetable Function and Health Research of Taizhou, Taizhou, China
| | - Li Zhu
- The Citrus Research Institute of Zhejiang Province, Taizhou, China
- Key Laboratory of Fruit and Vegetable Function and Health Research of Taizhou, Taizhou, China
| | - Shunmin Liu
- The Citrus Research Institute of Zhejiang Province, Taizhou, China
- Key Laboratory of Fruit and Vegetable Function and Health Research of Taizhou, Taizhou, China
| | - Liping Zhang
- The Citrus Research Institute of Zhejiang Province, Taizhou, China
- Key Laboratory of Fruit and Vegetable Function and Health Research of Taizhou, Taizhou, China
| | - Guoqing Chen
- The Citrus Research Institute of Zhejiang Province, Taizhou, China
- Key Laboratory of Fruit and Vegetable Function and Health Research of Taizhou, Taizhou, China
| | - Lianming Lu
- The Citrus Research Institute of Zhejiang Province, Taizhou, China
- Key Laboratory of Fruit and Vegetable Function and Health Research of Taizhou, Taizhou, China
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Yousfi S, Krier F, Deracinois B, Steels S, Coutte F, Frikha-Gargouri O. Characterization of Bacillus velezensis 32a metabolites and their synergistic bioactivity against crown gall disease. Microbiol Res 2024; 280:127569. [PMID: 38103466 DOI: 10.1016/j.micres.2023.127569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2023] [Revised: 11/22/2023] [Accepted: 12/06/2023] [Indexed: 12/19/2023]
Abstract
Crown gall disease caused by Agrobacterium tumefaciens is considered to be the main bacterial threat of stone fruit plants in Mediterranean countries. In a previous study, Bacillus velezensis strain 32a was isolated from Tunisian rhizosphere soil and revealed high antagonistic potential against A. tumefaciens strains. In order to better characterize the antagonistic activity of this strain against this important plant pathogen, the production of secondary metabolites was analyzed using liquid chromatography coupled with mass spectrometry. The results revealed the production of different compounds identified as surfactins, fengycins, iturins and bacillibactin belonging to the lipopeptide group, three polyketides (macrolactins, oxydifficidin and bacillaenes), bacilysin and its chlorinated derivative; chlorotetaine. The involvement of lipopeptides in this antagonistic activity was ruled out by performing agar and broth dilution tests with pure molecules. Thus, the construction of B. velezensis 32a mutants defective in polyketides and bacilysin biosynthesis and their antagonistic activity was performed and compared to a set of derivative mutants of a comparable strain, B. velezensis GA1. The defective difficidin mutants (△dfnA and △dfnD) were unable to inhibit the growth of A. tumefaciens, indicating the high-level contribution of difficidin in the antagonism process. While the macrolactin deficient mutant (∆mlnA) slightly decreased the activity, suggesting a synergetic effect with difficidin. Remarkably, the mutant △dhbC only deficient in bacillibactin production showed significant reduction in its capacity to inhibit the growth of Agrobacterium.Taken collectively, our results showed the strong synergetic effect of difficidin and macrolactins and the significant implication of siderophore to manage crown gall disease.
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Affiliation(s)
- Sarra Yousfi
- Laboratory of Biopesticides, Center of Biotechnology of Sfax, University of Sfax, Sfax, Tunisia; Université de Lille, UMRt BioEcoAgro 1158-INRAE, Equipe Métabolites Secondaires d'Origine Microbienne, Institut Charles Viollette, F-59000 Lille, France
| | - François Krier
- Université de Lille, UMRt BioEcoAgro 1158-INRAE, Equipe Métabolites Secondaires d'Origine Microbienne, Institut Charles Viollette, F-59000 Lille, France
| | - Barbara Deracinois
- Université de Lille, UMRt BioEcoAgro 1158-INRAE, Equipe Métabolites Secondaires d'Origine Microbienne, Institut Charles Viollette, F-59000 Lille, France
| | - Sébastien Steels
- Université de Liège, UMRt BioEcoAgro 1158-INRAE, équipe Métabolites Secondaires d'Origine Microbienne, TERRA Teaching and Research Centre, Gembloux Agro-Bio Tech, B-5030 Gembloux, Belgium
| | - François Coutte
- Université de Lille, UMRt BioEcoAgro 1158-INRAE, Equipe Métabolites Secondaires d'Origine Microbienne, Institut Charles Viollette, F-59000 Lille, France.
| | - Olfa Frikha-Gargouri
- Laboratory of Biopesticides, Center of Biotechnology of Sfax, University of Sfax, Sfax, Tunisia
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Kashyap S, Sharma I, Dowarah B, Barman R, Gill SS, Agarwala N. Plant and soil-associated microbiome dynamics determine the fate of bacterial wilt pathogen Ralstonia solanacearum. PLANTA 2023; 258:57. [PMID: 37524889 DOI: 10.1007/s00425-023-04209-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2023] [Accepted: 07/18/2023] [Indexed: 08/02/2023]
Abstract
MAIN CONCLUSION Plant and the soil-associated microbiome is important for imparting bacterial wilt disease tolerance in plants. Plants are versatile organisms that are endowed with the capacity to withstand various biotic and abiotic stresses despite having no locomotory abilities. Being the agent for bacterial wilt (BW) disease, Ralstonia solanacearum (RS) colonizes the xylem vessels and limits the water supply to various plant parts, thereby causing wilting. The havoc caused by RS leads to heavy losses in crop productivity around the world, for which a sustainable mitigation strategy is urgently needed. As several factors can influence plant-microbe interactions, comprehensive understanding of plant and soil-associated microbiome under the influence of RS and various environmental/edaphic conditions is important to control this pathogen. This review mainly focuses on microbiome dynamics associated with BW disease and also provide update on microbial/non-microbial approaches employed to control BW disease in crop plants.
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Affiliation(s)
- Sampurna Kashyap
- Department of Botany, Gauhati University, Gopinath Bordoloi Nagar, Jalukbari, Guwahati, Assam, 781014, India
| | - Indrani Sharma
- Department of Botany, Gauhati University, Gopinath Bordoloi Nagar, Jalukbari, Guwahati, Assam, 781014, India
| | - Bhaskar Dowarah
- Department of Botany, Bahona College, Bahona, Jorhat, Assam, 785101, India
| | - Ramen Barman
- Department of Botany, Gauhati University, Gopinath Bordoloi Nagar, Jalukbari, Guwahati, Assam, 781014, India
| | - Sarvajeet Singh Gill
- Centre for Biotechnology, Maharshi Dayanand University, Rohtak, Haryana, 124001, India.
| | - Niraj Agarwala
- Department of Botany, Gauhati University, Gopinath Bordoloi Nagar, Jalukbari, Guwahati, Assam, 781014, India.
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Wang Y, Yang L, Zhou X, Wang Y, Liang Y, Luo B, Dai Y, Wei Z, Li S, He R, Ding W. Molecular mechanism of plant elicitor daphnetin-carboxymethyl chitosan nanoparticles against Ralstonia solanacearum by activating plant system resistance. Int J Biol Macromol 2023; 241:124580. [PMID: 37100321 DOI: 10.1016/j.ijbiomac.2023.124580] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Revised: 02/23/2023] [Accepted: 04/20/2023] [Indexed: 04/28/2023]
Abstract
The exploration of biopolymer-based materials to avoid hazardous chemicals in agriculture has gained enormous importance for sustainable crop protection. Due to its good biocompatibility and water solubility, carboxymethyl chitosan (CMCS) has been widely applied as a pesticide carrier biomaterial. However, the mechanism by which carboxymethyl chitosan-grafted natural product nanoparticles induce tobacco systemic resistance against bacterial wilt remains largely unknown. In this study, water-soluble CMCS-grafted daphnetin (DA) nanoparticles (DA@CMCS-NPs) were successfully synthesized, characterized, and assessed for the first time. The grafting rate of DA in CMCS was 10.05 %, and the water solubility was increased. In addition, DA@CMCS-NPs significantly increased the activities of CAT, PPO and SOD defense enzymes, activated the expression of PR1 and NPR1, and suppressed the expression of JAZ3. DA@CMCS-NPs could induce immune responses against R. solanacearum in tobacco, including increases in defense enzymes and overexpression of pathogenesis-related (PR) proteins. The application of DA@CMCS-NPs effectively suppressed the development of tobacco bacterial wilt in pot experiments, and the control efficiency was as high as 74.23 %, 67.80 %, 61.67 % at 8, 10, and 12 days after inoculation. Additionally, DA@CMCS-NPs has excellent biosafety. Therefore, this study highlighted the application of DA@CMCS-NPs in manipulating tobacco to generate defense responses against R. solanacearum, which can be attributed to systemic resistance.
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Affiliation(s)
- Yao Wang
- Laboratory of Natural Products Pesticides, College of Plant Protection, Southwest University, Chongqing 400715, China
| | - Liang Yang
- Laboratory of Natural Products Pesticides, College of Plant Protection, Southwest University, Chongqing 400715, China
| | - Xiao Zhou
- Laboratory of Natural Products Pesticides, College of Plant Protection, Southwest University, Chongqing 400715, China
| | - Ye Wang
- Laboratory of Natural Products Pesticides, College of Plant Protection, Southwest University, Chongqing 400715, China
| | - Yijia Liang
- Laboratory of Natural Products Pesticides, College of Plant Protection, Southwest University, Chongqing 400715, China
| | - Binshao Luo
- Laboratory of Natural Products Pesticides, College of Plant Protection, Southwest University, Chongqing 400715, China
| | - Yuhao Dai
- Laboratory of Natural Products Pesticides, College of Plant Protection, Southwest University, Chongqing 400715, China
| | - Zhouling Wei
- Laboratory of Natural Products Pesticides, College of Plant Protection, Southwest University, Chongqing 400715, China
| | - Shili Li
- Laboratory of Natural Products Pesticides, College of Plant Protection, Southwest University, Chongqing 400715, China
| | - Rong He
- Chongqing Tobacco Industry Co., Ltd., Chongqing 400060, China.
| | - Wei Ding
- Laboratory of Natural Products Pesticides, College of Plant Protection, Southwest University, Chongqing 400715, China.
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