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Wang D, Lin H, Shan Y, Song J, Zhang DD, Dai XF, Han D, Chen JY. The potential of Burkholderia gladioli KRS027 in plant growth promotion and biocontrol against Verticillium dahliae revealed by dual transcriptome of pathogen and host. Microbiol Res 2024; 287:127836. [PMID: 39018831 DOI: 10.1016/j.micres.2024.127836] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2024] [Revised: 07/11/2024] [Accepted: 07/13/2024] [Indexed: 07/19/2024]
Abstract
Verticillium dahliae is a destructive, soil-borne pathogen that causes significant losses on numerous important dicots. Recently, beneficial microbes inhabiting the rhizosphere have been exploited and used to control plant diseases. In the present study, Burkholderia gladioli KRS027 demonstrated excellent inhibitory effects against Verticillium wilt in cotton seedlings. Plant growth and development was promoted by affecting the biosynthesis and signaling pathways of brassinosteroids (BRs), gibberellins (GAs), and auxins, consequently promoting stem elongation, shoot apical meristem, and root apical tissue division in cotton. Furthermore, based on the host transcriptional response to V. dahliae infection, it was found that KRS027 modulates the plants to maintain cell homeostasis and respond to other pathogen stress. Moreover, KRS027 induced disruption of V. dahliae cellular structures, as evidenced by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) analyses. Based on the comparative transcriptomic analysis between KRS027 treated and control group of V. dahliae, KRS027 induced substantial alterations in the transcriptome, particularly affecting genes encoding secreted proteins, small cysteine-rich proteins (SCRPs), and protein kinases. In addition, KRS027 suppressed the growth of different clonal lineages of V. dahliae strains through metabolites, and volatile organic compounds (VOCs) released by KRS027 inhibited melanin biosynthesis and microsclerotia development. These findings provide valuable insights into an alternative biocontrol strategy for Verticillium wilt, demonstrating that the antagonistic bacterium KRS027 holds promise as a biocontrol agent for promoting plant growth and managing disease occurrence.
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Affiliation(s)
- Dan Wang
- State Key Laboratory of Subtropical Silviculture, School of Forestry and Biotechnology, Zhejiang A & F University, Hangzhou 311300, China
| | - Haiping Lin
- State Key Laboratory of Subtropical Silviculture, School of Forestry and Biotechnology, Zhejiang A & F University, Hangzhou 311300, China
| | - Yujia Shan
- The State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, 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 100193, China
| | - Dan-Dan Zhang
- The State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China; Western Agricultural Research Center, Chinese Academy of Agricultural Sciences, Changji 831100, China
| | - 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 100193, China; Western Agricultural Research Center, Chinese Academy of Agricultural Sciences, Changji 831100, China
| | - Dongfei Han
- School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China; State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China, Beijing 100081, 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 100193, China; Western Agricultural Research Center, Chinese Academy of Agricultural Sciences, Changji 831100, China.
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Gonzales M, Kergaravat B, Jacquet P, Billot R, Grizard D, Chabrière É, Plener L, Daudé D. Disrupting quorum sensing as a strategy to inhibit bacterial virulence in human, animal, and plant pathogens. Pathog Dis 2024; 82:ftae009. [PMID: 38724459 PMCID: PMC11110857 DOI: 10.1093/femspd/ftae009] [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: 12/04/2023] [Revised: 04/18/2024] [Accepted: 05/02/2024] [Indexed: 05/23/2024] Open
Abstract
The development of sustainable alternatives to conventional antimicrobials is needed to address bacterial virulence while avoiding selecting resistant strains in a variety of fields, including human, animal, and plant health. Quorum sensing (QS), a bacterial communication system involved in noxious bacterial phenotypes such as virulence, motility, and biofilm formation, is of utmost interest. In this study, we harnessed the potential of the lactonase SsoPox to disrupt QS of human, fish, and plant pathogens. Lactonase treatment significantly alters phenotypes including biofilm formation, motility, and infection capacity. In plant pathogens, SsoPox decreased the production of plant cell wall degrading enzymes in Pectobacterium carotovorum and reduced the maceration of onions infected by Burkholderia glumae. In human pathogens, lactonase treatment significantly reduced biofilm formation in Acinetobacter baumannii, Burkholderia cepacia, and Pseudomonas aeruginosa, with the cytotoxicity of the latter being reduced by SsoPox treatment. In fish pathogens, lactonase treatment inhibited biofilm formation and bioluminescence in Vibrio harveyi and affected QS regulation in Aeromonas salmonicida. QS inhibition can thus be used to largely impact the virulence of bacterial pathogens and would constitute a global and sustainable approach for public, crop, and livestock health in line with the expectations of the One Health initiative.
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Affiliation(s)
- Mélanie Gonzales
- Aix Marseille University, MEPHI, IHU-Méditerranée Infection, 19-21 Boulevard Jean Moulin, Marseille 13005, France
- Gene&GreenTK, 19-21 Boulevard Jean Moulin, Marseille 13005, France
| | - Baptiste Kergaravat
- Aix Marseille University, MEPHI, IHU-Méditerranée Infection, 19-21 Boulevard Jean Moulin, Marseille 13005, France
- Gene&GreenTK, 19-21 Boulevard Jean Moulin, Marseille 13005, France
| | - Pauline Jacquet
- Gene&GreenTK, 19-21 Boulevard Jean Moulin, Marseille 13005, France
| | - Raphaël Billot
- Gene&GreenTK, 19-21 Boulevard Jean Moulin, Marseille 13005, France
| | - Damien Grizard
- Gene&GreenTK, 19-21 Boulevard Jean Moulin, Marseille 13005, France
| | - Éric Chabrière
- Aix Marseille University, MEPHI, IHU-Méditerranée Infection, 19-21 Boulevard Jean Moulin, Marseille 13005, France
| | - Laure Plener
- Gene&GreenTK, 19-21 Boulevard Jean Moulin, Marseille 13005, France
| | - David Daudé
- Gene&GreenTK, 19-21 Boulevard Jean Moulin, Marseille 13005, France
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Chen S, Chen Z, Lin X, Zhou X, Yang S, Tan H. Why different sugarcane cultivars show different resistant abilities to smut? : Comparisons of endophytic microbial compositions and metabolic functions in stems of sugarcane cultivars with different abilities to resist smut. BMC PLANT BIOLOGY 2023; 23:427. [PMID: 37710150 PMCID: PMC10500793 DOI: 10.1186/s12870-023-04446-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2023] [Accepted: 09/06/2023] [Indexed: 09/16/2023]
Abstract
To elucidate the mechanisms underlying the resistance to smut of different sugarcane cultivars, endophytic bacterial and fungal compositions, functions and metabolites in the stems of the sugarcane cultivars were analyzed using high-throughput sequencing techniques and nontargeted metabolomics. The results showed that the levels of ethylene, salicylic acid and jasmonic acid in sugarcane varieties that were not sensitive to smut were all higher than those in sensitive sugarcane varieties. Moreover, endophytic fungi, such as Ramichloridium, Alternaria, Sarocladium, Epicoccum, and Exophiala species, could be considered antagonistic to sugarcane smut. Additionally, the highly active arginine and proline metabolism, pentose phosphate pathway, phenylpropanoid biosynthesis, and tyrosine metabolism in sugarcane varieties that were not sensitive to smut indicated that these pathways contribute to resistance to smut. All of the above results suggested that the relatively highly abundant antagonistic microbes and highly active metabolic functions of endophytes in non-smut-sensitive sugarcane cultivars were important for their relatively high resistance to smut.
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Affiliation(s)
- Siyu Chen
- Guangxi Key Laboratory of Agro-Environment and Agro-Product Safety, National Demonstration Center for Experimental Plant Science Education, Agricultural College, Guangxi University, 100 University Road, Nanning, Guangxi, 530004, P.R. China
| | - Zhongliang Chen
- Guangxi Key Laboratory of Sugarcane Genetic Improvement, Guangxi Academy of Agricultural Sciences, 530007, Guangxi, P.R. China
| | - Xinru Lin
- Guangxi Key Laboratory of Agro-Environment and Agro-Product Safety, National Demonstration Center for Experimental Plant Science Education, Agricultural College, Guangxi University, 100 University Road, Nanning, Guangxi, 530004, P.R. China
| | - Xinyan Zhou
- Guangxi Key Laboratory of Agro-Environment and Agro-Product Safety, National Demonstration Center for Experimental Plant Science Education, Agricultural College, Guangxi University, 100 University Road, Nanning, Guangxi, 530004, P.R. China
| | - Shangdong Yang
- Guangxi Key Laboratory of Agro-Environment and Agro-Product Safety, National Demonstration Center for Experimental Plant Science Education, Agricultural College, Guangxi University, 100 University Road, Nanning, Guangxi, 530004, P.R. China.
| | - Hongwei Tan
- Guangxi Key Laboratory of Sugarcane Genetic Improvement, Guangxi Academy of Agricultural Sciences, 530007, Guangxi, P.R. China.
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Webster G, Mullins AJ, Petrova YD, Mahenthiralingam E. Polyyne-producing Burkholderia suppress Globisporangium ultimum damping-off disease of Pisum sativum (pea). Front Microbiol 2023; 14:1240206. [PMID: 37692405 PMCID: PMC10485841 DOI: 10.3389/fmicb.2023.1240206] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Accepted: 08/07/2023] [Indexed: 09/12/2023] Open
Abstract
Extensive crop losses are caused by oomycete and fungal damping-off diseases. Agriculture relies heavily on chemical pesticides to control disease, but due to safety concerns multiple agents have been withdrawn. Burkholderia were successfully used as commercial biopesticides because of their fungicidal activity and plant protective traits. However, their potential for opportunistic pathogenicity led to a moratorium on their registration as biopesticides. Subsequently, Burkholderia were shown to produce multiple specialised metabolites including potent antimicrobial polyynes. Cepacin A, a polyyne produced by Burkholderia ambifaria biopesticide strains was shown to be an important metabolite for the protection of germinating peas against Globisporangium ultimum (formerly Pythium) damping-off disease. Recently, there has been an expansion in bacterial polyyne discovery, with the metabolites and their biosynthetic gene pathways found in several bacterial genera including Burkholderia, Collimonas, Trinickia, and Pseudomonas. To define the efficacy of these bacterial polyyne producers as biopesticidal agents, we systematically evaluated metabolite production, in vitro microbial antagonism, and G. ultimum biocontrol across a panel of 30 strains representing four bacterial genera. In vitro polyyne production and antimicrobial activity was demonstrated for most strains, but only Burkholderia polyyne producers were protective within the in vivo G. ultimum damping-off pea protection model. B. ambifaria was the most effective cepacin-expressing biopesticide, and despite their known potential for plant pathogenicity Burkholderia gladioli and Burkholderia plantarii were uniquely shown to be protective as caryoynencin-producing biopesticides. In summary, Burkholderia are effective biopesticides due to their suite of antimicrobials, but the ability to deploy polyyne metabolites, caryoynencin and cepacin, is strain and species dependent. Graphical Abstract.
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Cui G, Bi X, Lu S, Jiang Z, Deng Y. A Genetically Engineered Escherichia coli for Potential Utilization in Fungal Smut Disease Control. Microorganisms 2023; 11:1564. [PMID: 37375066 DOI: 10.3390/microorganisms11061564] [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: 05/15/2023] [Revised: 06/03/2023] [Accepted: 06/09/2023] [Indexed: 06/29/2023] Open
Abstract
Sporisorium scitamineum, the basidiomycetous fungus that causes sugarcane smut and leads to severe losses in sugarcane quantity and quality, undergoes sexual mating to form dikaryotic hyphae capable of invading the host cane. Therefore, suppressing dikaryotic hyphae formation would potentially be an effective way to prevent host infection by the smut fungus, and the following disease symptom developments. The phytohormone methyl jasmonate (MeJA) has been shown to induce plant defenses against insects and microbial pathogens. In this study, we will verify that the exogenous addition of MeJA-suppressed dikaryotic hyphae formation in S. scitamineum and Ustilago maydis under in vitro culture conditions, and the maize smut symptom caused by U. maydis, could be effectively suppressed by MeJA in a pot experiment. We constructed an Escherichia coli-expressing plant JMT gene, encoding a jasmonic acid carboxyl methyl transferase that catalyzes conversion from jasmonic acid (JA) to MeJA. By GC-MS, we will confirm that the transformed E. coli, designated as the pJMT strain, was able to produce MeJA in the presence of JA and S-adenosyl-L-methionine (SAM as methyl donor). Furthermore, the pJMT strain was able to suppress S. scitamineum filamentous growth under in vitro culture conditions. It waits to further optimize JMT expression under field conditions in order to utilize the pJMT strain as a biocontrol agent (BCA) of sugarcane smut disease. Overall, our study provides a potentially novel method for controlling crop fungal diseases by boosting phytohormone biosynthesis.
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Affiliation(s)
- Guobing Cui
- Guangdong Laboratory for Lingnan Modern Agriculture, South China Agricultural University, Guangzhou 510642, China
- Henry Fork School of Biology and Agriculture, Shaoguan University, Shaoguan 512000, China
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou 510642, China
| | - Xinping Bi
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou 510642, China
| | - Shan Lu
- State Key Laboratory for Conservation and Utilization of Subtropical Ago-Bioresouces Ministry and Province Co-Sponsored Collaborative Innovation Center for Sugarcane and Sugar Industry, Nanning 530004, China
| | - Zide Jiang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou 510642, China
| | - Yizhen Deng
- Guangdong Laboratory for Lingnan Modern Agriculture, South China Agricultural University, Guangzhou 510642, China
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou 510642, China
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Pal G, Saxena S, Kumar K, Verma A, Sahu PK, Pandey A, White JF, Verma SK. Endophytic Burkholderia: Multifunctional roles in plant growth promotion and stress tolerance. Microbiol Res 2022; 265:127201. [PMID: 36167006 DOI: 10.1016/j.micres.2022.127201] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2022] [Revised: 07/21/2022] [Accepted: 09/13/2022] [Indexed: 11/19/2022]
Abstract
The genus Burkholderia has proven potential in improving plant performance. In recent decades, a huge diversity of Burkholderia spp. have been reported with diverse capabilities of plant symbiosis which could be harnessed to enhance plant growth and development. Colonization of endophytic Burkholderia spp. have been extensively studied through techniques like advanced microscopy, fluorescent labelling, PCR based assays, etc., and found to be systemically distributed in plants. Thus, use of these biostimulant microbes holds the promise of improving quality and quantity of crops. The endophytic Burkholderia spp. have been found to support plant functions along with boosting nutrient availability, especially under stress. Endophytic Burkholderia spp. improve plant survival against deadly pathogens via mechanisms like competition, induced systemic resistance, and antibiosis. At the same time, they are reported to extend plant tolerance towards multiple abiotic stresses especially drought, salinity, and cold. Several attempts have been made to decipher the potential of Burkholderia spp. by genome mining, and these bacteria have been found to harbour genes for plant symbiosis and for providing multiple benefits to host plants. Characteristics specific for host recognition and nutrient acquisition were confirmed in endophytic Burkholderia by genomics and proteomics-based studies. This could pave the way for harnessing Burkholderia spp. for biotechnological applications like biotransformation, phytoremediation, insecticidal activity, antimicrobials, etc. All these make Burkholderia spp. a promising microbial agent in improving plant performance under multiple adversities. Thus, the present review highlights critical roles of endophytic Burkholderia spp., their colonization, alleviation of biotic and abiotic stresses, biotechnological applications and genomic insights.
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Affiliation(s)
- Gaurav Pal
- Centre of Advanced Study in Botany, Banaras Hindu University, Varanasi, UP, India
| | - Samiksha Saxena
- National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi, India
| | - Kanchan Kumar
- Centre of Advanced Study in Botany, Banaras Hindu University, Varanasi, UP, India
| | - Anand Verma
- Centre of Advanced Study in Botany, Banaras Hindu University, Varanasi, UP, India
| | - Pramod K Sahu
- National Bureau of Agriculturally Important Microorganisms, Mau, UP, India
| | - Ashutosh Pandey
- National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi, India
| | - James F White
- Department of Plant Biology, Rutgers University, New Brunswick, NJ, USA.
| | - Satish K Verma
- Centre of Advanced Study in Botany, Banaras Hindu University, Varanasi, UP, India.
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Lacava PT, Bogas AC, Cruz FDPN. Plant Growth Promotion and Biocontrol by Endophytic and Rhizospheric Microorganisms From the Tropics: A Review and Perspectives. FRONTIERS IN SUSTAINABLE FOOD SYSTEMS 2022. [DOI: 10.3389/fsufs.2022.796113] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Currently, the tropics harbor a wide variety of crops to feed the global population. Rapid population expansion and the consequent major demand for food and agriculture-based products generate initiatives for tropical forest deforestation, which contributes to land degradation and the loss of macro and micronative biodiversity of ecosystems. Likewise, the entire dependence on fertilizers and pesticides also contributes to negative impacts on environmental and human health. To guarantee current and future food safety, as well as natural resource preservation, systems for sustainable crops in the tropics have attracted substantial attention worldwide. Therefore, the use of beneficial plant-associated microorganisms is a promising sustainable way to solve issues concerning modern agriculture and the environment. Efficient strains of bacteria and fungi are a rich source of natural products that might improve crop yield in numerous biological ways, such as nitrogen fixation, hormone production, mobilization of insoluble nutrients, and mechanisms related to plant biotic and abiotic stress alleviation. Additionally, these microorganisms also exhibit great potential for the biocontrol of phytopathogens and pest insects. This review addresses research regarding endophytic and rhizospheric microorganisms associated with tropical plants as a sustainable alternative to control diseases and enhance food production to minimize ecological damage in tropical ecosystems.
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Sugarcane Smut: Current Knowledge and the Way Forward for Management. J Fungi (Basel) 2021; 7:jof7121095. [PMID: 34947077 PMCID: PMC8703903 DOI: 10.3390/jof7121095] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Revised: 12/13/2021] [Accepted: 12/14/2021] [Indexed: 02/08/2023] Open
Abstract
Whip smut of sugarcane is the most serious and widely spread disease of sugarcane and causes a significant reduction in cane quantity and quality. The severity of this disease often depends on the pathogen races, environmental conditions, cultivar genotype and the interaction among these three factors. Under optimum climatic conditions, this disease has the potential to cause total crop failure. Resistance screening is an ongoing process due to the variability among smut pathogen isolates. Multiple races and mutation ability of smut pathogen makes the breeding task more complex. A number of studies on various aspects of the disease epidemiology and management have been published. Due to many overlapping characteristics within the species complex, there is a dearth of information on early detection and strategies to control the smut pathogen. Furthermore, there is a need to coordinate these findings to expedite its research and control. In this paper, we summarize the disease etiology, especially disease impact on the qualitative and quantitative parameters of sugarcane. We also gathered research progress on molecular-based detection and available information on genetic variability in S.scitamineum. The research on the set of management options needed to effectively cope with the disease are reviewed herein. The present review is expected to be helpful for the further investigation on smut resistance in sugarcane.
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Ahmad T, Bashir A, Farooq S, Riyaz-Ul-Hassan S. Burkholderia gladioli E39CS3, an endophyte of Crocus sativus Linn., induces host resistance against corm-rot caused by Fusarium oxysporum. J Appl Microbiol 2021; 132:495-508. [PMID: 34170610 DOI: 10.1111/jam.15190] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Revised: 05/19/2021] [Accepted: 06/13/2021] [Indexed: 01/02/2023]
Abstract
AIM To investigate the role of the leading saffron endophyte Burkholderia gladioli strain E39CS3 (BG-E39) in the inhibition of corm-rot and induced systemic resistance (ISR) in the host against the saffron specific pathogen, Fusarium oxysporum. METHODS AND RESULTS We studied the interaction between BG-E39 and the corm-rot pathogen F. oxysporum in vitro and in vivo. BG-E39 strongly inhibited both the F. oxysporum strains and other saffron-specific and non-specific pathogens used in this study. Confrontation and microscopic analyses revealed that the endophyte possessed fungicidal activity against the pathogens and effectively induced cell death in the mycelia. The endophyte produced chitinases as well as β-1,3-glucanase that may be involved in the pathogen cell wall degradation. BG-E39 did not cause corm-rot in Crocus sativus and the closely related plant, Gladiolus, thus establishing that it is non-pathogenic to these plants. The endophyte reduced corm-rot through antibiosis and enhanced the endogenous jasmonic acid (JA) levels and expression of JA-regulated and other plant defence genes. CONCLUSIONS The bacterial endophyte BG-E39 provides resistance to the host plant against F. oxysporum corm-rot in nature. SIGNIFICANCE AND IMPACT OF THE STUDY The current study discovers the role of the saffron endophyte BG-E39 in providing resistance to the host against corm-rot. Therefore, this endophyte is a potential candidate for developing a microbial formulation for the biocontrol of the most common disease of C. sativus.
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Affiliation(s)
- Tanveer Ahmad
- Fermentation and Microbial Biotechnology Division, CSIR-Indian Institute of Integrative Medicine, Srinagar, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India
| | - Abid Bashir
- Fermentation and Microbial Biotechnology Division, CSIR-Indian Institute of Integrative Medicine, Srinagar, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India
| | - Sadaqat Farooq
- Fermentation and Microbial Biotechnology Division, CSIR-Indian Institute of Integrative Medicine, Srinagar, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India
| | - Syed Riyaz-Ul-Hassan
- Fermentation and Microbial Biotechnology Division, CSIR-Indian Institute of Integrative Medicine, Srinagar, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India
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Sarli DA, Sánchez LA, Delgado OD. Burkholderia gladioli MB39 an Antarctic Strain as a Biocontrol Agent. Curr Microbiol 2021; 78:2332-2344. [PMID: 33904974 DOI: 10.1007/s00284-021-02492-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2020] [Accepted: 04/13/2021] [Indexed: 11/30/2022]
Abstract
Bioprospecting sub-explored environments such as Antarctic locations leads to finding out diverse activities, reducing harmful chemical usage that affects both human health and the environment. In this study, ~ 7000 cold-adapted bacterial strains were isolated from samples around Melchior Antarctic Base at 5 °C and more than 13,000 at 15 °C. Out of them, 900 different colony morphotypes were evaluated for antimicrobial production, and 13 isolates demonstrated antibacterial and antifungal activities. One isolate, closely related to Burkholderia gladioli according to 16S rDNA (99.8%), gyrB (99.6%) and Cpn60 (99.4%) gene sequence analysis, showed a consistent, broad antimicrobial spectrum against both pathogenic and phytopathogenic bacteria. Its potent antifungal activity inhibits the growth of various plant pathogenic fungi, whereas it was mainly studied against Penicillium digitatum and Macrophomina phaseolina, the causal agents of blue mould in postharvest fruits and charcoal rot in soybean crops, respectively. The antibacterial compound exhibited low molecular weight (< 6000 Da), resistance to lytic enzymes and stability in a broad range of temperature and pHs. Observations of the B. gladioli MB39 antifungal effects over M. phaseolina mycelia by scanning electron microscopy showed alterations in hyphal structures, reduced hyphal extension, and severe cell morphology changes such as cytoplasmic leakage, flattened and empty mycelia. Here we report the isolation and identification of a cold-adapted B. gladioli strain. The results describe the effectiveness of the antarctic strain for bacterial and fungal phytopathogens biocontrol and its potential for crop protection plans.
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Affiliation(s)
- Dinorah A Sarli
- PROIMI-CONICET, Av. Belgrano y Pje. Caseros, 4000, San Miguel de Tucumán, Argentina
| | - Leandro A Sánchez
- PROIMI-CONICET, Av. Belgrano y Pje. Caseros, 4000, San Miguel de Tucumán, Argentina
| | - Osvaldo D Delgado
- PROIMI-CONICET, Av. Belgrano y Pje. Caseros, 4000, San Miguel de Tucumán, Argentina. .,Fac. de Ciencias Exactas y Nat. (FACEN), Centro de Biología Molecular y Biotecnología (CEBIOTEC), Universidad Nacional de Catamarca (UNCa), Av. Belgrano 300, 4700, Catamarca, Argentina.
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