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Díaz-Díaz M, Antón-Domínguez BI, Raya MC, Bernal-Cabrera A, Medina-Marrero R, Trapero A, Agustí-Brisach C. Streptomyces spp. Strains as Potential Biological Control Agents against Verticillium Wilt of Olive. J Fungi (Basel) 2024; 10:138. [PMID: 38392810 PMCID: PMC10890128 DOI: 10.3390/jof10020138] [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: 01/02/2024] [Revised: 01/19/2024] [Accepted: 02/06/2024] [Indexed: 02/24/2024] Open
Abstract
Verticillium wilt of olive (VWO) caused by Verticillium dahliae is considered a major olive (Olea europaea) disease in Mediterranean-type climate regions. The lack of effective chemical products against VWO makes it necessary to search for alternatives such as biological control. The main goal of this study was to evaluate the effect of six Streptomyces spp. strains as biological control agents (BCAs) against VWO. All of them were molecularly characterized by sequencing 16S or 23S rRNA genes and via phylogenetic analysis. Their effect was evaluated in vitro on the mycelial growth of V. dahliae (isolates V004 and V323) and on microsclerotia (MS) viability using naturally infested soils. Bioassays in olive plants inoculated with V. dahliae were also conducted to evaluate their effect against disease progress. In all the experiments, the reference BCAs Fusarium oxysporum FO12 and Aureobasidium pullulans AP08 were included for comparative purposes. The six strains were identified as Streptomyces spp., and they were considered as potential new species. All the BCAs, including Streptomyces strains, showed a significant effect on mycelial growth inhibition for both V. dahliae isolates compared to the positive control, with FO12 being the most effective, followed by AP08, while the Streptomyces spp. strains showed an intermediate effect. All the BCAs tested also showed a significant effect on the inhibition of germination of V. dahliae MS compared to the untreated control, with FO12 being the most effective treatment. Irrigation treatments with Streptomyces strain CBQ-EBa-21 or FO12 were significantly more effective in reducing disease severity and disease progress in olive plants inoculated with V. dahliae compared to the remaining treatments. This study represents the first approach to elucidating the potential effect of Streptomyces strains against VWO.
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Affiliation(s)
- Miriam Díaz-Díaz
- Centro de Bioactivos Químicos (CBQ), Universidad Central "Marta Abreu" de Las Villas (UCLV), Carretera Camajuaní km 5 1/2, Santa Clara 54830, Villa Clara, Cuba
| | - Begoña I Antón-Domínguez
- Departamento de Agronomía, (Unit of Excellence 'María de Maeztu' 2020-2024), Universidad de Córdoba, Campus de Rabanales, Edif. C4, 14071 Córdoba, Spain
| | - María Carmen Raya
- Departamento de Agronomía, (Unit of Excellence 'María de Maeztu' 2020-2024), Universidad de Córdoba, Campus de Rabanales, Edif. C4, 14071 Córdoba, Spain
| | - Alexander Bernal-Cabrera
- Centro de Investigaciones Agropecuarias (CIAP), Facultad de Ciencias Agropecuarias, Universidad Central "Marta Abreu" de Las Villas (UCLV), Carretera Camajuaní km 5 1/2, Santa Clara 54830, Villa Clara, Cuba
- Departamento de Agronomía, Facultad de Ciencias Agropecuarias, Universidad Central "Marta Abreu" de Las Villas (UCLV), Carretera Camajuaní km 5 1/2, Santa Clara 54830, Villa Clara, Cuba
| | - Ricardo Medina-Marrero
- Centro de Bioactivos Químicos (CBQ), Universidad Central "Marta Abreu" de Las Villas (UCLV), Carretera Camajuaní km 5 1/2, Santa Clara 54830, Villa Clara, Cuba
| | - Antonio Trapero
- Departamento de Agronomía, (Unit of Excellence 'María de Maeztu' 2020-2024), Universidad de Córdoba, Campus de Rabanales, Edif. C4, 14071 Córdoba, Spain
| | - Carlos Agustí-Brisach
- Departamento de Agronomía, (Unit of Excellence 'María de Maeztu' 2020-2024), Universidad de Córdoba, Campus de Rabanales, Edif. C4, 14071 Córdoba, Spain
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Zou L, Zhang Y, Wang Q, Wang S, Li M, Huang J. Genetic diversity, plant growth promotion potential, and antimicrobial activity of culturable endophytic actinobacteria isolated from Aconitum carmichaelii Debeaux. J Appl Microbiol 2023; 134:lxad185. [PMID: 37580141 DOI: 10.1093/jambio/lxad185] [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: 04/18/2023] [Revised: 07/26/2023] [Accepted: 08/13/2023] [Indexed: 08/16/2023]
Abstract
AIM This study evaluated the phylogenetic diversity, plant growth promotion capacity, antifungal activity, and biocontrol potential of culturable actinobacterial endophytes isolated from the medicinal plant Aconitum carmichaelii Debeaux. METHODS AND RESULTS Isolation of actinobacteria from healthy A. carmichaelii plants was carried out on six different media. Full-length 16S rRNA gene was amplified by PCR from the genomic DNA of each strain. Indole-3-acetic acid and siderophore production were quantitatively assessed by the Salkowski and Chrome Azurol S methods, respectively. Rice seeds germination and seedling growth were employed to evaluate plant growth promotion capacities of candidate strains. Dual-culture assay and pot experiments were performed to investigate the antifungal and biocontrol potential of isolates. We obtained 129 actinobacterial isolates from A. carmichaelii, and they belonged to 49 species in 7 genera. These strains exhibited diverse plant growth promotion ability, among which one strain significantly enhanced rice seeds germination, while 31 strains significantly facilitated rice seedling growth. SWUST-123 showed strong antifungal activity against four pathogens in vitro and was most compatible with Qingchuan cultivar. SWUST-123 reduced around 40% of southern blight disease occurrence compared to blank control treatment. . CONCLUSION Aconitum carmichaelii harbored genetically diverse actinobacterial endophytes exhibiting diverse plant growth promotion and antifungal potential, some of which can be served as good candidates for biofertilizers and biocontrol agents.
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Affiliation(s)
- Lan Zou
- School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
| | - Yaopeng Zhang
- School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
| | - Qian Wang
- School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
| | - Siyu Wang
- School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
| | - Muyi Li
- School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
| | - Jing Huang
- School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
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Zou L, Wang Q, Li M, Wang S, Ye K, Dai W, Huang J. Culturable bacterial endophytes of Aconitum carmichaelii Debx. were diverse in phylogeny, plant growth promotion, and antifungal potential. Front Microbiol 2023; 14:1192932. [PMID: 37266004 PMCID: PMC10229814 DOI: 10.3389/fmicb.2023.1192932] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Accepted: 04/21/2023] [Indexed: 06/03/2023] Open
Abstract
Medicinal plants harbor tremendously diverse bacterial endophytes that maintain plant growth and health. In the present study, a total of 124 culturable bacterial endophytes were isolated from healthy Aconitum carmichaelii Debx. plants. These strains were clustered into 10 genera based on full-length 16S rDNA sequences, among which Bacillus and Pseudomonas were the dominant genera. In addition, A. carmichaelii may capture 10 potential new bacterial species based on multi-locus sequence analysis of three housekeeping genes (gyrA, rpoB, and atpD). The majority of these bacterial endophytes exhibited plant growth-promoting ability through diverse actions including the production of either indole acetic acid and siderophore or hydrolytic enzymes (glucanase, cellulose, and protease) and solubilization of phosphate or potassium. A total of 20 strains inhibited hyphal growth of fungal pathogens Sclerotium rolfsii and Fusarium oxysporum in vitro on root slices of A. carmichaelii by the dual-culture method, among which Pseudomonas sp. SWUSTb-19 showed the best antagonistic activity. Field experiment confirmed that Pseudomonas sp. SWUSTb-19 significantly reduced the occurrence of southern blight and promoted plant biomass compared with non-inoculation treatment. The possible mode of actions for Pseudomonas sp. SWUSTb-19 to antagonize against S. rolfsii involved the production of glucanase, siderophore, lipopeptides, and antimicrobial volatile compounds. Altogether, this study revealed that A. carmichaelii harbored diverse plant growth-promoting bacterial endophytes, and Pseudomonas sp. SWUSTb-19 could be served as a potential biocontrol agent against southern blight.
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Affiliation(s)
- Lan Zou
- School of Life Science and Engineering, Southwest University of Science and Technology, Miangyang, China
| | - Qian Wang
- School of Life Science and Engineering, Southwest University of Science and Technology, Miangyang, China
| | - Muyi Li
- School of Life Science and Engineering, Southwest University of Science and Technology, Miangyang, China
| | - Siyu Wang
- School of Life Science and Engineering, Southwest University of Science and Technology, Miangyang, China
| | - Kunhao Ye
- Institute of Traditional Chinese Medicinal Materials, Miangyang Academy of Agricultural Science, Mianyang, China
| | - Wei Dai
- Institute of Traditional Chinese Medicinal Materials, Miangyang Academy of Agricultural Science, Mianyang, China
| | - Jing Huang
- School of Life Science and Engineering, Southwest University of Science and Technology, Miangyang, China
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Liu J, Liang M, Lin T, Zhao Q, Wang H, Yang S, Guo Q, Wang X, Guo H, Cui L, Yan Y, Hieno A, Kageyama K, Suga H, Li M. A LAMP-Based Toolbox Developed for Detecting the Major Pathogens Affecting the Production and Quality of the Chinese Medicinal Crop Aconitum carmichaelii. PLANT DISEASE 2023; 107:658-666. [PMID: 35852903 DOI: 10.1094/pdis-05-22-1092-re] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Aconitum carmichaelii Debeaux is a traditional Chinese medicinal herb that has been utilized for approximately 2,000 years. However, as cultivation has increased, there have been more reports of A. carmichaelii infections caused by four major pathogenic fungal species, Fusarium oxysporum, F. solani, Mucor circinelloides, and Sclerotium rolfsii, resulting in increased disease incidences and limited production and quality. To detect these infections, we developed a LAMP-based toolbox in this study. The cytochrome c oxidase subunit 1 (cox1) gene, translation elongation factor-1α (EF-1α), internal transcribed spacer (ITS) regions of rDNA, and alcohol dehydrogenase 1 (ADH1) gene, respectively, were used to design species-specific LAMP primer sets for F. oxysporum, F. solani, S. rolfsii, and M. circinelloides. The results showed that the LAMP-based toolbox was effective at detecting pathogens in soil and plant materials. We also used this toolbox to investigate pathogen infection in the main planting regions of A. carmichaelii. Before harvesting, F. oxysporum, M. circinelloides, and S. rolfsii were commonly found in the planting fields and in infected A. carmichaelii plants. Therefore, the toolbox we developed will be useful for tracking these infections, as well as for disease control in A. carmichaelii.
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Affiliation(s)
- Jingzhe Liu
- The Key Laboratory of Medicinal Resources and Natural Pharmaceutical Chemistry, The Ministry of Education (Shaanxi Normal University), Xi'an, Shaanxi 710119, P.R. China
| | - Mengyi Liang
- College of Life Sciences, Shaanxi Normal University, Xi'an, Shaanxi 710119, P.R. China
| | - Tao Lin
- College of Life Sciences, Shaanxi Normal University, Xi'an, Shaanxi 710119, P.R. China
| | - Qing Zhao
- College of Life Sciences, Shaanxi Normal University, Xi'an, Shaanxi 710119, P.R. China
| | - Huiqin Wang
- College of Life Sciences, Shaanxi Normal University, Xi'an, Shaanxi 710119, P.R. China
| | - Shunyuan Yang
- College of Life Sciences, Shaanxi Normal University, Xi'an, Shaanxi 710119, P.R. China
| | - Qian Guo
- College of Life Sciences, Shaanxi Normal University, Xi'an, Shaanxi 710119, P.R. China
| | - Xinyi Wang
- The Key Laboratory of Medicinal Resources and Natural Pharmaceutical Chemistry, The Ministry of Education (Shaanxi Normal University), Xi'an, Shaanxi 710119, P.R. China
| | - Hua Guo
- College of Life Sciences, Shaanxi Normal University, Xi'an, Shaanxi 710119, P.R. China
| | - Langjun Cui
- The Key Laboratory of Medicinal Resources and Natural Pharmaceutical Chemistry, The Ministry of Education (Shaanxi Normal University), Xi'an, Shaanxi 710119, P.R. China
| | - Yaping Yan
- The Key Laboratory of Medicinal Resources and Natural Pharmaceutical Chemistry, The Ministry of Education (Shaanxi Normal University), Xi'an, Shaanxi 710119, P.R. China
| | - Ayaka Hieno
- River Basin Research Center, Gifu University, Gifu 501-1193, Japan
| | - Koji Kageyama
- River Basin Research Center, Gifu University, Gifu 501-1193, Japan
| | - Haruhisa Suga
- Life Science Research Center, Gifu University, Gifu 501-1193, Japan
| | - Mingzhu Li
- The Key Laboratory of Medicinal Resources and Natural Pharmaceutical Chemistry, The Ministry of Education (Shaanxi Normal University), Xi'an, Shaanxi 710119, P.R. China
- College of Life Sciences, Shaanxi Normal University, Xi'an, Shaanxi 710119, P.R. 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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Ryabova OV, Gagarina AA. Actinomycetes as the Basis of Probiotics for Plants. APPL BIOCHEM MICRO+ 2022. [DOI: 10.1134/s0003683822070055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Devi S, Sharma M, Manhas RK. Investigating the plant growth promoting and biocontrol potentiality of endophytic Streptomyces SP. SP5 against early blight in Solanum lycopersicum seedlings. BMC Microbiol 2022; 22:285. [PMID: 36447141 PMCID: PMC9706909 DOI: 10.1186/s12866-022-02695-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Accepted: 11/08/2022] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND Early blight (EB), caused by Alternaria solani, is one of the alarming diseases that restrict tomato production globally. Existing cultural practices and fungicide applications are not enough to control early blight diseases. Therefore, the study aimed to isolate, identify, and characterize an endophytic Streptomyces exhibiting the potential to control early blight in tomato and also promote plant growth. RESULTS From a Citrus jambhiri leaf, an endophytic Streptomyces sp. with antagonistic activity against Alternaria solani, Colletotrichum acutatum, Cladosporium herbarum, Alternaria brassicicola, Alternaria sp., Fusarium oxysporum and Fusarium sp. was isolated. It was identified as a Streptomyces sp. through 16S ribosomal DNA sequence analysis and designated as SP5. It also produced indole acetic acid which was confirmed by Salkowski reagent assay, TLC and HPLC analysis. Treatment of pathogen infected plants with Streptomyces sp. SP5 antagonists (culture cells/culture supernatant/solvent extract/ acetone precipitates) decreased the early blight disease incidence and significantly increased the various agronomic traits. CONCLUSION The present study concluded that Streptomyces sp. SP5 possessed antifungal activity against different fungal phytopathogens and had significant potential to control early blight disease and promote plant growth.
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Affiliation(s)
- Sapna Devi
- grid.411894.10000 0001 0726 8286Department of Microbiology, Guru Nanak Dev University, Amritsar, Punjab India
| | - Manish Sharma
- grid.411894.10000 0001 0726 8286Department of Microbiology, Guru Nanak Dev University, Amritsar, Punjab India
| | - Rajesh Kumari Manhas
- grid.411894.10000 0001 0726 8286Department of Microbiology, Guru Nanak Dev University, Amritsar, Punjab India
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Frąc M, Hannula ES, Bełka M, Salles JF, Jedryczka M. Soil mycobiome in sustainable agriculture. Front Microbiol 2022; 13:1033824. [PMID: 36519160 PMCID: PMC9742577 DOI: 10.3389/fmicb.2022.1033824] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Accepted: 10/24/2022] [Indexed: 07/21/2023] Open
Abstract
The soil microbiome contributes to several ecosystem processes. It plays a key role in sustainable agriculture, horticulture and forestry. In contrast to the vast number of studies focusing on soil bacteria, the amount of research concerning soil fungal communities is limited. This is despite the fact that fungi play a crucial role in the cycling of matter and energy on Earth. Fungi constitute a significant part of the pathobiome of plants. Moreover, many of them are indispensable to plant health. This group includes mycorrhizal fungi, superparasites of pathogens, and generalists; they stabilize the soil mycobiome and play a key role in biogeochemical cycles. Several fungal species also contribute to soil bioremediation through their uptake of high amounts of contaminants from the environment. Moreover, fungal mycelia stretch below the ground like blood vessels in the human body, transferring water and nutrients to and from various plants. Recent advances in high-throughput sequencing combined with bioinformatic tools have facilitated detailed studies of the soil mycobiome. This review discusses the beneficial effects of soil mycobiomes and their interactions with other microbes and hosts in both healthy and unhealthy ecosystems. It may be argued that studying the soil mycobiome in such a fashion is an essential step in promoting sustainable and regenerative agriculture.
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Affiliation(s)
- Magdalena Frąc
- Institute of Agrophysics, Polish Academy of Sciences, Lublin, Poland
| | | | - Marta Bełka
- Department of Forest Entomology and Pathology, Faculty of Forestry and Wood Technology, Poznań University of Life Sciences, Poznań, Poland
| | - Joana Falcao Salles
- Department of Microbial Ecology, Groningen Institute for Evolutionary Life Sciences, University of Groningen, Groningen, Netherlands
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The Arabidopsis thaliana–Streptomyces Interaction Is Controlled by the Metabolic Status of the Holobiont. Int J Mol Sci 2022; 23:ijms232112952. [PMID: 36361736 PMCID: PMC9655247 DOI: 10.3390/ijms232112952] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 10/20/2022] [Accepted: 10/21/2022] [Indexed: 11/26/2022] Open
Abstract
How specific interactions between plant and pathogenic, commensal, or mutualistic microorganisms are mediated and how bacteria are selected by a plant are important questions to address. Here, an Arabidopsis thaliana mutant called chs5 partially deficient in the biogenesis of isoprenoid precursors was shown to extend its metabolic remodeling to phenylpropanoids and lipids in addition to carotenoids, chlorophylls, and terpenoids. Such a metabolic profile was concomitant to increased colonization of the phyllosphere by the pathogenic strain Pseudomonas syringae pv. tomato DC3000. A thorough microbiome analysis by 16S sequencing revealed that Streptomyces had a reduced colonization potential in chs5. This study revealed that the bacteria–Arabidopsis interaction implies molecular processes impaired in the chs5 mutant. Interestingly, our results revealed that the metabolic status of A. thaliana was crucial for the specific recruitment of Streptomyces into the microbiota. More generally, this study highlights specific as well as complex molecular interactions that shape the plant microbiota.
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Pang Z, Mao X, Xia Y, Xiao J, Wang X, Xu P, Liu G. Multiomics Reveals the Effect of Root Rot on Polygonati Rhizome and Identifies Pathogens and Biocontrol Strain. Microbiol Spectr 2022; 10:e0238521. [PMID: 35225655 PMCID: PMC9045327 DOI: 10.1128/spectrum.02385-21] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Accepted: 02/10/2022] [Indexed: 01/19/2023] Open
Abstract
Root (rhizome) rot of Polygonatum plants has received substantial attention because it threatens yield and sustainable utilization in the polygonati rhizome industry. However, the potential pathogens that cause rhizome rot as well as the direct and indirect (via root-associated microbes) strategies by which Polygonatum defends against pathogens remain largely unknown. Herein, we used integrated multiomics of plant-targeted metabolomics and transcriptomics, microbiome, and culture-based methods to systematically investigate the interactions between the Polygonatum cyrtonema Hua root-associated microbiota and pathogens. We found that root rot inhibited P. cyrtonema rhizome growth and that the fresh weight significantly decreased (P < 0.001). The transcriptomic and metabonomic results showed that the expression of differentially expressed genes (DEGs) related to specialized metabolic and systemic resistance pathways, such as glycolysis/gluconeogenesis and flavonoid biosynthesis, cycloartenol synthase activity (related to saponin synthesis), mitogen-activated protein kinase (MAPK) signaling, and plant hormone signal transduction, was particularly increased in diseased rhizomes. Consistently, the contents of lactose, d-fructose, sarsasapogenin, asperulosidic acid, botulin, myricadoil, and other saponins, which are functional medicinal compounds present in P. cyrtonema rhizomes, were also increased in diseased plants infected with rhizome rot. The microbiome sequencing and culture results showed that root rot disrupted the P. cyrtonema bacterial and fungal communities and reduced the microbial diversity in the rhizomes and rhizosphere soil. We further found that a clear enrichment of Streptomyces violascens XTBG45 (HJB-XTBG45) in the healthy rhizosphere could control the root rot caused by Fusarium oxysporum and Colletotrichum spaethianum. Taken together, our results indicate that P. cyrtonema can modulate the plant immune system and metabolic processes and enrich beneficial root microbiota to defend against pathogens. IMPORTANCE Root (rhizome or tuber) reproduction is the main method for the agricultural cultivation of many important cash crops, and infected crop plants rot, exhibit retarded growth, and experience yield losses. While many studies have investigated medicinal plants and their functional medicinal compounds, the occurrence of root (rhizome) rot of plant and soil microbiota has received little attention. Therefore, we used integrated multiomics and culture-based methods to systematically study rhizome rot on the famous Chinese medicine Polygonatum cyrtonema and identify pathogens and beneficial microbiota of rhizome rot. Rhizome rot disrupted the Polygonatum-associated microbiota and reduced microbial diversity, and rhizome transcription and metabolic processes significantly changed. Our work provides evidence that rhizome rot not only changes rhizome transcription and functional metabolite contents but also impacts the microbial community diversity, assembly, and function of the rhizome and rhizosphere. This study provides a new friendly strategy for medicinal plant breeding and agricultural utilization.
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Affiliation(s)
- Zhiqiang Pang
- Crops Conservation and Breeding Base, CAS Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, China
- The Innovative Academy of Seed Design, Chinese Academy of Sciences, Menglun, China
| | - Xinyu Mao
- Crops Conservation and Breeding Base, CAS Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Yong Xia
- Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, China
| | - Jinxian Xiao
- School of Biological and Chemical Science, Pu’er University, Puer, China
| | - Xiaoning Wang
- Key Laboratory for Crop Breeding of Hainan Province, Haikou, China
- Sanya Institute, Hainan Academy of Agricultural Sciences, Sanya, China
| | - Peng Xu
- Crops Conservation and Breeding Base, CAS Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, China
- The Innovative Academy of Seed Design, Chinese Academy of Sciences, Menglun, China
| | - Guizhou Liu
- Crops Conservation and Breeding Base, CAS Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, China
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Djebaili R, Pellegrini M, Ercole C, Farda B, Kitouni M, Del Gallo M. Biocontrol of Soil-Borne Pathogens of Solanum lycopersicum L. and Daucus carota L. by Plant Growth-Promoting Actinomycetes: In Vitro and In Planta Antagonistic Activity. Pathogens 2021; 10:pathogens10101305. [PMID: 34684253 PMCID: PMC8538725 DOI: 10.3390/pathogens10101305] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Revised: 10/07/2021] [Accepted: 10/08/2021] [Indexed: 01/12/2023] Open
Abstract
Biotic stress caused by pathogenic microorganisms leads to damage in crops. Tomato and carrot are among the most important vegetables cultivated worldwide. These plants are attacked by several pathogens, affecting their growth and productivity. Fourteen plant growth-promoting actinomycetes (PGPA) were screened for their in vitro biocontrol activity against Solanum lycopersicum and Daucus carota microbial phytopathogens. Their antifungal activity was evaluated against Fusarium oxysporum f. sp. radicis-lycopersici (FORL) and Rhizoctonia solani (RHS). Antibacterial activity was evaluated against Pseudomonas syringae, Pseudomonas corrugata, Pseudomonas syringae pv. actinidiae, and Pectobacterium carotovorum subsp. carotovorum. Strains that showed good in vitro results were further investigated in vitro (cell-free supernatants activity, scanning electron microscope observations of fungal inhibition). The consortium of the most active PGPA was then utilized as biocontrol agents in planta experiments on S. lycopersicum and D. carota. The Streptomyces albidoflavus H12 and Nocardiopsis aegyptica H14 strains showed the best in vitro biocontrol activities. The diffusible and volatile compounds and cell-free supernatants of these strains showed both antifungal (in vitro inhibition up to 85%, hyphal desegregation and fungicidal properties) and antibacterial activity (in vitro inhibition >25 mm and bactericidal properties). Their consortium was also able to counteract the infection symptoms of microbial phytopathogens during in planta experiments, improving plant status. The results obtained highlight the efficacy of the selected actinomycetes strains as biocontrol agents of S. lycopersicum and D. carota.
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Affiliation(s)
- Rihab Djebaili
- Department of Life, Health and Environmental Sciences, University of L’Aquila, Coppito, 67100 L’Aquila, Italy; (R.D.); (C.E.); (B.F.); (M.D.G.)
- Laboratory of Microbiological Engineering and Applications, University of Brothers Mentouri Constantine 1, Ain El Bey Road, Constantine 25000, Algeria;
| | - Marika Pellegrini
- Department of Life, Health and Environmental Sciences, University of L’Aquila, Coppito, 67100 L’Aquila, Italy; (R.D.); (C.E.); (B.F.); (M.D.G.)
- Correspondence: ; Tel.: +39-0862433246
| | - Claudia Ercole
- Department of Life, Health and Environmental Sciences, University of L’Aquila, Coppito, 67100 L’Aquila, Italy; (R.D.); (C.E.); (B.F.); (M.D.G.)
| | - Beatrice Farda
- Department of Life, Health and Environmental Sciences, University of L’Aquila, Coppito, 67100 L’Aquila, Italy; (R.D.); (C.E.); (B.F.); (M.D.G.)
| | - Mahmoud Kitouni
- Laboratory of Microbiological Engineering and Applications, University of Brothers Mentouri Constantine 1, Ain El Bey Road, Constantine 25000, Algeria;
| | - Maddalena Del Gallo
- Department of Life, Health and Environmental Sciences, University of L’Aquila, Coppito, 67100 L’Aquila, Italy; (R.D.); (C.E.); (B.F.); (M.D.G.)
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12
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Boukaew S, Cheirsilp B, Yossan S, Khunjan U, Petlamul W, Prasertsan P. Utilization of palm oil mill effluent as a novel substrate for the production of antifungal compounds by Streptomyces philanthi RM-1-138 and evaluation of its efficacy in suppression of three strains of oil palm pathogen. J Appl Microbiol 2021; 132:1990-2003. [PMID: 34564911 DOI: 10.1111/jam.15304] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Revised: 08/10/2021] [Accepted: 09/13/2021] [Indexed: 11/27/2022]
Abstract
AIMS This study aimed to use palm oil mill effluent (POME) as a renewable resource for the production of antifungal compounds by Streptomyces philanthi RM-1-138 against Ganoderma boninense, Ceratocystis paradoxa and Curvularia oryzae. METHODS AND RESULTS The efficacy of antifungal compounds RM-1-138 against the three strains of fungal oil palm pathogen was evaluated both in vitro and on oil palm leaf segments. In vitro studies using confrontation tests on glucose yeast-malt extract (GYM) agar plates indicated that the strain RM-1-138 inhibited the growth of all three fungal pathogenic strains. The antifungal compounds produced in the GYM medium exhibited significantly higher inhibition (79%-100%) against the three fungal pathogens than using the diluted POME (50%) medium (80%-83% inhibition). The optimum condition for the production of antifungal compounds from the strain RM-1-138 was as following: POME of 47,966 mg L-1 chemical oxygen demand (COD), the initial pH at 7.0 and supplemented with yeast extract (0.4%). Meanwhile, severe morphological and internal abnormalities in C. oryzae hyphae were observed under a scanning electron microscope and transmission electron microscope. In vivo experiment on oil palm leaf segments indicated that the efficacy of the antifungal compounds RM-1-138 (DSI = 1.3) were not significantly difference in the suppression of Curvularia leaf spot compared with the two commercial chemical fungicides of mancozeb® (DSI = 1.0) and tetraconazole® (DSI = 1.3). CONCLUSIONS Antifungal compounds produced by S. philanthi RM-1-138 grown in POME have the potential to inhibit fungal pathogens. SIGNIFICANCE AND IMPACT OF THE STUDY The POME (about 47 mg L-1 COD) with the initial pH of 7.0 and supplementation of 0.4% nitrogen could be used as a culture medium for the growth and production of antifungal compounds of S. philanthi RL-1-138. In addition, the antifungal compound RM-1-138 could suppress the three strains of oil palm fungal pathogen tested on oil palm leaf segment.
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Affiliation(s)
- Sawai Boukaew
- College of Innovation and Management, Songkhla Rajabhat University, Songkhla, Thailand
| | - Benjamas Cheirsilp
- International Program in Biotechnology, Center of Excellence in Innovative Biotechnology for Sustainable Utilization of Bioresources, Faculty of Agro-Industry, Prince of Songkla University, Hatyai, Thailand
| | - Siriporn Yossan
- Division of Environmental Science, Faculty of Liberal Arts and Science, Sisaket Rajabhat University, Sisaket, Thailand
| | - Uraiwan Khunjan
- Department of Science, Faculty of Science and Technology, Prince of Songkla University, Pattani, Thailand
| | - Wanida Petlamul
- College of Innovation and Management, Songkhla Rajabhat University, Songkhla, Thailand
| | - Poonsuk Prasertsan
- Research and Development Office, Prince of Songkla University, Songkhla, Thailand
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13
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Siupka P, Hansen FT, Schier A, Rocco S, Sørensen T, Piotrowska-Seget Z. Antifungal Activity and Biosynthetic Potential of New Streptomyces sp. MW-W600-10 Strain Isolated from Coal Mine Water. Int J Mol Sci 2021; 22:ijms22147441. [PMID: 34299061 PMCID: PMC8303363 DOI: 10.3390/ijms22147441] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Revised: 06/30/2021] [Accepted: 07/08/2021] [Indexed: 12/20/2022] Open
Abstract
Crop infections by fungi lead to severe losses in food production and pose risks for human health. The increasing resistance of pathogens to fungicides has led to the higher usage of these chemicals, which burdens the environment and highlights the need to find novel natural biocontrol agents. Members of the genus Streptomyces are known to produce a plethora of bioactive compounds. Recently, researchers have turned to extreme and previously unexplored niches in the search for new strains with antimicrobial activities. One such niche are underground coal mine environments. We isolated the new Streptomyces sp. MW-W600-10 strain from coal mine water samples collected at 665 m below ground level. We examined the antifungal activity of the strain against plant pathogens Fusarium culmorum DSM62188 and Nigrospora oryzae roseF7. Furthermore, we analyzed the strain’s biosynthetic potential with the antiSMASH tool. The strain showed inhibitory activity against both fungi strains. Genome mining revealed that it has 39 BGCs, among which 13 did not show similarity to those in databases. Additionally, we examined the activity of the Streptomyces sp. S-2 strain isolated from black soot against F. culmorum DSM62188. These results show that coal-related strains could be a source of novel bioactive compounds. Future studies will elucidate their full biotechnological potential.
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Affiliation(s)
- Piotr Siupka
- Faculty of Natural Sciences, Institute of Biology, Biotechnology and Environmental Protection, University of Silesia in Katowice, 40032 Katowice, Poland; (A.S.); (S.R.); (Z.P.-S.)
- Correspondence:
| | - Frederik Teilfeldt Hansen
- Faculty of Engineering and Science, Department of Chemistry and Biosciences, University of Aalborg, 9220 Aalborg, Denmark; (F.T.H.); (T.S.)
| | - Aleksandra Schier
- Faculty of Natural Sciences, Institute of Biology, Biotechnology and Environmental Protection, University of Silesia in Katowice, 40032 Katowice, Poland; (A.S.); (S.R.); (Z.P.-S.)
| | - Simone Rocco
- Faculty of Natural Sciences, Institute of Biology, Biotechnology and Environmental Protection, University of Silesia in Katowice, 40032 Katowice, Poland; (A.S.); (S.R.); (Z.P.-S.)
| | - Trine Sørensen
- Faculty of Engineering and Science, Department of Chemistry and Biosciences, University of Aalborg, 9220 Aalborg, Denmark; (F.T.H.); (T.S.)
| | - Zofia Piotrowska-Seget
- Faculty of Natural Sciences, Institute of Biology, Biotechnology and Environmental Protection, University of Silesia in Katowice, 40032 Katowice, Poland; (A.S.); (S.R.); (Z.P.-S.)
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Aallam Y, Maliki BE, Dhiba D, Lemriss S, Souiri A, Haddioui A, Tarkka M, Hamdali H. Multiple Potential Plant Growth Promotion Activities of Endemic Streptomyces spp. from Moroccan Sugar Beet Fields with Their Inhibitory Activities against Fusarium spp. Microorganisms 2021; 9:microorganisms9071429. [PMID: 34361865 PMCID: PMC8303843 DOI: 10.3390/microorganisms9071429] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Revised: 06/05/2021] [Accepted: 06/11/2021] [Indexed: 11/16/2022] Open
Abstract
The characterized 10 Streptomyces isolates were previously selected by their abilities to solubilize phosphates. To investigate whether these isolates represent multifaceted plant growth-promoting rhizobacteria (PGPR), their potassium-solubilizing, auxin-producing and inhibitory activities were determined. The 10 Streptomyces spp. yielded a variable biomass in the presence of insoluble orthoclase as the sole potassium (K) source, indicating that they were able to extract different amounts of K from this source for their own growth. Three strains (AZ, AYD and DE2) released soluble K from insoluble orthoclase in large amounts into the culture broth. The production levels ranged from 125.4 mg/L to 216.6 mg/L after 5 days of culture. Only two strains, Streptomyces enissocaesilis (BYC) and S. tunisiensis (AI), released a larger amount of soluble K from orthoclase and yielded much more biomass. This indicated that the rate of K released from this insoluble orthoclase exceeded its consumption rate for bacterial growth and that some strains solubilized K more efficiently than others. The results also suggest that the K solubilization process of AZ, AYD and DE2 strains, the most efficient K-solubilizing strains, involves a slight acidification of the medium. Furthermore, these 10 Streptomyces spp. were able to secrete indole acetic acid (IAA) in broth medium and ranged from 7.9 ± 0.1 µg/mL to 122.3 ± 0.1 µg/mL. The results of the antibiosis test proved the potential of the 10 tested strains to limit the growth of fungi and bacteria. In dual culture, S. bellus (AYD) had highest inhibitory effect against the three identified fungal causal agents of root rot of sugar beet: Fusarium equiseti and two F. fujikuroi at 55, 43 and 36%, respectively. Streptomyces enissocaesilis (BYC), S. bellus (AYD) and S. saprophyticus (DE2) exhibited higher multifaceted PGPR with their potassium-solubilizing, auxin-producing and inhibitory activities, which could be expected to lead to effectiveness in field trials of sugar beet.
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Affiliation(s)
- Yassine Aallam
- Laboratory of Biotechnology and Valorization of Plant Genetic Resources, Faculty of Sciences and Technology, University of Sultan Moulay Slimane, P.O. 523, Beni-Mellal 23000, Morocco; (Y.A.); (S.L.); (A.H.)
| | - Bouchra El Maliki
- Faculty of Medecine and Pharmacy, University Hassan II, Casablanca 20250, Morocco;
| | - Driss Dhiba
- International Water Research Institute (IWRI), Moulay Rachid, University Mohammed 6 Polytechnic (UM6P), Ben Guerir 43150, Morocco;
| | - Sanaa Lemriss
- Laboratory of Biotechnology and Valorization of Plant Genetic Resources, Faculty of Sciences and Technology, University of Sultan Moulay Slimane, P.O. 523, Beni-Mellal 23000, Morocco; (Y.A.); (S.L.); (A.H.)
- Laboratory of Research and Medical Analysis of Gendarmerie Royale, Department of Biosafety PCL3, Rabat 10090, Morocco;
| | - Amal Souiri
- Laboratory of Research and Medical Analysis of Gendarmerie Royale, Department of Biosafety PCL3, Rabat 10090, Morocco;
| | - Abdelmajid Haddioui
- Laboratory of Biotechnology and Valorization of Plant Genetic Resources, Faculty of Sciences and Technology, University of Sultan Moulay Slimane, P.O. 523, Beni-Mellal 23000, Morocco; (Y.A.); (S.L.); (A.H.)
| | - Mika Tarkka
- UFZ—Helmholtz-Centre for Environmental Research, Soil Ecology Department, Theodor-Lieser-Straße 4, 06120 Halle, Germany;
| | - Hanane Hamdali
- Laboratory of Biotechnology and Valorization of Plant Genetic Resources, Faculty of Sciences and Technology, University of Sultan Moulay Slimane, P.O. 523, Beni-Mellal 23000, Morocco; (Y.A.); (S.L.); (A.H.)
- Correspondence: ; Tel.: +212-523485112; Fax: +212-523485201
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Berg G, Kusstatscher P, Abdelfattah A, Cernava T, Smalla K. Microbiome Modulation-Toward a Better Understanding of Plant Microbiome Response to Microbial Inoculants. Front Microbiol 2021; 12:650610. [PMID: 33897663 PMCID: PMC8060476 DOI: 10.3389/fmicb.2021.650610] [Citation(s) in RCA: 53] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Accepted: 03/19/2021] [Indexed: 12/31/2022] Open
Abstract
Plant-associated microorganisms are involved in important functions related to growth, performance and health of their hosts. Understanding their modes of action is important for the design of promising microbial inoculants for sustainable agriculture. Plant-associated microorganisms are able to interact with their hosts and often exert specific functions toward potential pathogens; the underlying in vitro interactions are well studied. In contrast, in situ effects of inoculants, and especially their impact on the plant indigenous microbiome was mostly neglected so far. Recently, microbiome research has revolutionized our understanding of plants as coevolved holobionts but also of indigenous microbiome-inoculant interactions. Here we disentangle the effects of microbial inoculants on the indigenous plant microbiome and point out the following types of plant microbiome modulations: (i) transient microbiome shifts, (ii) stabilization or increase of microbial diversity, (iii) stabilization or increase of plant microbiome evenness, (iv) restoration of a dysbiosis/compensation or reduction of a pathogen-induced shift, (v) targeted shifts toward plant beneficial members of the indigenous microbiota, and (vi) suppression of potential pathogens. Therefore, we suggest microbiome modulations as novel and efficient mode of action for microbial inoculants that can also be mediated via the plant.
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Affiliation(s)
- Gabriele Berg
- Institute of Environmental Biotechnology, Graz University of Technology, Graz, Austria
| | - Peter Kusstatscher
- Institute of Environmental Biotechnology, Graz University of Technology, Graz, Austria
| | - Ahmed Abdelfattah
- Institute of Environmental Biotechnology, Graz University of Technology, Graz, Austria
| | - Tomislav Cernava
- Institute of Environmental Biotechnology, Graz University of Technology, Graz, Austria
| | - Kornelia Smalla
- Julius Kühn Institute (JKI) Federal Research Centre for Cultivated Plants, Institute for Epidemiology and Pathogen Diagnostics, Braunschweig, Germany
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Cell-Free Supernatants of Plant Growth-Promoting Bacteria: A Review of Their Use as Biostimulant and Microbial Biocontrol Agents in Sustainable Agriculture. SUSTAINABILITY 2020. [DOI: 10.3390/su12239917] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Plant growth-promoting bacteria (PGPB) afford plants several advantages (i.e., improvement of nutrient acquisition, growth, and development; induction of abiotic and biotic stress tolerance). Numerous PGPB strains have been isolated and studied over the years. However, only a few of them are available on the market, mainly due to the failed bacterial survival within the formulations and after application inside agroecosystems. PGPB strains with these challenging limitations can be used for the formulation of cell-free supernatants (CFSs), broth cultures processed through several mechanical and physical processes for cell removal. In the scientific literature there are diverse reviews and updates on PGPB in agriculture. However, no review deals with CFSs and the CFS metabolites obtainable by PGPB. The main objective of this review is to provide useful information for future research on CFSs as biostimulant and biocontrol agents in sustainable agriculture. Studies on CFS agricultural applications, both for biostimulant and biocontrol applications, have been reviewed, presenting limitations and advantages. Among the 109 articles selected and examined, the Bacillus genus seems to be the most promising due to the numerous articles that support its biostimulant and biocontrol potentialities. The present review underlines that research about this topic needs to be encouraged; evidence so far obtained has demonstrated that PGPB could be a valid source of secondary metabolites useful in sustainable agriculture.
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