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Kaur T, Khanna K, Sharma S, Manhas RK. Mechanistic insights into the role of actinobacteria as potential biocontrol candidates against fungal phytopathogens. J Basic Microbiol 2023; 63:1196-1218. [PMID: 37208796 DOI: 10.1002/jobm.202300027] [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: 01/18/2023] [Revised: 03/26/2023] [Accepted: 04/29/2023] [Indexed: 05/21/2023]
Abstract
Worldwide mounting demand for better food production to nurture exasperating population emphasizes on reduced crop losses. The incidence of pathogens into the agricultural fields has tend to dwindle plethora of cereal, vegetable, and other fodder crops. This, in turn, has seriously impacted the economic losses on global scale. Apart from this, it is quite challenging to feed the posterity in the coming decades. To counteract this problem, various agrochemicals have been commercialized in the market that no doubt shows positive results but along with adversely affecting the ecosystem. Therefore, the excessive ill-fated use of agrochemicals to combat the plant pests and diseases highlights that alternatives to chemical pesticides are need of the hour. In recent days, management of plant diseases using plant-beneficial microbes is gaining interest as safer and potent alternatives to replace chemically based pesticides. Among these beneficial microbes, actinobacteria especially streptomycetes play considerable role in combating plant diseases along with promoting the plant growth and development along with their productivity and yield. The mechanisms exhibited by actinobacteria include antibiosis (antimicrobial compounds and hydrolytic enzymes), mycoparasitism, nutrient competition, and induction of resistance in plants. Thus, in cognizance with potential of actinobacteria as potent biocontrol agents, this review summarizes role of actinobacteria and the multifarious mechanisms exhibited by actinobacteria for commercial applications.
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Affiliation(s)
- Talwinder Kaur
- Department of Microbiology, DAV University, Jalandhar, Punjab, India
- Department of Microbiology, Guru Nanak Dev University, Amritsar, Punjab, India
| | - Kanika Khanna
- Department of Microbiology, DAV University, Jalandhar, Punjab, India
| | - Sonika Sharma
- Faculty of Agricultural Sciences, Jalandhar, Punjab, India
| | - Rajesh K Manhas
- Department of Microbiology, Guru Nanak Dev University, Amritsar, Punjab, India
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Dow L, Gallart M, Ramarajan M, Law SR, Thatcher LF. Streptomyces and their specialised metabolites for phytopathogen control - comparative in vitro and in planta metabolic approaches. FRONTIERS IN PLANT SCIENCE 2023; 14:1151912. [PMID: 37389291 PMCID: PMC10301723 DOI: 10.3389/fpls.2023.1151912] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Accepted: 05/30/2023] [Indexed: 07/01/2023]
Abstract
In the search for new crop protection microbial biocontrol agents, isolates from the genus Streptomyces are commonly found with promising attributes. Streptomyces are natural soil dwellers and have evolved as plant symbionts producing specialised metabolites with antibiotic and antifungal activities. Streptomyces biocontrol strains can effectively suppress plant pathogens via direct antimicrobial activity, but also induce plant resistance through indirect biosynthetic pathways. The investigation of factors stimulating the production and release of Streptomyces bioactive compounds is commonly conducted in vitro, between Streptomyces sp. and a plant pathogen. However, recent research is starting to shed light on the behaviour of these biocontrol agents in planta, where the biotic and abiotic conditions share little similarity to those of controlled laboratory conditions. With a focus on specialised metabolites, this review details (i) the various methods by which Streptomyces biocontrol agents employ specialised metabolites as an additional line of defence against plant pathogens, (ii) the signals shared in the tripartite system of plant, pathogen and biocontrol agent, and (iii) an outlook on new approaches to expedite the identification and ecological understanding of these metabolites under a crop protection lens.
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Affiliation(s)
- Lachlan Dow
- Commonwealth Scientific and Industrial Research Organisation (CSIRO) Agriculture and Food, Acton, ACT, Australia
- Commonwealth Scientific and Industrial Research Organisation (CSIRO) Microbiomes for One Systems Health Future Science Platform, Acton, ACT, Australia
| | - Marta Gallart
- Commonwealth Scientific and Industrial Research Organisation (CSIRO) Agriculture and Food, Acton, ACT, Australia
- Commonwealth Scientific and Industrial Research Organisation (CSIRO) Advanced Engineering Biology Future Science Platform, Acton, ACT, Australia
| | - Margaret Ramarajan
- Commonwealth Scientific and Industrial Research Organisation (CSIRO) Agriculture and Food, Acton, ACT, Australia
| | - Simon R. Law
- Commonwealth Scientific and Industrial Research Organisation (CSIRO) Agriculture and Food, Acton, ACT, Australia
- Commonwealth Scientific and Industrial Research Organisation (CSIRO) Microbiomes for One Systems Health Future Science Platform, Acton, ACT, Australia
| | - Louise F. Thatcher
- Commonwealth Scientific and Industrial Research Organisation (CSIRO) Agriculture and Food, Acton, ACT, Australia
- Commonwealth Scientific and Industrial Research Organisation (CSIRO) Microbiomes for One Systems Health Future Science Platform, Acton, ACT, Australia
- Commonwealth Scientific and Industrial Research Organisation (CSIRO) Advanced Engineering Biology Future Science Platform, Acton, ACT, Australia
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Zhang XY, Li C, Hao JJ, Li YC, Li DZ, Zhang DM, Xing X, Liang Y. A Novel Streptomyces sp. Strain PBSH9 for Controlling Potato Common Scab Caused by Streptomyces galilaeus. PLANT DISEASE 2020; 104:1986-1993. [PMID: 32441579 DOI: 10.1094/pdis-07-19-1469-re] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Potato common scab is an important soilborne disease worldwide that can significantly reduce the quality and economic values of potato. The disease is caused by multiple species of Streptomyces, which are not well controlled due to lack of effective strategies. Streptomyces galilaeus has been recently identified as a dominant species causing potato common scab in Inner Mongolia, China. This study was focused on screening and characterizing antagonists for biological control against pathogenic S. galilaeus. Bacterial strain PBSH9 was isolated from a potato tuber. PBSH9 was identified as a Streptomyces sp. on the basis of morphological, physiological, and biochemical characteristics, as well as DNA sequence analysis. PBSH9 inhibited S. galilaeus with a diameter of inhibitory zone of 19.8 mm on agar plates. The extracellular filtrate of PBSH9 also inhibited S. galilaeus growth with a diameter of inhibition zone of 10.0 mm. Furthermore, PBSH9 promoted potato sprouting and emergence. Disease control was up to 81.88% in greenhouse trials, and from 47.64 to 73.97% in 3-year field trials. Among the tested inoculation methods, seed treatment was more effective than soil drenching for PBSH9 application. PBSH9 not only effectively controlled potato common scab but also increased potato growth. Thus, it can be a potential candidate for biocontrol agent.
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Affiliation(s)
- Xiao-Yu Zhang
- College of Horticulture and Plant Protection, Inner Mongolia Agricultural University, Hohhot 010019, China
| | - Chi Li
- College of Horticulture and Plant Protection, Inner Mongolia Agricultural University, Hohhot 010019, China
| | - Jian-Jun Hao
- School of Food and Agriculture, University of Maine, Orono, ME 04469, U.S.A
| | - Yu-Chen Li
- College of Horticulture and Plant Protection, Inner Mongolia Agricultural University, Hohhot 010019, China
| | - De-Zhou Li
- College of Horticulture and Plant Protection, Inner Mongolia Agricultural University, Hohhot 010019, China
- Development Planning Office, Inner Mongolia Agricultural University, Hohhot 010018, China
| | - Dong-Mei Zhang
- College of Horticulture and Plant Protection, Inner Mongolia Agricultural University, Hohhot 010019, China
| | - Xing Xing
- College of Horticulture and Plant Protection, Inner Mongolia Agricultural University, Hohhot 010019, China
| | - Yan Liang
- College of Horticulture and Plant Protection, Inner Mongolia Agricultural University, Hohhot 010019, China
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Shen G, Zhang S, Liu X, Jiang Q, Ding W. Soil acidification amendments change the rhizosphere bacterial community of tobacco in a bacterial wilt affected field. Appl Microbiol Biotechnol 2018; 102:9781-9791. [PMID: 30302520 PMCID: PMC6208964 DOI: 10.1007/s00253-018-9347-0] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2018] [Revised: 08/03/2018] [Accepted: 08/22/2018] [Indexed: 11/01/2022]
Abstract
Application of soil amendments has been wildly used to increase soil pH and control bacterial wilt. However, little is known about causal shifts in the rhizosphere microbial community of crops, especially when the field naturally harbors the disease of bacterial wilt to tobacco for many years due to long-term continuous cropping and soil acidification. In this study, biochar (CP), lime (LM), oyster shell powder (OS) and no soil amendment additions (Control; CK) were assessed for their abilities to improve the soil acidification, change the composition of rhizosphere soil bacterial communities and thus control tobacco bacterial wilt. The results showed that oyster shell powder significantly increased soil pH by 0.77 and reduced the incidence of tobacco bacterial wilt by 36.67% compared to the control. The Illumina sequencing -based community analysis showed that soil amendment applications affected the composition of rhizosphere bacterial community and increased the richness and diversity. In contrast, the richness and diversity correlated negatively to disease incidence. Using LEfSe analyses, 11 taxa were found to be closely related with disease suppression, in which Saccharibacteria, Aeromicrobium, and Pseudoxanthomonas could be potential indicators of disease suppression. Our results suggested that the suppression of bacterial wilt after the application of soil amendments (especially oyster shell powder) was attributed to the improved soil pH and increased bacterial richness and diversity.
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Affiliation(s)
- Guihua Shen
- Laboratory of Natural Products Pesticides, Plant Protection College of Southwest University, Chongqing, 400715, China
| | - Shuting Zhang
- Laboratory of Natural Products Pesticides, Plant Protection College of Southwest University, Chongqing, 400715, China
| | - Xiaojiao Liu
- Laboratory of Natural Products Pesticides, Plant Protection College of Southwest University, Chongqing, 400715, China
| | - Qipeng Jiang
- Laboratory of Natural Products Pesticides, Plant Protection College of Southwest University, Chongqing, 400715, China
| | - Wei Ding
- Laboratory of Natural Products Pesticides, Plant Protection College of Southwest University, Chongqing, 400715, China.
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Boudjeko T, Tchinda RAM, Zitouni M, Nana JAVT, Lerat S, Beaulieu C. Streptomyces cameroonensis sp. nov., a Geldanamycin Producer That Promotes Theobroma cacao Growth. Microbes Environ 2017; 32:24-31. [PMID: 28260703 PMCID: PMC5371071 DOI: 10.1264/jsme2.me16095] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The taxonomy of an actinobacterial strain, designated JJY4T, was established using a polyphasic approach. JJY4T was isolated from the rhizosphere of Chromolaena odorata in Yaoundé (Cameroon) during a project for the selection of biological control agents. Strain JJY4T exhibited antimicrobial activities against bacteria, fungi, and oomycetes. Strain JJY4T also exhibited the traits of plant growth-promoting rhizobacteria such as the solubilization of inorganic phosphate, production of siderophores and indole-3-acetic acid, and 1-aminocyclopropane-1-carboxylate deaminase activity. In planta assays performed on cocoa plantlets confirmed that strain JJY4T exhibited strong abilities to promote plant growth and protect against Phytophthora megakarya, the main causal agent of cocoa pod rot. The formation of rugose-ornamented spores in spiral spore chains by strain JJY4T is a typical feature of members found in the Streptomyces violaceusniger clade and, similar to some members of the clade, strain JJY4T produces geldanamycin. A phylogenetic analysis based on 16S rRNA gene sequences confirmed this classification and suggests that strain JJY4T be added to the subclade constituted of the type strains Streptomyces malaysiensis DSM 41697T and Streptomyces samsunensis DSM 42010T. However, DNA-DNA relatedness and physiological characteristics allowed for the differentiation of strain JJY4T from its closest phylogenetic relatives. Based on these results, strain JJY4T (=NRRL B-65369, =NBRC 112705) appears to represent a novel species in the S. violaceusniger clade for which the proposed name is Streptomyces cameroonensis sp. nov.
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Affiliation(s)
- Thaddée Boudjeko
- Laboratory of Phytoprotection and Valorization of Plants Resources, Biotechnology Centre-Nkolbisson
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Hiltunen LH, Kelloniemi J, Valkonen JPT. Repeated Applications of a Nonpathogenic Streptomyces Strain Enhance Development of Suppressiveness to Potato Common Scab. PLANT DISEASE 2017; 101:224-232. [PMID: 30682304 DOI: 10.1094/pdis-07-16-1020-re] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Potato common scab caused by several Streptomyces spp. is an important disease with no effective methods of control. Suppressiveness against common scab can develop in soil as a result of long-term potato monoculture and has been associated with nonpathogenic Streptomyces spp. To determine whether the development of scab suppressiveness could be enhanced, the effect of repeated applications of an antagonistic Streptomyces strain on common scab was investigated in a long-term field trial over 5 years. Streptomyces strain 272 applied annually at planting consistently suppressed development of common scab symptoms. On scab-susceptible potato cultivar Bintje, strain 272 reduced disease severity, on average, by 43%; whereas, on the scab-tolerant Nicola, the strain reduced both disease incidence and severity by 43 and 59%, respectively. Regardless of disease pressure, the combined use of strain 272 and the tolerant cultivar reduced the scab coverage to a negligible level. After a single application of strain 272, efficient disease suppression did not persist in the soil to the following growing season. However, when strain 272 was applied in three or more consecutive years, the soil remained suppressive to scab for at least 2 years beyond the last application, suggesting that, with repeated applications, it may be possible to enhance development of scab suppression in soil.
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Affiliation(s)
- Lea H Hiltunen
- Natural Resources Institute Finland (Luke), 90014 University of Oulu, Finland
| | - Jani Kelloniemi
- Natural Resources Institute Finland (Luke), 90014 University of Oulu, Finland
| | - Jari P T Valkonen
- Department of Agriculture Sciences, 00014 University of Helsinki, Finland
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Chen X, Pizzatti C, Bonaldi M, Saracchi M, Erlacher A, Kunova A, Berg G, Cortesi P. Biological Control of Lettuce Drop and Host Plant Colonization by Rhizospheric and Endophytic Streptomycetes. Front Microbiol 2016; 7:714. [PMID: 27242735 PMCID: PMC4874062 DOI: 10.3389/fmicb.2016.00714] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Accepted: 04/29/2016] [Indexed: 12/17/2022] Open
Abstract
Lettuce drop, caused by the soil borne pathogen Sclerotinia sclerotiorum, is one of the most common and serious diseases of lettuce worldwide. Increased concerns about the side effects of chemical pesticides have resulted in greater interest in developing biocontrol strategies against S. sclerotiorum. However, relatively little is known about the mechanisms of Streptomyces spp. as biological control agents against S. sclerotiorum on lettuce. Two Streptomyces isolates, S. exfoliatus FT05W and S. cyaneus ZEA17I, inhibit mycelial growth of Sclerotinia sclerotiorum by more than 75% in vitro. We evaluated their biocontrol activity against S. sclerotiorum in vivo, and compared them to Streptomyces lydicus WYEC 108, isolated from Actinovate®. When Streptomyces spp. (10(6) CFU/mL) were applied to S. sclerotiorum inoculated substrate in a growth chamber 1 week prior lettuce sowing, they significantly reduced the risk of lettuce drop disease, compared to the inoculated control. Interestingly, under field conditions, S. exfoliatus FT05W and S. cyaneus ZEA17I protected lettuce from drop by 40 and 10% respectively, whereas S. lydicus WYEC 108 did not show any protection. We further labeled S. exfoliatus FT05W and S. cyaneus ZEA17I with the enhanced GFP (EGFP) marker to investigate their rhizosphere competence and ability to colonize lettuce roots using confocal laser scanning microscopy (CLSM). The abundant colonization of young lettuce seedlings by both strains demonstrated Streptomyces' capability to interact with the host from early stages of seed germination and root development. Moreover, the two strains were detected also on 2-week-old roots, indicating their potential of long-term interactions with lettuce. Additionally, scanning electron microscopy (SEM) observations showed EGFP-S. exfoliatus FT05W endophytic colonization of lettuce root cortex tissues. Finally, we determined its viability and persistence in the rhizosphere and endorhiza up to 3 weeks by quantifying its concentration in these compartments. Based on these results we conclude that S. exfoliatus FT05W has high potential to be exploited in agriculture for managing soil borne diseases barely controlled by available plant protection products.
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Affiliation(s)
- Xiaoyulong Chen
- Department of Food, Environmental and Nutritional Sciences, University of MilanMilan, Italy
| | - Cristina Pizzatti
- Department of Food, Environmental and Nutritional Sciences, University of MilanMilan, Italy
| | - Maria Bonaldi
- Department of Food, Environmental and Nutritional Sciences, University of MilanMilan, Italy
| | - Marco Saracchi
- Department of Food, Environmental and Nutritional Sciences, University of MilanMilan, Italy
| | - Armin Erlacher
- Institute of Environmental Biotechnology, Graz University of TechnologyGraz, Austria
| | - Andrea Kunova
- Department of Food, Environmental and Nutritional Sciences, University of MilanMilan, Italy
| | - Gabriele Berg
- Institute of Environmental Biotechnology, Graz University of TechnologyGraz, Austria
| | - Paolo Cortesi
- Department of Food, Environmental and Nutritional Sciences, University of MilanMilan, Italy
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Tchinda RAM, Boudjeko T, Simao-Beaunoir AM, Lerat S, Tsala É, Monga E, Beaulieu C. Morphological, Physiological, and Taxonomic Characterization of Actinobacterial Isolates Living as Endophytes of Cacao Pods and Cacao Seeds. Microbes Environ 2016; 31:56-62. [PMID: 26947442 PMCID: PMC4791117 DOI: 10.1264/jsme2.me15146] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2015] [Accepted: 12/30/2015] [Indexed: 11/24/2022] Open
Abstract
Vascular plants are commonly colonized by endophytic actinobacteria. However, very little is known about the relationship between these microorganisms and cacao fruits. In order to determine the physiological and taxonomic relationships between the members of this community, actinobacteria were isolated from cacao fruits and seeds. Among the 49 isolates recovered, 11 morphologically distinct isolates were selected for further characterization. Sequencing of the 16S rRNA gene allowed the partition of the selected isolates into three phylogenetic clades. Most of the selected endophytic isolates belonged to the Streptomyces violaceusniger clade. Physiological characterization was carried out and a similarity index was used to cluster the isolates. However, clustering based on physiological properties did not match phylogenetic lineages. Isolates were also characterized for traits commonly associated with plant growth-promoting bacteria, including antibiosis and auxin biosynthesis. All isolates exhibited resistance to geldanamycin, whereas only two isolates were shown to produce this antibiotic. Endophytes were inoculated on radish seedlings and most isolates were found to possess plant growth-promoting abilities. These endophytic actinobacteria inhibited the growth of various plant pathogenic fungi and/or bacteria. The present study showed that S. violaceusniger clade members represent a significant part of the actinobacterial community living as endophytes in cacao fruits and seeds. While several members of this clade are known to be geldanamycin producers and efficient biocontrol agents of plant diseases, we herein established the endophytic lifestyle of some of these microorganisms, demonstrating their potential as plant health agents.
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Affiliation(s)
- Romaric Armel Mouafo Tchinda
- Laboratory of Phytoprotection and Valorization of Plants Resources, Biotechnology Centre—NkolbissonP.O. box 3851, Messa, YaoundéCameroon
- Centre SÈVE, Département de biologie, Université de SherbrookeSherbrooke, Québec J1K 2R1Canada
| | - Thaddée Boudjeko
- Laboratory of Phytoprotection and Valorization of Plants Resources, Biotechnology Centre—NkolbissonP.O. box 3851, Messa, YaoundéCameroon
- Department of Biochemistry, Faculty of Science, University of Yaoundé IP.O. box 812 YaoundéCameroon
| | | | - Sylvain Lerat
- Centre SÈVE, Département de biologie, Université de SherbrookeSherbrooke, Québec J1K 2R1Canada
| | - Éric Tsala
- Département de Mathématiques, Université de SherbrookeSherbrooke, Québec J1K 2R1Canada
| | - Ernest Monga
- Département de Mathématiques, Université de SherbrookeSherbrooke, Québec J1K 2R1Canada
| | - Carole Beaulieu
- Centre SÈVE, Département de biologie, Université de SherbrookeSherbrooke, Québec J1K 2R1Canada
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El-Kawokgy TMA, Hussein HA, Aly NAH, Mohamed SAH. Highly toxic and broad-spectrum insecticidal local Bacillus strains engineered using protoplast fusion. Can J Microbiol 2014; 61:38-47. [PMID: 25485592 DOI: 10.1139/cjm-2014-0532] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Protoplast fusion was performed between a local Bacillus thuringiensis UV-resistant mutant 66/1a (Bt) and Bacillus sphaericus GHAI (Bs) to produce new Bacillus strains with a wider spectrum of action against different insects. Bt is characterized as sensitive to polymyxin and streptomycin and resistant to rifampicin and has shown 87% mortality against Spodoptera littoralis larvae at concentration of 1.5 × 10(7) cells/mL after 7 days of feeding; Bs is characterized as resistant to polymyxin and streptomycin and sensitive to rifampicin and has been shown to have 100% mortality against Culex pipiens after 1 day of feeding at the same concentration as that of Bt. Among a total of 64 Bt::Bs fusants produced on the selective medium containing polymyxin, streptomycin, and rifampicin, 17 fusants were selected because of their high mortality percentages against S. littoralis (Lepidoptera) and C. pipiens (Diptera). While Bt harboured 3 plasmids (600, 350, and 173 bp) and Bs had 2 plasmids (544 and 291 bp), all the selected fusants acquired plasmids from both parental strains. SDS-PAGE protein analysis of the 17 selected fusants and their parental strains confirmed that all fusant strains acquired and expressed many specific protein bands from the 2 parental strains, especially the larvicidal proteins to both lepidopteran and dipteran species with molecular masses of 65, 70, 80, 88, 100, and 135 kDa. Four protein bands with high molecular masses of 281, 263, 220, and 190 kDa, which existed in the Bt parental strain and did not exist in the Bs parental strain, and 2 other protein bands with high molecular masses of 185 and 180 kDa, which existed in the Bs parental strain and did not exist in the Bt parental strain, were expressed in most fusants. The results indicated the expression of some cry genes encoded for insecticidal crystal proteins from Bt and the binary toxin genes from Bs in all fusant strains. The recombinant fusants have more efficient and potential values for agricultural application compared with both the insecticidal Bt and the mosquitocidal Bs strains alone against S. littoralis and C. pipiens larvae, respectively.
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10
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Effects of actinobacteria on plant disease suppression and growth promotion. Appl Microbiol Biotechnol 2013; 97:9621-36. [DOI: 10.1007/s00253-013-5206-1] [Citation(s) in RCA: 176] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2013] [Revised: 08/18/2013] [Accepted: 08/20/2013] [Indexed: 10/26/2022]
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Clermont N, Lerat S, Beaulieu C. Genome shuffling enhances biocontrol abilities of Streptomyces strains against two potato pathogens. J Appl Microbiol 2011; 111:671-82. [DOI: 10.1111/j.1365-2672.2011.05078.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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12
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Hiltunen LH, Ojanperä T, Kortemaa H, Richter E, Lehtonen MJ, Valkonen JPT. Interactions and biocontrol of pathogenicStreptomycesstrains co-occurring in potato scab lesions. J Appl Microbiol 2009; 106:199-212. [PMID: 19054229 DOI: 10.1111/j.1365-2672.2008.03992.x] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- L H Hiltunen
- Department of Applied Biology, University of Helsinki, Helsinki, Finland
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13
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Skantar AM, Agama K, Meyer SLF, Carta LK, Vinyard BT. Effects of geldanamycin on hatching and juvenile motility in Caenorhabditis elegans and Heterodera glycines. J Chem Ecol 2005; 31:2481-91. [PMID: 16195856 DOI: 10.1007/s10886-005-7114-z] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2004] [Revised: 05/11/2005] [Accepted: 05/28/2005] [Indexed: 10/25/2022]
Abstract
Several Streptomyces species are known to produce metabolites that inhibit plant pathogens. One such compound is geldanamycin (GA), a benzoquinone ansamycin originally isolated from Streptomyces hygroscopicus. We examined the effect of geldanamycin on egg hatch and juvenile motility in Caenorhabditis elegans and in two populations of the plant-parasitic nematode Heterodera glycines. When C. elegans eggs were exposed to geldanamycin, both hatch and motility were reduced by GA doses between 2 and 50 microg/ml. The H. glycines inbred populations TN17 and TN18 exhibited low dose stimulation of hatch and motility, whereas levels occurring at higher GA doses were at or below control levels. These experiments represent the first demonstration of geldanamycin effects in C. elegans and H. glycines and suggest that the heat shock chaperone Hsp90, the known molecular target of geldanamycin, may be involved in nematode egg hatch and motility. This study also indicates that geldanamycin-producing strains of Streptomyces may be useful as biocontrol agents for nematodes.
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Jobin G, Grondin G, Couture G, Beaulieu C. Microscopic examination of chitosan-polyphosphate beads with entrapped spores of the biocontrol agent, Streptomyces melanosporofaciens EF-76. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2005; 11:154-165. [PMID: 15817145 DOI: 10.1017/s1431927605050142] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2003] [Indexed: 05/24/2023]
Abstract
Spores of the biocontrol agent, Streptomyces melanosporofaciens EF-76, were entrapped by complex coacervation in beads composed of a macromolecular complex (MC) of chitosan and polyphosphate. A proportion of spores entrapped in beads survived the entrapment procedure as shown by treating spores from chitosan beads with a dye allowing the differentiation of live and dead cells. The spore-loaded chitosan beads could be digested by a chitosanase, suggesting that, once introduced in soil, the beads would be degraded to release the biocontrol agent. Spore-loaded beads were examined by optical and scanning electron microscopy because the release of the biological agent depends on the spore distribution in the chitosan beads. The microscopic examination revealed that the beads had a porous surface and contained a network of inner microfibrils. Spores were entrapped in both the chitosan microfibrils and the bead lacuna.
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Affiliation(s)
- Guy Jobin
- Centre d'Etude et de Valorisation de la Diversité Microbienne, Département de Biologie, Faculté des Sciences, Université de Sherbrooke, 2500, boul. Universitété Sherbrooke, Québec J1K 2R1, Canada
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Jobin G, Couture G, Goyer C, Brzezinski R, Beaulieu C. Streptomycete spores entrapped in chitosan beads as a novel biocontrol tool against common scab of potato. Appl Microbiol Biotechnol 2004; 68:104-10. [PMID: 15614559 DOI: 10.1007/s00253-004-1843-8] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2004] [Revised: 10/22/2004] [Accepted: 11/11/2004] [Indexed: 11/30/2022]
Abstract
Spores of Streptomyces melanosporofaciens EF-76, an actinomycete that inhibits the growth of several plant pathogens, were incorporated in beads of chitosan and polyphosphate using the entrapment technique called complex coacervation. The degradation of spore-loaded beads was monitored by measuring the residual amount of chitosan in soil and by enumerating the S. melanosporofaciens population over time. After the introduction of spore-loaded chitosan beads into soil, the amount of chitosan in sterile soil remained at 1.550 mg/g throughout the first week and diminished to 0.101 mg/g after 7 weeks. Bead degradation proceeded faster in non-sterile soil but a progressive release of both chitosan oligomers and the antagonistic microbial agent was nevertheless observed. Application of these spore-loaded chitosan beads to seed potato tubers protected progeny tubers against common scab.
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Affiliation(s)
- Guy Jobin
- Département de Biologie, Centre d'étude et de Valorisation de la Diversité Microbienne, Faculté des Sciences, Université de Sherbrooke, Sherbrooke, Québec, Canada, J1K 2R1
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