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Vaccaro F, Passeri I, Ajijah N, Bettini P, Courty PE, Dębiec-Andrzejewska K, Joshi N, Kowalewska Ł, Stasiuk R, Musiałowski M, Pranaw K, Mengoni A. Genotype-by-genotype interkingdom cross-talk between symbiotic nitrogen fixing Sinorhizobium meliloti strains and Trichoderma species. Microbiol Res 2024; 285:127768. [PMID: 38820702 DOI: 10.1016/j.micres.2024.127768] [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: 02/08/2024] [Revised: 05/10/2024] [Accepted: 05/13/2024] [Indexed: 06/02/2024]
Abstract
In the understanding of the molecular interaction between plants and their microbiome, a key point is to identify simplified models of the microbiome including relevant bacterial and fungal partners which could also be effective in plant growth promotion. Here, as proof-of-concept, we aim to identify the possible molecular interactions between symbiotic nitrogen-fixing rhizobia and soil fungi (Trichoderma spp.), hence shed light on synergistic roles rhizospheric fungi could have in the biology of symbiotic nitrogen fixation bacteria. We selected 4 strains of the model rhizobium Sinorhizobium meliloti and 4 Trichoderma species (T. velutinum, T. tomentosum, T. gamsii and T. harzianum). In an experimental scheme of 4 ×4 strains x species combinations, we investigated the rhizobia physiological and transcriptomic responses elicited by fungal spent media, as well as spent media effects on rhizobia-host legume plant (alfalfa, Medicago sativa L.) symbiosis. Fungal spent media had large effects on rhizobia, specific for each fungal species and rhizobial strains combination, indicating a generalized rhizobia genotype x fungal genotype interaction, including synergistic, neutral and antagonistic effects on alfalfa symbiotic phenotypes. Differential expression of a high number of genes was shown in rhizobia strains with up to 25% of total genes differentially expressed upon treatment of cultures with fungal spent media. Percentages over total genes and type of genes differentially expressed changed according to both fungal species and rhizobial strain. To support the hypothesis of a relevant rhizobia genotype x fungal genotype interaction, a nested Likelihood Ratio Test indicated that the model considering the fungus-rhizobium interaction explained 23.4% of differentially expressed genes. Our results provide insights into molecular interactions involving nitrogen-fixing rhizobia and rhizospheric fungi, highlighting the panoply of genes and genotypic interactions (fungus, rhizobium, host plant) which may concur to plant symbiosis.
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Affiliation(s)
| | | | - Nur Ajijah
- Department of Environmental Microbiology and Biotechnology, Institute of Microbiology, Faculty of Biology, University of Warsaw, Poland
| | | | | | | | - Namrata Joshi
- Department of Environmental Microbiology and Biotechnology, Institute of Microbiology, Faculty of Biology, University of Warsaw, Poland
| | - Łucja Kowalewska
- Department of Plant Anatomy and Cytology, Institute of Plant Experimental Biology and Biotechnology, Faculty of Biology, University of Warsaw, Poland
| | - Robert Stasiuk
- Department of Geomicrobiology, Institute of Microbiology, Faculty of Biology, University of Warsaw, Poland
| | - Marcin Musiałowski
- Department of Geomicrobiology, Institute of Microbiology, Faculty of Biology, University of Warsaw, Poland
| | - Kumar Pranaw
- Department of Environmental Microbiology and Biotechnology, Institute of Microbiology, Faculty of Biology, University of Warsaw, Poland; School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, India
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Correa-Delgado R, Brito-López P, Jaizme Vega MC, Laich F. Biodiversity of Trichoderma species of healthy and Fusarium wilt-infected banana rhizosphere soils in Tenerife (Canary Islands, Spain). Front Microbiol 2024; 15:1376602. [PMID: 38800760 PMCID: PMC11122028 DOI: 10.3389/fmicb.2024.1376602] [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: 01/25/2024] [Accepted: 04/12/2024] [Indexed: 05/29/2024] Open
Abstract
Banana (Musa acuminata) is the most important crop in the Canary Islands (38.9% of the total cultivated area). The main pathogen affecting this crop is the soil fungal Fusarium oxysporum f. sp. cubense subtropical race 4 (Foc-STR4), for which there is no effective control method under field conditions. Therefore, the use of native biological control agents may be an effective and sustainable alternative. This study aims to: (i) investigate the diversity and distribution of Trichoderma species in the rhizosphere of different banana agroecosystems affected by Foc-STR4 in Tenerife (the island with the greatest bioclimatic diversity and cultivated area), (ii) develop and preserve a culture collection of native Trichoderma species, and (iii) evaluate the influence of soil chemical properties on the Trichoderma community. A total of 131 Trichoderma isolates were obtained from 84 soil samples collected from 14 farms located in different agroecosystems on the northern (cooler and wetter) and southern (warmer and drier) slopes of Tenerife. Ten Trichoderma species, including T. afroharzianum, T. asperellum, T. atrobrunneum, T. gamsii, T. guizhouense, T. hamatum, T. harzianum, T. hirsutum, T. longibrachiatum, and T. virens, and two putative novel species, named T. aff. harzianum and T. aff. hortense, were identified based on the tef1-α sequences. Trichoderma virens (35.89% relative abundance) and T. aff. harzianum (27.48%) were the most abundant and dominant species on both slopes, while other species were observed only on one slope (north or south). Biodiversity indices (Margalef, Shannon, Simpson, and Pielou) showed that species diversity and evenness were highest in the healthy soils of the northern slope. The Spearman analysis showed significant correlations between Trichoderma species and soil chemistry parameters (mainly with phosphorus and soil pH). To the best of our knowledge, six species are reported for the first time in the Canary Islands (T. afroharzianum, T. asperellum, T. atrobrunneum, T. guizhouense, T. hamatum, T. hirsutum) and in the rhizosphere of banana soils (T. afroharzianum, T. atrobrunneum, T. gamsii, T. guizhouense, T. hirsutum, T. virens). This study provides essential information on the diversity/distribution of native Trichoderma species for the benefit of future applications in the control of Foc-STR4.
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Affiliation(s)
| | | | | | - Federico Laich
- Unidad de Protección Vegetal, Instituto Canario de Investigaciones Agrarias, Valle de Guerra, Santa Cruz de Tenerife, Canary Islands, Spain
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Fei YC, Cheng Q, Zhang H, Han C, Wang X, Li YF, Li SQ, Zhao XH. Maleic acid and malonic acid reduced the pathogenicity of Sclerotinia sclerotiorum by inhibiting mycelial growth, sclerotia formation and virulence factors. STRESS BIOLOGY 2023; 3:45. [PMID: 37955738 PMCID: PMC10643788 DOI: 10.1007/s44154-023-00122-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Accepted: 09/07/2023] [Indexed: 11/14/2023]
Abstract
Sclerotinia sclerotiorum is a necrotrophic plant pathogenic fungus with broad distribution and host range. Bioactive compounds derived from plant extracts have been proven to be effective in controlling S. sclerotiorum. In this study, the mycelial growth of S. sclerotiorum was effectively inhibited by maleic acid, malonic acid, and their combination at a concentration of 2 mg/mL, with respective inhibition rates of 32.5%, 9.98%, and 67.6%. The treatment of detached leaves with the two acids resulted in a decrease in lesion diameters. Interestingly, maleic acid and malonic acid decreased the number of sclerotia while simultaneously increasing their weight. The two acids also disrupted the cell structure of sclerotia, leading to sheet-like electron-thin regions. On a molecular level, maleic acid reduced oxalic acid secretion, upregulated the expression of Ss-Odc2 and downregulated CWDE10, Ss-Bi1 and Ss-Ggt1. Differently, malonic acid downregulated CWDE2 and Ss-Odc1. These findings verified that maleic acid and malonic acid could effectively inhibit S. sclerotiorum, providing promising evidence for the development of an environmentally friendly biocontrol agent.
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Affiliation(s)
- Yu-Chen Fei
- State Key Laboratory of Agricultural Microbiology / College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China
- Fujian Universities and Colleges Engineering Research Center of Modern Facility Agriculture, Fuqing, 350300, China
| | - Qin Cheng
- State Key Laboratory of Agricultural Microbiology / College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China
| | - Huan Zhang
- State Key Laboratory of Agricultural Microbiology / College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China
| | - Chuang Han
- State Key Laboratory of Agricultural Microbiology / College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China
| | - Xu Wang
- Institute of Quality Standard and Monitoring Technology for Agro-Products of Guangdong Academy of Agricultural Sciences, Guangzhou, 510640, China
| | - Yan-Feng Li
- State Key Laboratory of Agricultural Microbiology / College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China
| | - Shi-Qian Li
- Fujian Universities and Colleges Engineering Research Center of Modern Facility Agriculture, Fuqing, 350300, China.
| | - Xiao-Hu Zhao
- State Key Laboratory of Agricultural Microbiology / College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China.
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McLaughlin MS, Roy M, Abbasi PA, Carisse O, Yurgel SN, Ali S. Why Do We Need Alternative Methods for Fungal Disease Management in Plants? PLANTS (BASEL, SWITZERLAND) 2023; 12:3822. [PMID: 38005718 PMCID: PMC10675458 DOI: 10.3390/plants12223822] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Revised: 11/03/2023] [Accepted: 11/07/2023] [Indexed: 11/26/2023]
Abstract
Fungal pathogens pose a major threat to food production worldwide. Traditionally, chemical fungicides have been the primary means of controlling these pathogens, but many of these fungicides have recently come under increased scrutiny due to their negative effects on the health of humans, animals, and the environment. Furthermore, the use of chemical fungicides can result in the development of resistance in populations of phytopathogenic fungi. Therefore, new environmentally friendly alternatives that provide adequate levels of disease control are needed to replace chemical fungicides-if not completely, then at least partially. A number of alternatives to conventional chemical fungicides have been developed, including plant defence elicitors (PDEs); biological control agents (fungi, bacteria, and mycoviruses), either alone or as consortia; biochemical fungicides; natural products; RNA interference (RNAi) methods; and resistance breeding. This article reviews the conventional and alternative methods available to manage fungal pathogens, discusses their strengths and weaknesses, and identifies potential areas for future research.
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Affiliation(s)
- Michael S. McLaughlin
- Agriculture and Agri-Food Canada, Kentville Research and Development Centre, Kentville, NS B4N 1J5, Canada; (M.S.M.); (M.R.); (P.A.A.)
- Department of Plant, Food and Environmental Sciences, Faculty of Agriculture, Dalhousie University, Truro, NS B2N 4H5, Canada
| | - Maria Roy
- Agriculture and Agri-Food Canada, Kentville Research and Development Centre, Kentville, NS B4N 1J5, Canada; (M.S.M.); (M.R.); (P.A.A.)
- Department of Biology, Acadia University, Wolfville, NS B4P 2R6, Canada
| | - Pervaiz A. Abbasi
- Agriculture and Agri-Food Canada, Kentville Research and Development Centre, Kentville, NS B4N 1J5, Canada; (M.S.M.); (M.R.); (P.A.A.)
| | - Odile Carisse
- Saint-Jean-sur-Richelieu Research Development Centre, Science and Technology Branch, Agriculture and Agri-Food Canada, Saint-Jean-sur-Richelieu, QC J3B 7B5, Canada;
| | - Svetlana N. Yurgel
- United States Department of Agriculture (USDA), Agricultural Research Service, Grain Legume Genetics and Physiology Research Unit, Prosser, WA 99350, USA;
| | - Shawkat Ali
- Agriculture and Agri-Food Canada, Kentville Research and Development Centre, Kentville, NS B4N 1J5, Canada; (M.S.M.); (M.R.); (P.A.A.)
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Xiao Z, Zhao Q, Li W, Gao L, Liu G. Strain improvement of Trichoderma harzianum for enhanced biocontrol capacity: Strategies and prospects. Front Microbiol 2023; 14:1146210. [PMID: 37125207 PMCID: PMC10134904 DOI: 10.3389/fmicb.2023.1146210] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Accepted: 03/20/2023] [Indexed: 05/02/2023] Open
Abstract
In the control of plant diseases, biocontrol has the advantages of being efficient and safe for human health and the environment. The filamentous fungus Trichoderma harzianum and its closely related species can inhibit the growth of many phytopathogenic fungi, and have been developed as commercial biocontrol agents for decades. In this review, we summarize studies on T. harzianum species complex from the perspective of strain improvement. To elevate the biocontrol ability, the production of extracellular proteins and compounds with antimicrobial or plant immunity-eliciting activities need to be enhanced. In addition, resistance to various environmental stressors should be strengthened. Engineering the gene regulatory system has the potential to modulate a variety of biological processes related to biocontrol. With the rapidly developing technologies for fungal genetic engineering, T. harzianum strains with increased biocontrol activities are expected to be constructed to promote the sustainable development of agriculture.
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Affiliation(s)
- Ziyang Xiao
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao, China
- Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao, China
| | - Qinqin Zhao
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao, China
| | - Wei Li
- Shanghai Tobacco Group Beijing Cigarette Factory Co., Ltd., Beijing, China
| | - Liwei Gao
- Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao, China
| | - Guodong Liu
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao, China
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Nagy VD, Zhumakayev A, Vörös M, Bordé Á, Szarvas A, Szűcs A, Kocsubé S, Jakab P, Monostori T, Škrbić BD, Mohai E, Hatvani L, Vágvölgyi C, Kredics L. Development of a Multicomponent Microbiological Soil Inoculant and Its Performance in Sweet Potato Cultivation. Microorganisms 2023; 11:microorganisms11040914. [PMID: 37110337 PMCID: PMC10143537 DOI: 10.3390/microorganisms11040914] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Revised: 03/27/2023] [Accepted: 03/29/2023] [Indexed: 04/03/2023] Open
Abstract
The cultivation and consumption of sweet potato (Ipomoea batatas) are increasing globally. As the usage of chemical fertilizers and pest control agents during its cultivation may lead to soil, water and air pollution, there is an emerging need for environment-friendly, biological solutions enabling increased amounts of healthy crop and efficient disease management. Microbiological agents for agricultural purposes gained increasing importance in the past few decades. Our goal was to develop an agricultural soil inoculant from multiple microorganisms and test its application potential in sweet potato cultivation. Two Trichoderma strains were selected: Trichoderma ghanense strain SZMC 25217 based on its extracellular enzyme activities for the biodegradation of plant residues, and Trichoderma afroharzianum strain SZMC 25231 for biocontrol purposes against fungal plant pathogens. The Bacillus velezensis strain SZMC 24986 proved to be the best growth inhibitor of most of the nine tested strains of fungal species known as plant pathogens, therefore it was also selected for biocontrol purposes against fungal plant pathogens. Arthrobacter globiformis strain SZMC 25081, showing the fastest growth on nitrogen-free medium, was selected as a component with possible nitrogen-fixing potential. A Pseudomonas resinovorans strain, SZMC 25872, was selected for its ability to produce indole-3-acetic acid, which is among the important traits of potential plant growth-promoting rhizobacteria (PGPR). A series of experiments were performed to test the selected strains for their tolerance to abiotic stress factors such as pH, temperature, water activity and fungicides, influencing the survivability in agricultural environments. The selected strains were used to treat sweet potato in two separate field experiments. Yield increase was observed for the plants treated with the selected microbial consortium (synthetic community) in comparison with the control group in both cases. Our results suggest that the developed microbial inoculant has the potential to be used in sweet potato plantations. To the best of our knowledge, this is the first report about the successful application of a fungal-bacterial consortium in sweet potato cultivation.
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Affiliation(s)
- Viktor Dávid Nagy
- Department of Microbiology, Faculty of Science and Informatics, University of Szeged, Közép fasor 52, 6726 Szeged, Hungary
| | - Anuar Zhumakayev
- Department of Microbiology, Faculty of Science and Informatics, University of Szeged, Közép fasor 52, 6726 Szeged, Hungary
| | - Mónika Vörös
- Department of Microbiology, Faculty of Science and Informatics, University of Szeged, Közép fasor 52, 6726 Szeged, Hungary
| | - Ádám Bordé
- Faculty of Agriculture, University of Szeged, Andrássy Street 15, 6800 Hódmezővásárhely, Hungary
| | - Adrienn Szarvas
- Faculty of Agriculture, University of Szeged, Andrássy Street 15, 6800 Hódmezővásárhely, Hungary
| | - Attila Szűcs
- Department of Microbiology, Faculty of Science and Informatics, University of Szeged, Közép fasor 52, 6726 Szeged, Hungary
| | - Sándor Kocsubé
- Department of Microbiology, Faculty of Science and Informatics, University of Szeged, Közép fasor 52, 6726 Szeged, Hungary
| | - Péter Jakab
- Faculty of Agriculture, University of Szeged, Andrássy Street 15, 6800 Hódmezővásárhely, Hungary
| | - Tamás Monostori
- Faculty of Agriculture, University of Szeged, Andrássy Street 15, 6800 Hódmezővásárhely, Hungary
| | - Biljana D. Škrbić
- Faculty of Technology, University of Novi Sad, Bulevar cara Lazara 1, 21000 Novi Sad, Serbia
| | - Edina Mohai
- Department of Microbiology, Faculty of Science and Informatics, University of Szeged, Közép fasor 52, 6726 Szeged, Hungary
| | - Lóránt Hatvani
- Department of Microbiology, Faculty of Science and Informatics, University of Szeged, Közép fasor 52, 6726 Szeged, Hungary
| | - Csaba Vágvölgyi
- Department of Microbiology, Faculty of Science and Informatics, University of Szeged, Közép fasor 52, 6726 Szeged, Hungary
| | - László Kredics
- Department of Microbiology, Faculty of Science and Informatics, University of Szeged, Közép fasor 52, 6726 Szeged, Hungary
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Martínez-Padrón HY, Herrera-Mayorga V, Paredes-Sánchez FA, Lara-Ramírez EE, Torres-Castillo JA, Rodríguez-Herrera R, López-Santillán JA, Osorio-Hernández E. In vitro evaluation of the antagonistic activity of native strains of Trichoderma spp. against Fusarium spp. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART. B, PESTICIDES, FOOD CONTAMINANTS, AND AGRICULTURAL WASTES 2023; 58:195-202. [PMID: 36896588 DOI: 10.1080/03601234.2023.2185014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Five samples of agricultural soil and five samples of Aloe barbadensis (P. Mill., 1768) plants with symptoms of wilt and root necrosis were collected in five localities of the state of Tamaulipas, México. The aims of this study were the morphological identification, molecular identification and in vitro evaluation of the antagonistic activity of Trichoderma spp. on Fusarium spp. Four strains of Trichoderma asperellum, one strain of Trichoderma harzianum and five strains of Fusarium oxysporum were identified by morphological and molecular methods. The evaluation of the antagonistic activity of T. harzianum isolate (TP) showed the highest inhibition in Fusarium spp. (78.80%). The evaluation of the antagonistic activity of Trichoderma spp. extracts in Fusarium spp. did not show significant differences between treatments (P ≤ 0.05), with Trichoderma growth percentages that oscillated between 81.08 and 94.38%. The native isolate of T. harzianum (TP) showed significant competitive capability against the mycelial growth of F. oxysporum. Trichoderma species are promising agents of biological control in the central area of the State Tamaulipas, Mexico.
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Affiliation(s)
- Hadassa Yuef Martínez-Padrón
- Subdirección de Enseñanza e Investigación, Hospital Regional de Alta Especialidad de Ciudad Victoria "Bicentenario, Tamaulipas, México
| | - Verónica Herrera-Mayorga
- Unidad Académica Multidisciplinaria Mante, Universidad Autónoma de Tamaulipas, Tamaulipas, México
| | | | | | | | - Raúl Rodríguez-Herrera
- Departamento de Investigación en Alimentos, Facultad de Química, Universidad Autónoma de Coahuila, Saltillo, México
| | - José Alberto López-Santillán
- División de Estudios de Posgrado e Investigación, Facultad de Ingeniería y Ciencias, Universidad Autónoma de Tamaulipas, Tamaulipas, México
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8
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Suaza-Gaviria V, Mesa-Vanegas AM, Ocampo-Jiménez O, Monsalve-Fonnegra ZI. Antioxidant Activity and Phytopathogenic Control of Extracts and Fraction from Struthanthus calophyllus A.C.Sm. (Loranthaceae). Chem Biodivers 2023; 20:e202200830. [PMID: 36650106 DOI: 10.1002/cbdv.202200830] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2022] [Revised: 01/11/2023] [Accepted: 01/16/2023] [Indexed: 01/19/2023]
Abstract
Phytopathogenic microorganisms cause oxidative stress in host plants, thus affecting agricultural crops. Such stress could be controlled by antioxidant compounds from parasitic plants, given their antioxidant power. This article reports an evaluation of Struthanthus calophyllus antimicrobial activity and antioxidant mechanism by testing different polarity extracts. Antimicrobial activity was evaluated against phytopathogens bacteria (e. g., Erwinia, Pectobacterium, Xanthomonas) using the agar diffusion method. Pectobacterium and Xanthomonas presented growth inhibition zones similar to streptomycin control. Antioxidant activity was determined by measuring total phenol content, DPPH⋅, and ABTS⋅+ radicals-scavenging inhibition percentage (IP). Most polar extracts presented 76,9-95,9 % IP, which correlates with its phenolic content. Besides, Nuclear Magnetic Resonance in a V14-1 sub-fraction from stem ethanolic extract, chose one for highest yield percentage, highest metabolites presence, and antimicrobial activity, showed triterpenic compounds mixture (α-amyrin, β-amyrin and 24-methylenecycloartanol). Findings in this study are among the first reports for S. calophyllus, even the chemical characterization, that confirm its strong antioxidant and antibacterial activities. Further molecular composition research about parasitic plants could show how unknown compounds may combat pathogenic microorganisms.
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Affiliation(s)
- Vanessa Suaza-Gaviria
- AgroBiotecnología Research Group, Instituto de Biología, Universidad de Antioquia, P.O. Box: 1226, Medellín, Colombia
| | - Ana María Mesa-Vanegas
- AgroBiotecnología Research Group, Instituto de Biología, Universidad de Antioquia, P.O. Box: 1226, Medellín, Colombia
| | - Omar Ocampo-Jiménez
- AgroBiotecnología Research Group, Instituto de Biología, Universidad de Antioquia, P.O. Box: 1226, Medellín, Colombia
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9
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Malik MS, Rehman A, Khan IU, Khan TA, Jamil M, Rha ES, Anees M. Thermo-neutrophilic cellulases and chitinases characterized from a novel putative antifungal biocontrol agent: Bacillus subtilis TD11. PLoS One 2023; 18:e0281102. [PMID: 36706132 PMCID: PMC9882894 DOI: 10.1371/journal.pone.0281102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Accepted: 01/16/2023] [Indexed: 01/28/2023] Open
Abstract
Cellulose and chitin are the most abundant naturally occurring biopolymers synthesized in plants and animals and are used for synthesis of different organic compounds and acids in the industry. Therefore, cellulases and chitinases are important for their multiple uses in industry and biotechnology. Moreover, chitinases have a role in the biological control of phytopathogens. A bacterial strain Bacillus subtilis TD11 was previously isolated and characterized as a putative biocontrol agent owing to its significant antifungal potential. In this study, cellulase and chitinase produced by the strain B. subtilis TD11 were purified and characterized. The activity of the cellulases and chitinases were optimized at different pH (2 to 10) and temperatures (20 to 90°C). The substrate specificity of cellulases was evaluated using different substances including carboxymethyl cellulose (CMC), hydroxyethyl cellulose (HEC), and crystalline substrates. The cellulase produced by B. subtilis TD11 had a molecular mass of 45 kDa while that of chitinase was 55 kDa. The optimal activities of the enzymes were found at neutral pH (6.0 to 7.0). The optimum temperature for the purified cellulases was in the range of 50 to 70°C while, purified chitinases were optimally active at 50°C. The highest substrate specificity of the purified cellulase was found for CMC (100%) followed by HEC (>50% activity) while no hydrolysis was observed against the crystalline substrates. Moreover, it was observed that the purified chitinase was inhibitory against the fungi containing chitin in their hyphal walls i.e., Rhizoctonia, Colletotrichum, Aspergillus and Fusarium having a dose-effect relationship.
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Affiliation(s)
- Muhammad Saqib Malik
- Department of Microbiology, Kohat University of Science and Technology, Kohat, Pakistan
| | - Abdul Rehman
- Department of Microbiology, Kohat University of Science and Technology, Kohat, Pakistan
| | - Irfan Ullah Khan
- Vaccine Development Group, Animal Sciences Division, Nuclear Institute for Agriculture and Biology, Faisalabad, Pakistan
| | - Taj Ali Khan
- Department of Microbiology, Khyber Medical University Peshawar, Khyber Pakhtunkhwa, Pakistan
| | - Muhammad Jamil
- Department of Biotechnology and Genetic Engineering, Kohat University of Science and Technology, Kohat, Pakistan
| | - Eui Shik Rha
- Department of Well-Being Resources, Sunchon National University, Suncheon, Republic of Korea
- * E-mail: (MA); (ESR)
| | - Muhammad Anees
- Department of Microbiology, Kohat University of Science and Technology, Kohat, Pakistan
- * E-mail: (MA); (ESR)
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10
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Wang Y, Zeng L, Wu J, Jiang H, Mei L. Diversity and effects of competitive Trichoderma species in Ganoderma lucidum-cultivated soils. Front Microbiol 2022; 13:1067822. [PMID: 36569077 PMCID: PMC9772278 DOI: 10.3389/fmicb.2022.1067822] [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: 10/14/2022] [Accepted: 11/25/2022] [Indexed: 12/12/2022] Open
Abstract
Ganoderma lucidum (GL) is a well-known medicinal mushroom that has been extensively cultivated. Our previous study has shown that abundant Trichoderma colonies grow on the casing soil surface, posing cultivation obstacles for GL. However, an understanding of species-level characteristics of Trichoderma strains and their adverse effects on GL growth is limited. This study aimed to investigate the diversity and potential effects of Trichoderma from GL-cultivated soils. Over 700 Trichoderma isolates were collected from two trails in Longquan Country, southeast China. Eight Trichoderma species, including T. atrioviride, T. guizhouense, T. hamatum, T. harzianum, T. koningiopsis, T. pleuroticola, T. sp. irale, and T. virens, were identified based on the combination alignment of tef-1α and rpb2 sequences. The number of Trichoderma colonies increased dramatically during GL cultivation, with an increase of 9.2-fold in the Lanju trail. T. virens accounted for the most colonies (33.33 and 32.50% in Lanju and Chengbei, respectively) at the end of GL cultivation. The Trichoderma species growth varied but was satisfactory under different temperature or pH conditions. Moreover, Trichoderma species showed different adverse effects on GL growth. The non-volatile metabolites from T. virens and volatile metabolites from T. atroviride displayed the strongest antagonistic activity. Furthermore, the volatile 6-pentyl-2H-pyran-2-one (6-PP) showed a significant inhibitory effect on GL growth with an 8.79 μl mL-1 headspace of 50% effective concentration. The different Trichoderma spp. produced different amounts of 6-PP. The most efficient 6-PP producer was T. atroviride. To the best of our knowledge, this study is the first to demonstrate the abundance of competitive Trichoderma species associated with GL cultivation. Our results would contribute to.
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Affiliation(s)
- Yongjun Wang
- Department of Forest Protection, College of Forestry and Biotechnology, Zhejiang A&F University, Hangzhou, China
| | - Linzhou Zeng
- Department of Forest Protection, College of Forestry and Biotechnology, Zhejiang A&F University, Hangzhou, China
| | - Jiayi Wu
- Department of Forest Protection, College of Forestry and Biotechnology, Zhejiang A&F University, Hangzhou, China
| | - Hong Jiang
- Department of Forest Protection, College of Forestry and Biotechnology, Zhejiang A&F University, Hangzhou, China
| | - Li Mei
- Department of Silviculture, College of Forestry and Biotechnology, Zhejiang A&F University, Hangzhou, China
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Shimizu M, Naznin HA, Hieno A. The Significance of Mycoparasitism by Streptomyces sp. MBCN152-1 for Its Biocontrol Activity against Alternaria brassicicola. Microbes Environ 2022; 37. [PMID: 36104185 PMCID: PMC9530718 DOI: 10.1264/jsme2.me22048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Streptomyces sp. strain MBCN152-1, isolated from cabbage, has potential as a biocontrol agent for Alternaria brassicicola on cabbage seedlings. The present study examined its mode of action. Light microscopy showed that appressorium formation by A. brassicicola was significantly suppressed on cabbage seedlings bacterized with MBCN152-1. Furthermore, scanning electron microscopy revealed that the mycelia of MBCN152-1, which were epiphytically growing on the cotyledon leaves of cabbage seedlings, intensively coiled around the germinating conidia of A. brassicicola. In vitro co-culture experiments demonstrated that MBCN152-1 is an aggressive mycoparasite of A. brassicicola, but not of A. brassicae or Colletotrichum higginsianum. Biocontrol experiments indicated that MBCN152-1 did not control diseases caused by A. brassicae or C. higginsianum. These results suggest that mycoparasitism is the primary mode of action for MBCN152-1. This is the first study to clearly demonstrate the significance of mycoparasitism in the biocontrol efficacy of endophytic Streptomyces.
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Affiliation(s)
- Masafumi Shimizu
- Laboratory of Plant Pathology, Faculty of Applied Biological Sciences, Gifu University
| | - Hushna Ara Naznin
- Laboratory of Plant Pathology, Faculty of Applied Biological Sciences, Gifu University
| | - Ayaka Hieno
- River Basin Research Center, Gifu University
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Tagg AS, Sperlea T, Labrenz M, Harrison JP, Ojeda JJ, Sapp M. Year-Long Microbial Succession on Microplastics in Wastewater: Chaotic Dynamics Outweigh Preferential Growth. Microorganisms 2022; 10:microorganisms10091775. [PMID: 36144377 PMCID: PMC9506493 DOI: 10.3390/microorganisms10091775] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Revised: 08/29/2022] [Accepted: 08/30/2022] [Indexed: 11/16/2022] Open
Abstract
Microplastics are a globally-ubiquitous aquatic pollutant and have been heavily studied over the last decade. Of particular interest are the interactions between microplastics and microorganisms, especially the pursuit to discover a plastic-specific biome, the so-called plastisphere. To follow this up, a year-long microcosm experimental setup was deployed to expose five different microplastic types (and silica beads control) to activated aerobic wastewater in controlled conditions, with microbial communities being measured four times over the course of the year using 16S rDNA (bacterial) and ITS (fungal) amplicon sequencing. The biofilm community shows no evidence of a specific plastisphere, even after a year of incubation. Indeed, the microbial communities (particularly bacterial) show a clear trend of increasing dissimilarity between plastic types as time increases. Despite little evidence for a plastic-specific community, there was a slight grouping observed for polyolefins (PE and PP) in 6–12-month biofilms. Additionally, an OTU assigned to the genus Devosia was identified on many plastics, increasing over time while showing no growth on silicate (natural particle) controls, suggesting this could be either a slow-growing plastic-specific taxon or a symbiont to such. Both substrate-associated findings were only possible to observe in samples incubated for 6–12 months, which highlights the importance of studying long-term microbial community dynamics on plastic surfaces.
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Affiliation(s)
- Alexander S. Tagg
- Leibniz-Institut für Ostseeforschung Warnemünde, Seestraße 15, 18119 Rostock, Germany
- Department of Chemical Engineering, Faculty of Science and Engineering, Swansea University, Swansea SA1 8EN, UK
- Correspondence:
| | - Theodor Sperlea
- Leibniz-Institut für Ostseeforschung Warnemünde, Seestraße 15, 18119 Rostock, Germany
| | - Matthias Labrenz
- Leibniz-Institut für Ostseeforschung Warnemünde, Seestraße 15, 18119 Rostock, Germany
| | - Jesse P. Harrison
- CSC—IT Center for Science Ltd., P.O. Box 405, FI-02101 Espoo, Finland
| | - Jesús J. Ojeda
- Department of Chemical Engineering, Faculty of Science and Engineering, Swansea University, Swansea SA1 8EN, UK
| | - Melanie Sapp
- Institute of Human Genetics, University Hospital Düsseldorf, Heinrich Heine University, Moorenstrasse 5, 40225 Düsseldorf, Germany
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Safari Motlagh MR, Jahangiri B, Kulus D, Tymoszuk A, Kaviani B. Endophytic Fungi as Potential Biocontrol Agents against Rhizoctonia solani J.G. Kühn, the Causal Agent of Rice Sheath Blight Disease. BIOLOGY 2022; 11:biology11091282. [PMID: 36138761 PMCID: PMC9495574 DOI: 10.3390/biology11091282] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Revised: 08/25/2022] [Accepted: 08/25/2022] [Indexed: 11/20/2022]
Abstract
Simple Summary Rice, together with wheat and corn, is among the most important food crops for mankind. Half of the world’s population consumes rice, mainly in Asia, southern Europe, tropical America, and parts of Africa. Rice sheath blight, caused by Rhizoctonia solani, is one of the main diseases in rice production. The control of this pathogen is difficult due to its ecological behavior, broad host range, and the high survival rate of sclerotia under various environmental conditions. In this research, after morphological and molecular identification of fungal isolates, five superior isolates, including Trichoderma virens, Trichoderma harzianum, Curvularia lunata, Aspergillus fumigatus, and Aspergillus awamori were studied in the in vitro and greenhouse trials, towards their potential to inhibit R. solani. The statistical analysis showed a significant difference between the effectiveness of fungi used in the volatile metabolites assay and in terms of height and fresh weight of plants in the greenhouse. It can be concluded that T. virens and A. fumigatus are the most effective antagonists in rice sheath blight disease control. Abstract The rice sheath blight disease, caused by Rhizoctonia solani J.G. Kühn fungus, is a major disease of Oryza sativa L. occurring all over the world. Therefore, efforts need to be undertaken to limit the spread of this pathogen, preferably by using environmentally friendly methods. In the present study, 57 fungal isolates were recovered by surface sterilization technique from 120 rice samples collected from paddy fields in Guilan province, Iran. Biological characterizations of the isolated taxa were performed in vitro, in the dual culture, volatile metabolites, and slide culture methods. Among the studied isolates, Trichoderma virens (J. H. Miller, Giddens and A. A. Foster) Arx was most effective in inhibiting the mycelial growth of R. solani in the dual culture (44.16% inhibition level), while Aspergillus fumigatus Fresen and T. virens had a 62.50–68.75% inhibition efficiency by volatile metabolites. In the slide culture, all of the isolates, except for T. harzianum Rifai, were effective in inhibiting the hyphae growth of R. solani. Under greenhouse conditions, rice plants inoculated with these potential antagonistic fungi showed a reduction in disease severity by even 41.4% as in the case of T. virens. Moreover, phenotypic properties of rice, such as plant height, fresh weight, and dry weight were increased in the plants inoculated with all antagonistic fungi tested, compared to the infected plants, except for the fresh weight of plants inoculated with Curnularia lunata (Wakker) Boedijn. The present in vivo and in vitro studies revealed that T. virens and A. fumigatus are the most effective antagonists in rice sheath blight disease control and could be applied in agricultural practice.
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Affiliation(s)
- Mohammad Reza Safari Motlagh
- Department of Plant Protection, Faculty of Agriculture, Rasht Branch, Islamic Azad University, Rasht 4147654919, Iran
- Correspondence: or (M.R.S.M.); (A.T.); Tel.: +48-52-374-95-64 (A.T.)
| | - Bahar Jahangiri
- Department of Plant Protection, Faculty of Agriculture, Mehrgan Institute for High Education, Mahallat 3781654363, Iran
| | - Dariusz Kulus
- Laboratory of Ornamental Plants and Vegetable Crops, Faculty of Agriculture and Biotechnology, Bydgoszcz University of Science and Technology, Bernardyńska 6, 85-029 Bydgoszcz, Poland
| | - Alicja Tymoszuk
- Laboratory of Ornamental Plants and Vegetable Crops, Faculty of Agriculture and Biotechnology, Bydgoszcz University of Science and Technology, Bernardyńska 6, 85-029 Bydgoszcz, Poland
- Correspondence: or (M.R.S.M.); (A.T.); Tel.: +48-52-374-95-64 (A.T.)
| | - Behzad Kaviani
- Department of Horticultural Science, Rasht Branch, Islamic Azad University, Rasht 4147654919, Iran
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Xu H, Yan L, Zhang M, Chang X, Zhu D, Wei D, Naeem M, Song C, Wu X, Liu T, Chen W, Yang W. Changes in the Density and Composition of Rhizosphere Pathogenic Fusarium and Beneficial Trichoderma Contributing to Reduced Root Rot of Intercropped Soybean. Pathogens 2022; 11:pathogens11040478. [PMID: 35456153 PMCID: PMC9031213 DOI: 10.3390/pathogens11040478] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Revised: 04/07/2022] [Accepted: 04/14/2022] [Indexed: 12/04/2022] Open
Abstract
The dynamic of soil-borne disease is closely related to the rhizosphere microbial communities. Maize–soybean relay strip intercropping has been shown to significantly control the type of soybean root rot that tends to occur in monoculture. However, it is still unknown whether the rhizosphere microbial community participates in the regulation of intercropped soybean root rot. In this study, rhizosphere Fusarium and Trichoderma communities were compared in either healthy or root-rotted rhizosphere soil from monocultured and intercropped soybean, and our results showed the abundance of rhizosphere Fusarium in intercropping was remarkably different from monoculture. Of four species identified, F. oxysporum was the most aggressive and more frequently isolated in diseased soil of monoculture. In contrast, Trichoderma was largely accumulated in healthy rhizosphere soil of intercropping rather than monoculture. T. harzianum dramatically increased in the rhizosphere of intercropping, while T. virens and T. afroharzianum also exhibited distinct isolation frequency. For the antagonism test in vitro, Trichoderma strains had antagonistic effects on F. oxysporum with the percentage of mycelial inhibition ranging from 50.59–92.94%, and they displayed good mycoparasitic abilities against F. oxysporum through coiling around and entering into the hyphae, expanding along the cell–cell lumen and even dissolving cell walls of the target fungus. These results indicate maize–soybean relay strip intercropping significantly increases the density and composition proportion of beneficial Trichoderma to antagonize the pathogenic Fusarium species in rhizosphere, thus potentially contributing to the suppression of soybean root rot under the intercropping.
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Affiliation(s)
- Huiting Xu
- Department of Plant Protection, College of Agronomy & Sichuan Engineering Research Center for Crop Strip Intercropping System, Sichuan Agricultural University, Chengdu 611130, China; (H.X.); (D.Z.); (D.W.); (M.N.); (C.S.); (X.W.); (W.Y.)
| | - Li Yan
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China; (L.Y.); (T.L.); (W.C.)
| | - Mingdi Zhang
- Department of International Law Affairs, Dong-a University, Busan 49236, Korea;
| | - Xiaoli Chang
- Department of Plant Protection, College of Agronomy & Sichuan Engineering Research Center for Crop Strip Intercropping System, Sichuan Agricultural University, Chengdu 611130, China; (H.X.); (D.Z.); (D.W.); (M.N.); (C.S.); (X.W.); (W.Y.)
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China; (L.Y.); (T.L.); (W.C.)
- Correspondence: ; Tel.: +86-028-86290872
| | - Dan Zhu
- Department of Plant Protection, College of Agronomy & Sichuan Engineering Research Center for Crop Strip Intercropping System, Sichuan Agricultural University, Chengdu 611130, China; (H.X.); (D.Z.); (D.W.); (M.N.); (C.S.); (X.W.); (W.Y.)
| | - Dengqin Wei
- Department of Plant Protection, College of Agronomy & Sichuan Engineering Research Center for Crop Strip Intercropping System, Sichuan Agricultural University, Chengdu 611130, China; (H.X.); (D.Z.); (D.W.); (M.N.); (C.S.); (X.W.); (W.Y.)
| | - Muhammd Naeem
- Department of Plant Protection, College of Agronomy & Sichuan Engineering Research Center for Crop Strip Intercropping System, Sichuan Agricultural University, Chengdu 611130, China; (H.X.); (D.Z.); (D.W.); (M.N.); (C.S.); (X.W.); (W.Y.)
| | - Chun Song
- Department of Plant Protection, College of Agronomy & Sichuan Engineering Research Center for Crop Strip Intercropping System, Sichuan Agricultural University, Chengdu 611130, China; (H.X.); (D.Z.); (D.W.); (M.N.); (C.S.); (X.W.); (W.Y.)
| | - Xiaoling Wu
- Department of Plant Protection, College of Agronomy & Sichuan Engineering Research Center for Crop Strip Intercropping System, Sichuan Agricultural University, Chengdu 611130, China; (H.X.); (D.Z.); (D.W.); (M.N.); (C.S.); (X.W.); (W.Y.)
| | - Taiguo Liu
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China; (L.Y.); (T.L.); (W.C.)
| | - Wanquan Chen
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China; (L.Y.); (T.L.); (W.C.)
| | - Wenyu Yang
- Department of Plant Protection, College of Agronomy & Sichuan Engineering Research Center for Crop Strip Intercropping System, Sichuan Agricultural University, Chengdu 611130, China; (H.X.); (D.Z.); (D.W.); (M.N.); (C.S.); (X.W.); (W.Y.)
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Tang X, Chen S, Yan X, Wang Z, Yuan H, Yang D. Factors Underlying the Prevalence of Pythium Infection of Corn Seeds Following Seed Treatment Application of Tebuconazole. PLANT DISEASE 2022; 106:1134-1142. [PMID: 34752126 DOI: 10.1094/pdis-07-21-1586-re] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Microbial communities are essential for soil health, but fungicide application may have significant effects on their structure. It is difficult to predict whether nontarget pathogens of applied fungicides in the soil will cause crop damage. Tebuconazole is a triazole fungicide that can be used as a seed treatment and, thereby, introduced to the soil. However, seed-applied tebuconazole has a potential risk of causing poor emergence of corn (Zea mays) seedlings. Using soil with a history of poor corn seedling emergence, we demonstrate through TA cloning and isolation that the poor emergence of corn seedlings from tebuconazole-coated corn seeds was primarily because of infection by surviving soil pathogens, specifically Pythium species that are not targeted by tebuconazole, rather than the phytotoxic effects of tebuconazole. Bioassay tests on tebuconazole-amended media showed that tebuconazole can suppress soil fungi while allowing Pythium to grow. Pythium species primarily contributing to the corn seed rot were more pathogenic at cooler temperatures. Furthermore, the nontarget biocontrol agent of Trichoderma spp. was strongly inhibited by tebuconazole. Taken together, the nontarget effects of tebuconazole are likely not significant under favorable plant growing conditions but are considerable because of low-temperature stress.
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Affiliation(s)
- Xiujun Tang
- Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Shuning Chen
- Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Xiaojing Yan
- Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Zhenying Wang
- Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Huizhu Yuan
- Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Daibin Yang
- Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
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Gibot-Leclerc S, Guinchard L, Edel-Hermann V, Dessaint F, Cartry D, Reibel C, Gautheron N, Bernaud E, Steinberg C. Screening for potential mycoherbicides within the endophyte community of Phelipanche ramosa parasitizing tobacco. FEMS Microbiol Ecol 2022; 98:fiac024. [PMID: 35212759 DOI: 10.1093/femsec/fiac024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Revised: 02/04/2022] [Accepted: 02/23/2022] [Indexed: 11/12/2022] Open
Abstract
Branched broomrape (Phelipanche ramosa (L.) Pomel) is an achlorophyllous root parasitic plant with a wide host range. Its complex management is leading to the abandonment of tobacco or oilseed rape cultivation in the most affected regions in France. Among broomrape regulation factors, soil microorganisms such as fungi seem to be a relevant biocontrol lever. The aim of this work was to detect potential mycoherbicides among fungal endophytic colonizers of P. ramosa parasitizing tobacco. Our hypothesis was that both the inhibitory of broomrape seed germination and the necrotic activities are characteristic of the fungal isolates whatever their taxonomic position. To test this hypothesis, we analysed the taxonomic and functional diversity of fungal isolates of symptomatic P. ramosa collected from infested tobacco-growing regions in France in order to identify one or more fungal strains for future biocontrol. The fungal isolates were characterized using morphological and molecular identification tools and tested for their ability to inhibit the germination of P. ramosa seeds, their necrotic activity on the stems of the pest and their non-pathogenicity to the host plant. We highlighted the specific richness of fungal colonizers associated with symptomatic P. ramosa. Among the 374 collected isolates, nearly 80% belonged to 19 Fusarium species. Eighty-seven isolates representative of this diversity also showed functional diversity by inhibiting seed germination of the parasite. The 20 best-performing isolates showed differences in germination inhibition of P. ramosa at the intraspecific level. Among these 20 fungal isolates, a set of 15 randomly selected isolates was tested for their necrotic activity on the parasite stems. Fusarium venenatum isolates showed dual competence, i.e. germination inhibition and necrotic activity, and were non-pathogenic to tobacco. This led us to discuss the potential mycoherbicidal effect of this fungal species on P. ramosa.
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Affiliation(s)
- Stéphanie Gibot-Leclerc
- Agroécologie, INRAE, Institut Agro, Univ. Bourgogne, Univ. Bourgogne Franche-Comté, 21000 Dijon, France
| | - Lucie Guinchard
- Agroécologie, INRAE, Institut Agro, Univ. Bourgogne, Univ. Bourgogne Franche-Comté, 21000 Dijon, France
| | - Véronique Edel-Hermann
- Agroécologie, INRAE, Institut Agro, Univ. Bourgogne, Univ. Bourgogne Franche-Comté, 21000 Dijon, France
| | - Fabrice Dessaint
- Agroécologie, INRAE, Institut Agro, Univ. Bourgogne, Univ. Bourgogne Franche-Comté, 21000 Dijon, France
| | - Dïnia Cartry
- Agroécologie, INRAE, Institut Agro, Univ. Bourgogne, Univ. Bourgogne Franche-Comté, 21000 Dijon, France
| | - Carole Reibel
- Agroécologie, INRAE, Institut Agro, Univ. Bourgogne, Univ. Bourgogne Franche-Comté, 21000 Dijon, France
| | - Nadine Gautheron
- Agroécologie, INRAE, Institut Agro, Univ. Bourgogne, Univ. Bourgogne Franche-Comté, 21000 Dijon, France
| | - Eric Bernaud
- Agroécologie, INRAE, Institut Agro, Univ. Bourgogne, Univ. Bourgogne Franche-Comté, 21000 Dijon, France
| | - Christian Steinberg
- Agroécologie, INRAE, Institut Agro, Univ. Bourgogne, Univ. Bourgogne Franche-Comté, 21000 Dijon, France
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Favaro CP, Klaic R, Bettiol W, Ribeiro C, Farinas CS. Bio-based composite granules with simultaneous biocontrol and phosphorus fertilization roles: outcomes from a lab-scale in-vitro assessment. Biotechnol Prog 2022; 38:e3242. [PMID: 35134271 DOI: 10.1002/btpr.3242] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Revised: 01/31/2022] [Accepted: 02/07/2022] [Indexed: 11/06/2022]
Abstract
The use of phosphate rocks as low-solubility phosphorus fertilizers has been promoted to reduce the environmental impacts of agriculture, but adequate nutrient uptake by plants depends on solubilization of the rock, driven by soil microorganisms. Here, investigation was made of the microbial solubilization of low-solubility phosphate rocks, together with simultaneous bioprotective action involving the biocontrol of microorganisms. The aim was to enhance function and value by delivering two effects using a single bio-based product, in accordance with the concept of a "bioreactor-in-a-granule" system. A composite structure was developed, based on a starch matrix, comprising a combination of Trichoderma asperelloides, as a biocontrol agent, and Aspergillus niger, as an acidulant. A significant increase of up to 150% in P solubilization was achieved, indicating the positive effect of the microorganism-composite interaction. In vitro assays showed that the ability of T. asperelloides to inhibit Fusarium oxysporum mycelial growth was maintained in the presence of A. niger. Moreover, the estimated cost of the composite granule (0.35 US$/kg of product on a dry basis) revealed competitive. The results indicated that the association of T. asperelloides and A. niger is an effective way to increase nutrient availability and to inhibit plant pathogens, opening up possibilities for the design of multifunctional bio-based fertilizer composites. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- C P Favaro
- Graduate Program in Chemical Engineering, Federal University of São Carlos, Rod. Washington Luiz, km 235, São Carlos, SP, Brazil.,Embrapa Instrumentação, Rua XV de Novembro 1452, São Carlos, SP, Brazil
| | - R Klaic
- Graduate Program in Chemical Engineering, Federal University of São Carlos, Rod. Washington Luiz, km 235, São Carlos, SP, Brazil.,Embrapa Instrumentação, Rua XV de Novembro 1452, São Carlos, SP, Brazil
| | - W Bettiol
- Embrapa Meio Ambiente, Rod. SP 340, km 127, Jaguariúna, SP, Brazil
| | - C Ribeiro
- Embrapa Instrumentação, Rua XV de Novembro 1452, São Carlos, SP, Brazil
| | - C S Farinas
- Graduate Program in Chemical Engineering, Federal University of São Carlos, Rod. Washington Luiz, km 235, São Carlos, SP, Brazil.,Embrapa Instrumentação, Rua XV de Novembro 1452, São Carlos, SP, Brazil
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18
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Di Marco S, Metruccio EG, Moretti S, Nocentini M, Carella G, Pacetti A, Battiston E, Osti F, Mugnai L. Activity of Trichoderma asperellum Strain ICC 012 and Trichoderma gamsii Strain ICC 080 Toward Diseases of Esca Complex and Associated Pathogens. Front Microbiol 2022; 12:813410. [PMID: 35154039 PMCID: PMC8831765 DOI: 10.3389/fmicb.2021.813410] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Accepted: 12/16/2021] [Indexed: 01/19/2023] Open
Abstract
Grapevine trunk diseases are widespread in all grape-growing countries. The diseases included in the Esca complex of diseases are particularly common in European vineyards. Their distinctive foliar symptoms are well known to be associated not only with losses in quantity, as with all grapevine wood diseases, but also with losses in the quality of the crop. Protection of pruning wounds is known to reduce infections in artificial inoculations and, to some extent, reduce the external leaf symptoms. The application of biological control agents in the field is typically started at the first appearance of symptoms. In this article, the two strains belonging to two different species, Trichoderma asperellum ICC 012 and T. gamsii ICC 080, which are present in a commercial formulation, were tested in vitro, in vivo in artificial inoculation, and in the field in long-term experiments where the wounds on four young asymptomatic vineyards were protected since 1 or 2 years after planting. The in vitro trials highlighted the different temperature requirements of the two strains, the direct mycoparasitizing activity of T. asperellum, and the indirect activity shown by both Trichoderma strains. The in vivo trials confirmed the ability of the two strains to reduce the colonization following artificial inoculations with the high, unnatural concentration of spores used in artificial infections, even if with variable efficacy, and with long persistence as they could be reisolated 7 months post-application. The preventive applications carried out over 9 years showed a very high reduction in symptom development in the treated vines, on annual and cumulated incidence and on the death of vines, with disease reduction varying from 66 to almost 90%. Early and annual application of protection to the pruning wounds appears to be the best method for reducing damages caused by grapevine leaf stripe disease (a disease of the Esca complex of diseases). Trichoderma appears to offer an efficient, environmentally friendly, and long-lasting protection in the presence of a natural inoculum concentration.
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Affiliation(s)
- Stefano Di Marco
- Institute of BioEconomy, National Research Council, Bologna, Italy
| | | | - Samuele Moretti
- Plant Pathology and Entomology Section, Department of Agricultural, Food, Environmental and Forestry Science and Technology (DAGRI), University of Florence, Florence, Italy
- *Correspondence: Samuele Moretti,
| | - Marco Nocentini
- Plant Pathology and Entomology Section, Department of Agricultural, Food, Environmental and Forestry Science and Technology (DAGRI), University of Florence, Florence, Italy
| | - Giuseppe Carella
- Plant Pathology and Entomology Section, Department of Agricultural, Food, Environmental and Forestry Science and Technology (DAGRI), University of Florence, Florence, Italy
| | - Andrea Pacetti
- Plant Pathology and Entomology Section, Department of Agricultural, Food, Environmental and Forestry Science and Technology (DAGRI), University of Florence, Florence, Italy
| | - Enrico Battiston
- Plant Pathology and Entomology Section, Department of Agricultural, Food, Environmental and Forestry Science and Technology (DAGRI), University of Florence, Florence, Italy
| | - Fabio Osti
- Institute of BioEconomy, National Research Council, Bologna, Italy
- Fabio Osti,
| | - Laura Mugnai
- Plant Pathology and Entomology Section, Department of Agricultural, Food, Environmental and Forestry Science and Technology (DAGRI), University of Florence, Florence, Italy
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Gohel NM, Raghunandan BL, Patel NB, Parmar HV, Raval DB. Role of Fungal Biocontrol Agents for Sustainable Agriculture. Fungal Biol 2022. [DOI: 10.1007/978-981-16-8877-5_28] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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de Souza RR, Moraes MP, Paraginski JA, Moreira TF, Bittencourt KC, Toebe M. Effects of Trichoderma asperellum on Germination Indexes and Seedling Parameters of Lettuce Cultivars. Curr Microbiol 2021; 79:5. [PMID: 34902081 DOI: 10.1007/s00284-021-02713-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2021] [Accepted: 10/11/2021] [Indexed: 10/19/2022]
Abstract
The aim of this study was to analyze the effects of Trichoderma asperellum on germination indexes and seedling parameters of lettuce cultivars. The trial was arranged in a completely randomized design with three cultivars (Cerbiata, Crespa Grand Rapids, and Mimosa), and two seed-treatment products (quality and organic) containing strain URM 5911 of Trichoderma asperellum plus a control group (untreated), with four repetitions. After seven days, six seedling characters were measured (shoot length, radicle length, total length, shoot diameter, radicle diameter, and seedling dry matter) and eight germination indexes were calculated (germination, first count, mean germination time, germination speed index, coefficient of velocity of germination, mean germination rate, Timson's germination index, and germination rate index). In general, regarding the germination indexes, the effect of the genotype factor predominated over the Trichoderma factor. The seedling characters showed significance for genotype × Trichoderma interaction for shoot length, shoot diameter, radicle diameter, and seedling dry matter. Such results demonstrate that the effects of Trichoderma asperellum on lettuce seedlings variate according to the cultivar used.
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Affiliation(s)
- Rafael Rodrigues de Souza
- Department of Agronomic and Environmental Sciences, Federal University of Santa Maria (UFSM), Frederico Westphalen, RS, Brazil.
| | - Mariana Poll Moraes
- Department of Agronomic and Environmental Sciences, Federal University of Santa Maria (UFSM), Frederico Westphalen, RS, Brazil
| | - João Antônio Paraginski
- Department of Agronomic and Environmental Sciences, Federal University of Santa Maria (UFSM), Frederico Westphalen, RS, Brazil
| | - Thainá Fogliatto Moreira
- Department of Agronomic and Environmental Sciences, Federal University of Santa Maria (UFSM), Frederico Westphalen, RS, Brazil
| | | | - Marcos Toebe
- Department of Agronomic and Environmental Sciences, Federal University of Santa Maria (UFSM), Frederico Westphalen, RS, Brazil
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Naher L, Fatin SN, Sheikh MAH, Azeez LA, Siddiquee S, Zain NM, Karim SMR. Cellulase Enzyme Production from Filamentous Fungi Trichoderma reesei and Aspergillus awamori in Submerged Fermentation with Rice Straw. J Fungi (Basel) 2021; 7:jof7100868. [PMID: 34682288 PMCID: PMC8539901 DOI: 10.3390/jof7100868] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Revised: 10/08/2021] [Accepted: 10/09/2021] [Indexed: 12/03/2022] Open
Abstract
Fungi are a diverse group of microorganisms that play many roles in human livelihoods. However, the isolation of potential fungal species is the key factor to their utilization in different sectors, including the enzyme industry. Hence, in this study, we used two different fungal repositories—soil and weed leaves—to isolate filamentous fungi and evaluate their potential to produce the cellulase enzyme. The fungal strains were isolated using dichloran rose bengal agar (DRBA) and potato dextrose agar (PDA). For cellulase enzyme production, a rice straw submerged fermentation process was used. The enzyme production was carried out at the different incubation times of 3, 5, and 7 days of culture in submerged conditions with rice straw. Fungal identification studies by morphological and molecular methods showed that the soil colonies matched with Trichoderma reesei, and the weed leaf colonies matched with Aspergillus awamori. These species were coded as T. reesei UMK04 and A. awamori UMK02, respectively. This is the first report of A. awamori UMK02 isolation in Malaysian agriculture. The results of cellulase production using the two fungi incorporated with rice straw submerged fermentation showed that T. reesei produced a higher amount of cellulase at Day 5 (27.04 U/mg of dry weight) as compared with A. awamori (15.19 U/mg of dry weight), and the concentration was significantly different (p < 0.05). Our results imply that T. reesei can be utilized for cellulase production using rice straw.
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Affiliation(s)
- Laila Naher
- Faculty of Agro-Based Industry, Universiti Malaysia Kelantan Jeli Campus, Jeli 17600, Malaysia; (S.N.F.); (M.A.H.S.); (L.A.A.); (N.M.Z.)
- Institute of Food Security and Sustainable Agriculture, Universiti Malaysia Kelantan Jeli Campus, Jeli 17600, Malaysia
- Institute of Research and Poverty Management (InsPek), Universiti Malaysia Kelantan Bachok, Bachok 16400, Malaysia
- Correspondence:
| | - Siti Noor Fatin
- Faculty of Agro-Based Industry, Universiti Malaysia Kelantan Jeli Campus, Jeli 17600, Malaysia; (S.N.F.); (M.A.H.S.); (L.A.A.); (N.M.Z.)
| | - Md Abdul Halim Sheikh
- Faculty of Agro-Based Industry, Universiti Malaysia Kelantan Jeli Campus, Jeli 17600, Malaysia; (S.N.F.); (M.A.H.S.); (L.A.A.); (N.M.Z.)
| | - Lateef Adebola Azeez
- Faculty of Agro-Based Industry, Universiti Malaysia Kelantan Jeli Campus, Jeli 17600, Malaysia; (S.N.F.); (M.A.H.S.); (L.A.A.); (N.M.Z.)
- Department of Plant Biology, Faculty of Life Sciences, University of Ilorin, Ilorin 240003, Nigeria
| | - Shaiquzzaman Siddiquee
- Biotechnology Research Institute, Universiti Malaysia Sabah, Jalan UMS, Kota Kinabalu 88400, Malaysia;
| | - Norhafizah Md Zain
- Faculty of Agro-Based Industry, Universiti Malaysia Kelantan Jeli Campus, Jeli 17600, Malaysia; (S.N.F.); (M.A.H.S.); (L.A.A.); (N.M.Z.)
- Institute of Food Security and Sustainable Agriculture, Universiti Malaysia Kelantan Jeli Campus, Jeli 17600, Malaysia
- Institute of Research and Poverty Management (InsPek), Universiti Malaysia Kelantan Bachok, Bachok 16400, Malaysia
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22
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In vitro and in silico approach of fungal growth inhibition by Trichoderma asperellum HbGT6-07 derived volatile organic compounds. ARAB J CHEM 2021. [DOI: 10.1016/j.arabjc.2021.103290] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
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Ferreira FV, Musumeci MA. Trichoderma as biological control agent: scope and prospects to improve efficacy. World J Microbiol Biotechnol 2021; 37:90. [PMID: 33899136 DOI: 10.1007/s11274-021-03058-7] [Citation(s) in RCA: 57] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Accepted: 04/19/2021] [Indexed: 10/21/2022]
Abstract
A major current challenge is to increase the food production while preserving natural resources. Agricultural practices that enhance the productivity and progressively improve the soil quality are relevant to face this challenge. Trichoderma species are widely used in agriculture to stimulate the plant growth and to control different pathogens affecting crops, representing useful tools for sustainable food production. This mini-review summarizes applications of Trichoderma strains in agriculture to control fungal pathogens, nematodes and insects, the involved biocontrol mechanisms, efficacy and inoculation forms in greenhouse, field and post-harvest conditions. Aspects of Trichoderma handling that influence on biocontrol efficacy such as preventive treatments, frequency of applications and delivery methods are discussed. Strategies useful to improve the antagonistic performance such as the use of native strains, protoplast fusion, formulation, growth on pathogen cell wall medium and combination with other antagonists in integrated treatments are discussed. This mini-review provides practical knowledge to design safe and optimal biocontrol strategies based on Trichoderma and pose challenges to expand its antagonist performance.
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Affiliation(s)
- Flavia V Ferreira
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) - Centro de Investigaciones y Transferencia de Entre Ríos (CITER), Monseñor Tavella 1450 (E3202 BCJ), Concordia, Entre Ríos, Argentina
| | - Matías A Musumeci
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) - Centro de Investigaciones y Transferencia de Entre Ríos (CITER), Monseñor Tavella 1450 (E3202 BCJ), Concordia, Entre Ríos, Argentina. .,Facultad de Ciencias de la Alimentación, Universidad Nacional de Entre Ríos, Monseñor Tavella 1450 (E3202 BCJ), Concordia, Entre Ríos, Argentina.
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Asis A, Shahriar SA, Naher L, Saallah S, Fatihah HNN, Kumar V, Siddiquee S. Identification patterns of Trichoderma strains using morphological characteristics, phylogenetic analyses and lignocellulolytic activities. Mol Biol Rep 2021; 48:3285-3301. [PMID: 33880673 DOI: 10.1007/s11033-021-06321-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2020] [Accepted: 03/27/2021] [Indexed: 11/29/2022]
Abstract
Trichoderma is a genus of soil-borne fungus with an abundance of reports of its economic importance in the agriculture industry. Thus, the correct identification of Trichoderma species is necessary for its commercial purposes. Globally, Trichoderma species are routinely identified from micro-morphological descriptions which can be tedious and prone to errors. Thus, we emphasize that the accurate identification of Trichoderma strains requires a three-pronged approach i.e. based on its morphological characteristics, multilocus gene sequences of the rDNA [internal transcribed spacer (ITS) 1 and 2 regions], translation elongation factor 1-α (TEF-1α), Calmodulin (CAL) and its lignocellulolytic activities. We used this approach to identify a total of 53 Trichoderma strains which were isolated from a wet paddy field located at Tuaran, Sabah, Malaysia. The 53 strains were positively identified as belonging to three Trichoderma species, namely T. asperellum (43 strains), T. harzianum (9 strains), and T. reesei (one strain) on the basis of its morphological characteristics and multilocus gene sequences. Phylogenetic trees constructed based on the UPGMA method of the ITS 1 and 2 regions of the rDNA, TEF-1α and CAL revealed three distinct groups with the T. asperellum, T. harzianum and T. reesei strains placed under the section of Trichoderma, Pachybasium and Longibrachiatum, respectively. In addition, the lignocellulolytic activities of the isolates were measured based on the diameters of the halo zones produced when degrading cellulose, lignin, and starch, respectively. This diagnostic assay can be used to identify Trichoderma as it produces polyphenol oxidase when Tannic Acid Media is used for the lignin test, endoglucanases when Jensen media is used for cellulose, and it hydrolyzes starch to glucose when the modified Melin-Nokrans media is used for the starch test. Accurate identification of Trichoderma species is needed as these strains can potentially be used as a biocontrol agent to prevent diseases and to increase yield in agriculture crops.
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Affiliation(s)
- Azriah Asis
- Biotechnology Research Institute, Universiti Malaysia Sabah, Jln UMS, 88400, Kota Kinabalu, Sabah, Malaysia
| | - Saleh Ahmed Shahriar
- School of Biological Sciences, Universiti Sains Malaysia, 11800, Penang, Malaysia
| | - Laila Naher
- Faculty of Agro-Based Industry, Universiti Malaysia Kelantan, 17600 Pengkalan Chepa, Jeli Campus, Kelantan Darul Naim, Malaysia
| | - Suryani Saallah
- Biotechnology Research Institute, Universiti Malaysia Sabah, Jln UMS, 88400, Kota Kinabalu, Sabah, Malaysia
| | - Hasan Nudin Nur Fatihah
- Faculty of Bioresources and Food Industry, Universiti Sultan Zainal Abidin, Kampus Besut, 22200, Besut, Terengganu, Malaysia
| | - Vijay Kumar
- Biotechnology Research Institute, Universiti Malaysia Sabah, Jln UMS, 88400, Kota Kinabalu, Sabah, Malaysia
| | - Shafiquzzaman Siddiquee
- Biotechnology Research Institute, Universiti Malaysia Sabah, Jln UMS, 88400, Kota Kinabalu, Sabah, Malaysia.
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25
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Characterization of fungal flora associated with sternorrhyncha insects of cotton plants. Biologia (Bratisl) 2021. [DOI: 10.2478/s11756-020-00549-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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26
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Fungal Communities as Biological Control Agents for Different Phytopathogenic Organisms. Fungal Biol 2021. [DOI: 10.1007/978-3-030-60659-6_8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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27
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Chitinase production by Trichoderma koningiopsis UFSMQ40 using solid state fermentation. Braz J Microbiol 2020; 51:1897-1908. [PMID: 32737868 DOI: 10.1007/s42770-020-00334-w] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Accepted: 06/30/2020] [Indexed: 12/23/2022] Open
Abstract
The chitinases have extensive biotechnological potential but have been little exploited commercially due to the low number of good chitinolytic microorganisms. The purpose of this study was to identify a chitinolytic fungal and optimize its production using solid state fermentation (SSF) and agroindustry substrate, to evaluate different chitin sources for chitinase production, to evaluate different solvents for the extraction of enzymes produced during fermentation process, and to determine the nematicide effect of enzymatic extract and biological control of Meloidogyne javanica and Meloidogyne incognita nematodes. The fungus was previously isolated from bedbugs of Tibraca limbativentris Stal (Hemiptera: Pentatomidae) and selected among 51 isolated fungal as the largest producer of chitinolytic enzymes in SSF. The isolate UFSMQ40 has been identified as Trichoderma koningiopsis by the amplification of tef1 gene fragments. The greatest chitinase production (10.76 U gds-1) occurred with wheat bran substrate at 55% moisture, 15% colloidal chitin, 100% of corn steep liquor, and two discs of inoculum at 30 °C for 72 h. Considering the enzymatic inducers, the best chitinase production by the isolated fungus was achieved using chitin in colloidal, powder, and flakes. The usage of 1:15 g/mL of sodium citrate-phosphate buffer was the best ratio for chitinase extraction of SSF. The Trichoderma koningiopsis UFSMQ40 showed high mortality of M. javanica and M. incognita when applied to treatments with enzymatic filtrated and the suspension of conidia.
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Pavlovskaya N, Gneusheva I, Solokhina I, Ageeva N. The biological activity of subspecies Trichoderma harzianum against Fusarium oxysporum, the causative agent of fusarium wilt cucumber in vitro. BIO WEB OF CONFERENCES 2020. [DOI: 10.1051/bioconf/20202100021] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The study of the effect of the strains of the fungus Trichoderma: Trichoderma atrobrunneum VKPM F-1434, Trichoderma harzianum 5/14, Trichoderma Lixii T4/14 on the number of micromycetes populations of the pathogenic fungi Fusarium oxysporum isolate B/14, Fusarium oxysporum isolate MOS509, Fysarium oxysporum isolate IMI58289 in vitro. It was found that the Trichoderma atrobrunneum fungus strain VKPM F-1434 showed the highest degree of inhibition on 10 days of cultivation with phytopathogenic microorganisms, which was 100 %. The study revealed that all Trichoderma species are capable of producing lytic enzymes. Trichoderma atrobrunneum strain VKPM F-1434 exhibits strong lipase and chitinase activity and average proteinase activity. In addition, Trichoderma atrobrunneum strain VKPM F-1434 has a growth-promoting ability, which was reflected in the germination of seeds of cucumber “German F1”. The maximum values of indicators of germination energy were noted – 98.4 % and germination – 100 %.
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30
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Barra-Bucarei L, France Iglesias A, Gerding González M, Silva Aguayo G, Carrasco-Fernández J, Castro JF, Ortiz Campos J. Antifungal Activity of Beauveria bassiana Endophyte against Botrytis cinerea in Two Solanaceae Crops. Microorganisms 2019; 8:microorganisms8010065. [PMID: 31906060 PMCID: PMC7022534 DOI: 10.3390/microorganisms8010065] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Revised: 12/24/2019] [Accepted: 12/28/2019] [Indexed: 11/16/2022] Open
Abstract
Botrytis cinerea causes substantial losses in tomato and chili pepper crops worldwide. Endophytes have shown the potential for the biological control of diseases. The colonization ability of native endophyte strains of Beauveria bassiana and their antifungal effect against B. cinerea were evaluated in Solanaceae crops. Root drenching with B. bassiana was applied, and endophytic colonization capacity in roots, stems, and leaves was determined. The antagonistic activity was evaluated using in vitro dual culture and also plants by drenching the endophyte on the root and by pathogen inoculation in the leaves. Ten native strains were endophytes of tomato, and eight were endophytes of chili pepper. All strains showed significant in vitro antagonism against B. cinerea (30–36%). A high antifungal effect was observed, and strains RGM547 and RGM644 showed the lowest percentage of the surface affected by the pathogen. Native strains of B. bassiana colonized tomato and chili pepper tissues and provided important levels of antagonism against B. cinerea.
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Affiliation(s)
- Lorena Barra-Bucarei
- Instituto de Investigaciones Agropecuarias (INIA) Quilamapu, Av. Vicente Méndez 515, Chillán 3800062, Chile; (A.F.I.); (J.C.-F.); (J.F.C.); (J.O.C.)
- Facultad de Agronomía, Universidad de Concepción, Vicente Mendez 595, Chillán 3812120, Chile; (M.G.G.); (G.S.A.)
- Correspondence:
| | - Andrés France Iglesias
- Instituto de Investigaciones Agropecuarias (INIA) Quilamapu, Av. Vicente Méndez 515, Chillán 3800062, Chile; (A.F.I.); (J.C.-F.); (J.F.C.); (J.O.C.)
| | - Macarena Gerding González
- Facultad de Agronomía, Universidad de Concepción, Vicente Mendez 595, Chillán 3812120, Chile; (M.G.G.); (G.S.A.)
| | - Gonzalo Silva Aguayo
- Facultad de Agronomía, Universidad de Concepción, Vicente Mendez 595, Chillán 3812120, Chile; (M.G.G.); (G.S.A.)
| | - Jorge Carrasco-Fernández
- Instituto de Investigaciones Agropecuarias (INIA) Quilamapu, Av. Vicente Méndez 515, Chillán 3800062, Chile; (A.F.I.); (J.C.-F.); (J.F.C.); (J.O.C.)
| | - Jean Franco Castro
- Instituto de Investigaciones Agropecuarias (INIA) Quilamapu, Av. Vicente Méndez 515, Chillán 3800062, Chile; (A.F.I.); (J.C.-F.); (J.F.C.); (J.O.C.)
| | - Javiera Ortiz Campos
- Instituto de Investigaciones Agropecuarias (INIA) Quilamapu, Av. Vicente Méndez 515, Chillán 3800062, Chile; (A.F.I.); (J.C.-F.); (J.F.C.); (J.O.C.)
- Facultad de Agronomía, Universidad de Concepción, Vicente Mendez 595, Chillán 3812120, Chile; (M.G.G.); (G.S.A.)
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Coppola M, Cascone P, Lelio ID, Woo SL, Lorito M, Rao R, Pennacchio F, Guerrieri E, Digilio MC. Trichoderma atroviride P1 Colonization of Tomato Plants Enhances Both Direct and Indirect Defense Barriers Against Insects. Front Physiol 2019; 10:813. [PMID: 31333483 PMCID: PMC6624734 DOI: 10.3389/fphys.2019.00813] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Accepted: 06/11/2019] [Indexed: 02/03/2023] Open
Abstract
Numerous microbial root symbionts are known to induce different levels of enhanced plant protection against a variety of pathogens. However, more recent studies have demonstrated that beneficial microbes are able to induce plant systemic resistance that confers some degree of protection against insects. Here, we report how treatments with the fungal biocontrol agent Trichoderma atroviride strain P1 in tomato plants induce responses that affect pest insects with different feeding habits: the noctuid moth Spodoptera littoralis (Boisduval) and the aphid Macrosiphum euphorbiae (Thomas). We observed that the tomato plant-Trichoderma P1 interaction had a negative impact on the development of moth larvae and on aphid longevity. These effects were attributed to a plant response induced by Trichoderma that was associated with transcriptional changes of a wide array of defense-related genes. While the impact on aphids could be related to the up-regulation of genes involved in the oxidative burst reaction, which occur early in the defense reaction, the negative performance of moth larvae was associated with the enhanced expression of genes encoding for protective enzymes (i.e., Proteinase inhibitor I (PI), Threonine deaminase, Leucine aminopeptidase A1, Arginase 2, and Polyphenol oxidase) that are activated downstream in the defense cascade. In addition, Trichoderma P1 produced alterations in plant metabolic pathways leading to the production and release of volatile organic compounds (VOCs) that are involved in the attraction of the aphid parasitoid Aphidius ervi, thus reinforcing the indirect plant defense barriers. Our findings, along with the evidence available in the literature, indicate that the outcome of the tripartite interaction among plant, Trichoderma, and pests is highly specific and only a comprehensive approach, integrating both insect phenotypic changes and plant transcriptomic alterations, can allow a reliable prediction of its potential for plant protection.
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Affiliation(s)
- Mariangela Coppola
- Department of Agricultural Sciences, University of Naples Federico II, Naples, Italy
| | | | - Ilaria Di Lelio
- Department of Agricultural Sciences, University of Naples Federico II, Naples, Italy
| | - Sheridan Lois Woo
- CNR–IPSP, Portici, Italy
- Department of Pharmacy, University of Naples Federico II, Naples, Italy
- Task Force on Microbiome Studies, University of Naples Federico II, Naples, Italy
| | - Matteo Lorito
- Department of Agricultural Sciences, University of Naples Federico II, Naples, Italy
- CNR–IPSP, Portici, Italy
- Task Force on Microbiome Studies, University of Naples Federico II, Naples, Italy
| | - Rosa Rao
- Department of Agricultural Sciences, University of Naples Federico II, Naples, Italy
- Task Force on Microbiome Studies, University of Naples Federico II, Naples, Italy
| | - Francesco Pennacchio
- Department of Agricultural Sciences, University of Naples Federico II, Naples, Italy
- Task Force on Microbiome Studies, University of Naples Federico II, Naples, Italy
| | | | - Maria Cristina Digilio
- Department of Agricultural Sciences, University of Naples Federico II, Naples, Italy
- Task Force on Microbiome Studies, University of Naples Federico II, Naples, Italy
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32
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Anees M, Abid M, Chohan S, Jamil M, Ahmed N, Zhang L, Rha ES. In situ Impact of the Antagonistic Fungal Strain, Trichoderma gamsii T30 on the Plant Pathogenic Fungus, Rhizoctonia solani in Soil. Pol J Microbiol 2019; 68:211-216. [PMID: 31250591 PMCID: PMC7256831 DOI: 10.33073/pjm-2019-021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2018] [Revised: 02/12/2019] [Accepted: 02/12/2019] [Indexed: 11/24/2022] Open
Abstract
Rhizoctonia solani is a soil-borne fungus causing a wide range of plants diseases. Trichoderma gamsii strain T30 has previously been reported as antagonistic against R. solani. Although there are a few studies about the influence of Trichoderma strains on the R. solani density in a pathosystem in the presence of plant hosts, this report for the first time comprehensively describes in situ effects of a T. gamsii strain on the population density of R. solani in the soil microcosmic conditions. The population dynamics of R. solani were followed in the autoclaved and non-autoclaved soils in artificially prepared microcosms up to day 25 after co-inoculation with T. gamsii in the variable ratios (R1/T1; R1/T0.1; R1/T0.01 of R. solani/T. gamsii). The population density of R. solani was evaluated by qPCR. In the autoclaved soil, target DNA copies of R. solani increased in the control samples from 1 × 105 to 6.5 × 106. At R1/T0.01, the number of target DNA copies were not significantly changed until day 11; however, it decreased by around five times at day 25. At R1/T0.1 and R1/T1, the number of DNA copies was reduced to 2.1 × 106 and 7.6 × 105 at day 11, respectively and the reduction was as much as 17 times at day 25. In the non-autoclaved soil, the number of the fungal cells decreased at day 25 whether inoculated or not with Trichoderma indicating a general suppression by the soil microbiome. In brief, T. gamsii significantly inhibited the growth of R. solani in the soil in situ and there was a general suppressive effect of the natural microbiome.
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Affiliation(s)
- Muhammad Anees
- Department of Microbiology, Kohat University of Science & Technology , Kohat , Pakistan
| | - Muhammad Abid
- Department of Plant Pathology, Baha ud Din Zakaria University , Multan , Pakistan
| | - Sobia Chohan
- Department of Plant Pathology, Baha ud Din Zakaria University , Multan , Pakistan
| | - Muhammad Jamil
- Department of Biotechnology & Genetic Engineering, Kohat University of Science & Technology , Kohat , Pakistan
| | - Nadeem Ahmed
- Department of Botany, Mohi ud Din Islamic University AJ&K , Pakistan
| | | | - Eui Shik Rha
- Department of Well-being Resources, Sunchon National University , South Korea
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Li J, Wu Y, Chen K, Wang Y, Hu J, Wei Y, Yang H. Trichoderma cyanodichotomus sp. nov., a new soil-inhabiting species with a potential for biological control. Can J Microbiol 2018; 64:1020-1029. [PMID: 30199653 DOI: 10.1139/cjm-2018-0224] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
During a biodiversity survey of Trichoderma (Ascomycota, Hypocreales, Hypocreaceae) in coastal and lake wetlands of China, a new species, Trichoderma cyanodichotomus, was isolated from Dongting Lake wetland of Hunan province. The strain TW21990-1 was characterized as having two types of conidia and producing a distinct blue–green pigment on potato dextrose agar and cornmeal dextrose agar. The taxonomic position was analyzed using three molecular markers, internal transcribed spacer rDNA, translation elongation factor 1-alpha, and RNA polymerase II subunit B, revealing less than 95.0% homology with all known Trichoderma species. The combined phylogenetic tree further identified T. cyanodichotomus as an independent subgroup belonging to Section Pachybasium, with no close relatives. In vitro antagonistic activity by dual-culture assay exhibited broad inhibition against various plant pathogens, including Botryosphaeria dothidea, Pythium aphanidermatum, Rhizoctonia solani, and Verticillium dahliae. In addition, TW21990-1 demonstrated moderate hydrolase activity of cellulase, chitinase, β-1,3-glucanase, and protease, which might be involved in mycoparasitism. Greenhouse experiments showed strong biocontrol effects against tomato damping-off incited by P. aphanidermatum, together with increased seedling height and weight gain. The identification of T. cyanodichotomus will provide useful information for sufficient utilization of fungal resources.
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Affiliation(s)
- Jishun Li
- Ecology Institute, Qilu University of Technology (Shandong Academy of Sciences), Shandong Provincial Key Laboratory of Applied Microbiology, Jinan 250103, P.R. China
- Ecology Institute, Qilu University of Technology (Shandong Academy of Sciences), Shandong Provincial Key Laboratory of Applied Microbiology, Jinan 250103, P.R. China
| | - Yuanzheng Wu
- Ecology Institute, Qilu University of Technology (Shandong Academy of Sciences), Shandong Provincial Key Laboratory of Applied Microbiology, Jinan 250103, P.R. China
- Ecology Institute, Qilu University of Technology (Shandong Academy of Sciences), Shandong Provincial Key Laboratory of Applied Microbiology, Jinan 250103, P.R. China
| | - Kai Chen
- Ecology Institute, Qilu University of Technology (Shandong Academy of Sciences), Shandong Provincial Key Laboratory of Applied Microbiology, Jinan 250103, P.R. China
- Ecology Institute, Qilu University of Technology (Shandong Academy of Sciences), Shandong Provincial Key Laboratory of Applied Microbiology, Jinan 250103, P.R. China
| | - Yilian Wang
- Ecology Institute, Qilu University of Technology (Shandong Academy of Sciences), Shandong Provincial Key Laboratory of Applied Microbiology, Jinan 250103, P.R. China
- Ecology Institute, Qilu University of Technology (Shandong Academy of Sciences), Shandong Provincial Key Laboratory of Applied Microbiology, Jinan 250103, P.R. China
| | - Jindong Hu
- Ecology Institute, Qilu University of Technology (Shandong Academy of Sciences), Shandong Provincial Key Laboratory of Applied Microbiology, Jinan 250103, P.R. China
- Ecology Institute, Qilu University of Technology (Shandong Academy of Sciences), Shandong Provincial Key Laboratory of Applied Microbiology, Jinan 250103, P.R. China
| | - Yanli Wei
- Ecology Institute, Qilu University of Technology (Shandong Academy of Sciences), Shandong Provincial Key Laboratory of Applied Microbiology, Jinan 250103, P.R. China
- Ecology Institute, Qilu University of Technology (Shandong Academy of Sciences), Shandong Provincial Key Laboratory of Applied Microbiology, Jinan 250103, P.R. China
| | - Hetong Yang
- Ecology Institute, Qilu University of Technology (Shandong Academy of Sciences), Shandong Provincial Key Laboratory of Applied Microbiology, Jinan 250103, P.R. China
- Ecology Institute, Qilu University of Technology (Shandong Academy of Sciences), Shandong Provincial Key Laboratory of Applied Microbiology, Jinan 250103, P.R. China
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Hirpara DG, Gajera HP. Molecular heterozygosity and genetic exploitations of Trichoderma inter-fusants enhancing tolerance to fungicides and mycoparasitism against Sclerotium rolfsii Sacc. INFECTION GENETICS AND EVOLUTION 2018; 66:26-36. [PMID: 30219319 DOI: 10.1016/j.meegid.2018.09.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2018] [Revised: 09/04/2018] [Accepted: 09/11/2018] [Indexed: 11/29/2022]
Abstract
Protoplast fusion is an imperative tool to develop Trichoderma inter-fusants having desire traits through genetic manipulation. Study designed to develop diverse Trichoderma fusants for fungicide tolerance (Mancozeb, Thiram, Tebuconazole, and Carbendazim) and enhanced mycoparasitic activity against Sclerotium rolfsii sacc. The mycoparasitic T. virens NBAII Tvs12 and fungicide tolerant T. koningii MTCC 796 were utilized for protoplast fusion. The derived inter-fusants were subjected to diploidization using d-camphor in minimal media followed by successive three sub culturing onto potato dextrose agar to obtain 36 stable fusants. The stable fusants were employed for conidial size, fungicide tolerance, mycoparasitism, gene specific SSR amplification and molecular heterozygosity analysis. The results explained that 22 homozygous mutants illustrated characteristic of either one parental strain and 14 heterozygous recombinants depicted traits of both parental strains. The antagonistic activity of fusants against S. rolfsii depicted highest growth inhibition (87.91%) by potent inter-fusant (Fu 21) with improved fungicide tolerance capacity. The molecular study revealed highest observed heterozygocity (0.544), coefficient of gene differentiation (0.526) and gene flow (0.387) by Fu 21 indicating better genetic exploitation of parental strains into that fusant with good genetic purity. Principal coordinate analysis of fusants and parental strains exhibited 65.07% total variation and confirmed the scattering pattern matched with UPGMA clustering pattern. The stable heterozygous Fu 21 derived from inter-fusion between Tvs 12 and MTCC 796 might be useful to practice eco-friendly bioformulation tolerance to fungicides for effective integrated stem rot disease management in groundnut.
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Affiliation(s)
- Darshna G Hirpara
- Department of Biotechnology, College of Agriculture, Junagadh Agricultural University, Junagadh 362 001, Gujarat, India
| | - H P Gajera
- Department of Biotechnology, College of Agriculture, Junagadh Agricultural University, Junagadh 362 001, Gujarat, India.
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Zhang S, Xu B, Zhang J, Gan Y. Identification of the antifungal activity of Trichoderma longibrachiatum T6 and assessment of bioactive substances in controlling phytopathgens. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2018; 147:59-66. [PMID: 29933994 DOI: 10.1016/j.pestbp.2018.02.006] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2018] [Revised: 02/11/2018] [Accepted: 02/19/2018] [Indexed: 06/08/2023]
Abstract
Biological control with microbial antagonists is considered an alternative approach for controlling plant diseases. Trichoderma species are one of the potential fungal biocontrol agents in suppression of soil-borne pathogens. However, the mechanism and characterization of Trichoderma spp. in inhibiting different phytopathogenic fungi are largely unknown. In this study, we investigated the antagonistic potential of the endophytic fungus Trichoderma longibrachiatum T6 as a biocontrol agent against different phytopathogenic fungi and the associated antagonistic mechanism with bioactive substances. We found that the fermentation and crude extract of T. longibrachiatum T6 had a broad spectrum and potent activity inhibiting the growth of eleven phytopathogens evaluated, and of which, the inhibitory rate against Valsa mali reached 95% at 5 days after incubation. Ten fractions and six sub-fractions of bioactive substances were obtained on silica gel G chromatography and Sephadex LH-20 columns. One of the sub-fractions (coded sub-Fr.4f) exhibited highest inhibition against the pathogen V. mail, with the inhibitory rate of 80.64% at Day 5 of the treatment. Four key chemical inhibitors were identified: (i) 1, 2-Benzenedicarboxylicacid, bis (2-methylpropyl) ester (DIBP) (C16H22O4); (ii) (Z)-octadec-9-enoic acid (C18H34O2); (iii) 1, 2-Benzenedicarboxylic acid, mono (2-ethylhexyl) ester (MEHP) (C16H22O4); and (iv) (Z)-13-Docosenamide (C22H43NO), using spectroscopic and nuclear magnetic resonance data. Two fungicidal compounds DIBP and MEHP provided significantly greater antifungal activities than the other compounds in the inhibition of the V. mail growth. There was a significant linear relationship between the monomer compounds MEPH or DIBP and the inhibitory rates of V. mail; at the concentration of 200 μg mL-1, the inhibitory rate reached over 86% or 78%. We conclude that the strain of T. longibrachiatum T6 can serve as an effective biocontrol agent against V. mali and the mechanism for this function was due to the secondary metabolites with effective bioactive substance.
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Affiliation(s)
- Shuwu Zhang
- College of Plant protection, Gansu Agricultural University, Biocontrol Engineering Laboratory of Crop Diseases and Pests of Gansu Province, Lanzhou 730070, China; Gansu Provincial Key Laboratory of Arid Land Crop Science, Gansu Agricultural University, Lanzhou 730070, China
| | - Bingliang Xu
- College of Plant protection, Gansu Agricultural University, Biocontrol Engineering Laboratory of Crop Diseases and Pests of Gansu Province, Lanzhou 730070, China; Gansu Provincial Key Laboratory of Arid Land Crop Science, Gansu Agricultural University, Lanzhou 730070, China.
| | - Jianhua Zhang
- College of Plant protection, Gansu Agricultural University, Biocontrol Engineering Laboratory of Crop Diseases and Pests of Gansu Province, Lanzhou 730070, China
| | - Yantai Gan
- Agriculture and Agri-Food Canada, Swift Current Research and Development Centre, Swift Current, SK S9H 3X2, Canada
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Chen PH, Chou JY. Screening and Identification of Yeasts Antagonistic to Pathogenic Fungi Show a Narrow Optimal pH Range for Antagonistic Activity. Pol J Microbiol 2017; 66:101-106. [PMID: 29359688 DOI: 10.5604/17331331.1234997] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Microbes have evolved ways of interference competition to gain advantage over their ecological competitors. The use of secreted antagonistic compounds by yeast cells is one of the prominent examples. Although this killer behavior has been thoroughly studied in laboratory yeast strains, our knowledge of the antagonistic specificity of killer effects in nature remains limited. In this study, yeast strains were collected from various niches and screened for antagonistic activity against one toxin-sensitive strain of Saccharomyces cerevisiae and three pathogenic fungi. We demonstrate that some strains with antagonistic activity against these pathogenic fungi can be found in antagonist culture tests. These yeasts were identified as members of Trichosporon asahii, Candida stellimalicola, Wickerhamomyces anomalus, Ustilago esculenta, Aureobasidium pullulans, and Pichia kluyveri. The results indicated that the antagonistic activity of these killer yeasts has a narrow optimal pH range. Furthermore, we found that the antagonistic activity of some species is strain-dependent.
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Affiliation(s)
- Pei-Hua Chen
- Department of Biology, National Changhua University of Education, Changhua, Taiwan
| | - Jui-Yu Chou
- Department of Biology, National Changhua University of Education, Changhua, Taiwan
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Rai S, Kashyap PL, Kumar S, Srivastava AK, Ramteke PW. Identification, characterization and phylogenetic analysis of antifungal Trichoderma from tomato rhizosphere. SPRINGERPLUS 2016; 5:1939. [PMID: 27917337 PMCID: PMC5102998 DOI: 10.1186/s40064-016-3657-4] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/19/2016] [Accepted: 11/04/2016] [Indexed: 01/10/2023]
Abstract
The use of Trichoderma isolates with efficient antagonistic activity represents a potentially effective and alternative disease management strategy to replace health hazardous chemical control. In this context, twenty isolates were obtained from tomato rhizosphere and evaluated by their antagonistic activity against four fungal pathogens (Fusarium oxysporum f. sp. lycopersici, Alternaria alternata, Colletotrichum gloeosporoides and Rhizoctonia solani). The production of extracellular cell wall degrading enzymes of tested isolates was also measured. All the isolates significantly reduced the mycelial growth of tested pathogens but the amount of growth reduction varied significantly as well. There was a positive correlation between the antagonistic capacity of Trichoderma isolates towards fungal pathogens and their lytic enzyme production. The Trichoderma isolates were initially sorted according to morphology and based on the translation elongation factor 1-α gene sequence similarity, the isolates were designated as Trichoderma harzianum, T. koningii, T. asperellum, T. virens and T. viride. PCA analysis explained 31.53, 61.95, 62.22 and 60.25% genetic variation among Trichoderma isolates based on RAPD, REP-, ERIC- and BOX element analysis, respectively. ERG-1 gene, encoding a squalene epoxidase has been used for the first time for diversity analysis of antagonistic Trichoderma from tomato rhizosphere. Phylogenetic analysis of ERG-1 gene sequences revealed close relatedness of ERG-1sequences with earlier reported sequences of Hypocrea lixii, T. arundinaceum and T. reesei. However, ERG-1 gene also showed heterogeneity among some antagonistic isolates and indicated the possibility of occurrence of squalene epoxidase driven triterpene biosynthesis as an alternative biocontrol mechanism in Trichoderma species.
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Affiliation(s)
- Shalini Rai
- ICAR-National Bureau of Agriculturally Important Microorganisms (NBAIM), Mau, Uttar Pradesh 275103 India
| | - Prem Lal Kashyap
- ICAR-National Bureau of Agriculturally Important Microorganisms (NBAIM), Mau, Uttar Pradesh 275103 India
- ICAR-Indian Institute of Wheat and Barley Research (IIWBR), Regional Station, Flowerdale, Shimla, 171002 India
| | - Sudheer Kumar
- ICAR-Indian Institute of Wheat and Barley Research (IIWBR), Karnal, Haryana 132001 India
| | - Alok Kumar Srivastava
- ICAR-National Bureau of Agriculturally Important Microorganisms (NBAIM), Mau, Uttar Pradesh 275103 India
| | - Pramod W. Ramteke
- Sam Higginbottom Institute of Agriculture, Technology and Sciences (SHIATS), Allahabad, 211007 India
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Comparative analysis of microsatellites in five different antagonistic Trichoderma species for diversity assessment. World J Microbiol Biotechnol 2015; 32:8. [PMID: 26712623 DOI: 10.1007/s11274-015-1964-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2015] [Accepted: 10/14/2015] [Indexed: 12/30/2022]
Abstract
Microsatellites provide an ideal molecular markers system to screen, characterize and evaluate genetic diversity of several fungal species. Currently, there is very limited information on the genetic diversity of antagonistic Trichoderma species as determined using a range of molecular markers. In this study, expressed and whole genome sequences available in public database were used to investigate the occurrence, relative abundance and relative density of SSRs in five different antagonistic Trichoderma species: Trichoderma atroviride, T. harzianum, T. reesei, T. virens and T. asperellum. Fifteen SSRs loci were used to evaluate genetic diversity of twenty isolates of Trichoderma spp. from different geographical regions of India. Results indicated that relative abundance and relative density of SSRs were higher in T. asperellum followed by T. reesei and T. atroviride. Tri-nucleotide repeats (80.2%) were invariably the most abundant in all species. The abundance and relative density of SSRs were not influenced by the genome sizes and GC content. Out of eighteen primer sets, only 15 primer pairs showed successful amplification in all the test species. A total of 24 alleles were detected and five loci were highly informative with polymorphism information content values greater than 0.40, these markers provide useful information on genetic diversity and population genetic structure, which, in turn, can exploit for establishing conservation strategy for antagonistic Trichoderma isolates.
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Endophytic Trichoderma gamsii YIM PH30019: a promising biocontrol agent with hyperosmolar, mycoparasitism, and antagonistic activities of induced volatile organic compounds on root-rot pathogenic fungi of Panax notoginseng. J Ginseng Res 2015; 40:315-324. [PMID: 27746683 PMCID: PMC5052430 DOI: 10.1016/j.jgr.2015.09.006] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2015] [Revised: 09/23/2015] [Accepted: 09/25/2015] [Indexed: 02/04/2023] Open
Abstract
BACKGROUND Biocontrol agents are regarded as promising and environmental friendly approaches as agrochemicals for phytodiseases that cause serious environmental and health problems. Trichoderma species have been widely used in suppression of soil-borne pathogens. In this study, an endophytic fungus, Trichoderma gamsii YIM PH30019, from healthy Panax notoginseng root was investigated for its biocontrol potential. METHODS In vitro detached healthy roots, and pot and field experiments were used to investigate the pathogenicity and biocontrol efficacy of T. gamsii YIM PH30019 to the host plant. The antagonistic mechanisms against test phytopathogens were analyzed using dual culture, scanning electron microscopy, and volatile organic compounds (VOCs). Tolerance to chemical fertilizers was also tested in a series of concentrations. RESULTS The results indicated that T. gamsii YIM PH30019 was nonpathogenic to the host, presented appreciable biocontrol efficacy, and could tolerate chemical fertilizer concentrations of up to 20%. T. gamsii YIM PH30019 displayed antagonistic activities against the pathogenic fungi of P. notoginseng via production of VOCs. On the basis of gas chromatography-mass spectrometry, VOCs were identified as dimethyl disulfide, dibenzofuran, methanethiol, ketones, etc., which are effective ingredients for antagonistic activity. T. gamsii YIM PH30019 was able to improve the seedlings' emergence and protect P. notoginseng plants from soil-borne disease in the continuous cropping field tests. CONCLUSION The results suggest that the endophytic fungus T. gamsii YIM PH30019 may have a good potential as a biological control agent against notoginseng phytodiseases and can provide a clue to further illuminate the interactions between Trichoderma and phytopathogens.
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Zhang X, Harvey PR, Stummer BE, Warren RA, Zhang G, Guo K, Li J, Yang H. Antibiosis functions during interactions of Trichoderma afroharzianum and Trichoderma gamsii with plant pathogenic Rhizoctonia and Pythium. Funct Integr Genomics 2015; 15:599-610. [PMID: 26231513 DOI: 10.1007/s10142-015-0456-x] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2015] [Revised: 07/03/2015] [Accepted: 07/17/2015] [Indexed: 01/23/2023]
Abstract
Trichoderma afroharzianum is one of the best characterized Trichoderma species, and strains have been utilized as plant disease suppressive inoculants. In contrast, Trichoderma gamsii has only recently been described, and there is limited knowledge of its disease suppressive efficacies. Comparative studies of changes in gene expression during interactions of these species with their target plant pathogens will provide fundamental information on pathogen antibiosis functions. In the present study, we used complementary DNA amplified fragment length polymorphism (cDNA-AFLP) analysis to investigate changes in transcript profiling of T. afroharzianum strain LTR-2 and T. gamsii strain Tk7a during in vitro interactions with plant pathogenic Rhizoctonia solani and Pythium irregulare. Considerable differences were resolved in the overall expression profiles of strains LTR-2 and Tk7a when challenged with either plant pathogen. In strain LTR-2, previously reported mycoparasitism-related genes such as chitinase, polyketide synthase, and non-ribosomal peptide synthetase were found to be differentially expressed. This was not so for strain Tk7a, with the only previously reported antibiosis-associated genes being small secreted cysteine-rich proteins. Although only one differentially expressed gene was common to both strains LTR-2 and Tk7a, numerous genes reportedly associated with pathogen antibiosis processes were differentially expressed in both strains, including degradative enzymes and membrane transport proteins. A number of novel potential antibiosis-related transcripts were found from strains LTR-2 and Tk7a and remain to be identified. The expression kinetics of 20 Trichoderma (10 from strain LTR-2, 10 from strain Tk7a) transcript-derived fragments (TDFs) were quantified by quantitative reverse transcription PCR (RT-qPCR) at pre- and post-mycelia contact stages of Trichoderma-prey interactions, thereby confirming differential gene expression. Collectively, this research is providing information to elucidate the antibiosis mechanisms and disease suppressive activities of T. afroharzianum and T. gamsii against soilborne fungal and oomycete plant pathogens.
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Affiliation(s)
- Xinjian Zhang
- Shandong Provincial Key Laboratory of Applied Microbiology, Biotechnology Center, Shandong Academy of Sciences, Jinan, 250014, Shandong Province, People's Republic of China,
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Schöneberg A, Musa T, Voegele RT, Vogelgsang S. The potential of antagonistic fungi for control of Fusarium graminearum and Fusarium crookwellense varies depending on the experimental approach. J Appl Microbiol 2015; 118:1165-79. [PMID: 25692943 DOI: 10.1111/jam.12775] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Revised: 02/04/2015] [Accepted: 02/04/2015] [Indexed: 11/28/2022]
Abstract
AIMS To investigate the potential of fungal antagonists to control Fusarium head blight (FHB) causing pathogens (Fusarium graminearum and F. crookwellense) with two different experimental approaches. METHODS AND RESULTS Using two in vitro tests, Clonostachys rosea, Cladosporium cladosporioides and 10 Trichoderma strains were screened. In a co-culture assay, all Trichoderma strains significantly reduced the colony area of F. graminearum and F. crookwellense by 45-93%, whereas C. rosea and C. cladosporioides were not effective. In another assay, all antagonists from a chosen subset reduced the number of perithecia and ascospores on wheat straw by 88-100% when inoculated before the pathogen. Only C. rosea, a weak antagonist in the co-culture assay, was effective when inoculated after the pathogen, reducing perithecia and ascospore production by 73 and 100%, respectively. CONCLUSIONS For screening antagonists and to avoid sorting out highly effective strains, it is crucial to consider different experimental approaches since the efficacy might differ substantially depending on the incubation conditions. By using two distinct experimental set-ups, we identified promising biological control agents. SIGNIFICANCE AND IMPACT OF THE STUDY FHB is one of the most devastating fungal cereal diseases worldwide. As the pathogen overwinters on crop residues, application of antagonists on residues of the previous crop during harvest could be a promising approach to efficiently control FHB in cereals as an essential part of an integrated disease management.
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Affiliation(s)
- A Schöneberg
- Agroscope, Institute for Plant Production Sciences, Wädenswil, Switzerland
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Mayo S, Gutiérrez S, Malmierca MG, Lorenzana A, Campelo MP, Hermosa R, Casquero PA. Influence of Rhizoctonia solani and Trichoderma spp. in growth of bean (Phaseolus vulgaris L.) and in the induction of plant defense-related genes. FRONTIERS IN PLANT SCIENCE 2015; 6:685. [PMID: 26442006 PMCID: PMC4584982 DOI: 10.3389/fpls.2015.00685] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2015] [Accepted: 08/18/2015] [Indexed: 05/05/2023]
Abstract
Many Trichoderma species are well-known for their ability to promote plant growth and defense. We study how the interaction of bean plants with R. solani and/or Trichoderma affect the plants growth and the level of expression of defense-related genes. Trichoderma isolates were evaluated in vitro for their potential to antagonize R. solani. Bioassays were performed in climatic chambers and development of the plants was evaluated. The effect of Trichoderma treatment and/or R. solani infection on the expression of bean defense-related genes was analyzed by real-time PCR and the production of ergosterol and squalene was quantified. In vitro growth inhibition of R. solani was between 86 and 58%. In in vivo assays, the bean plants treated with Trichoderma harzianum T019 always had an increased size respect to control and the plants treated with this isolate did not decrease their size in presence of R. solani. The interaction of plants with R. solani and/or Trichoderma affects the level of expression of seven defense-related genes. Squalene and ergosterol production differences were found among the Trichoderma isolates, T019 showing the highest values for both compounds. T. harzianum T019 shows a positive effect on the level of resistance of bean plants to R. solani. This strain induces the expression of plant defense-related genes and produces a higher level of ergosterol, indicating its ability to grow at a higher rate in the soil, which would explain its positive effects on plant growth and defense in the presence of the pathogen.
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Affiliation(s)
- Sara Mayo
- Research Group of Engineering and Sustainable Agriculture, Natural Resources Institute, University of LeónLeón, Spain
| | - Santiago Gutiérrez
- Area of Microbiology, University School of Agricultural Engineers, University of LeónPonferrada, Spain
| | - Monica G. Malmierca
- Area of Microbiology, University School of Agricultural Engineers, University of LeónPonferrada, Spain
| | - Alicia Lorenzana
- Research Group of Engineering and Sustainable Agriculture, Natural Resources Institute, University of LeónLeón, Spain
| | - M. Piedad Campelo
- Research Group of Engineering and Sustainable Agriculture, Natural Resources Institute, University of LeónLeón, Spain
| | - Rosa Hermosa
- Department of Microbiology and Genetics, Spanish-Portuguese Centre for Agricultural Research, University of SalamancaSalamanca, Spain
| | - Pedro A. Casquero
- Research Group of Engineering and Sustainable Agriculture, Natural Resources Institute, University of LeónLeón, Spain
- *Correspondence: Pedro A. Casquero, Research Group of Engineering and Sustainable Agriculture, Natural Resources Institute, University of León, Av. Portugal 41, 24071 León, Spain
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Nath VS, John NS, Anjanadevi IP, Hegde VM, Jeeva ML, Misra RS, Veena SS. Characterization of Trichoderma spp. antagonistic to Phytophthora colocasiae associated with leaf blight of taro. ANN MICROBIOL 2014. [DOI: 10.1007/s13213-013-0794-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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Hassan MM. Influence of protoplast fusion between two Trichoderma spp. on extracellular enzymes production and antagonistic activity. BIOTECHNOL BIOTEC EQ 2014; 28:1014-1023. [PMID: 26019588 PMCID: PMC4434120 DOI: 10.1080/13102818.2014.978206] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2014] [Accepted: 07/09/2014] [Indexed: 11/13/2022] Open
Abstract
Biological control plays a crucial role in grapevine pathogens disease management. The cell-wall degrading enzymes chitinase, cellulase and β-glucanase have been suggested to be essential for the mycoparasitism activity of Trichoderma species against grapevine fungal pathogens. In order to develop a useful strain as a single source of these vital enzymes, it was intended to incorporate the characteristics of two parental fungicides tolerant mutants of Trichoderma belonging to the high chitinase producing species T. harzianum and the high cellulase producing species T. viride, by fusing their protoplasts. The phylogeny of the parental strains was carried out using a sequence of the 5.8S-ITS region. The BLAST of the obtained sequence identified these isolates as T. harzianum and T. viride. Protoplasts were isolated using lysing enzymes and were fused using polyethylene glycol. The fused protoplasts have been regenerated on protoplast regeneration minimal medium supplemented with two selective fungicides. Among the 40 fast growing fusants, 17 fusants were selected based on their enhanced growth on selective media for further studies. The fusant strains were growing 60%–70% faster than the parents up to third generation. All the 17 selected fusants exhibited morphological variations. Some fusant strains displayed threefold increased chitinase enzyme activity and twofold increase in β-glucanase enzyme activity compared to the parent strains. Most fusants showed powerful antagonistic activity against Macrophomin aphaseolina, Pythium ultimum and Sclerotium rolfsii pathogens. Fusant number 15 showed the highest inhibition percentage (92.8%) against M. phaseolina and P. ultimum, while fusant number 9 showed the highest inhibition percentage (98.2%) against the growth of S. rolfsii. A hyphal intertwining and degradation phenomenon was observed by scanning electron microscope. The Trichoderma antagonistic effect against pathogenic fungal mycelia was due to the mycoparasitism effect of the extracellular enzymes.
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Affiliation(s)
- Mohamed M Hassan
- Scientific Research Center, Biotechnology and Genetic Engineering Unit, Taif University , Taif , KSA ; Genetics Department, Faculty of Agriculture, Minufiya University , Shebin El-Kom , Egypt
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Schalchli H, Tortella GR, Rubilar O, Parra L, Hormazabal E, Quiroz A. Fungal volatiles: an environmentally friendly tool to control pathogenic microorganisms in plants. Crit Rev Biotechnol 2014; 36:144-52. [PMID: 25198437 DOI: 10.3109/07388551.2014.946466] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Fungi are an extraordinary and immensely diverse group of microorganisms that colonize many habitats even competing with other microorganisms. Fungi have received recognition for interesting metabolic activities that have an enormous variety of biotechnological applications. Previously, volatile organic compounds produced by fungi (FVOCs) have been demonstrated to have a great capacity for use as antagonist products against plant pathogens. However, in recent years, FVOCs have been received attention as potential alternatives to the use of traditional pesticides and, therefore, as important eco-friendly biotechnological tools to control plant pathogens. Therefore, highlighting the current state of knowledge of these fascinating FVOCs, the actual detection techniques and the bioactivity against plant pathogens is essential to the discovery of new products that can be used as biopesticides.
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Affiliation(s)
- H Schalchli
- a Scientific & Technological Bioresource Nucleus .,b Chemical Engineering Department , and
| | - G R Tortella
- a Scientific & Technological Bioresource Nucleus .,b Chemical Engineering Department , and
| | - O Rubilar
- a Scientific & Technological Bioresource Nucleus .,b Chemical Engineering Department , and
| | - L Parra
- a Scientific & Technological Bioresource Nucleus .,c Laboratorio de Química Ecológica, Departamento de Ciencias Químicas y Recursos Naturales , Universidad de La Frontera , Temuco , Chile
| | - E Hormazabal
- a Scientific & Technological Bioresource Nucleus .,c Laboratorio de Química Ecológica, Departamento de Ciencias Químicas y Recursos Naturales , Universidad de La Frontera , Temuco , Chile
| | - A Quiroz
- a Scientific & Technological Bioresource Nucleus .,c Laboratorio de Química Ecológica, Departamento de Ciencias Químicas y Recursos Naturales , Universidad de La Frontera , Temuco , Chile
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Phytohormone profiles induced by trichoderma isolates correspond with their biocontrol and plant growth-promoting activity on melon plants. J Chem Ecol 2014; 40:804-15. [PMID: 25023078 DOI: 10.1007/s10886-014-0478-1] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2014] [Revised: 06/23/2014] [Accepted: 07/01/2014] [Indexed: 10/25/2022]
Abstract
The application of Trichoderma strains with biocontrol and plant growth-promoting capacities to plant substrates can help reduce the input of chemical pesticides and fertilizers in agriculture. Some Trichoderma isolates can directly affect plant pathogens, but they also are known to influence the phytohormonal network of their host plant, thus leading to an improvement of plant growth and stress tolerance. In this study, we tested whether alterations in the phytohormone signature induced by different Trichoderma isolates correspond with their ability for biocontrol and growth promotion. Four Trichoderma isolates were collected from agricultural soils and were identified as the species Trichoderma harzianum (two isolates), Trichoderma ghanense, and Trichoderma hamatum. Their antagonistic activity against the plant pathogen Fusarium oxysporum f. sp. melonis was tested in vitro, and their plant growth-promoting and biocontrol activity against Fusarium wilt on melon plants was examined in vivo, and compared to that of the commercial strain T. harzianum T-22. Several growth- and defense-related phytohormones were analyzed in the shoots of plants that were root-colonized by the different Trichoderma isolates. An increase in auxin and a decrease in cytokinins and abscisic acid content were induced by the isolates that promoted the plant growth. Principal component analysis (PCA) was used to evaluate the relationship between the plant phenotypic and hormonal variables. PCA pointed to a strong association of auxin induction with plant growth stimulation by Trichoderma. Furthermore, the disease-protectant ability of the Trichoderma strains against F. oxysporum infection seems to be more related to their induced alterations in the content of the hormones abscisic acid, ethylene, and the cytokinin trans-zeatin riboside than to the in vitro antagonism activity against F. oxysporum.
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Alamri SA. The synergistic effect of two formulated biofungicides in the biocontrol of root and bottom rot of lettuce. Biocontrol Sci 2014; 19:189-97. [PMID: 25744215 DOI: 10.4265/bio.19.189] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
The aim of this study was to evaluate the synergistic effect of two formulated biofungicides (Rhizoleen-T and Rhizoleen-B) in the suppression of root and bottom rot of lettuce caused by Rhizoctonia solani, as well as the consequent effect on the phytosanitarian status of the plants.The results proved that application of the biofungicides either singly or in combination increased the germination and survival of the lettuce up to 61.67% and 100%, respectively. The phytosanitarian status of the plants, which was indicated by morphological and physiological parameters, was improved as the result of the application of the biofungicides. The noteworthy valuable result was the increase in fresh weight by 52.5% of the control when the two biofungicides were applied as a mixture. Interestingly, the mixture of the two biofungicides brought about a significant increase in most parameters compared to either of them in single preparation. Proline and phenols significantly increased as a result of the application of the biofungicides compared to the control. This means that the treated plants were more resistant against the pathogens. The study concludes that application of the biofungicides protects the lettuce plants against root and bottom rot, and in addition they increase the strength of the defense system of the plants. It is recommended that the application of a biofungicide mixture is a good and effective strategy in the biocontrol of plant diseases.
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Affiliation(s)
- Saad A Alamri
- Biology Department, Faculty of Science, King Khalid University
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Lopes FAC, Steindorff AS, Geraldine AM, Brandão RS, Monteiro VN, Lobo M, Coelho ASG, Ulhoa CJ, Silva RN. Biochemical and metabolic profiles of Trichoderma strains isolated from common bean crops in the Brazilian Cerrado, and potential antagonism against Sclerotinia sclerotiorum. Fungal Biol 2012; 116:815-24. [PMID: 22749168 DOI: 10.1016/j.funbio.2012.04.015] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2011] [Revised: 04/12/2012] [Accepted: 04/25/2012] [Indexed: 12/15/2022]
Abstract
Some species of Trichoderma have successfully been used in the commercial biological control of fungal pathogens, e.g., Sclerotinia sclerotiorum, an economically important pathogen of common beans (Phaseolus vulgaris L.). The objectives of the present study were (1) to provide molecular characterization of Trichoderma strains isolated from the Brazilian Cerrado; (2) to assess the metabolic profile of each strain by means of Biolog FF Microplates; and (3) to evaluate the ability of each strain to antagonize S. sclerotiorum via the production of cell wall-degrading enzymes (CWDEs), volatile antibiotics, and dual-culture tests. Among 21 isolates, we identified 42.86% as Trichoderma asperellum, 33.33% as Trichoderma harzianum, 14.29% as Trichoderma tomentosum, 4.76% as Trichoderma koningiopsis, and 4.76% as Trichoderma erinaceum. Trichoderma asperellum showed the highest CWDE activity. However, no species secreted a specific group of CWDEs. Trichoderma asperellum 364/01, T. asperellum 483/02, and T. asperellum 356/02 exhibited high and medium specific activities for key enzymes in the mycoparasitic process, but a low capacity for antagonism. We observed no significant correlation between CWDE and antagonism, or between metabolic profile and antagonism. The diversity of Trichoderma species, and in particular of T. harzianum, was clearly reflected in their metabolic profiles. Our findings indicate that the selection of Trichoderma candidates for biological control should be based primarily on the environmental fitness of competitive isolates and the target pathogen.
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Matarese F, Sarrocco S, Gruber S, Seidl-Seiboth V, Vannacci G. Biocontrol of Fusarium head blight: interactions between Trichoderma and mycotoxigenic Fusarium. MICROBIOLOGY-SGM 2011; 158:98-106. [PMID: 21980117 DOI: 10.1099/mic.0.052639-0] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Fusarium head blight (FHB) is a re-emerging wheat disease that causes extensive damage through direct losses in yield and quality due to the presence of damaged Fusarium kernels and their associated mycotoxins such as the trichothecene deoxynivalenol (DON). Biological control, including the treatment of crop residues with antagonists, in order to reduce pathogen inoculum of FHB, holds considerable promise. Ten Trichoderma isolates, previously selected for their ability to grow in the presence of DON, were preliminarily investigated as potential antagonists against Fusarium culmorum and F. graminearum mycotoxigenic strains in plate confrontation assays. The three Trichoderma isolates showing antibiosis and mycoparasitism were evaluated for their capacity to inhibit DON production by F. graminearum and F. culmorum on two natural substrates. The expression of some chitinase-encoding genes by the two best resulting Trichoderma strains, during interaction with F. culmorum and F. graminearum, was monitored. All investigated genes from chitinase subgroups A, B and the new subgroup C responded to mycoparasitic conditions and were upregulated before contact and/or when in contact with the host. T. gamsii 6085, the best antagonist, was finally used in a competition test against F. culmorum and F. graminearum on natural substrates, using a qPCR approach to evaluate its effect on the pathogen's growth and DON production in haulms and rice. This test confirmed the ability of T. gamsii 6085 to antagonize the pathogens on rice. On wheat haulms, an extreme oligotrophic environment, T. gamsii 6085 seemed to develop very poorly and the growth of both the pathogens was unaffected by the presence of the antagonist.
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Affiliation(s)
- F Matarese
- Department of Tree Science, Entomology and Plant Pathology 'G. Scaramuzzi', Section of Plant Pathology, Faculty of Agriculture, University of Pisa, Via del Borghetto 80, I-56124 Pisa, Italy
| | - S Sarrocco
- Department of Tree Science, Entomology and Plant Pathology 'G. Scaramuzzi', Section of Plant Pathology, Faculty of Agriculture, University of Pisa, Via del Borghetto 80, I-56124 Pisa, Italy
| | - S Gruber
- Research Area Gene Technology and Applied Biochemistry, Institute of Chemical Engineering, Vienna University of Technology, Gumpendorfer Straße 1a/166-5, 1060 Wien, Austria
| | - V Seidl-Seiboth
- Research Area Gene Technology and Applied Biochemistry, Institute of Chemical Engineering, Vienna University of Technology, Gumpendorfer Straße 1a/166-5, 1060 Wien, Austria
| | - G Vannacci
- Department of Tree Science, Entomology and Plant Pathology 'G. Scaramuzzi', Section of Plant Pathology, Faculty of Agriculture, University of Pisa, Via del Borghetto 80, I-56124 Pisa, Italy
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Fiers M, Edel-Hermann V, Héraud C, Gautheron N, Chatot C, Le Hingrat Y, Bouchek-Mechiche K, Steinberg C. Genetic diversity of Rhizoctonia solani associated with potato tubers in France. Mycologia 2011; 103:1230-44. [PMID: 21642342 DOI: 10.3852/10-231] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The soilborne fungus Rhizoctonia solani is a pathogen of many plants and causes severe damage in crops around the world. Strains of R. solani from the anastomosis group (AG) 3 attack potatoes, leading to great yield losses and to the downgrading of production. The study of the genetic diversity of the strains of R. solani in France allows the structure of the populations to be determined and adapted control strategies against this pathogen to be established. The diversity of 73 French strains isolated from tubers grown in the main potato seed production areas and 31 strains isolated in nine other countries was assessed by phylogenetic analyses of (i) the internal transcribed spacer sequences (ITS1 and ITS2) of ribosomal RNA (rRNA), (ii) a part of the gene tef-1α and (iii) the total DNA fingerprints of each strain established by amplified fragment length polymorphism (AFLP). The determination of the AGs of R. solani based on the sequencing of the ITS region showed three different AGs among our collection (60 AG 3 PT, 8 AG 2-1 and 5 AG 5). Grouping of the strains belonging to the same AG was confirmed by sequencing of the gene tef-1α used for the first time to study the genetic diversity of R. solani. About 42% of ITS sequences and 72% of tef-1α sequences contained polymorphic sites, suggesting that the cells of R. solani strains contain several copies of ITS and the tef-1α gene within the same nucleus or between different nuclei. Phylogenetic trees showed a greater genetic diversity within AGs in tef-1α sequences than in ITS sequences. The AFLP analyses showed an even greater diversity among the strains demonstrating that the French strains of R. solani isolated from potatoes were not a clonal population. Moreover there was no relationship between the geographical origins of the strains or the variety from which they were isolated and their genetic diversity.
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Affiliation(s)
- Marie Fiers
- INRA, Université de Bourgogne UMR 1229, Microbiologie du Sol et de l'Environnement, CMSE, 17 rue Sully, BP 86510, Dijon cedex 21065, France
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