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Epiphytic and Endophytic Fungi Colonizing Seeds of Two Poaceae Weed Species and Fusarium spp. Seed Degradation Potential In Vitro. Microorganisms 2023; 11:microorganisms11010184. [PMID: 36677476 PMCID: PMC9863844 DOI: 10.3390/microorganisms11010184] [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: 11/28/2022] [Revised: 01/09/2023] [Accepted: 01/09/2023] [Indexed: 01/15/2023] Open
Abstract
Fungi colonizing the surface and endosphere of two widespread Poaceae weed species, Avena fatua and Echinochloa crus-galli, were isolated to compare the taxonomic composition between the plant species, location, and year of the seed collection. The seed-degrading potential of Fusarium isolated from the seeds was tested by inoculating seeds of E. crus-galli with spore suspension. Molecular identification of epiphytic and endophytic fungal genera was performed by sequencing the ITS region of rDNA. Endophytes comprised of significantly lower fungal richness compared to epiphytes. A significant taxonomic overlap was observed between the endosphere and seed surface. The most abundant genera were Alternaria, Fusarium, Cladosporium, and Sarocladium. Analysis of similarities and hierarchical clustering showed that microbial communities were more dissimilar between the two plant species than between the years. Fusarium isolates with a high potential to infect and degrade E. crus-galli seeds in laboratory conditions belong to F. sporotrichioides and F. culmorum.
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Occurrence and Determination of Alternaria Mycotoxins Alternariol, Alternariol Monomethyl Ether, and Tentoxin in Wheat Grains by QuEChERS Method. Toxins (Basel) 2022; 14:toxins14110791. [PMID: 36422965 PMCID: PMC9695878 DOI: 10.3390/toxins14110791] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2022] [Revised: 10/29/2022] [Accepted: 11/10/2022] [Indexed: 11/16/2022] Open
Abstract
The Alternaria mycotoxins such as alternariol (AOH), alternariol monomethyl ether (AME), and tentoxin (TEN) are mycotoxins, which can contaminate cereal-based raw materials. Today, wheat is one of the most important crops in temperate zones, and it is in increasing demand in the Western Balkans countries that are urbanizing and industrializing. This research aimed to investigate the occurrence and determine the concentration of Alternaria mycotoxins AOH, AME, and TEN in wheat samples from the Republic of Serbia and the Republic of Albania, harvested in the year 2020 in the period between 15 June and 15 July. A total of 80 wheat grain samples, 40 from each country, were analyzed by an QuEChERS (quick, easy, cheap, effective, rugged, and safe) method. From the obtained results, it can be seen that the mean concentration of AOH was 3.3 µg/kg and AME was 2.2 µg/kg in wheat samples from Serbia, while TEN from both Serbia and Albania was under the limit of quantification (<LOQ). The maximum of AOH and AME mycotoxins was recorded only in wheat grain samples collected in the Republic of Serbia (5.3 and 2.3 µg/kg). In conclusion, Alternaria mycotoxins have concentrations above the LOQ, which could be potentially considered a health hazard to both humans and animals.
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Raatz L, Pirhofer Walzl K, Müller MEH, Scherber C, Joshi J. Who is the culprit: Is pest infestation responsible for crop yield losses close to semi-natural habitats? Ecol Evol 2021; 11:13232-13246. [PMID: 34646465 PMCID: PMC8495789 DOI: 10.1002/ece3.8046] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 07/30/2021] [Accepted: 08/03/2021] [Indexed: 11/16/2022] Open
Abstract
Semi-natural habitats (SNHs) are becoming increasingly scarce in modern agricultural landscapes. This may reduce natural ecosystem services such as pest control with its putatively positive effect on crop production. In agreement with other studies, we recently reported wheat yield reductions at field borders which were linked to the type of SNH and the distance to the border. In this experimental landscape-wide study, we asked whether these yield losses have a biotic origin while analyzing fungal seed and fungal leaf pathogens, herbivory of cereal leaf beetles, and weed cover as hypothesized mediators between SNHs and yield. We established experimental winter wheat plots of a single variety within conventionally managed wheat fields at fixed distances either to a hedgerow or to an in-field kettle hole. For each plot, we recorded the fungal infection rate on seeds, fungal infection and herbivory rates on leaves, and weed cover. Using several generalized linear mixed-effects models as well as a structural equation model, we tested the effects of SNHs at a field scale (SNH type and distance to SNH) and at a landscape scale (percentage and diversity of SNHs within a 1000-m radius). In the dry year of 2016, we detected one putative biotic culprit: Weed cover was negatively associated with yield values at a 1-m and 5-m distance from the field border with a SNH. None of the fungal and insect pests, however, significantly affected yield, neither solely nor depending on type of or distance to a SNH. However, the pest groups themselves responded differently to SNH at the field scale and at the landscape scale. Our findings highlight that crop losses at field borders may be caused by biotic culprits; however, their negative impact seems weak and is putatively reduced by conventional farming practices.
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Affiliation(s)
- Larissa Raatz
- Institute of Biochemistry and BiologyUniversität PotsdamUniversität PotsdamPotsdamGermany
- Leibniz Centre for Agricultural Landscape Research (ZALF) e.VMünchebergGermany
| | - Karin Pirhofer Walzl
- Leibniz Centre for Agricultural Landscape Research (ZALF) e.VMünchebergGermany
- Institute at Brown for Environment and SocietyBrown UniversityProvidenceRIUSA
- Berlin‐Brandenburg Institute of Advanced Biodiversity Research (BBIB)BerlinGermany
- Institute of BiologyFreie Universität BerlinBerlinGermany
| | - Marina E. H. Müller
- Leibniz Centre for Agricultural Landscape Research (ZALF) e.VMünchebergGermany
- Berlin‐Brandenburg Institute of Advanced Biodiversity Research (BBIB)BerlinGermany
| | - Christoph Scherber
- Zoological Research Museum Alexander Koenig (ZFMK)Centre for Biodiversity MonitoringBonnGermany
| | - Jasmin Joshi
- Berlin‐Brandenburg Institute of Advanced Biodiversity Research (BBIB)BerlinGermany
- Institute for Landscape and Open SpaceEastern Switzerland University of Applied SciencesJona‐RapperswilSwitzerland
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4
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Sumbula V, Kurian PS, Girija D, Cherian KA. Impact of foliar application of fungicides on tomato leaf fungal community structure revealed by metagenomic analysis. Folia Microbiol (Praha) 2021; 67:103-108. [PMID: 34554392 DOI: 10.1007/s12223-021-00920-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2021] [Accepted: 09/13/2021] [Indexed: 11/27/2022]
Abstract
Fungicides are commonly used to manage plant pathogens. However, little is known about their effects on the non-target fungal communities that inhabit inside and outside the plant. These fungicides may have adverse effects on beneficial microbial communities with possible consequences for plant health and productivity. Hence, a metagenomic approach, based on the ITS2 region of fungal rDNA, was used to study the impact of foliar application of two fungicides (propineb and iprodione + carbendazim) on non-target tomato leaf fungal communities, in the context of early blight disease management. Metagenomic analysis revealed that the richness and diversity of tomato leaf fungal populations were adversely affected by the chemical treatments tested. Among the two fungicides, propineb (contact fungicide) imparted less non-targeted microorganisms than iprodione + carbendazim (systemic fungicide). In addition, all samples showed association of pathogenic genera Cladosporium, Corynespora, Pseudocercospora along with early blight pathogen Alternaria on tomato leaves that otherwise were undetected. Metagenomic studies also revealed a new mode of action for fungicides and bioagents besides their direct effect that is shifting the microbial community structure so that it provides greater resistance against the pathogen.
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Affiliation(s)
- V Sumbula
- Division of Plant Pathology, Regional Agricultural Research Station, Kerala Agricultural University, Kerala, 679306, Pattambi, Palakkad, India.
| | - P Sainamole Kurian
- Department of Plant Pathology, College of Agriculture, Kerala Agricultural University, Kerala, India
| | - D Girija
- Department of Agricultural Microbiology, College of Agriculture, Kerala Agricultural University, Kerala, India
| | - K Anita Cherian
- Department of Plant Pathology, College of Agriculture, Kerala Agricultural University, Kerala, India
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Karlsson I, Persson P, Friberg H. Fusarium Head Blight From a Microbiome Perspective. Front Microbiol 2021; 12:628373. [PMID: 33732223 PMCID: PMC7956947 DOI: 10.3389/fmicb.2021.628373] [Citation(s) in RCA: 43] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Accepted: 02/08/2021] [Indexed: 11/25/2022] Open
Abstract
The fungal genus Fusarium causes several diseases in cereals, including Fusarium head blight (FHB). A number of Fusarium species are involved in disease development and mycotoxin contamination. Lately, the importance of interactions between plant pathogens and the plant microbiome has been increasingly recognized. In this review, we address the significance of the cereal microbiome for the development of Fusarium-related diseases. Fusarium fungi may interact with the host microbiome at multiple stages during their life cycles and in different plant organs including roots, stems, leaves, heads, and crop residues. There are interactions between Fusarium and other fungi and bacteria as well as among Fusarium species. Recent studies have provided a map of the cereal microbiome and revealed how different biotic and abiotic factors drive microbiome assembly. This review synthesizes the current understanding of the cereal microbiome and the implications for Fusarium infection, FHB development, disease control, and mycotoxin contamination. Although annual and regional variations in predominant species are significant, much research has focused on Fusarium graminearum. Surveying the total Fusarium community in environmental samples is now facilitated with novel metabarcoding methods. Further, infection with multiple Fusarium species has been shown to affect disease severity and mycotoxin contamination. A better mechanistic understanding of such multiple infections is necessary to be able to predict the outcome in terms of disease development and mycotoxin production. The knowledge on the composition of the cereal microbiome under different environmental and agricultural conditions is growing. Future studies are needed to clearly link microbiome structure to Fusarium suppression in order to develop novel disease management strategies for example based on conservation biological control approaches.
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Affiliation(s)
- Ida Karlsson
- Department of Crop Production Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden
| | - Paula Persson
- Department of Crop Production Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden
| | - Hanna Friberg
- Department of Forest Mycology and Plant Pathology, Swedish University of Agricultural Sciences, Uppsala, Sweden
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Hoffmann A, Lischeid G, Koch M, Lentzsch P, Sommerfeld T, Müller MEH. Co-Cultivation of Fusarium, Alternaria, and Pseudomonas on Wheat-Ears Affects Microbial Growth and Mycotoxin Production. Microorganisms 2021; 9:microorganisms9020443. [PMID: 33672702 PMCID: PMC7924320 DOI: 10.3390/microorganisms9020443] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Revised: 02/10/2021] [Accepted: 02/11/2021] [Indexed: 12/19/2022] Open
Abstract
Mycotoxigenic fungal pathogens Fusarium and Alternaria are a leading cause of loss in cereal production. On wheat-ears, they are confronted by bacterial antagonists such as pseudomonads. Studies on these groups’ interactions often neglect the infection process’s temporal aspects and the associated priority effects. In the present study, the focus was on how the first colonizer affects the subsequent ones. In a climate chamber experiment, wheat-ears were successively inoculated with two different strains (Alternaria tenuissima At625, Fusarium graminearum Fg23, or Pseudomonas simiae Ps9). Over three weeks, microbial abundances and mycotoxin concentrations were analyzed and visualized via Self Organizing Maps with Sammon Mapping (SOM-SM). All three strains revealed different characteristics and strategies to deal with co-inoculation: Fg23, as the first colonizer, suppressed the establishment of At625 and Ps9. Nevertheless, primary inoculation of At625 reduced all of the Fusarium toxins and stopped Ps9 from establishing. Ps9 showed priority effects in delaying and blocking the production of the fungal mycotoxins. The SOM-SM analysis visualized the competitive strengths: Fg23 ranked first, At625 second, Ps9 third. Our findings of species-specific priority effects in a natural environment and the role of the mycotoxins involved are relevant for developing biocontrol strategies.
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Affiliation(s)
- Annika Hoffmann
- Leibniz Centre for Agricultural Landscape Research (ZALF), 15374 Müncheberg, Germany; (G.L.); (P.L.); (M.E.H.M.)
- Institute for Horticultural Sciences, Humboldt-Universität zu Berlin, 14195 Berlin, Germany
- Berlin-Brandenburg Institute of Advanced Biodiversity Research (BBIB), 14195 Berlin, Germany
- Correspondence:
| | - Gunnar Lischeid
- Leibniz Centre for Agricultural Landscape Research (ZALF), 15374 Müncheberg, Germany; (G.L.); (P.L.); (M.E.H.M.)
- Berlin-Brandenburg Institute of Advanced Biodiversity Research (BBIB), 14195 Berlin, Germany
- Institute for Environmental Sciences and Geography, University of Potsdam, 14476 Potsdam, Germany
| | - Matthias Koch
- Bundesanstalt für Materialforschung und -prüfung (BAM), 12205 Berlin, Germany; (M.K.); (T.S.)
| | - Peter Lentzsch
- Leibniz Centre for Agricultural Landscape Research (ZALF), 15374 Müncheberg, Germany; (G.L.); (P.L.); (M.E.H.M.)
| | - Thomas Sommerfeld
- Bundesanstalt für Materialforschung und -prüfung (BAM), 12205 Berlin, Germany; (M.K.); (T.S.)
| | - Marina E. H. Müller
- Leibniz Centre for Agricultural Landscape Research (ZALF), 15374 Müncheberg, Germany; (G.L.); (P.L.); (M.E.H.M.)
- Berlin-Brandenburg Institute of Advanced Biodiversity Research (BBIB), 14195 Berlin, Germany
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7
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Castañares E, Pavicich MA, Dinolfo MI, Moreyra F, Stenglein SA, Patriarca A. Natural occurrence of Alternaria mycotoxins in malting barley grains in the main producing region of Argentina. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2020; 100:1004-1011. [PMID: 31646639 DOI: 10.1002/jsfa.10101] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2019] [Revised: 10/07/2019] [Accepted: 10/17/2019] [Indexed: 06/10/2023]
Abstract
BACKGROUND Barley (Hordeum vulgare L.) is one of the most important cereals worldwide, and its quality is affected by fungal contamination such as species of the genus Alternaria. No information is available about the occurrence of Alternaria mycotoxins in Argentinean barley grains, which is of concern, because they can be transferred into malt and beer. The aim of this study was to analyze the occurrence of alternariol (AOH), alternariol monomethyl ether (AME) and tenuazonic acid (TeA) in malting barley grains from the main producing region of Argentina during the 2014 and 2015 growing seasons. RESULTS The most frequent mycotoxin was AOH (64%), which was detected at higher levels (712 μg kg-1 ) compared with other studies, followed by TeA (37%, 1522 μg kg-1 ), while AME was present in five samples in the 2015 growing season only, with a mean of 4876 μg kg-1 . A similar frequency of mycotoxin occurrence was observed in both years (80.8 vs 85.3%), but more diverse contamination was found in 2015, which was characterized by lower accumulated precipitation. Nevertheless, AOH was more frequently found in 2014 than in 2015 (80.8 and 47.1% respectively). A negative correlation between AOH concentration and temperature was observed. The susceptibility of different barley varieties to mycotoxin accumulation varied with the mycotoxin, geographical location and meteorological conditions. CONCLUSION The results obtained in the present work represent a tool for risk assessment of exposition to these mycotoxins and could be used by food safety authorities to determine the need for their regulation. Furthermore, the establishment of a hazard analysis and critical control point (HACCP) system to minimize fungal and mycotoxin contamination in barley from farm to processing could be apply to ensure food safety. © 2019 Society of Chemical Industry.
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Affiliation(s)
- Eliana Castañares
- Laboratorio de Biología Funcional y Biotecnología (BIOLAB)-INBIOTEC-CONICET-CICBA, Facultad de Agronomía, UNCPBA, Azul, Buenos Aires, Argentina
| | - Maria A Pavicich
- Facultad de Ciencias Exactas y Naturales, Departamento de Química Orgánica, Laboratorio de Microbiología de Alimentos, CONICET, Instituto de Micología y Botánica (INMIBO), Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Maria I Dinolfo
- Laboratorio de Biología Funcional y Biotecnología (BIOLAB)-INBIOTEC-CONICET-CICBA, Facultad de Agronomía, UNCPBA, Azul, Buenos Aires, Argentina
| | - Federico Moreyra
- Estación Experimental Agropecuaria INTA Bordenave, Bordenave, Buenos Aires, Argentina
| | - Sebastián A Stenglein
- Laboratorio de Biología Funcional y Biotecnología (BIOLAB)-INBIOTEC-CONICET-CICBA, Facultad de Agronomía, UNCPBA, Azul, Buenos Aires, Argentina
| | - Andrea Patriarca
- Facultad de Ciencias Exactas y Naturales, Departamento de Química Orgánica, Laboratorio de Microbiología de Alimentos, CONICET, Instituto de Micología y Botánica (INMIBO), Universidad de Buenos Aires, Buenos Aires, Argentina
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8
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Crudo F, Varga E, Aichinger G, Galaverna G, Marko D, Dall'Asta C, Dellafiora L. Co-Occurrence and Combinatory Effects of Alternaria Mycotoxins and other Xenobiotics of Food Origin: Current Scenario and Future Perspectives. Toxins (Basel) 2019; 11:E640. [PMID: 31684145 PMCID: PMC6891783 DOI: 10.3390/toxins11110640] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Revised: 10/24/2019] [Accepted: 10/31/2019] [Indexed: 01/24/2023] Open
Abstract
Mycotoxins are low-molecular weight compounds produced by diverse genera of molds that may contaminate food and feed threatening the health of humans and animals. Recent findings underline the importance of studying the combined occurrence of multiple mycotoxins and the relevance of assessing the toxicity their simultaneous exposure may cause in living organisms. In this context, for the first time, this work has critically reviewed the most relevant data concerning the occurrence and toxicity of mycotoxins produced by Alternaria spp., which are among the most important emerging risks to be assessed in food safety, alone or in combination with other mycotoxins and bioactive food constituents. According to the literature covered, multiple Alternaria mycotoxins may often occur simultaneously in contaminated food, along with several other mycotoxins and food bioactives inherently present in the studied matrices. Although the toxicity of combinations naturally found in food has been rarely assessed experimentally, the data collected so far, clearly point out that chemical mixtures may differ in their toxicity compared to the effect of toxins tested individually. The data presented here may provide a solid foothold to better support the risk assessment of Alternaria mycotoxins highlighting the actual role of chemical mixtures on influencing their toxicity.
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Affiliation(s)
- Francesco Crudo
- Department of Food and Drug, University of Parma, Parco Area delle Scienze 27/A, 43124 Parma, Italy.
| | - Elisabeth Varga
- Department of Food Chemistry and Toxicology, Faculty of Chemistry, University of Vienna, Währinger Str. 38, 1090 Vienna, Austria.
| | - Georg Aichinger
- Department of Food Chemistry and Toxicology, Faculty of Chemistry, University of Vienna, Währinger Str. 38, 1090 Vienna, Austria.
| | - Gianni Galaverna
- Department of Food and Drug, University of Parma, Parco Area delle Scienze 27/A, 43124 Parma, Italy.
| | - Doris Marko
- Department of Food and Drug, University of Parma, Parco Area delle Scienze 27/A, 43124 Parma, Italy.
- Department of Food Chemistry and Toxicology, Faculty of Chemistry, University of Vienna, Währinger Str. 38, 1090 Vienna, Austria.
| | - Chiara Dall'Asta
- Department of Food and Drug, University of Parma, Parco Area delle Scienze 27/A, 43124 Parma, Italy.
| | - Luca Dellafiora
- Department of Food and Drug, University of Parma, Parco Area delle Scienze 27/A, 43124 Parma, Italy.
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Schiro G, Colangeli P, Müller MEH. A Metabarcoding Analysis of the Mycobiome of Wheat Ears Across a Topographically Heterogeneous Field. Front Microbiol 2019; 10:2095. [PMID: 31552005 PMCID: PMC6746991 DOI: 10.3389/fmicb.2019.02095] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2019] [Accepted: 08/26/2019] [Indexed: 12/12/2022] Open
Abstract
Plant associated microbial communities have recently received a lot of attention because thought to play a fundamental role in plant health and development. Focusing on cultivated crops, optimized farming practices must consider the role of these communities when aiming at reducing the impact of pathogens and increasing yields. Typical inhabitants of plant’s phyllosphere are bacteria and microscopic fungi, some of them pathogenic for the plant and dangerous for the consumers, due to the production of toxins. In order to efficiently manage the microbiome, the natural drivers regulating community assembly must be clearly understood. In our study we investigated the within field variation of the phyllosphere mycobiome of wheat ears by metabarcoding of the fungal internal transcribed sequence 1 (ITS1). We selected a field characterized by a high topographic heterogeneity, which is reflected in differences in plant productivity and fitness across it. Samples were taken from 30 sampling points laid across the field where data-loggers were placed, measuring the productivity driven under canopy microclimate. The microclimatic conditions were tested as a source of potential environmental variance. Further independent spatial structures were tested using spatial eigenvector maps (MEMs). Results show considerable differences in the phyllosphere composition across the field. The local under canopy environmental conditions at each point were strong predictors of the community composition. Independent spatial effects given by the geographical position of the sampling points showed also a weaker but significant effect. Moreover we observed different spatial responses from different fungal phyla, with results resembling those described in studies done at a regional scale. This study is the first one to investigate the spatial variation of the phyllosphere mycobiome of a commercial crop within the same field. It contributes to the study of the epidemiology and community assembly dynamics of wheat phyllosphere fungi, showing how in-field community variations are the results of different environmental and spatial processes acting simultaneously. It also shows how heterogeneous fields are a smart and useful system to investigate the ecological mechanisms regulating plant microbiome composition.
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Affiliation(s)
- Gabriele Schiro
- Leibniz Centre for Agricultural Landscape Research, Research Area 1 "Landscape Functioning", Müncheberg, Germany
| | | | - Marina E H Müller
- Leibniz Centre for Agricultural Landscape Research, Research Area 1 "Landscape Functioning", Müncheberg, Germany.,Berlin-Brandenburg Institute of Advanced Biodiversity Research (BBIB), Berlin, Germany
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10
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Schiro G, Müller T, Verch G, Sommerfeld T, Mauch T, Koch M, Grimm V, Müller MEH. The distribution of mycotoxins in a heterogeneous wheat field in relation to microclimate, fungal and bacterial abundance. J Appl Microbiol 2018; 126:177-190. [PMID: 30216614 DOI: 10.1111/jam.14104] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2018] [Revised: 08/25/2018] [Accepted: 08/29/2018] [Indexed: 12/24/2022]
Abstract
AIM To observe the variation in accumulation of Fusarium and Alternaria mycotoxins across a topographically heterogeneous field and tested biotic (fungal and bacterial abundance) and abiotic (microclimate) parameters as explanatory variables. METHODS AND RESULTS We selected a wheat field characterized by a diversified topography, to be responsible for variations in productivity and in canopy-driven microclimate. Fusarium and Alternaria mycotoxins where quantified in wheat ears at three sampling dates between flowering and harvest at 40 points. Tenuazonic acid (TeA), alternariol (AOH), alternariol monomethyl ether (AME), tentoxin (TEN), deoxynivalenol (DON), zearalenone (ZEN) and deoxynivalenol-3-Glucoside (DON.3G) were quantified. In canopy temperature, air and soil humidity were recorded for each point with data-loggers. Fusarium spp. as trichothecene producers, Alternaria spp. and fungal abundances were assessed using qPCR. Pseudomonas fluorescens bacteria were quantified with a culture based method. We only found DON, DON.3G, TeA and TEN to be ubiquitous across the whole field, while AME, AOH and ZEN were only occasionally detected. Fusarium was more abundant in spots with high soil humidity, while Alternaria in warmer and drier spots. Mycotoxins correlated differently to the observed explanatory variables: positive correlations between DON accumulation, tri 5 gene and Fusarium abundance were clearly detected. The correlations among the others observed variables, such as microclimatic conditions, varied among the sampling dates. The results of statistical model identification do not exclude that species coexistence could influence mycotoxin production. CONCLUSIONS Fusarium and Alternaria mycotoxins accumulation varies heavily across the field and the sampling dates, providing the realism of landscape-scale studies. Mycotoxin concentrations appear to be partially explained by biotic and abiotic variables. SIGNIFICANCE AND IMPACT OF THE STUDY We provide a useful experimental design and useful data for understanding the dynamics of mycotoxin biosynthesis in wheat.
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Affiliation(s)
- G Schiro
- Leibniz Centre for Agricultural Landscape Research (ZALF), Müncheberg, Germany
| | - T Müller
- Leibniz Centre for Agricultural Landscape Research (ZALF), Müncheberg, Germany
| | - G Verch
- Leibniz Centre for Agricultural Landscape Research (ZALF), Müncheberg, Germany
| | - T Sommerfeld
- Bundesanstalt für Materialforschung und -prüfung (BAM), Berlin, Germany
| | - T Mauch
- Bundesanstalt für Materialforschung und -prüfung (BAM), Berlin, Germany
| | - M Koch
- Bundesanstalt für Materialforschung und -prüfung (BAM), Berlin, Germany
| | - V Grimm
- Helmholtz Centre for Environmental Research (UFZ), Leipzig, Germany
| | - M E H Müller
- Leibniz Centre for Agricultural Landscape Research (ZALF), Müncheberg, Germany.,Berlin-Brandenburg Institute of Advanced Biodiversity Research (BBIB), Berlin, Germany
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11
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Schiro G, Verch G, Grimm V, Müller MEH. Alternaria and Fusarium Fungi: Differences in Distribution and Spore Deposition in a Topographically Heterogeneous Wheat Field. J Fungi (Basel) 2018; 4:E63. [PMID: 29795010 PMCID: PMC6023320 DOI: 10.3390/jof4020063] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2018] [Revised: 04/26/2018] [Accepted: 05/18/2018] [Indexed: 12/16/2022] Open
Abstract
Fusarium spp. and Alternaria spp., two genera of filamentous fungi, are common colonizers of the wheat phyllosphere. Both can be pathogenic and produce mycotoxins that are harmful to consumers. Their in-field infection dynamics have been a focus for the development of new control strategies. We analysed the abundance on plant ears and spore deposition patterns of Fusarium spp. and Alternaria spp. in a topographically heterogeneous field. Abundances were assessed genetically, using qPCR-based techniques, and passive spore traps were installed for quantifying the spore deposition at different plant heights. Data loggers were placed to measure the differences in microclimate across the field. Results indicate different distribution and spore deposition patterns for the two fungi. Fusarium spp. spore and genetic abundances were higher in spots with a more humid and colder under-canopy microclimate. Alternaria spp. showed the opposite trend for genetic abundance, while its spore deposition was not correlated to any of the microclimatic conditions and was more uniform across the field. Our study extends the knowledge on the dispersal and in-field infection dynamics of Fusarium spp. and Alternaria spp., important for a better understanding of the epidemiology of these wheat pathogens. It also illustrates that topographically heterogeneous fields are a suitable environment for studying the ecology of phyllosphere-colonizing fungi.
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Affiliation(s)
- Gabriele Schiro
- Leibniz Centre for Agricultural Landscape Research (ZALF), Eberswalder Str. 84, D-15374 Müncheberg, Germany.
| | - Gernot Verch
- Leibniz Centre for Agricultural Landscape Research (ZALF), Eberswalder Str. 84, D-15374 Müncheberg, Germany.
| | - Volker Grimm
- Department Ecological Modelling, Helmholtz Centre for Environmental Research (UFZ), Permoserstr. 15, D-04318 Leipzig, Germany.
| | - Marina E H Müller
- Leibniz Centre for Agricultural Landscape Research (ZALF), Eberswalder Str. 84, D-15374 Müncheberg, Germany.
- Berlin-Brandenburg Institute of Advanced Biodiversity Research (BBIB), Altensteinstr. 34, 14195 Berlin, Germany.
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Wei D, Wang Y, Jiang D, Feng X, Li J, Wang M. Survey of Alternaria Toxins and Other Mycotoxins in Dried Fruits in China. Toxins (Basel) 2017; 9:toxins9070200. [PMID: 28672847 PMCID: PMC5535147 DOI: 10.3390/toxins9070200] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2017] [Revised: 06/22/2017] [Accepted: 06/23/2017] [Indexed: 12/02/2022] Open
Abstract
Occurrence of toxigenic molds and mycotoxins on dried fruits is a worldwide problem, but limited information is available in China. A total of 220 dried fruits (raisins, dried apricots, dates and wolfberries) purchased from China were analyzed for 17 mycotoxins (i.e., Alternaria toxins, ochratoxin A (OTA), patulin (PAT) and trichothecenes) by UPLC-MS/MS, combined with a single-step cleanup. The result showed that at least one mycotoxin was detected in 142 samples (64.6%). The lowest incidence of contaminated samples was observed in dried apricots (48.2%), and the highest incidence in dried wolfberries (83.3%). The Alternaria toxins seemed to be the major problem in dried fruits, rather than OTA or PAT. Tenuazonic acid (TeA) was the predominant mycotoxin, in both frequency and concentration, ranging from 6.9 to 5665.3 μg kg−1, followed by tentoxin (TEN; 20.5%), and mycophenolic acid (MPA; 19.5%). Moreover, raisins are more likely to be contaminated with OTA than the other dried fruits. Penicillic acid (PA) was detected only in dried dates, and PAT was detected only in one apricot sample. In addition, our results also showed that the simultaneous presence of 2–4 mycotoxins was observed in 31.4% of dried fruits. TeA and TEN were the most frequent combination, detected in 29 (13.2%) samples, followed by TeA and MPA with a prevalence of 11.4%. Therefore, the results of this survey suggest the need for wider monitoring on the contamination of these mycotoxins, especially Alternaria toxins in agro-products, and indicate the importance of setting a maximum limit for Alternaria toxins in China.
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Affiliation(s)
- Dizhe Wei
- Beijing Research Center for Agricultural Standards and Testing, No. 9 Middle Road of Shuguanghuayuan, Haidian District, Beijing 100097, China.
- Risk Assessment Laboratory for Agro-Products, Ministry of Agriculture, No. 9 Middle Road of Shuguanghuayuan, Haidian District, Beijing 100097, China.
| | - Yao Wang
- Beijing Research Center for Agricultural Standards and Testing, No. 9 Middle Road of Shuguanghuayuan, Haidian District, Beijing 100097, China.
- Risk Assessment Laboratory for Agro-Products, Ministry of Agriculture, No. 9 Middle Road of Shuguanghuayuan, Haidian District, Beijing 100097, China.
| | - Dongmei Jiang
- Beijing Research Center for Agricultural Standards and Testing, No. 9 Middle Road of Shuguanghuayuan, Haidian District, Beijing 100097, China.
- Risk Assessment Laboratory for Agro-Products, Ministry of Agriculture, No. 9 Middle Road of Shuguanghuayuan, Haidian District, Beijing 100097, China.
| | - Xiaoyuan Feng
- Beijing Research Center for Agricultural Standards and Testing, No. 9 Middle Road of Shuguanghuayuan, Haidian District, Beijing 100097, China.
- Risk Assessment Laboratory for Agro-Products, Ministry of Agriculture, No. 9 Middle Road of Shuguanghuayuan, Haidian District, Beijing 100097, China.
| | - Jun Li
- Food Research Institute, Chinese Academy of Agricultural Sciences, No. 12 Zhongguancun South Street, Haidian District, Beijing 100081, China.
| | - Meng Wang
- Beijing Research Center for Agricultural Standards and Testing, No. 9 Middle Road of Shuguanghuayuan, Haidian District, Beijing 100097, China.
- Risk Assessment Laboratory for Agro-Products, Ministry of Agriculture, No. 9 Middle Road of Shuguanghuayuan, Haidian District, Beijing 100097, China.
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De Zutter N, Audenaert K, Ameye M, De Boevre M, De Saeger S, Haesaert G, Smagghe G. The plant response induced in wheat ears by a combined attack of Sitobion avenae aphids and Fusarium graminearum boosts fungal infection and deoxynivalenol production. MOLECULAR PLANT PATHOLOGY 2017; 18:98-109. [PMID: 26918628 PMCID: PMC6638299 DOI: 10.1111/mpp.12386] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2016] [Revised: 02/22/2016] [Accepted: 02/23/2016] [Indexed: 05/24/2023]
Abstract
The pathogen Fusarium graminearum, producer of the mycotoxin deoxynivalenol, and Sitobion avenae aphids both reside on wheat ears. We explored the influence of an earlier aphid infestation on the expression profile of specific molecular markers associated with F. graminearum infection. Using reverse transcription-quantitative polymerase chain reaction analysis, we followed the expression of wheat defence genes on S. avenae infestation and explored the effect on a subsequent F. graminearum infection. This was performed by the assessment of disease symptoms, fungal biomass, mycotoxin production and number of aphids at several time points during disease progress. Wheat ears infected with F. graminearum showed more disease symptoms and higher deoxynivalenol levels when ears were pre-exposed to aphids relative to a sole inoculation with F. graminearum. Aphids induced defence genes that are typically induced on F. graminearum infection. Other defence genes showed earlier and/or enhanced transcription after exposure to both aphids and F. graminearum. In the discussion, we link the symptomatic and epidemiological parameters with the transcriptional induction pattern in the plant. Our study suggests that pre-exposure of wheat ears to aphids affects the plant response, which plays a role in the subsequent attack of F. graminearum, enabling the fungus to colonize wheat ears more rapidly.
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Affiliation(s)
- Nathalie De Zutter
- Department of Crop ProtectionLaboratory of Agrozoology, Faculty of Bioscience Engineering, Ghent UniversityCoupure Links 6539000GhentBelgium
- Department of Applied BiosciencesFaculty of Bioscience Engineering, Ghent UniversityValentin Vaerwyckweg 19000GhentBelgium
| | - Kris Audenaert
- Department of Applied BiosciencesFaculty of Bioscience Engineering, Ghent UniversityValentin Vaerwyckweg 19000GhentBelgium
| | - Maarten Ameye
- Department of Crop ProtectionLaboratory of Agrozoology, Faculty of Bioscience Engineering, Ghent UniversityCoupure Links 6539000GhentBelgium
- Department of Applied BiosciencesFaculty of Bioscience Engineering, Ghent UniversityValentin Vaerwyckweg 19000GhentBelgium
| | - Marthe De Boevre
- Department of BioanalysisLaboratory of Food Analysis, Ghent UniversityOttergemsesteenweg 4609000GhentBelgium
| | - Sarah De Saeger
- Department of BioanalysisLaboratory of Food Analysis, Ghent UniversityOttergemsesteenweg 4609000GhentBelgium
| | - Geert Haesaert
- Department of Applied BiosciencesFaculty of Bioscience Engineering, Ghent UniversityValentin Vaerwyckweg 19000GhentBelgium
| | - Guy Smagghe
- Department of Crop ProtectionLaboratory of Agrozoology, Faculty of Bioscience Engineering, Ghent UniversityCoupure Links 6539000GhentBelgium
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Zwickel T, Kahl SM, Klaffke H, Rychlik M, Müller MEH. Spotlight on the Underdogs-An Analysis of Underrepresented Alternaria Mycotoxins Formed Depending on Varying Substrate, Time and Temperature Conditions. Toxins (Basel) 2016; 8:toxins8110344. [PMID: 27869760 PMCID: PMC5127140 DOI: 10.3390/toxins8110344] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2016] [Revised: 11/11/2016] [Accepted: 11/13/2016] [Indexed: 01/11/2023] Open
Abstract
Alternaria (A.) is a genus of widespread fungi capable of producing numerous, possibly health-endangering Alternaria toxins (ATs), which are usually not the focus of attention. The formation of ATs depends on the species and complex interactions of various environmental factors and is not fully understood. In this study the influence of temperature (7 °C, 25 °C), substrate (rice, wheat kernels) and incubation time (4, 7, and 14 days) on the production of thirteen ATs and three sulfoconjugated ATs by three different Alternaria isolates from the species groups A. tenuissima and A. infectoria was determined. High-performance liquid chromatography coupled with tandem mass spectrometry was used for quantification. Under nearly all conditions, tenuazonic acid was the most extensively produced toxin. At 25 °C and with increasing incubation time all toxins were formed in high amounts by the two A. tenuissima strains on both substrates with comparable mycotoxin profiles. However, for some of the toxins, stagnation or a decrease in production was observed from day 7 to 14. As opposed to the A. tenuissima strains, the A. infectoria strain only produced low amounts of ATs, but high concentrations of stemphyltoxin III. The results provide an essential insight into the quantitative in vitro AT formation under different environmental conditions, potentially transferable to different field and storage conditions.
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Affiliation(s)
- Theresa Zwickel
- Federal Institute for Risk Assessment (BfR), Max-Dohrn-Str 8-10, Berlin 10589, Germany.
- Technische Universität München, Chair of Analytical Food Chemistry, Alte Akademie 10, Freising 85354, Germany.
| | - Sandra M Kahl
- Leibniz-Centre for Agricultural Landscape Research (ZALF), Institute of Landscape Biogeochemistry, Eberswalder Str. 84, Müncheberg 15374, Germany.
- University of Potsdam, Maulbeerallee 1, Potsdam 14469, Germany.
| | - Horst Klaffke
- Federal Institute for Risk Assessment (BfR), Max-Dohrn-Str 8-10, Berlin 10589, Germany.
| | - Michael Rychlik
- Technische Universität München, Chair of Analytical Food Chemistry, Alte Akademie 10, Freising 85354, Germany.
| | - Marina E H Müller
- Leibniz-Centre for Agricultural Landscape Research (ZALF), Institute of Landscape Biogeochemistry, Eberswalder Str. 84, Müncheberg 15374, Germany.
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Xu W, Han X, Li F, Zhang L. Natural Occurrence of Alternaria Toxins in the 2015 Wheat from Anhui Province, China. Toxins (Basel) 2016; 8:E308. [PMID: 27792182 PMCID: PMC5127105 DOI: 10.3390/toxins8110308] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Revised: 10/08/2016] [Accepted: 10/19/2016] [Indexed: 12/11/2022] Open
Abstract
The exposure to Alternaria toxins from grain and grain-based products has been reported to be related to human esophageal cancer in China. In this study, a total of 370 freshly harvested wheat kernel samples collected from Anhui province of China in 2015 were analyzed for the four Alternaria toxins tenuazonic acid (TeA), tentoxin (TEN), alternariol (AOH) and alternariol monomethyl ether (AME) by high performance liquid chromatography-tandem mass spectrometry method (HPLC-MS/MS). TeA was the predominant toxin detected followed by TEN, AOH and AME. The concentrations of the four Alternaria toxins varied geographically. The samples from Fuyang district showed higher TEN concentration levels than the other regions studied (p < 0.05). Furthermore, 95% (352/370) of the wheat samples were positive for more than one type of Alternaria toxins. Positive correlation was observed between concentration levels of TeA and TEN, AOH and AME, TeA and AOH, and the total dibenzopyrone derivatives (AOH + AME) and TeA. Results indicate that there is a need to set the tolerance limit for Alternaria toxins in China, and more data on the contamination of these toxins in agro-products is required.
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Affiliation(s)
- Wenjing Xu
- Key Laboratory of Food Safety Risk Assessment, Ministry of Health, China National Center for Food Safety Risk Assessment, Beijing 100021, China.
- Institute of Nutrition and Food Hygiene, West China College of Public Health, Sichuan University, Chengdu 610041, China.
| | - Xiaomin Han
- Key Laboratory of Food Safety Risk Assessment, Ministry of Health, China National Center for Food Safety Risk Assessment, Beijing 100021, China.
| | - Fengqin Li
- Key Laboratory of Food Safety Risk Assessment, Ministry of Health, China National Center for Food Safety Risk Assessment, Beijing 100021, China.
| | - Lishi Zhang
- Institute of Nutrition and Food Hygiene, West China College of Public Health, Sichuan University, Chengdu 610041, China.
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