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Hoheneder F, Steidele CE, Messerer M, Mayer KFX, Köhler N, Wurmser C, Heß M, Gigl M, Dawid C, Stam R, Hückelhoven R. Barley shows reduced Fusarium head blight under drought and modular expression of differentially expressed genes under combined stress. JOURNAL OF EXPERIMENTAL BOTANY 2023; 74:6820-6835. [PMID: 37668551 DOI: 10.1093/jxb/erad348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Accepted: 09/04/2023] [Indexed: 09/06/2023]
Abstract
Plants often face simultaneous abiotic and biotic stress conditions; however, physiological and transcriptional responses under such combined stress conditions are still not fully understood. Spring barley (Hordeum vulgare) is susceptible to Fusarium head blight (FHB), which is strongly affected by weather conditions. We therefore studied the potential influence of drought on FHB severity and plant responses in three varieties of different susceptibility. We found strongly reduced FHB severity in susceptible varieties under drought. The number of differentially expressed genes (DEGs) and strength of transcriptomic regulation reflected the concentrations of physiological stress markers such as abscisic acid or fungal DNA contents. Infection-related gene expression was associated with susceptibility rather than resistance. Weighted gene co-expression network analysis revealed 18 modules of co-expressed genes that reflected the pathogen- or drought-response in the three varieties. A generally infection-related module contained co-expressed genes for defence, programmed cell death, and mycotoxin detoxification, indicating that the diverse genotypes used a similar defence strategy towards FHB, albeit with different degrees of success. Further, DEGs showed co-expression in drought- or genotype-associated modules that correlated with measured phytohormones or the osmolyte proline. The combination of drought stress with infection led to the highest numbers of DEGs and resulted in a modular composition of the single-stress responses rather than a specific transcriptional output.
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Affiliation(s)
- Felix Hoheneder
- Chair of Phytopathology, TUM School of Life Sciences, HEF World Agricultural Systems Center, Technical University of Munich, Emil-Ramann Str. 2, 85354 Freising-Weihenstephan, Germany
| | - Christina E Steidele
- Chair of Phytopathology, TUM School of Life Sciences, HEF World Agricultural Systems Center, Technical University of Munich, Emil-Ramann Str. 2, 85354 Freising-Weihenstephan, Germany
| | - Maxim Messerer
- Plant Genome and Systems Biology, Helmholtz Center Munich, German Research Center for Environmental Health, Ingolstädter Landstraße 1, 85764 Neuherberg, Germany
| | - Klaus F X Mayer
- Plant Genome and Systems Biology, Helmholtz Center Munich, German Research Center for Environmental Health, Ingolstädter Landstraße 1, 85764 Neuherberg, Germany
| | - Nikolai Köhler
- Chair of Phytopathology, TUM School of Life Sciences, HEF World Agricultural Systems Center, Technical University of Munich, Emil-Ramann Str. 2, 85354 Freising-Weihenstephan, Germany
- LipiTUM, Chair of Experimental Bioinformatics, TUM School of Life Sciences, Technical University of Munich, Maximus-von-Imhof Forum 3, 85354 Freising-Weihenstephan, Germany
| | - Christine Wurmser
- Chair of Animal Physiology and Immunology, TUM School of Life Sciences, Technical University of Munich, Weihenstephaner Berg 3/I, 85354 Freising-Weihenstephan, Germany
| | - Michael Heß
- Chair of Phytopathology, TUM School of Life Sciences, HEF World Agricultural Systems Center, Technical University of Munich, Emil-Ramann Str. 2, 85354 Freising-Weihenstephan, Germany
| | - Michael Gigl
- Chair of Food Chemistry and Molecular Sensory Science, TUM School of Life Sciences, Technical University of Munich, Lise-Meitner-Straße 34, 85354 Freising-Weihenstephan, Germany
| | - Corinna Dawid
- Chair of Food Chemistry and Molecular Sensory Science, TUM School of Life Sciences, Technical University of Munich, Lise-Meitner-Straße 34, 85354 Freising-Weihenstephan, Germany
| | - Remco Stam
- Chair of Phytopathology, TUM School of Life Sciences, HEF World Agricultural Systems Center, Technical University of Munich, Emil-Ramann Str. 2, 85354 Freising-Weihenstephan, Germany
- Institute of Phytopathology, Christian Albrecht University of Kiel, Hermann-Rodewald-Straße 9, 24118 Kiel, Germany
| | - Ralph Hückelhoven
- Chair of Phytopathology, TUM School of Life Sciences, HEF World Agricultural Systems Center, Technical University of Munich, Emil-Ramann Str. 2, 85354 Freising-Weihenstephan, Germany
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Screening of Mycotoxigenic Fungi in Barley and Barley Malt (Hordeum vulgare L.) Using Real-Time PCR—A Comparison between Molecular Diagnostic and Culture Technique. Foods 2022; 11:foods11081149. [PMID: 35454736 PMCID: PMC9030328 DOI: 10.3390/foods11081149] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2022] [Revised: 04/08/2022] [Accepted: 04/14/2022] [Indexed: 12/10/2022] Open
Abstract
Filamentous fungi have a crucial impact on the food safety and technological quality of malting barley. Commonly used techniques for the detection of seed-borne fungi are based on cultivation and identification by morphological criteria. In contrast, this study established a quantitative real-time polymerase chain reaction (PCR) assay based on SYBR green technology for the detection and quantification of black fungal species (Alternaria spp., Epicoccum nigrum, Cladosporium cladosporioides, Penicillium verrucosum and Aspergillus niger) on brewing barley and compares it with the traditional cultivation technique and visual assessment. To screen the fungal spectrum over different barley varieties and harvest years, naturally infected samples of malting barley and corresponding malts (Hordeum vulgare L.) were analyzed over four consecutive years (2018–2021), grown under different climatic conditions in Germany. Alternaria and Cladosporium spp. DNA were present in all examined barley samples, even without visible contamination. In contrast, detection via culture-based methods does not reliably cover all species. Molecular analysis showed that there was less fungal biomass after malting, by 58.57% in the case of A. alternata, by 28.27% for Cladosporium spp. and by 12.79% for Epicoccum nigrum. Correlation analysis showed no causal relationship between fungal DNA and the number of black kernels. The qPCR provides a highly sensitive and time-saving screening method for detecting latent fungal infections in brewing grains to identify batches that are potentially highly contaminated with toxigenic fungi.
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Host Genotype and Weather Effects on Fusarium Head Blight Severity and Mycotoxin Load in Spring Barley. Toxins (Basel) 2022; 14:toxins14020125. [PMID: 35202152 PMCID: PMC8879614 DOI: 10.3390/toxins14020125] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 01/28/2022] [Accepted: 01/31/2022] [Indexed: 02/06/2023] Open
Abstract
Epidemiology of Fusarium Head Blight (FHB) of spring barley is relatively little understood. In a five-year study, we assessed quantitative resistance to FHB in an assortment of 17 spring barley genotypes in the field in southern Germany. To this end, we used soil and spray inoculation of plants with F. culmorum and F. avenaceum. This increased disease pressure and provoked genotypic differentiation. To normalize effects of variable weather conditions across consecutive seasons, we used a disease ranking of the genotypes based on quantification of fungal DNA contents and multiple Fusarium toxins in harvested grain. Together, this allowed for assessment of stable quantitative FHB resistance of barley in several genotypes. Fungal DNA contents were positively associated with species-specific Fusarium toxins in single years and over several years in plots with soil inoculation. In those plots, plant height limited FHB; however, this was not observed after spray inoculation. A multiple linear regression model of recorded weather parameter and fungal DNA contents over five years identified time periods during the reproductive phase of barley, in which weather strongly influenced fungal colonization measured in mature barley grain. Environmental conditions before heading and late after anthesis showed strongest associations with F. culmorum DNA in all genotypes, whereas for F. avenaceum, this was less consistent where we observed weather-dependent associations, depending on the genotype. Based on this study, we discuss aspects of practical resistance breeding in barley relevant to improve quantitative resistance to FHB and associated mycotoxin contaminations.
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Jubair S, Tucker JR, Henderson N, Hiebert CW, Badea A, Domaratzki M, Fernando WGD. GPTransformer: A Transformer-Based Deep Learning Method for Predicting Fusarium Related Traits in Barley. FRONTIERS IN PLANT SCIENCE 2021; 12:761402. [PMID: 34975945 PMCID: PMC8716695 DOI: 10.3389/fpls.2021.761402] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Accepted: 11/23/2021] [Indexed: 05/27/2023]
Abstract
Fusarium head blight (FHB) incited by Fusarium graminearum Schwabe is a devastating disease of barley and other cereal crops worldwide. Fusarium head blight is associated with trichothecene mycotoxins such as deoxynivalenol (DON), which contaminates grains, making them unfit for malting or animal feed industries. While genetically resistant cultivars offer the best economic and environmentally responsible means to mitigate disease, parent lines with adequate resistance are limited in barley. Resistance breeding based upon quantitative genetic gains has been slow to date, due to intensive labor requirements of disease nurseries. The production of a high-throughput genome-wide molecular marker assembly for barley permits use in development of genomic prediction models for traits of economic importance to this crop. A diverse panel consisting of 400 two-row spring barley lines was assembled to focus on Canadian barley breeding programs. The panel was evaluated for FHB and DON content in three environments and over 2 years. Moreover, it was genotyped using an Illumina Infinium High-Throughput Screening (HTS) iSelect custom beadchip array of single nucleotide polymorphic molecular markers (50 K SNP), where over 23 K molecular markers were polymorphic. Genomic prediction has been demonstrated to successfully reduce FHB and DON content in cereals using various statistical models. Herein, we have studied an alternative method based on machine learning and compare it with a statistical approach. The bi-allelic SNPs represented pairs of alleles and were encoded in two ways: as categorical (-1, 0, 1) or using Hardy-Weinberg probability frequencies. This was followed by selecting essential genomic markers for phenotype prediction. Subsequently, a Transformer-based deep learning algorithm was applied to predict FHB and DON. Apart from the Transformer method, a Residual Fully Connected Neural Network (RFCNN) was also applied. Pearson correlation coefficients were calculated to compare true vs. predicted outputs. Models which included all markers generally showed marginal improvement in prediction. Hardy-Weinberg encoding generally improved correlation for FHB (6.9%) and DON (9.6%) for the Transformer network. This study suggests the potential of the Transformer based method as an alternative to the popular BLUP model for genomic prediction of complex traits such as FHB or DON, having performed equally or better than existing machine learning and statistical methods.
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Affiliation(s)
- Sheikh Jubair
- Department of Computer Science, University of Manitoba, Winnipeg, MB, Canada
| | - James R. Tucker
- Department of Plant Science, University of Manitoba, Winnipeg, MB, Canada
- Brandon Research and Development Centre, Agriculture and Agri-Food Canada, Brandon, MB, Canada
| | - Nathan Henderson
- Brandon Research and Development Centre, Agriculture and Agri-Food Canada, Brandon, MB, Canada
| | - Colin W. Hiebert
- Morden Research and Development Centre, Agriculture and Agri-Food Canada, Morden, MB, Canada
| | - Ana Badea
- Department of Plant Science, University of Manitoba, Winnipeg, MB, Canada
- Brandon Research and Development Centre, Agriculture and Agri-Food Canada, Brandon, MB, Canada
| | - Michael Domaratzki
- Department of Computer Science, University of Western Ontario, London, ON, Canada
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Geißinger C, Gastl M, Becker T. Enzymes from Cereal and Fusarium Metabolism Involved in the Malting Process – A Review. JOURNAL OF THE AMERICAN SOCIETY OF BREWING CHEMISTS 2021. [DOI: 10.1080/03610470.2021.1911272] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Cajetan Geißinger
- Chair of Brewing and Beverage Technology, Technical University of Munich (TUM), Freising, Germany
| | - Martina Gastl
- Chair of Brewing and Beverage Technology, Technical University of Munich (TUM), Freising, Germany
| | - Thomas Becker
- Chair of Brewing and Beverage Technology, Technical University of Munich (TUM), Freising, Germany
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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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Abstract
Root rot diseases remain a major global threat to the productivity of agricultural crops. They are usually caused by more than one type of pathogen and are thus often referred to as a root rot complex. Fungal and oomycete species are the predominant participants in the complex, while bacteria and viruses are also known to cause root rot. Incorporating genetic resistance in cultivated crops is considered the most efficient and sustainable solution to counter root rot, however, resistance is often quantitative in nature. Several genetics studies in various crops have identified the quantitative trait loci associated with resistance. With access to whole genome sequences, the identity of the genes within the reported loci is becoming available. Several of the identified genes have been implicated in pathogen responses. However, it is becoming apparent that at the molecular level, each pathogen engages a unique set of proteins to either infest the host successfully or be defeated or contained in attempting so. In this review, a comprehensive summary of the genes and the potential mechanisms underlying resistance or susceptibility against the most investigated root rots of important agricultural crops is presented.
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Geißinger C, Whitehead I, Hofer K, Heß M, Habler K, Becker T, Gastl M. Influence of Fusarium avenaceum infections on barley malt: Monitoring changes in the albumin fraction of barley during the malting process. Int J Food Microbiol 2019; 293:7-16. [DOI: 10.1016/j.ijfoodmicro.2018.12.026] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Revised: 12/19/2018] [Accepted: 12/24/2018] [Indexed: 12/31/2022]
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9
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Rychlik M, Kanawati B, Schmitt-Kopplin P. Foodomics as a promising tool to investigate the mycobolome. Trends Analyt Chem 2017. [DOI: 10.1016/j.trac.2017.05.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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10
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Geißinger C, Hofer K, Habler K, Heß M, Hückelhoven R, Rychlik M, Becker T, Gastl M. Fusarium Species on Barley Malt: Is Visual Assessment an Appropriate Tool for Detection? Cereal Chem 2017. [DOI: 10.1094/cchem-08-16-0212-r] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Cajetan Geißinger
- Chair of Brewing and Beverage Technology, Technical University of Munich, Weihenstephaner Steig 20, 85354 Freising, Germany
| | - Katharina Hofer
- Chair of Phytopathology, Technical University of Munich, Emil-Ramann-Str. 2, 85354 Freising, Germany
| | - Katharina Habler
- Chair of Analytical Food Chemistry, Technical University of Munich, Alte Akademie 10, 85354 Freising, Germany
| | - Michael Heß
- Chair of Phytopathology, Technical University of Munich, Emil-Ramann-Str. 2, 85354 Freising, Germany
| | - Ralph Hückelhoven
- Chair of Phytopathology, Technical University of Munich, Emil-Ramann-Str. 2, 85354 Freising, Germany
| | - Michael Rychlik
- Chair of Analytical Food Chemistry, Technical University of Munich, Alte Akademie 10, 85354 Freising, Germany
| | - Thomas Becker
- Chair of Brewing and Beverage Technology, Technical University of Munich, Weihenstephaner Steig 20, 85354 Freising, Germany
| | - Martina Gastl
- Chair of Brewing and Beverage Technology, Technical University of Munich, Weihenstephaner Steig 20, 85354 Freising, Germany
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Habler K, Geissinger C, Hofer K, Schüler J, Moghari S, Hess M, Gastl M, Rychlik M. Fate of Fusarium Toxins during Brewing. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2017; 65:190-198. [PMID: 27931101 DOI: 10.1021/acs.jafc.6b04182] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Some information is available about the fate of Fusarium toxins during the brewing process, but only little is known about the single processing steps in detail. In our study we produced beer from two different barley cultivars inoculated with three different Fusarium species, namely, Fusarium culmorum, Fusarium sporotrichioides, and Fusarium avenaceum, producing a wide range of mycotoxins such as type B trichothecenes, type A trichothecenes, and enniatins. By the use of multi-mycotoxin LC-MS/MS stable isotope dilution methods we were able to follow the fate of Fusarium toxins during the entire brewing process. In particular, the type B trichothecenes deoxynivalenol, 3-acetyldeoxynivalenol, and 15-acetyldeoxynivalenol showed similar behaviors. Between 35 and 52% of those toxins remained in the beer after filtration. The contents of the potentially hazardous deoxynivalenol-3-glucoside and the type A trichothecenes increased during mashing, but a rapid decrease of deoxynivalenol-3-glucoside content was found during the following steps of lautering and wort boiling. The concentration of enniatins greatly decreased with the discarding of spent grains or finally with the hot break. The results of our study show the retention of diverse Fusarium toxins during the brewing process and allow for assessing the food safety of beer regarding the monitored Fusarium mycotoxins.
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Affiliation(s)
- Katharina Habler
- Chair of Analytical Food Chemistry, Technische Universität München , Alte Akademie 10, 85354 Freising, Germany
| | - Cajetan Geissinger
- Chair of Brewery and Beverage Technology, Technische Universität München , Weihenstephaner Steig 20, 85354 Freising, Germany
| | - Katharina Hofer
- Phytopathology, Technische Universität München , Emil Ramann Strasse 2, 85354 Freising, Germany
| | - Jan Schüler
- Chair of Analytical Food Chemistry, Technische Universität München , Alte Akademie 10, 85354 Freising, Germany
| | - Sarah Moghari
- Chair of Analytical Food Chemistry, Technische Universität München , Alte Akademie 10, 85354 Freising, Germany
| | - Michael Hess
- Phytopathology, Technische Universität München , Emil Ramann Strasse 2, 85354 Freising, Germany
| | - Martina Gastl
- Chair of Brewery and Beverage Technology, Technische Universität München , Weihenstephaner Steig 20, 85354 Freising, Germany
| | - Michael Rychlik
- Chair of Analytical Food Chemistry, Technische Universität München , Alte Akademie 10, 85354 Freising, Germany
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Hofer K, Geißinger C, König C, Gastl M, Hückelhoven R, Heß M, Coleman AD. Influence of Fusarium isolates on the expression of barley genes related to plant defense and malting quality. J Cereal Sci 2016. [DOI: 10.1016/j.jcs.2016.02.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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13
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Habler K, Hofer K, Geißinger C, Schüler J, Hückelhoven R, Hess M, Gastl M, Rychlik M. Fate of Fusarium Toxins during the Malting Process. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2016; 64:1377-1384. [PMID: 26813702 DOI: 10.1021/acs.jafc.5b05998] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Little is known about the fate of Fusarium mycotoxins during the barley malting process. To determine the fungal DNA and mycotoxin concentrations during malting, we used barley grain harvested from field plots that we had inoculated with Fusarium species that produce type A or type B trichothecenes or enniatins. Using a recently developed multimycotoxin liquid chromatography-tandem mass stable isotope dilution method, we identified Fusarium-species-specific behaviors of mycotoxins in grain and malt extracts and compared toxin concentrations to amounts of fungal DNA in the same samples. In particular, the type B trichothecenes and Fusarium culmorum DNA contents were increased dramatically up to 5400% after kilning. By contrast, the concentrations of type A trichothecenes and Fusarium sporotrichioides DNA decreased during the malting process. These data suggest that specific Fusarium species that contaminate the raw grain material might have different impacts on malt quality.
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Affiliation(s)
- Katharina Habler
- Chair of Analytical Food Chemistry, Technische Universität München , Alte Akademie 10, 85354 Freising, Germany
| | - Katharina Hofer
- Phytopathology, Technische Universität München , Emil Ramann Strasse 2, 85354 Freising, Germany
| | - Cajetan Geißinger
- Chair of Brewery and Beverage Technology, Technische Universität München , Weihenstephaner Steig 20, 85354 Freising, Germany
| | - Jan Schüler
- Chair of Analytical Food Chemistry, Technische Universität München , Alte Akademie 10, 85354 Freising, Germany
| | - Ralph Hückelhoven
- Phytopathology, Technische Universität München , Emil Ramann Strasse 2, 85354 Freising, Germany
| | - Michael Hess
- Phytopathology, Technische Universität München , Emil Ramann Strasse 2, 85354 Freising, Germany
| | - Martina Gastl
- Chair of Brewery and Beverage Technology, Technische Universität München , Weihenstephaner Steig 20, 85354 Freising, Germany
| | - Michael Rychlik
- Chair of Analytical Food Chemistry, Technische Universität München , Alte Akademie 10, 85354 Freising, Germany
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14
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Linkmeyer A, Hofer K, Rychlik M, Herz M, Hausladen H, Hückelhoven R, Hess M. Influence of inoculum and climatic factors on the severity of Fusarium head blight in German spring and winter barley. Food Addit Contam Part A Chem Anal Control Expo Risk Assess 2016; 33:489-99. [PMID: 26679010 DOI: 10.1080/19440049.2015.1133932] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Fusarium head blight (FHB) of small cereals is a disease of global importance with regard to economic losses and mycotoxin contamination harmful to human and animal health. In Germany, FHB is predominantly associated with wheat and F. graminearum is recognised as the major causal agent of the disease, but little is known about FHB of barley. Monitoring of the natural occurrence of FHB on Bavarian barley revealed differences for individual Fusarium spp. in incidence and severity of grain infection between years and between spring and winter barley. Parallel measurement of fungal DNA content in grain and mycotoxin content suggested the importance of F. graminearum in winter barley and of F. langsethiae in spring barley for FHB. The infection success of these two species was associated with certain weather conditions and barley flowering time. Inoculation experiments in the field revealed different effects of five Fusarium spp. on symptom formation, grain yield and mycotoxin production. A significant association between fungal infection of grain and mycotoxin content was observed following natural or artificial infection with the type B trichothecene producer F. culmorum, but not with the type A trichothecene-producing species F. langsethiae and F. sporotrichioides. Trichothecene type A toxin contamination also occurred in the absence of significant damage to grain and did not necessarily promote fungal colonisation.
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Affiliation(s)
- Andrea Linkmeyer
- a Phytopathology , Technische Universität München , Freising , Germany
| | - Katharina Hofer
- a Phytopathology , Technische Universität München , Freising , Germany
| | - Michael Rychlik
- b Analytical Food Chemistry , Technische Universität München , Freising , Germany.,c Bioanalytik Weihenstephan , Research Center for Food and Nutrition Sciences (ZIEL), Technische Universität München , Freising , Germany
| | - Markus Herz
- d Bavarian State Research Center for Agriculture , Barley Breeding IPZ 2b, Freising , Germany
| | - Hans Hausladen
- a Phytopathology , Technische Universität München , Freising , Germany
| | - Ralph Hückelhoven
- a Phytopathology , Technische Universität München , Freising , Germany
| | - Michael Hess
- a Phytopathology , Technische Universität München , Freising , Germany
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Hofer K, Linkmeyer A, Textor K, Hückelhoven R, Hess M. MILDEW LOCUS O Mutation Does Not Affect Resistance to Grain Infections with Fusarium spp. and Ramularia collo-cygni. PHYTOPATHOLOGY 2015; 105:1214-9. [PMID: 25871859 DOI: 10.1094/phyto-12-14-0381-r] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
MILDEW LOCUS O defines a major susceptibility gene for powdery mildew, and recessive mlo resistance alleles are widely used in breeding for powdery mildew resistance in spring barley. Barley powdery mildew resistance, which is conferred by mlo genes, is considered to be costly in terms of spontaneous defense reactions and enhanced susceptibility to cell-death-inducing pathogens. We assessed fungal infestation of barley (Hordeum vulgare) grain by measuring fungal DNA after natural infection with Fusarium spp. and Ramularia collo-cygni or after inoculation with Fusarium spp. in the field. Powdery-mildew-resistant mlo5 genotypes did not show enhanced Fusarium spp. or R. collo-cygni DNA content of grain over four consecutive years. Data add to our understanding of pleiotropic effects of mlo-mediated powdery mildew resistance and contributes to the discussion of whether or not application of barley mlo mutations may support pathogenesis of cell-death-inducing fungal pathogens under field conditions.
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Affiliation(s)
- Katharina Hofer
- Lehrstuhl für Phytopathologie, Technische Universität München, Emil-Ramann-Str. 2, D-85354 Freising, Germany
| | - Andrea Linkmeyer
- Lehrstuhl für Phytopathologie, Technische Universität München, Emil-Ramann-Str. 2, D-85354 Freising, Germany
| | - Katharina Textor
- Lehrstuhl für Phytopathologie, Technische Universität München, Emil-Ramann-Str. 2, D-85354 Freising, Germany
| | - Ralph Hückelhoven
- Lehrstuhl für Phytopathologie, Technische Universität München, Emil-Ramann-Str. 2, D-85354 Freising, Germany
| | - Michael Hess
- Lehrstuhl für Phytopathologie, Technische Universität München, Emil-Ramann-Str. 2, D-85354 Freising, Germany
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