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Funnell-Harris DL, Scully ED, Sattler SE, French RC, O'Neill PM, Pedersen JF. Differences in Fusarium Species in brown midrib Sorghum and in Air Populations in Production Fields. PHYTOPATHOLOGY 2017; 107:1353-1363. [PMID: 28686087 DOI: 10.1094/phyto-08-16-0316-r] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Several Fusarium spp. cause sorghum (Sorghum bicolor) grain mold, resulting in deterioration and mycotoxin production in the field and during storage. Fungal isolates from the air (2005 to 2006) and from leaves and grain from wild-type and brown midrib (bmr)-6 and bmr12 plants (2002 to 2003) were collected from two locations. Compared with the wild type, bmr plants have reduced lignin content, altered cell wall composition, and different levels of phenolic intermediates. Multilocus maximum-likelihood analysis identified two Fusarium thapsinum operational taxonomic units (OTU). One was identified at greater frequency in grain and leaves of bmr and wild-type plants but was infrequently detected in air. Nine F. graminearum OTU were identified: one was detected at low levels in grain and leaves while the rest were only detected in air. Wright's F statistic (FST) indicated that Fusarium air populations differentiated between locations during crop anthesis but did not differ during vegetative growth, grain development, and maturity. FST also indicated that Fusarium populations from wild-type grain were differentiated from those in bmr6 or bmr12 grain at one location but, at the second location, populations from wild-type and bmr6 grain were more similar. Thus, impairing monolignol biosynthesis substantially effected Fusarium populations but environment had a strong influence.
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Affiliation(s)
- Deanna L Funnell-Harris
- First, fourth, and fifth authors: Wheat, Sorghum and Forage Research Unit (WSFRU), United States Department of Agriculture-Agricultural Research Service (USDA-ARS), 251 Filley Hall, Department of Plant Pathology, University of Nebraska (UNL), Lincoln 68583-0937; second author: Stored Product Insect and Engineering Research Unit, USDA-ARS Center for Grain and Animal Health Research, Department of Entomology, Kansas State University, 1515 College Avenue, Manhattan 66502; and third and sixth authors: WSFRU, USDA-ARS, Departments of Agronomy and Horticulture, UNL
| | - Erin D Scully
- First, fourth, and fifth authors: Wheat, Sorghum and Forage Research Unit (WSFRU), United States Department of Agriculture-Agricultural Research Service (USDA-ARS), 251 Filley Hall, Department of Plant Pathology, University of Nebraska (UNL), Lincoln 68583-0937; second author: Stored Product Insect and Engineering Research Unit, USDA-ARS Center for Grain and Animal Health Research, Department of Entomology, Kansas State University, 1515 College Avenue, Manhattan 66502; and third and sixth authors: WSFRU, USDA-ARS, Departments of Agronomy and Horticulture, UNL
| | - Scott E Sattler
- First, fourth, and fifth authors: Wheat, Sorghum and Forage Research Unit (WSFRU), United States Department of Agriculture-Agricultural Research Service (USDA-ARS), 251 Filley Hall, Department of Plant Pathology, University of Nebraska (UNL), Lincoln 68583-0937; second author: Stored Product Insect and Engineering Research Unit, USDA-ARS Center for Grain and Animal Health Research, Department of Entomology, Kansas State University, 1515 College Avenue, Manhattan 66502; and third and sixth authors: WSFRU, USDA-ARS, Departments of Agronomy and Horticulture, UNL
| | - Roy C French
- First, fourth, and fifth authors: Wheat, Sorghum and Forage Research Unit (WSFRU), United States Department of Agriculture-Agricultural Research Service (USDA-ARS), 251 Filley Hall, Department of Plant Pathology, University of Nebraska (UNL), Lincoln 68583-0937; second author: Stored Product Insect and Engineering Research Unit, USDA-ARS Center for Grain and Animal Health Research, Department of Entomology, Kansas State University, 1515 College Avenue, Manhattan 66502; and third and sixth authors: WSFRU, USDA-ARS, Departments of Agronomy and Horticulture, UNL
| | - Patrick M O'Neill
- First, fourth, and fifth authors: Wheat, Sorghum and Forage Research Unit (WSFRU), United States Department of Agriculture-Agricultural Research Service (USDA-ARS), 251 Filley Hall, Department of Plant Pathology, University of Nebraska (UNL), Lincoln 68583-0937; second author: Stored Product Insect and Engineering Research Unit, USDA-ARS Center for Grain and Animal Health Research, Department of Entomology, Kansas State University, 1515 College Avenue, Manhattan 66502; and third and sixth authors: WSFRU, USDA-ARS, Departments of Agronomy and Horticulture, UNL
| | - Jeffrey F Pedersen
- First, fourth, and fifth authors: Wheat, Sorghum and Forage Research Unit (WSFRU), United States Department of Agriculture-Agricultural Research Service (USDA-ARS), 251 Filley Hall, Department of Plant Pathology, University of Nebraska (UNL), Lincoln 68583-0937; second author: Stored Product Insect and Engineering Research Unit, USDA-ARS Center for Grain and Animal Health Research, Department of Entomology, Kansas State University, 1515 College Avenue, Manhattan 66502; and third and sixth authors: WSFRU, USDA-ARS, Departments of Agronomy and Horticulture, UNL
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Abstract
The genus Fusarium includes numerous toxigenic species that are pathogenic to plants or humans, and are able to colonize a wide range of environments on earth. The genus comprises around 70 well-known species, identified by using a polyphasic approach, and as many as 300 putative species, according to phylogenetic species concepts; many putative species do not yet have formal names. Fusarium is one of the most economically important fungal genera because of yield loss due to plant pathogenic activity; mycotoxin contamination of food and feed products which often render them unaccep for marketing; and health impacts to humans and livestock, due to consumption of mycotoxins. Among the most important mycotoxins produced by species of Fusarium are the trichothecenes and the fumonisins. Fumonisins cause fatal livestock diseases and are considered potentially carcinogenic mycotoxins for humans, while trichothecenes are potent inhibitors of protein synthesis. This chapter summarizes the main aspects of morphology, pathology, and toxigenicity of the main Fusarium species that colonize different agricultural crops and environments worldwide, and cause mycotoxin contamination of food and feed.
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Nichea M, Cendoya E, Zachetti V, Chiacchiera S, Sulyok M, Krska R, Torres A, Chulze S, Ramirez M. Mycotoxin profile of Fusarium armeniacum isolated from natural grasses intended for cattle feed. WORLD MYCOTOXIN J 2015. [DOI: 10.3920/wmj2014.1770] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Fusarium armeniacum has been found as a saprophyte on natural grasses devoted to cattle feed in Argentina. This species has been reported as highly toxigenic due to the production of trichothecenes type A, but the information available about its toxigenic profile is incomplete. Thus, the aim of the present study was to determine the toxigenic ability of 50 F. armeniacum isolates recovered from natural grasses using a multitoxin method based on LC-MS/MS. In addition, morphological identification of 15 selected isolates was confirmed by sequencing the translation elongation factor 1α. Out of the 327 metabolites analysed, only 10 were detected: T-2 toxin (T-2), T-2 triol, T-2 tetraol, HT-2 toxin (HT-2), diacetoxyscirpenol (DAS), monoacetoxyscirpenol (MAS), neosolaniol (NEO), aurofusarin (AUF), beauvericin (BEA) and zearalenone (ZEA). The most common group of mycotoxins produced by the isolates on rice under laboratory conditions was trichothecenes type A, and some minor Fusarium mycotoxins, such as BEA and AUF. Some isolates were also able to produce ZEA. Among the trichothecene type A, HT-2, T-2, NEO were clearly synthesised at the highest levels and frequency, followed by DAS and MAS. HT-2, T-2, NEO and DAS production was detected in 48 (96%), 47 (94%), 47 (94%) and 38 (76%) isolates, respectively. The ability of F. armeniacum, to produce ZEA and AUF has been demonstrated here for the first time. Given the new information provided about the toxigenic profile of this species, commonly associated with natural grasses in Argentina, the threat to animal health posed by this fungus should not be underestimated.
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Affiliation(s)
- M.J. Nichea
- Departamento de Microbiología e Inmunología, Facultad de Ciencias Exactas Fco-Qcas y Naturales, Universidad Nacional de Rio Cuarto, Ruta 36 Km 601, 5800 Río Cuarto, Córdoba, Argentina
| | - E. Cendoya
- Departamento de Microbiología e Inmunología, Facultad de Ciencias Exactas Fco-Qcas y Naturales, Universidad Nacional de Rio Cuarto, Ruta 36 Km 601, 5800 Río Cuarto, Córdoba, Argentina
| | - V.G.L. Zachetti
- Departamento de Microbiología e Inmunología, Facultad de Ciencias Exactas Fco-Qcas y Naturales, Universidad Nacional de Rio Cuarto, Ruta 36 Km 601, 5800 Río Cuarto, Córdoba, Argentina
| | - S.M. Chiacchiera
- Departamento de Química, Facultad de Ciencias Exactas Fco-Qcas y Naturales, Universidad Nacional de Rio Cuarto, Ruta 36 Km 601, 5800 Río Cuarto, Córdoba, Argentina
| | - M. Sulyok
- Department IFA-Tulln, BOKU Vienna, Konrad Lorenzstr. 20, 3430 Tulln, Austria
| | - R. Krska
- Department IFA-Tulln, BOKU Vienna, Konrad Lorenzstr. 20, 3430 Tulln, Austria
| | - A.M. Torres
- Departamento de Microbiología e Inmunología, Facultad de Ciencias Exactas Fco-Qcas y Naturales, Universidad Nacional de Rio Cuarto, Ruta 36 Km 601, 5800 Río Cuarto, Córdoba, Argentina
| | - S.N. Chulze
- Departamento de Microbiología e Inmunología, Facultad de Ciencias Exactas Fco-Qcas y Naturales, Universidad Nacional de Rio Cuarto, Ruta 36 Km 601, 5800 Río Cuarto, Córdoba, Argentina
| | - M.L. Ramirez
- Departamento de Microbiología e Inmunología, Facultad de Ciencias Exactas Fco-Qcas y Naturales, Universidad Nacional de Rio Cuarto, Ruta 36 Km 601, 5800 Río Cuarto, Córdoba, Argentina
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Beadle J, Wright M, McNeely L, Bennett JW. Electrophoretic karyotype analysis in fungi. ADVANCES IN APPLIED MICROBIOLOGY 2004; 53:243-70. [PMID: 14696321 DOI: 10.1016/s0065-2164(03)53007-6] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The resolution of chromosomal-sized DNAs by PFGE has many applications that include karyotyping, strain identification of similar species, characterization of transformed strains, building of linkage maps, and preparation of DNA for genomic analysis. Successful electrophoretic separation of chromosomes is an empiric process in which the initial concentration of intact chromosome-sized DNA and the optimization of electrophoretic parameters are the most important experimental variables. Nonetheless, inherent attributes of the genome architecture of certain species may thwart success. When a karyotype contains numerous chromosomes of the same size and/or many large (greater than 8 Mb) chromosomes, no amount of manipulation of the electrophoretic parameters will resolve individual chromosome bands using present technology. Further, fungi display a surprising amount of intraspecific variation in both chromosome number and size, making it difficult to establish a standard "reference" karyotype for many species. Although PFGE is not a panacea for bringing genetics to species that lack classical genetic systems, it often does provide a way for developing a molecular linkage map in the absence of a formal genetic system. It is far faster than parasexual analysis in the discovery of linkage relationships. For genomics projects, DNA can be recovered from pulsed field gels and used to prepare chromosome-specific libraries. Where whole genome sequencing strategies are used, chromosomes separated by PFGE provide an anchor for sequencing data. Electrophoretic karyotypes can be probed with anonymous pieces of DNA from bacterial artificial chromosome (BAC) contigs, thereby facilitating the building of physical maps. In conclusion, despite its shortcomings, the PFGE technique underlies much of our current understanding of the physical nature of the fungal genome.
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Affiliation(s)
- J Beadle
- Department of Cell and Molecular Biology, Tulane University, New Orleans, LA 70118, USA
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Davière JM, Langin T, Daboussi MJ. Potential role of transposable elements in the rapid reorganization of the Fusarium oxysporum genome. Fungal Genet Biol 2001; 34:177-92. [PMID: 11728156 DOI: 10.1006/fgbi.2001.1296] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The activity of several families of transposable elements (TEs) in the genome of Fusarium oxysporum represents a potential source of karyotypic instability. We investigated transposon-mediated chromosome rearrangements by analyzing the karyotypes of a set of strains in which transposition events had occurred. We uncovered exceptional electrophoretic karyotype (EK) variability, in both number and size of chromosomal bands. We showed that EK differences result from chromosomal translocations, large deletions, and even more complex rearrangements. We also revealed many duplicated chromosomal regions. By following transposition of two elements and analyzing the distribution of different families of TEs on whole chromosomes, we find (i) no evidence of chromosomal breakages induced by transposition, (ii) a clustering of TEs in some regions, and (iii) a correlation between the high level of chromosomal polymorphism and the concentration of TEs. These results suggest that chromosome length polymorphisms likely result from ectopic recombination between TEs that can serve as substrates for these changes.
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Affiliation(s)
- J M Davière
- Institut de Génétique et Microbiologie, UMR 8621, Université Paris-Sud, Orsay Cedex, 91405, France
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