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| Alternaria | |
|---|---|
| Name | Alternaria |
| Taxon | Alternaria |
| Authority | Nees |
| Subdivision ranks | Species |
Alternaria is a cosmopolitan genus of filamentous fungi known for producing multicellular conidia and being a ubiquitous component of terrestrial and indoor microbiota. It is historically significant in mycology and plant pathology, implicated in large-scale crop losses and allergic diseases, and has been studied by researchers at institutions such as Smithsonian Institution, United States Department of Agriculture, and Max Planck Society. The genus has relevance to agriculture, public health, and biotechnology, intersecting with organizations like Food and Agriculture Organization and events such as the Green Revolution due to its impact on staple crops.
Alternaria belongs to the order Pleosporales within the class Dothideomycetes and has been revised through molecular studies led by groups at Harvard University, University of Cambridge, and University of Tokyo. Classical taxonomy relied on morphological characters described in works from the Royal Society and specimens held at institutions such as the Kew Gardens herbarium. Conidia are typically multicellular, beaked or ovoid, and produced on short conidiophores; these features were detailed in monographs by researchers associated with Royal Botanic Gardens, Kew, Smithsonian Institution, and the Natural History Museum, London. Phylogenetic revisions using ribosomal DNA and multilocus sequencing have been performed in laboratories at Cold Spring Harbor Laboratory, Wageningen University, and University of California, Davis.
Alternaria species occur worldwide, colonizing soil, plant debris, indoor dust, and air in environments surveyed by teams from World Health Organization, Centers for Disease Control and Prevention, and metropolitan studies in cities such as New York City, London, and Tokyo. They participate in decomposition processes documented in ecosystems studied by researchers at Scripps Institution of Oceanography and Smithsonian Tropical Research Institute, and are found on agricultural fields monitored by agencies like European Commission agriculture programs and the United States Department of Agriculture. Seasonal airborne concentrations have been mapped in studies coordinated with institutions such as NASA and National Aeronautics and Space Administration satellite projects for land-use analysis.
Numerous species affect a broad host range including cereals, vegetables, ornamentals, and fruit studied at Iowa State University, University of California, Riverside, and the International Rice Research Institute. Well-studied taxa cause diseases on hosts such as wheat, tomato, potato, soybean, and citrus evaluated in trials at CIMMYT, IRRI, and USDA ARS field stations. Host–pathogen interactions have been characterized in collaborations with John Innes Centre and Rothamsted Research, and host specificity patterns inform quarantine and biosecurity policies at European Food Safety Authority and national phytosanitary agencies.
Alternaria species are causal agents of leaf spots, blights, rots, and seedling damping-off as documented in extension publications from University of Florida, Cornell University, and Penn State University. Epidemics on economically important crops have been recorded in reports from Food and Agriculture Organization and historical crop loss assessments during periods studied by International Maize and Wheat Improvement Center researchers. Disease cycles, including sporulation and dispersal, were modeled in studies associated with Imperial College London and ETH Zurich to inform management strategies used by growers represented by organizations such as National Farmers Union.
Alternaria species are common aeroallergens implicated in asthma and allergic rhinitis in epidemiological studies by World Health Organization, Centers for Disease Control and Prevention, and clinical research at Mayo Clinic and Johns Hopkins University. Case reports of opportunistic infections in immunocompromised patients have been published in journals affiliated with Royal College of Physicians and medical centers like Massachusetts General Hospital. Veterinary impacts, including mycotoxicoses and cutaneous infections in livestock, have been investigated by researchers at Veterinary Research Institute and agricultural colleges such as Iowa State University College of Veterinary Medicine.
Detection methods include culture-based assays used in diagnostic labs at American Phytopathological Society member institutions, morphological keys in collections at Kew Gardens, and molecular diagnostics developed using PCR and sequencing by groups at Broad Institute, Sanger Institute, and university core facilities. Environmental monitoring employs air-sampling networks coordinated by municipal public health departments in cities like Los Angeles and Chicago, while regulatory testing for seed and produce is conducted by agencies such as United States Department of Agriculture and European Commission laboratory networks.
Integrated disease management recommendations combine cultural practices promoted by extension services at University of California Cooperative Extension, resistant cultivars developed at CIMMYT and IRRI, and fungicide programs informed by trials at Rothamsted Research and USDA ARS. Biological control research involves antagonists studied at Wageningen University & Research and commercial biocontrol firms, while postharvest sanitation and storage protocols are implemented in supply chains overseen by organizations such as International Trade Centre and supermarket chains like Tesco.
Alternaria species produce diverse secondary metabolites, including alternariols, tenuazonic acid, and other mycotoxins characterized in chemical analyses at Max Planck Institute for Chemical Ecology, ETH Zurich, and the National Institute of Health. Toxicological evaluations have been performed in collaborations with European Food Safety Authority, Food and Agriculture Organization, and toxicology laboratories at National Institutes of Health, informing risk assessments for food safety agencies and international standards organizations.