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| Ustilago maydis | |
|---|---|
| Name | Ustilago maydis |
| Regnum | Fungi |
| Divisio | Basidiomycota |
| Classis | Ustilaginomycetes |
| Ordo | Ustilaginales |
| Familia | Ustilaginaceae |
| Genus | Ustilago |
| Species | U. maydis |
Ustilago maydis is a basidiomycete fungal pathogen notable for causing corn smut on maize and for its roles in molecular genetics, plant pathology, and culinary traditions. Originally described in the 18th century, the organism has been a model for fungal dimorphism, host–pathogen signaling, and secondary metabolism studies, and its galls are consumed as a traditional food in Mexico and beyond. Research on this fungus intersects with agricultural institutions, molecular laboratories, and cultural organizations across the Americas and Europe.
The species was assigned within Basidiomycota by early mycologists associated with botanical gardens and museums in Europe, with taxonomic treatments appearing in works linked to the Royal Botanic Gardens, Kew, the Natural History Museum, London, and publications from the University of Göttingen. Nomenclatural clarifications and type specimen discussions have been published by researchers affiliated with the Botanical Society of America and the International Mycological Association, and have been cited in floras produced by the Smithsonian Institution and the New York Botanical Garden. Synonymy and classification debates involved comparisons with taxa described by authors connected to the Berlin Botanical Garden and the Royal Swedish Academy of Sciences.
Microscopic and macroscopic descriptions have been standardized in manuals used at the Max Planck Society institutes and described in laboratory protocols from the University of California, Berkeley and the University of Wisconsin–Madison. The fungus exhibits dikaryotic filamentous growth and produces black teliospores within hypertrophied host tissue, observations repeated in studies at the Johns Hopkins University and the University of Oxford. Culture techniques and mating assays reported by groups at the Salk Institute and the Massachusetts Institute of Technology detail transitions between yeast-like sporidia and infectious hyphae, and experimental work has been presented at meetings of the American Phytopathological Society.
Genome sequencing projects led by consortia involving the Broad Institute and university centers such as the University of Freiburg revealed compact genomes with gene clusters implicated in virulence and secondary metabolism, with analyses deposited in databases maintained by the European Molecular Biology Laboratory and the National Center for Biotechnology Information. Genetic mapping, mating-type locus characterization, and mutant collections have been developed in laboratories at the Heinrich Heine University Düsseldorf and the University of Arizona, and findings have been featured in journals associated with the American Society for Microbiology and the Royal Society of Biology. Comparative genomics contrasted loci with those studied by teams at the Max Planck Institute for Terrestrial Microbiology and the Chinese Academy of Sciences.
Mechanistic studies on effector proteins, host signaling suppression, and cell wall remodeling were advanced by collaborations involving the John Innes Centre and the Carnegie Institution for Science, with functional assays conducted in facilities at the University of Cambridge and the University of Toronto. Host specificity and compatibility factors have been examined in field trials coordinated with agricultural research centers such as the International Maize and Wheat Improvement Center and national institutes like the United States Department of Agriculture (USDA). Work on plant immune responses cited interactions with pathways studied by teams at the Max Planck Institute for Plant Breeding Research and the Agricultural Research Service.
Descriptions of galls, chlorosis, and kernel deformation appear in extension bulletins from the University of Illinois Extension and diagnostic guides from the Pennsylvania State University Extension, with photographic records curated by the Canadian Food Inspection Agency and the Food and Agriculture Organization. Diagnostic approaches integrating microscopy, culture, and PCR-based assays were developed in collaboration with laboratories at the Centers for Disease Control and Prevention and the European Food Safety Authority, and training modules have been provided by the CIMMYT and national plant protection organizations.
Epidemiological surveys and climate-related disease modeling have been led by researchers at the University of Florida, the University of Minnesota, and the International Potato Center, with regional reports produced by ministries of agriculture in Mexico, the United States, and Argentina. Studies of spore dispersal, overwintering, and reservoir hosts were published by teams associated with the Smithsonian Tropical Research Institute and the National Autonomous University of Mexico (UNAM), and ecological interactions with insect vectors and soil microbiota were investigated in projects funded by the European Commission and national science foundations.
Integrated management recommendations and cultivar resistance screening have been disseminated through programs at the USDA Agricultural Research Service and extension services at land-grant universities including the University of Nebraska–Lincoln and the University of California Cooperative Extension. Cultural control methods and sanitary measures were promoted in conjunction with the Food and Agriculture Organization and national plant protection agencies, while biochemical control and fungicide trials were undertaken by research groups at the Bayer CropScience and independent academic laboratories. Ethnobiological and culinary studies documenting traditional harvesting and culinary use—often termed a delicacy—have been conducted by scholars from the National Autonomous University of Mexico (UNAM) and culinary historians connected to institutions such as the Museum of Latin American Art.
Category:Fungal plant pathogens and diseases