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| Rhizoctonia | |
|---|---|
| Name | Rhizoctonia |
| Regnum | Fungi |
| Divisio | Basidiomycota |
| Ordo | Cantharellales |
| Familia | Ceratobasidiaceae |
| Genus | Rhizoctonia |
| Subdivision ranks | Species |
Rhizoctonia is a genus of anamorphic basidiomycete fungi noted for saprotrophic and pathogenic interactions with plants across agricultural and natural systems. Commonly implicated in damping-off, crown rot, and sheath blight, the group has been studied by plant pathologists, mycologists, and agronomists for its economic importance and complex life cycle. Research on Rhizoctonia intersects with institutes and events such as the Royal Botanic Gardens, Kew, United States Department of Agriculture, International Rice Research Institute, the Green Revolution, and programs at University of California, Davis and Iowa State University.
Taxonomic treatment of the group has evolved from classical morphology used by authorities like Giovanni Antonio Scopoli and Elias Magnus Fries to modern molecular phylogenetics employed by laboratories at The Sainsbury Laboratory and the Max Planck Society. Historically placed in teleomorphic genera such as Thanatephorus and Ceratobasidium, species concepts were revised following analyses using loci commonly applied in fungal systematics, including the Internal transcribed spacer, Large subunit ribosomal RNA gene, and protein-coding genes used in projects at Joint Genome Institute. Contemporary classification reflects multilocus phylogenies published in journals affiliated with societies like the Mycological Society of America and the British Mycological Society.
Rhizoctonia isolates lack airborne basidiospores in their anamorphic state and are instead characterized by multinucleate, septate hyphae and frequent formation of sclerotia; descriptions parallel observations from herbarium collections at Royal Botanic Gardens, Kew and microscopic protocols from American Phytopathological Society. The life cycle includes saprotrophic mycelial growth on organic matter, formation of hyphal anastomoses studied using methods from European Molecular Biology Laboratory, and occasional basidioma production under conditions used by researchers at Carnegie Institution for Science and Smithsonian Institution. Comparative developmental studies reference model organisms such as Ustilago maydis and Coprinopsis cinerea to interpret cellular differentiation, septation, and nuclear migration.
Members occupy a broad ecological spectrum from agricultural fields documented in reports by Food and Agriculture Organization to natural ecosystems surveyed by researchers at Smithsonian Tropical Research Institute and Australian National University. Geographic distribution records link to specimen databases curated by Royal Botanic Gardens, Kew, United States Department of Agriculture, National Center for Biotechnology Information, and herbaria at Harvard University Herbaria. Interactions include saprotrophy on crop residues, pathogenicity on hosts studied at International Maize and Wheat Improvement Center and symbiotic associations paralleling studies on mycorrhizae by teams at Wageningen University.
Rhizoctonia species cause diseases such as damping-off, root rot, and sheath blight with major impacts on crops including rice, wheat, soybean, potato, and turfgrass; economic assessments have been performed by agencies like Food and Agriculture Organization and extension services at University of California, Davis and Iowa State University. Outbreaks and management challenges have featured in policy discussions at United States Department of Agriculture and research programs at International Rice Research Institute and CIMMYT. Yield losses documented in reports from Agricultural Research Service and risk analyses by the European Food Safety Authority highlight the need for integrated strategies blending cultural practices recommended by extension systems affiliated with University of Nebraska–Lincoln and Pennsylvania State University.
Diagnostic workflows combine symptomology recorded by pathologists at American Phytopathological Society with laboratory techniques standardized by International Organization for Standardization and molecular assays developed at Cold Spring Harbor Laboratory and Sanger Institute. Tools include selective media protocols from collections at National Collection of Fungi, hyphal anastomosis grouping referenced in textbooks from Cambridge University Press, and PCR-based assays leveraging primers validated in studies affiliated with European Molecular Biology Laboratory and the Joint Genome Institute. Advanced diagnostics employ next-generation sequencing pipelines and bioinformatics resources maintained by National Center for Biotechnology Information and the European Bioinformatics Institute.
Integrated management recommendations synthesize cultural practices promoted by extension services at University of California, Davis and Iowa State University, resistant cultivar deployment from breeding programs at CIMMYT and International Rice Research Institute, and chemical controls evaluated by regulatory bodies such as Environmental Protection Agency and European Food Safety Authority. Biological control agents developed in research groups at Wageningen University and commercialized by biotech firms with ties to Bayer and Syngenta include antagonistic fungi and bacterial inoculants. Quarantine measures and phytosanitary standards applied through World Trade Organization agreements and World Organisation for Animal Health-linked protocols are used to limit pathogen spread.
Genomic resources include whole-genome sequencing projects archived at National Center for Biotechnology Information and comparative genomics efforts coordinated through consortia involving Joint Genome Institute and Wellcome Trust Sanger Institute. Studies of pathogenicity factors reference effector repertoires analyzed in laboratories at Sainsbury Laboratory and gene expression profiling techniques standardized at Cold Spring Harbor Laboratory. Population genetics, mating-type locus characterization, and horizontal gene transfer investigations have been reported in journals supported by American Phytopathological Society and collaborations with institutions such as University of Cambridge and ETH Zurich.
Category:Fungal plant pathogens and diseases