Epicoccum nigrum
Epicoccum nigrum | |
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E. nigrum growing on Lycoperdon pyriforme | |
Scientific classification | |
Kingdom: | |
Phylum: | |
Class: | Dothidiomycetes
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Order: | |
Family: | |
Genus: | |
Species: | E. nigrum
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Binomial name | |
Epicoccum nigrum Link
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Synonyms | |
Epicoccum purpurascens Ehrenb. |
Epicoccum nigrum is a species of fungus in the phylum Ascomycota. A plant pathogen and endophyte, it is a widespread fungus which produces coloured pigments that can be used as antifungal agents against other pathogenic fungi. The fluorescent stain epicocconone is extracted from it.
Growth and morphology[]
Epicoccum nigrum (1825) is a fungus with no known teleomorph form.[1] It has been classified as a member of the Hyphomycetes,[2] in the Deuteromycota, as well as the Fungi Imperfecti because it is only known to reproduce asexually. Despite that it is not yeast-like, it has been included in the broad, unrelated category of fungi known as black yeasts.[2] The fungus grows felty colonies in bright shades of yellow, orange, and red, often with brown or black throughout.[1][2] Colonies grow quickly, reaching about 6 cm in diameter in 2 days at room temperature.[1] Mycelia contain both chitin and cellulose.[1]
Epicoccum nigrum forms blastoconidia that are darkly coloured, warted and spherical, reaching 15 to 25 µm in diameter.[1] Conidia grow on a sporodochium, formed by warty and fibrous hyphae.[1][3] Sporets have been found to contain up to 15 cells.[4] The spores of E. nigrum are actively released depending on temperature, light, and relative humidity conditions.[5] The mechanism of release involves the separation of the conidium from the sporodochium via a double septum. It capitalizes on the spherical shape of the conidia, allowing it to "bounce" off the sporodochium.[6] Conidia then become airborne with movement or wind.[7] Sporulation is induced under Wood's light, or sometimes upon exposure to cold temperatures with a subsequent return to room temperature.[1] Pigment production is also sensitive to light and temperature changes.[8] Ideal growth temperatures range between 23–28 °C (73–82 °F), and ideal growth pH ranges from 5.0 to 6.0.[1] Although E. nigrum will grow in a range of water activity (aw of 0.99 to 0.97),[9] growth is optimized at water vapour saturation.[1]
Epicoccum nigrum produces a variety of biomedically and industrially useful metabolites, including important antifungal agents and pigments, including: flavipin, epicorazines A and B, epirodin, epicocconone, and a variety of carotenoid pigments.[10][11] Epicoccum nigrum has also been utilized in the biosynthetic manufacture of silver- and gold nanoparticles.[12][13]
Habitat and ecology[]
A highly robust and ubiquitous fungus,[14] E. nigrum has an almost global spread, occurring in the Americas, Asia, and Europe.[1] Spores of E. nigrum have been cultured from a variety of environments, predominantly soil (i.e. peat, forest floor, raw humus, compost, tundra, sewage)[1] and sand (e.g., dunes, saline sands).[1][15] It is a saprophytic fungus, forming pustules (composed of sporodochia and conidia) on dead and dying plants.[4] This species is commonly found growing on cereals and seeds, as well as other crops including corn, beans, potatoes, peas and peaches.[1][16] It has been found to grow colonies on leaves submersed in water as cold as 0 °C (32 °F), and is considered a facultative marine fungus.[17] It is capable of colonizing algae and marsh grasses.[17] In indoor environments, E. nigrum has been found on paintings and wallpaper,[18] cotton and textiles,[1][4] in dust,[16][18] and in air.[1][16][19][20] It is tolerant of changes in water availability, and hyphal growth has been found to resume within an hour of exposure to water.[17]
Biomedical, industrial, and agricultural uses[]
Epicoccum nigrum has a wide array of medical, industrial, and agricultural applications. It produces a variety of pigmented and non-pigmented antifungal and antibacterial compounds.[11][21] These antimicrobial compounds are effective against other fungi and bacteria present in soil.[11] Flavipin, and epirodins A and B are pigmented antifungal agents;[10][11] non-pigmented compounds include epicorazines A and B.[11] Endophytic fungi such as E. nigrum are being explored as alternative sources of antibiotics to treat important resistant infections.[22] Polysaccharide antioxidants are also produced by E. nigrum.[23] Epicocconone is a fluorescent pigment unique to E. nigrum.[24] Epicocconone is valuable in terms of its ability to pigment cells orange, which then fluoresce red without impacting cell structure or function.[24]
Industrially, E. nigrum has a variety of broad applications. It has demonstrated a capacity to biosynthesize nanoparticles from silver and gold, which have applications in chemical, industrial, and medical processes.[12][13] It has been applied as biological treatment for mechanical oily effluent, reducing the content of hydrogen peroxide, phenols, and chemical oxygen demand in the oily effluent.[25] Epicoccum nigrum pigments have been considered as natural replacements for artificial pigments currently used in food.[26] It produces a variety of pigments, ranging from darker oranges to yellows and greens.[26] These pigments were synthesized by nonpathogenic strains of E. nigrum.[26]
In Brazil, E. nigrum is used to support root growth and control sugarcane pathogens.[27] It is a biocontrol antifungal agent active against brown rot in stone fruit, caused the species Monilinia laxa and Monilinia fructigena.[28] In contrast to these uses for E. nigrum metabolites, there has been an investigation into methods of controlling E. nigrum fungal colonies that have contaminated historic and cultural artifacts.[29] The fungus was found to be quite sensitive to essential oils from plants such as lavender and rosemary.[29] This is important in terms of the preservation of artifacts in humid climates, where fungal growth is an important determinant in the deterioration of stone structures and wood frames.[29]
Epidemiology[]
Epicoccum nigrum produces the glycoprotein allergen Epi p 1 which binds to IgE, sometimes cross-reacting with other fungal allergens.[16] Cross-reactivity was found to exist with Alternaria alternata, Curvularia lunata, Cladosporium herbarum, and Penicillium citrinum.[30] Epicoccum nigrum is associated with respiratory fungal allergies, including allergic asthma, rhinitis, hypersensitivity pneumonitis, and allergic fungal sinusitis.[16][31] Two pediatric cases of hypersensitivity pneumonitis caused by E. nigrum were reported in children living in a damp and mouldy home, with daily exposure to E. nigrum in the shower.[32] The fungus has been found on human skin and in spit samples.[1] It does not typically cause systemic infection, although one case has been reported in an immunocompromised patient.[33]
History and reclassification[]
Epicoccum nigrum has been treated under a variety of names in the genus Epicoccum. It was first identified in 1815 by botanist Johaan Heinrich Friedrich Link.[34] Today, all previously identified species are considered to be different variants of the species E. nigrum.[4] These include: E. purpurascens, E. diversisporum, E. versicolor, E. vulgare, E. granulatum, E. menispermi, and E. neglectum.[4][34] More recently, two distinct genotypes for E. nigrum have been identified with the combined use of DNA sequencing, morphology, physiology, and recombination factors.[35] This indicates the existence of cryptic species, and a subsequent call to re-classify E. nigrum into more than one species.[35]
References[]
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- ^ Meredith, Donald S. (1966). "Diurnal periodicity and violent liberation of conidia in epicoccum". Phytopathology. 56: 988.
- ^ Webster, J. (June 1966). "Spore projection in Epicoccum and Arthrinium". Transactions of the British Mycological Society. 49 (2): 339–IN14. doi:10.1016/S0007-1536(66)80068-2.
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- ^ Gribanovski-Sassu, Olga; Foppen, F.H. (September 1968). "Light and temperature effect on Epicoccum nigrum". Phytochemistry. 7 (9): 1605–1612. doi:10.1016/S0031-9422(00)88613-6.
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- ^ a b Bamford, P.C.; Norris, G.L.F.; Ward, G. (September 1961). "Flavipin production by Epicoccum spp". Transactions of the British Mycological Society. 44 (3): 354–356. doi:10.1016/S0007-1536(61)80028-4.
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- ^ PUSZ, Wojciech; PLĄSKOWSKA, Elzbieta; YILDIRIM, İsmet; WEBER, Ryszard (2015). "Fungi occurring on the plants of the genus Amaranthus L." Turkish Journal of Botany. 39: 147–161. doi:10.3906/bot-1403-106.
- ^ Wilman, Karolina; Stępień, Łukasz; Fabiańska, Izabela; Kachlicki, Piotr (29 January 2014). "Plant-Pathogenic Fungi in Seeds of Different Pea Cultivars in Poland". Archives of Industrial Hygiene and Toxicology. 65 (3): 329–338. doi:10.2478/10004-1254-65-2014-2480. PMID 25205690.
- ^ Gribanovski-Sassu, Olga; Foppen, Fredrik H. (January 1967). "The carotenoids of the fungus Epicoccum nigrum link". Phytochemistry. 6 (6): 907–909. doi:10.1016/S0031-9422(00)86041-0.
- ^ Radić, Nataša; Štrukelj, Borut (November 2012). "Endophytic fungi—The treasure chest of antibacterial substances". Phytomedicine. 19 (14): 1270–1284. doi:10.1016/j.phymed.2012.09.007. PMID 23079233.
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- ^ a b Bell, Phillip J. L.; Karuso, Peterq (2003). "Epicocconone, A Novel Fluorescent Compound from the Fungus Epicoccum nigrum". Journal of the American Chemical Society. 125 (31): 9304–9305. doi:10.1021/ja035496+. PMID 12889954.
- ^ Queissada, Daniel Delgado; Silva, Flávio Teixeira da; Penido, Juliana Sundfeld; Siqueira, Carolina Dell'Aquila; Paiva, Tereza Cristina Brazil de (2013). "Epicoccum nigrum and Cladosporium sp. for the treatment of oily effluent in an air-lift reactor". Brazilian Journal of Microbiology. 44 (2): 607–612. doi:10.1590/S1517-83822013000200041. PMC 3833166. PMID 24294260.
- ^ a b c Mapari, Sameer A. S.; Meyer, Anne S.; Thrane, Ulf (16 July 2008). "Evaluation of Epicoccum nigrum for growth, morphology and production of natural colorants in liquid media and on a solid rice medium". Biotechnology Letters. 30 (12): 2183–2190. doi:10.1007/S10529-008-9798-y. PMID 18629439. S2CID 25396842.
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- ^ Bisht, Vandana; Singh, Bhanu Pratap; Arora, Naveen; Gaur, Shailendra Nath; Sridhara, Susheela (September 2002). "Antigenic and allergenic cross-reactivity of Epicoccum nigrum with other fungi". Annals of Allergy, Asthma & Immunology. 89 (3): 285–291. doi:10.1016/S1081-1206(10)61956-4. PMID 12269649.
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- Pleosporales
- Fungal plant pathogens and diseases
- Fungi described in 1816