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Image of Fusarium wilt of Canary Island date palm

Fusarium Wilt Of Canary Island Date Palm

Fusarium oxysporum Schltdl. 1824

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Fusarium oxysporum f.sp. tulipae infects and damages live bulb of Tulipa

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Brief Summary

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The soil-borne ascomycete Fusarium oxysporum is a pathogenic fungus common in soils around the world, and the cause of fusarium wilt, a deadly vascular wilting syndrome in a large variety of plant species. Of particularly urgent threat currently is the Fusarium oxysporum f. sp. cubense; the “form” of this fungus that causes wilting disease, called Panama Disease, in bananas (although studies show that this form is composed of several divergent, polyphyletic lineages; O’Donnell et al. 1998).

As this fungus does not respond to fungicides nor is it effectively manageable by other treatments, this pathogen became the conduit for one of the most destructive plant diseases in history when it spread throughout the world (with the exception of a few South Pacific Islands) in the 1950s, devastating plantations of Gros Michele banana, the almost exclusively-farmed banana cultivar at that time.The banana industry recovered only by converting to the production of Cavendash bananas, a generally F. oxysporum-resistant strain, as a substitute to Gros Michele (Butler 2013; IITA Press Release 2013; Plant Health Australia 2013; García-Bastidas et al. 2014; Wikipedia 2014b).

Banana plantations are now again seriously threatened, as the Cavendash is susceptible to a new variant of F. oxysporum f. sp. cubense termed Tropical Race 4 (Foc TR4).First identified in Asia in 1992, it subsequently spread to the Philippines and to Northern Australia.In 2013 TR4 was identified in Jordan and Mozambique, creating intense concern for its inevitable spread into banana producing countries in Africa and South America.Hygiene to reduce the spread of the fungus and transgenic techniques to introduce resistance genes into Cavendash bananas are tools researchers hope will save the industry this time (Butler 2013; IITA Press Release 2013; Plant Health Australia 2013; García-Bastidas et al. 2014; Wikipedia 2014b).

Fusarium oxysporum attacks its host by entering through the root.It grows in the plant xylem, eventually blocking the vascular system.This prevents transport of water and nutrients to the rest of the host, causing wilting, discoloration, and ultimately death of the plant (Gonsalves and Ferreira, 1993; Wikipedia 2014a).The leaves on an infected banana plant remain erect for 1 to 2 weeks as they start yellowing, then collapse at the leaf stalk so they hang down at the pseudostem and wither (Infonet Biovision 2011; Ploetz 2000).

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Brief Summary

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Fusarium oxysporum Schlecht. as emended by Snyder and Hansen [1] comprises all the species, varieties and forms recognized by Wollenweber and Reinking [2] within an infrageneric grouping called section Elegans. While the species, as defined by Snyder and Hansen, has been widely accepted for more than 50 years [3][4], more recent work indicates this taxon is actually a genetically heterogeneous polytypic morphospecies [5][6] whose strains represent some of the most abundant and widespread microbes of the global soil microflora [7], although this last statement has not been proven or supported by actual data. These remarkably diverse and adaptable fungi have been found in soils ranging from the Sonoran Desert, to tropical and temperate forests, grasslands and soils of the tundra [8]. F. oxysporum strains are ubiquitous soil inhabitants that have the ability to exist as saprophytes, and degrade lignin [9][10] and complex carbohydrates [11][12][13] associated with soil debris. They are also pervasive plant endophytes that can colonize plant roots [14][15] and may even protect plants or be the basis of disease suppression [16][17.] Although the predominant role of these fungi in native soils may be as harmless or even beneficial plant endophytes or soil saprophytes, many strains within the F. oxysporum complex are pathogenic to plants, especially in agricultural settings.

Pathogenic strains of F. oxysporum have been studied for more than 100 years. The host range of these fungi is extremely broad, and includes animals, ranging from arthropods [18] to humans [19], as well as plants, including a range of both gymnosperms and angiosperms. While collectively, plant pathogenic F. oxysporum strains have a broad host range, individual isolates usually cause disease only on a narrow range of plant species. This observation has led to the idea of "special form" or forma speciales in F. oxysporum. Formae speciales have been defined as "...an informal rank in Classification.....used for parasitic fungi characterized from a physiological standpoint (e.g. by the ability to cause disease in particular hosts) but scarcely or not at all from a morphological standpoint. As a category, forma specialis is mentioned in, but not regulated by, the International Code of Botanical Nomenclature and sometimes it has been inconsistently applied. Exhaustive host range studies also have been conducted for relatively few formae speciales or F. oxysporum[20]. For more information on Fusarium oxysporum as a plant pathogen, see Fusarium wilt. Different strains of F. oxysporum have been used in the purpose of producing nanomaterials (especially Silver nanoparticles).

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Brief Summary

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The soil-borne ascomycete Fusarium oxysporum is a pathogenic fungus common in soils around the world, and the cause of fusarium wilt, a deadly vascular wilting syndrome in plants. Fusarium oxysporum comprises over 120 known strains or “special forms” (formae speciales; f. sp.), each of which is specific to a unique plant host in which it causes disease.Collectively, these F. oxysporum strains infect and kill a large host range including many commercially harvested crops such as species in the Solenaceae family (tomatoes, peppers, potatoes, eggplant), watermelon, lettuce, legumes, beets, basil, strawberries, chrysanthemum, sugarcane, bananas, and multiple other species. Fusarium oxysporum spores survive dormant in soil sometimes for 30 years, are easily spread in water, on machinery and seeds, and can hide in the rhizomes or vegetative cuttings of infected plants, showing no symptoms until transmitted to other individuals; all these are qualities that make this fungus an important and potentially devastating agricultural pest (Gonsalves and Ferreira 1993; Miller et al. 1996; New York Botanical Garden 2003; Wikipedia 2014a,b).

Of particular urgent threat currently is the Fusarium oxysporum f. sp. cubense; the special form specific to bananas, which causes Panama disease deadly to banana plants.Cavendash bananas, the strain which compose 85% of world banana exports, are generally F. oxysporum-resistant, however fall susceptible to a new variant of F. oxysporum f.sp. cubense, termed Tropical Race 4 (Foc TR4).FocTR4 was first identified in Asia in 1992, infecting the Philippines and Northern Australia shortly thereafter.In 2013 Jordan and Mozambique reported TR4 infected crops creating intense concern for its inevitable spread into banana producing countries in Africa and South America.Hygiene to reduce the spread of the fungus and transgenic techniques to introduce resistance genes into Cavendash bananas are tools researchers hope will save the industry (Butler 2013; IITA Press Release 2013; Plant Health Australia 2013; García-Bastidas et al. 2014; Wikipedia 2014c).

Fusarium oxysporum attacks its host by entering through the root.It grows in the plant xylem, eventually blocking the vascular system.This prevents transport of water and nutrients to the rest of the host, causing wilting, discoloration, and ultimately death of the plant (Gonsalves and Ferreira, 1993; Wikipedia 2014a).

In addition to having well-studied pathogenic activity in plants, the broad host range of Fusarium oxysporum extends outside plant kingdom, into Animalia.It is an emerging opportunistic human pathogen, reported as one of the most common agents causing invasive fungal infections in immunocompromised patients; as F. oxysporum is resistant to most available antifungal drugs, these infections are serious and frequently fatal in mammals.Scientists have proposed developing F. oxysporum as a universal model for understanding fungal virulence (Ortoneda et al. 2003).

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Fusarium oxysporum

provided by wikipedia EN

Fusarium oxysporum (Schlecht as emended by Snyder and Hansen),[1] an ascomycete fungus, comprises all the species, varieties and forms recognized by Wollenweber and Reinking[2] within an infrageneric grouping called section Elegans. It is part of the family Nectriaceae.

Although their predominant role in native soils may be as harmless or even beneficial plant endophytes or soil saprophytes, many strains within the F. oxysporum complex are soil borne pathogens of plants, especially in agricultural settings.

Taxonomy

While the species, as defined by Snyder and Hansen, has been widely accepted for more than 50 years,[3][4] more recent work indicates this taxon is actually a genetically heterogeneous polytypic morphospecies,[5][6] whose strains represent some of the most abundant and widespread microbes of the global soil microflora.[7]

Genome

The Fot1 family of transposable elements was first discovered by Daboussi et al., 1992 in several formae speciales[8][9] and Davière et al., 2001 and Langin et al., 2003 have since found them in most strains at copy numbers as high as 100.[8]

Habitat

These diverse and adaptable fungi have been found in soils ranging from the Sonoran Desert, to tropical and temperate forest, grasslands and soils of the tundra.[10] F. oxysporum strains are ubiquitous soil inhabitants that have the ability to exist as saprophytes, and degrade lignin[11][12] and complex carbohydrates[13][14][1] associated with soil debris. They are pervasive plant endophytes that can colonize plant roots[15][16] and may even protect plants or form the basis of disease suppression.[17][18]

Because the hosts of a given forma specialis usually are closely related, many have assumed that members of a forma specialis are also closely related and descended from a common ancestor.[19] However, results from research conducted on Fusarium oxysporum f. sp. cubense forced scientists to question these assumptions. Researchers used anonymous, single-copy restriction fragment length polymorphsims (RFLPs) to identify 10 clonal lineages from a collection of F. oxysporum f.sp. cubense from across the world. These results showed that pathogens of banana causing Panama disease could be as closely related to other host's pathogens, such as melon or tomato, as they are to each other. Exceptional amounts of genetic diversity within F. oxysporum f.sp. cubense were deduced from the high level of chromosomal polymorphisms found among strains, random amplified polymorphic DNA fingerprints and from the number and geographic distribution of vegetative compatibility groups.[20]

Pathogen

Presented with the wide-ranging occurrence of F. oxysporum strains that are nonpathogenic, it is reasonable to conclude that certain pathogenic forms were descended from originally nonpathogenic ancestors. Given the association of these fungi with plant roots, a form that is able to grow beyond the cortex and into the xylem could exploit this ability and hopefully gain an advantage over fungi that are restricted to the cortex.

The progression of a fungus into vascular tissue may elicit an immediate host response, successfully restricting the invader; or an otherwise ineffective or delayed response, reducing the vital water-conducting capacity and induce wilting.[21] On the other hand, the plant might be able to tolerate limited growth of the fungus within xylem vessels, preceded by an endophytic association.[22] In this case, any further changes in the host or parasite could disturb the relationship, in a way that fungal activities or a host response would result in the generation of disease symptoms.

Pathogenic strains of F. oxysporum have been studied for more than 100 years. The host range of these fungi is broad and includes animals, ranging from arthropods[23] to humans,[24] as well as plants, including a range of both gymnosperms and angiosperms. While collectively, plant pathogenic F. oxysporum strains have a broad host range, individual isolates usually cause disease only in a narrow range of plant species. This observation has led to the idea of "special form" or forma specialis in F. oxysporum. Formae speciales have been defined as "…an informal rank in Classification… used for parasitic fungi characterized from a physiological standpoint (e.g. by the ability to cause disease in particular hosts) but scarcely or not at all from a morphological standpoint." Exhaustive host range studies have been conducted for relatively few formae speciales of F. oxysporum.[25] For more information on Fusarium oxysporum as a plant pathogen, see Fusarium wilt and Koa wilt.

Different strains of F. oxysporum have been used for the purpose of producing nanomaterials (especially Silver nanoparticles).

"Agent Green" in Colombia

In 2000, the government of Colombia proposed dispersing strains of Crivellia and Fusarium oxysporum, also known as Agent Green, as a biological weapon to forcibly eradicate coca and other illegal crops.[26] The weaponized strains were developed by the US government, who originally conditioned their approval of Plan Colombia on the use of this weapon, but ultimately withdrew the condition.[27] In February 2001, the EU Parliament issued a declaration specifically against the use of these biological agents in warfare.[27]

Gold interactions

The fungus has the ability to dissolve gold, then precipitate it onto its surface, encrusting itself with gold. This phenomenon was first observed in Boddington, West Australia.[28] As a result of this discovery, F. oxysporum is currently being evaluated as a possible way to help detect hidden underground gold reserves.[29] It also is used to manufacture gold nanoparticles.[30]

Formae speciales

See also

References

  1. ^ a b Snyder WC, Hansen NH (1940). "The Species Concept in Fusarium". American Journal of Botany. 27 (2): 64–67. doi:10.1002/j.1537-2197.1940.tb14217.x. JSTOR 2436688.
  2. ^ Wollenweber HW, Reinking OA (1935). Die Fusarien, ihre Beschreibung, Schadwirkung und Bekampfung [The fusariums, their description, harmful effects and control] (in German). Berlin: P. Parey. OCLC 1123368362.
  3. ^ Booth C (1971). The genus Fusarium. Commonwealth Agricultural Bureaux [for the] Commonwealth Mycological Institute. ISBN 978-0-85198-046-1. OCLC 281402.
  4. ^ Nelson PE, Toussoun TA, Marasas WF (1983). Fusarium species: an illustrated manual for identification. The Pennsylvania State University Press. ISBN 978-0-271-00349-8. OCLC 802515637.
  5. ^ O'Donnell K, Cigelnik E (February 1997). "Two divergent intragenomic rDNA ITS2 types within a monophyletic lineage of the fungus Fusarium are nonorthologous". Molecular Phylogenetics and Evolution. 7 (1): 103–16. doi:10.1006/mpev.1996.0376. PMID 9007025.
  6. ^ Waalwijk C, de Koning JR, Baayen RP, Gams W (1996). "Discordant Groupings of Fusarium spp. from Sections Elegans, Liseola and Dlaminia Based on Ribosomal ITS1 and ITS2 Sequences". Mycologia. 88 (3): 361–368. doi:10.1080/00275514.1996.12026663. JSTOR 3760877.
  7. ^ Gordon TR, Martyn RD (1997). "The evolutionary biology of Fusarium oxysporum". Annual Review of Phytopathology. 35: 111–28. doi:10.1146/annurev.phyto.35.1.111. PMID 15012517. S2CID 33777569.
  8. ^ a b Daboussi, Marie-Josée; Capy, Pierre (2003). "Transposable Elements in Filamentous Fungi". Annual Review of Microbiology. Annual Reviews. 57 (1): 275–299. doi:10.1146/annurev.micro.57.030502.091029. ISSN 0066-4227. PMID 14527280. S2CID 21127350.
  9. ^ Daboussi, Marie-Josée; Langin, Thierry; Brygoo, Yves (1992). "Fot1, a new family of fungal transposable elements". Molecular & General Genetics. Springer. 232 (1): 12–16. doi:10.1007/bf00299131. ISSN 0026-8925. PMID 1313143. S2CID 22865806.
  10. ^ Stoner MF (1981). "Ecology of Fusarium in noncultivated soils". In Nelson PE, Toussoun TA, Cook RJ (eds.). Fusarium: diseases, biology, and taxonomy. Pennsylvania State University Press. pp. 276–286. ISBN 978-0-271-00293-4.
  11. ^ Rodriguez A, Perestelo F, Carnicero A, Regalado V, Perez R, De la Fuente G, Falcon MA (November 1996). "Degradation of natural lignins and lignocellulosic substrates by soil-inhabiting fungi imperfecti". FEMS Microbiology Ecology. 21 (3): 213–219. doi:10.1111/j.1574-6941.1996.tb00348.x.
  12. ^ Sutherland JB, Pometto III AL, Crawford DL (1 April 1983). "Lignocellulose degradation by Fusarium species". Canadian Journal of Botany. 61 (4): 1194–1198. doi:10.1139/b83-126.
  13. ^ Christakopoulos P, Kekos D, Macris BJ, Claeyssens M, Bhat MK (February 1995). "Purification and mode of action of a low molecular mass endo-1,4-β-d-glucanase from Fusarium oxysporum". Journal of Biotechnology. 39 (1): 85–93. doi:10.1016/0168-1656(94)00147-5.
  14. ^ Christakopoulos P, Nerinckx W, Kekos D, Macris B, Claeyssens M (November 1996). "Purification and characterization of two low molecular mass alkaline xylanases from Fusarium oxysporum F3". Journal of Biotechnology. 51 (2): 181–9. doi:10.1016/0168-1656(96)01619-7. PMID 8987884.
  15. ^ Gordon TR, Okamoto D, Jacobson DJ (1989). "Colonization of muskmelon and nonsusceptible crops by Fusarium oxysporum f. sp. melonis and other species of Fusarium". Phytopathology. 79 (10): 1095–1100. doi:10.1094/Phyto-79-1095.
  16. ^ Katan J (1971). "Symptomless carriers of the tomato Fusarium wilt pathogen". Phytopathology. 61 (10): 1213–1217. doi:10.1094/Phyto-61-1213.
  17. ^ Larkin RP, Hopkins DL, Martin FN (1993). "Effect of successive watermelon plantings on Fusarium oxysporum and other microorganisms in soils suppressive and conducive to fusarium wilt of watermelon". Phytopathology. 83 (10): 1097–1105. doi:10.1094/Phyto-83-1097.
  18. ^ Lemanceau P, Bakker PA, De Kogel WJ, Alabouvette C, Schippers B (January 1993). "Antagonistic Effect of Nonpathogenic Fusarium oxysporum Fo47 and Pseudobactin 358 upon Pathogenic Fusarium oxysporum f. sp. dianthi". Applied and Environmental Microbiology. 59 (1): 74–82. Bibcode:1993ApEnM..59...74L. doi:10.1128/AEM.59.1.74-82.1993. PMC 202057. PMID 16348860.
  19. ^ O'Donnell K, Kistler HC, Cigelnik E, Ploetz RC (March 1998). "Multiple evolutionary origins of the fungus causing Panama disease of banana: concordant evidence from nuclear and mitochondrial gene genealogies". Proceedings of the National Academy of Sciences of the United States of America. 95 (5): 2044–9. Bibcode:1998PNAS...95.2044O. doi:10.1073/pnas.95.5.2044. PMC 19243. PMID 9482835.
  20. ^ Fourie G, Steenkamp ET, Gordon TR, Viljoen A (July 2009). "Evolutionary relationships among the Fusarium oxysporum f. sp. cubense vegetative compatibility groups". Applied and Environmental Microbiology. 75 (14): 4770–81. Bibcode:2009ApEnM..75.4770F. doi:10.1128/AEM.00370-09. PMC 2708428. PMID 19482953.
  21. ^ Ploetz RC (June 2006). "Fusarium Wilt of Banana Is Caused by Several Pathogens Referred to as Fusarium oxysporum f. sp. cubense". Phytopathology. 96 (6): 653–6. doi:10.1094/PHYTO-96-0653. PMID 18943184.
  22. ^ Appel DJ, Gordon TR (1994). "Local and regional variation in populations of Fusarium oxysporum from agricultural field soils". Phytopathology. 84 (8): 786–791. doi:10.1094/Phyto-84-786.
  23. ^ Teetor-Barsch GH, Roberts DW (December 1983). "Entomogenous Fusarium species". Mycopathologia. 84 (1): 3–16. doi:10.1007/BF00436991. PMID 6369143. S2CID 21772636.
  24. ^ Nelson PE, Dignani MC, Anaissie EJ (October 1994). "Taxonomy, biology, and clinical aspects of Fusarium species". Clinical Microbiology Reviews. 7 (4): 479–504. doi:10.1128/cmr.7.4.479. PMC 358338. PMID 7834602.
  25. ^ Kistler HC (2001). "Evolution of host specificity in Fusarium oxysporum". In Nelson PE, Summerell BA (eds.). Fusarium: Paul E. Nelson Memorial Symposium. APS Press. pp. 70–82. ISBN 978-0-89054-268-2. OCLC 46786813.
  26. ^ "Grain — Sprouting Up: Battle Lines Drawn over Agent Green".
  27. ^ a b "EU Parliament Rejects Agent Green for Colombia" (Press release). The Sunshine Project. 1 February 2001.
  28. ^ CSIRO. "Gold-coated fungi". www.csiro.au. Retrieved 2022-06-10.
  29. ^ Bohu T, Anand R, Noble R, Lintern M, Kaksonen AH, Mei Y, et al. (May 2019). "Evidence for fungi and gold redox interaction under Earth surface conditions". Nature Communications. 10 (1): 2290. Bibcode:2019NatCo..10.2290B. doi:10.1038/s41467-019-10006-5. PMC 6533363. PMID 31123249.
  30. ^ Sayadi, Khali; Akbarzadeh, Fatemeh; Pourmardan, Vahid; Saravani-Aval, Mehdi; Sayadi, Jalis; Chauhan, Narendra Pal Singh; Sargazi, Ghasem (2021). "Methods of green synthesis of Au NCs with emphasis on their morphology: A mini-review". Heliyon. Cell Press. 7 (6): e07250. doi:10.1016/j.heliyon.2021.e07250. ISSN 2405-8440. PMC 8220187. PMID 34189304.
  31. ^ Lawson RH (July 2011). "Detection, Diagnosis and Control of Lily Diseases". Acta Horticulturae (900): 313–324. doi:10.17660/ActaHortic.2011.900.40.
  32. ^ Hanks GR (1996). "Control of Fusarium oxysporum f.sp. narcissi, the cause of narcissus basal rot, with thiabendazole and other fungicides". Crop Protection. 15 (6 September): 549–558. doi:10.1016/0261-2194(96)00023-3.
  33. ^ Hanks G, Carder J (2003). "Management of basal rot - the narcissus disease". Pesticide Outlook. 14 (6): 260. doi:10.1039/B314848N. S2CID 54515245.
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Fusarium oxysporum: Brief Summary

provided by wikipedia EN

Fusarium oxysporum (Schlecht as emended by Snyder and Hansen), an ascomycete fungus, comprises all the species, varieties and forms recognized by Wollenweber and Reinking within an infrageneric grouping called section Elegans. It is part of the family Nectriaceae.

Although their predominant role in native soils may be as harmless or even beneficial plant endophytes or soil saprophytes, many strains within the F. oxysporum complex are soil borne pathogens of plants, especially in agricultural settings.

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