Cordyceps

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Cordyceps
2010-08-06 Cordyceps militaris 1.jpg
Cordyceps militaris
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Fungi
Division: Ascomycota
Class: Sordariomycetes
Order: Hypocreales
Family: Cordycipitaceae
Genus: Cordyceps
Fr. (1818)
Type species
Cordyceps militaris
(L.) Fr. (1818)
Species [1]
List of species
  • Cordyceps acridophila
  • Cordyceps albocitrina
  • Cordyceps amoene -rosea
  • Cordyceps ampullacea
  • Cordyceps bifusispora
  • Cordyceps blackwelliae
  • Cordyceps brasiliensis
  • Cordyceps cateniannulata
  • Cordyceps cateniobliqua
  • Cordyceps chiangdaoensis
  • Cordyceps cicadae
  • Cordyceps coccidioperitheciata
  • Cordyceps coleopterorum
  • Cordyceps confragosa
  • Cordyceps cuncunae
  • Cordyceps cylindrica
  • Cordyceps farinosa
  • Cordyceps fratricida
  • Cordyceps fumosorosea
  • Cordyceps ghanensis
  • Cordyceps grylli
  • Cordyceps guangdongensis
  • Cordyceps gunnii
  • Cordyceps gunnii var. minor
  • Cordyceps henleyae
  • Cordyceps hepialidicola
  • Cordyceps hesleri
  • Cordyceps ignota
  • Cordyceps imagamiana
  • Cordyceps isarioides
  • Cordyceps javanica
  • Cordyceps kirkii
  • Cordyceps koreana
  • Cordyceps kurijimeansis
  • Cordyceps kyushuensis
  • Cordyceps lepidopterorum
  • Cordyceps locusticola
  • Cordyceps locustiphila
  • Cordyceps memorabilis
  • Cordyceps militaris
  • Cordyceps morakotii
  • Cordyceps nakazawai
  • Cordyceps nidus
  • Cordyceps ninchukispora
  • Cordyceps ningxiaensis
  • Cordyceps nirtolii
  • Cordyceps ochraceostromata
  • Cordyceps pleuricapitata
  • Cordyceps polyarthra
  • Cordyceps poprawskii
  • Cordyceps pruinosa
  • Cordyceps pseudonelumboides
  • Cordyceps rosea
  • Cordyceps roseostromata
  • Cordyceps scarabaeucika
  • Cordyceps sinensis See Ophiocordyceps sinensis .
  • Cordyceps spegazzinii
  • Cordyceps sphingum
  • Cordyceps submilitaris
  • Cordyceps taishanensis
  • Cordyceps takaomontana
  • Cordyceps tenuipes
  • Cordyceps unilateralis See Ophiocordyceps unilateralis .

Cordyceps /ˈkɔːrdɪsɛps/ is a genus of ascomycete fungi (sac fungi) that includes about 600 worldwide species. Diverse variants of cordyceps have had more than 1,500 years of use in Chinese medicine. [2] Most Cordyceps species are endoparasitoids, parasitic mainly on insects and other arthropods (they are thus entomopathogenic fungi); a few are parasitic on other fungi. [3]

The generic name Cordyceps is derived from the ancient Greek κορδύλη kordýlē, meaning "club", and the Latin -ceps, meaning "-headed". [4] The genus has a worldwide distribution, with most of the approximately 600 known species [5] being from Asia (notably Nepal, China, Japan, Bhutan, Korea, Vietnam, and Thailand).

Taxonomy

There are two recognized subgenera: [6]

Cordyceps sensu stricto are the teleomorphs of a number of anamorphic, entomopathogenic fungus "genera" such as Beauveria ( Cordyceps bassiana ), Septofusidium , and Lecanicillium . [9]

Splits

Cordyceps subgen. Epichloe was at one time a subgenus, but is now regarded as a separate genus, Epichloë . [6]

Cordyceps subgen. Ophiocordyceps was at one time a subgenus defined by morphology. Nuclear DNA sampling done in 2007 shows that members, including "C. sinensis" and "C. unilateralis", as well as some others not placed in the subgenus, were distantly related to most of the remainder of species then placed in Cordyceps (e.g. the type species C. militaris). As a result, it became its own genus, absorbing new members. [9] [10]

The 2007 study also peeled off Metacordyceps (anamorph Metarhizium , Pochonia ) and Elaphocordyceps . A number of species remain unclearly assigned and provisionally retained in Cordyceps sensu lato. [9]

Biology

When Cordyceps attacks a host, the mycelium invades and eventually replaces the host tissue, while the elongated fruit body (ascocarp) may be cylindrical, branched, or of complex shape. The ascocarp bears many small, flask-shaped perithecia containing asci. These, in turn, contain thread-like ascospores, which usually break into fragments and are presumably infective. [11]

With the example of Ophiocordyceps unilateralis, the life cycle after the death of the host involves three stages: dead host, stroma, and perithecia. In the dead host stage, the dead insect without any structure growing on its body is observed. In the stroma stage, an elongated stalk called stroma grows from the body of the host. In the perithecia stage, fruiting bodies develop on the stroma. After the perithecia stage, spores are released to the environment to infect other hosts. O. unilateralis go through several cycles in the sequence of dead host, stroma, and perithecia phases. [12]

Cordyceps manipulates host behavior to facilitate the transmission of spores. Examples include nest abandonment of hosts, [12] a phenomenon known as the “death grip,” in which the hosts hang under the leaves upside down and clamp themselves onto the leaves with their mandibles, [12] and self-exposure to predators for greater transmission to other hosts. [13]

Research

Cordycepin Cordycepin.svg
Cordycepin

Polysaccharide components and cordycepin are under basic research and have been isolated from C. militaris . [14] Research has found that cordycepin can ameliorate testicular damage caused by diabetes, by which it regulates the activities of antioxidant enzymes through the Sirt1/Foxo3a pathway. [15] Cordycepin has also been evidenced to abate the pathology associated with Alzheimer’s disease with the anti-oxidative stress and autophagy activation. [16] This implication opens up a potential treatment option for neurodegenerative diseases. From another species, Cordyceps gunnii, the extracted polysaccharides have been found to enhance the activities of natural killer cells and cytotoxic T cells in immunodeficient mice, as well as up-regulate the levels of cytokines and immunoglobulins. [17]

In addition, Cordyceps produces mycotoxins, such as alkaloids, peptides, and polyketides, that have been found to have fatal effects on both adults and nymphs of Asian citrus psyllids. [18] Moreover, Cordyceps-induced infection decreases activities of Asian citrus psyllids’ detoxification enzymes, such as superoxide dismutase (SOD), catalase (CAT), glutathione-S-transferase (GST), and peroxidase (POD). As these enzymes are important in regulating immune functions, the infection in turn suppresses immune activities of Asian citrus psyllids, causing them to succumb to environmental stresses more easily. [19] Discoveries on the effects of Cordyceps on Asian citrus psyllids provide potential solutions to citrus greening disease, or Huanglongbing.

Uses

Along with Ophiocordyceps , Cordyceps has long been used in traditional Chinese medicine in the belief it can be used to treat diseases. [20] There is no strong scientific evidence for such uses. [14] However, studies have found several effects of Cordyceps on health. For example, Cordyceps has been found to relieve respiratory, renal, cardiovascular, and hepatic problems, with its anti-oxidation, enhancing immunity, and anti-tumor activities. [21] In addition, Chinese herbal formula containing Cordyceps helps with increasing mitochondrial ATP production as well as mitochondrial antioxidant capacity. [22] Cordyceps also has nutritional value, as it contains biological components such as essential amino acids, various vitamins (B1, B2, B12, E and K), and minerals such as iron, calcium, magnesium, and zinc. [23] Moreover, Cordyceps has been found to improve symptoms of asthma. [24]

Cordyceps has appeared throughout popular culture:

See also

Related Research Articles

<i>Ophiocordyceps sinensis</i> Species of fungus

Ophiocordyceps sinensis, known colloquially as caterpillar fungus, is an entomopathogenic fungus in the family Ophiocordycipitaceae. It is mainly found in the meadows above 3,500 metres (11,500 ft) on the Tibetan Plateau in Tibet and the Himalayan regions of Bhutan, India, and Nepal. It parasitizes larvae of ghost moths and produces a fruiting body which is valued in traditional Chinese medicine as an aphrodisiac. Caterpillar fungus contains the compound cordycepin, an adenosine derivative. However, the fruiting bodies harvested in nature usually contain high amounts of arsenic and other heavy metals, so they are potentially toxic and sales have been strictly regulated by China's State Administration for Market Regulation since 2016.

<span class="mw-page-title-main">Cordycepin</span> Chemical compound

Cordycepin, or 3'-deoxyadenosine, is a derivative of the nucleoside adenosine, differing from the latter by the replacement of the hydroxy group in the 3' position with a hydrogen. It was initially extracted from the fungus Cordyceps militaris, but can now be produced synthetically. It is also found in other Cordyceps species as well as Ophiocordyceps sinensis.

<i>Ophiocordyceps unilateralis</i> Species of fungus

Ophiocordyceps unilateralis, commonly known as zombie-ant fungus, is an insect-pathogenic fungus, discovered by the British naturalist Alfred Russel Wallace in 1859, and currently found predominantly in tropical forest ecosystems. O. unilateralis infects ants of the tribe Camponotini, with the full pathogenesis being characterized by alteration of the behavioral patterns of the infected ant. Infected hosts leave their canopy nests and foraging trails for the forest floor, an area with a temperature and humidity suitable for fungal growth; they then use their mandibles to attach themselves to a major vein on the underside of a leaf, where the host remains after its eventual death. The process, leading up to mortality, takes 4–10 days, and includes a reproductive stage where fruiting bodies grow from the ant's head, rupturing to release the fungus's spores. O. unilateralis is, in turn, also susceptible to fungal infection itself, an occurrence that can limit its impact on ant populations, which has otherwise been known to devastate ant colonies.

<span class="mw-page-title-main">Ophiocordycipitaceae</span> Family of fungi

Ophiocordycipitaceae is a family of parasitic fungi in the Ascomycota, class Sordariomycetes. It was updated in 2020.

<i>Ophiocordyceps</i> Genus of fungi

Ophiocordyceps is a genus of fungi within the family Ophiocordycipitaceae. The widespread genus, first described scientifically by British mycologist Tom Petch in 1931, contains about 140 species that grow on insects. Anamorphic genera that correspond with Ophiocordyceps species are Hirsutella, Hymenostilbe, Isaria, Paraisaria, and Syngliocladium.

Podonectria is a genus in the monotypic Podonectriaceae family of fungi. They are parasitic fungus on scale insects, other fungi, or on substrates that had previously colonized by other fungi.

<i>Tolypocladium</i> Genus of fungi

Tolypocladium is a genus of fungi within the family Ophiocordycipitaceae. It includes species that are parasites of other fungi, insect pathogens, rotifer pathogens and soil inhabiting species with uncertain ecological roles.

Thitarodes caligophilus is a species of moth of the family Hepialidae. It is found in Bhutan. It is a host of the entomopathogenic fungus Ophiocordyceps sinensis, a species of the genus Cordyceps. The fruiting bodies of Ophiocordyceps sinensis are used extensively in Traditional Chinese medicine. As a result, T. caligophilus-sourced Cordyceps harvested in Bhutan have become "widely used".

Ophiocordyceps myrmecophila is a species of fungus that parasitizes insect hosts, in particular members of the order Hymenoptera.

<i>Cordyceps militaris</i> Species of fungus

Cordyceps militaris is a species of fungus in the family Cordycipitaceae, and the type species of the genus Cordyceps, which consists of hundreds of species. The species was originally described by Carl Linnaeus in 1753 as Clavaria militaris. Cordyceps militaris parasitizes insects and is used use in traditional Chinese medicine and modern pharmaceuticals.

<span class="mw-page-title-main">Cordycipitaceae</span> Family of fungi

The Cordycipitaceae are a family of parasitic fungi in the Ascomycota, class Sordariomycetes and order Hypocreales. The family was first published in 1969 by mycologist Hanns Kreisel, but the naming was invalid according to the code of International Code of Nomenclature for algae, fungi, and plants. It was validly published in 2007.

<i>Ophiocordyceps macroacicularis</i> Species of fungus

Ophiocordyceps macroacicularis is an entomopathogenic fungus belonging to the order Hypocreales (Ascomycota) in the family Ophiocordycipitaceae, which parasitize moth larvae. It produces superficial, oval perithecia at the apex of its stroma, and also multiseptate ascospores, while producing Hirsutella-type anamorphs on growth culture media. They are particularly distinguished by the size and shape of their stromata.

Ophiocordyceps arborescens is an entomopathogenic fungus belonging to the order Hypocreales (Ascomycota) in the family Ophiocordycipitaceae. It produces superficial, oval perithecia at the apex of its stroma, and also multiseptate ascospores, while producing Hirsutella-type anamorphs on growth culture media. They are particularly distinguished by the shape and size of their stroma.

Ophiocordyceps coenomyia is an entomopathogenic fungus belonging to the order Hypocreales (Ascomycota) in the family Ophiocordycipitaceae. It is parasitic to awl-fly larvae. This species is characterized by a globose, alutaceous fertile part at the apex of its light yellow stroma, its immersed perithecia, and ascospores dividing in turn into partspores. The species is closely related to O. heteropoda.

<i>Ophiocordyceps formicarum</i> Species of fungus

Ophiocordyceps formicarum is an entomopathogenic fungus belonging to the order Hypocreales (Ascomycota) in the family Ophiocordycipitaceae. The fungus was first described by mycologist George S. Kobayashi in 1939 as a species of Cordyceps. Originally found in Japan growing on an adult Hercules ant, it was reported from Guizhou, China, in 2003. It was transferred to the new genus Ophiocordyceps in 2007 when the family Cordycipitaceae was reorganized. A technique has been developed to grow the fungus in an agar growth medium supplemented with yeast extract, inosine, and glucose.

<i>Ophiocordyceps robertsii</i> Species of fungus

Ophiocordyceps robertsii, known in New Zealand as vegetable caterpillar is an entomopathogenic fungus belonging to the order Hypocreales (Ascomycota) in the family Ophiocordycipitaceae. It invades the caterpillars of leaf-litter dwelling moths and turns them into fungal mummies, sending up a fruiting spike above the forest floor to shed its spores. Caterpillars eat the spores whilst feeding on leaf litter to complete the fungal life cycle. Evidence of this fungus can be seen when small brown stems push through the forest floor: underneath will be the dried remains of the host caterpillar. This species was first thought by Europeans to be a worm or caterpillar that burrowed from the top of a tree to the roots, where it exited and then grew a shoot of the plant out of its head. It was the first fungus provided with a binomial name from New Zealand.

<i>Cordyceps locustiphila</i> Species of fungus

Cordyceps locustiphila is the basionym and teleomorph of the fungi Beauveria locustiphila, a species of fungus in the family Cordycipitaceae. and is a species within the genus Cordyceps. It was originally described in by Henn in 1904. C. locustiphila is an entomopathogen and obligate parasite of the grasshopper species within the genus Colpolopha or Tropidacris, and as such is endemic to South America. The scientific name is derived from its close relationship with its host, being named after locusts. The fungi was renamed to Beauveria locustiphila in 2017 following research into the family Cordycipitaceae. Following the loss of the species type specimen, new studies were conducted that now recommend that the fungi be divided into 3 species. C. locustiphila, C. diapheromeriphila, and C. acridophila.

<i>Cordyceps gunnii</i> Species of fungus

Cordyceps gunni is a species of fungus in the family Cordycipitaceae, and is of the genus Cordyceps. It was originally found and recorded by Gunn in Tasmania and named as Sphaeria gunnii and later moved into the Cordyceps genus and renamed Cordyceps gunnii. This fungus and its sisters in the genus Cordyceps are known for growing out of insect bodies. C. gunnii can be found at ground level poking out of caterpillar burrows, attached to a caterpillar's head.

<i>Isaria cicadae</i> Species of fungi

Isaria cicadae is an ascomycete fungus that parasitizes cicada larvae. It forms white and yellow asexual fruiting structures resembling synnema. While mostly being found throughout Asia in warm, humid regions, it has been found on various other continents. It is known in Traditional Chinese Medicine as Chan Hua and commonly called “cicada flower.” Its medicinal uses date back to the fifth century AD in China. It can also be used in various foods and tonics.

<i>Ophiocordyceps dipterigena</i> Species of fungus

Ophiocordyceps dipterigena is an entomopathogenic fungi species from the genus Ophiocordyceps. This species was originally described in 2007.

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