Pythium

フハイカビ属、フィチウム属、Pythium属

WordNet

1. destructive root-parasitic fungi
2. any fungus of the genus Pythium

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/12/25 13:59:23」(JST)

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For the ancient city named Pythium, see Pythion.

Pythium
Pythium
Scientific classification
Kingdom:	Chromalveolata
Phylum:	Heterokontophyta
Class:	Oomycota
Order:	Pythiales
Family:	Pythiaceae
Genus:	Pythium Pringsheim, 1858
Species
See text

Pythium is a genus of parasitic oomycotes. Most species are plant parasites, but Pythium insidiosum is an important pathogen of animals. They were formerly classified as fungi; the feet of the fungus gnat are frequently a vector for their transmission.

Morphology

Hyphae

Pythium, like others in the family Pythiaceae, are usually characterized by their production of coenocytic hyphae, hyphae without septations.

Oogonia

Generally contain a single oospore

Antheridia

Contain an elongated and club-shaped antheridium

Ecological importance

Pythium

Pythium-induced root rot is a common crop disease. When the organism kills newly emerged or emerging seedlings it is known as damping off, and is a very common problem in fields and greenhouses. This disease complex usually involves other pathogens such as Phytophthora and Rhizoctonia. Pythium wilt is caused by zoospore infection of older plants leading to biotrophic infections that become necrotrophic in response to colonization/reinfection pressures or environmental stress, leading to minor or severe wilting caused by impeded root functioning.

Many Pythium species, along with their close relatives Phytophthora, are plant pathogens of economic importance in agriculture. Pythium spp. tend to be very generalistic and unspecific in their host range. They infect a large range of hosts, while Phytophthora spp. are generally more host-specific.

For this reason, Pythium spp. are more devastating in the root rot they cause in crops, because crop rotation alone will often not eradicate the pathogen (nor will fallowing the field, as Pythium spp. are also good saprotrophs, and will survive for a long time on decaying plant matter).

It has been noted that in field crops, damage by Pythium spp. is often limited to the area affected, as the motile zoospores require ample surface water to travel long distances. Additionally, the capillaries formed by soil particles act as a natural filter and effectively trap many zoospores. However, in hydroponic systems inside greenhouses, where extensive monocultures of plants are maintained in plant nutrient solution (containing nitrogen, potassium, phosphate, and micronutrients) that is continuously recirculated to the crop, Pythium spp. cause extensive and devastating root rot and is often difficult to prevent or control. The root rot affects entire operations (tens of thousands of plants, in many instances) within two to four days due to the inherent nature of hydroponic systems where roots are nakedly exposed to the water medium, in which the zoospores can move freely.

Several Pythium species, including P. oligandrum, P. nunn, P. periplocum, and P. acanthicum are mycoparasites of plant pathogenic fungi and oomycetes, and have received interest as potential biocontrol agents.

Species

• Pythium acanthicum
• Pythium acanthophoron
• Pythium acrogynum
• Pythium adhaerens
• Pythium amasculinum
• Pythium anandrum
• Pythium angustatum
• Pythium aphanidermatum
• Pythium apleroticum
• Pythium aquatile
• Pythium aristosporum
• Pythium arrhenomanes
• Pythium attrantheridium
• Pythium bifurcatum
• Pythium boreale
• Pythium buismaniae
• Pythium butleri

• Pythium camurandrum
• Pythium campanulatum
• Pythium canariense
• Pythium capillosum
• Pythium carbonicum
• Pythium carolinianum
• Pythium catenulatum
• Pythium chamaehyphon
• Pythium chondricola
• Pythium citrinum
• Pythium coloratum
• Pythium conidiophorum
• Pythium contiguanum
• Pythium cryptoirregulare
• Pythium cucurbitacearum
• Pythium cylindrosporum
• Pythium cystogenes
• Pythium debaryanum
• Pythium deliense
• Pythium destruens
• Pythium diclinum
• Pythium dimorphum
• Pythium dissimile
• Pythium dissotocum
• Pythium echinulatum
• Pythium emineosum
• Pythium erinaceum
• Pythium flevoense
• Pythium folliculosum
• Pythium glomeratum
• Pythium graminicola
• Pythium grandisporangium
• Pythium guiyangense
• Pythium helicandrum
• Pythium helicoides
• Pythium heterothallicum
• Pythium hydnosporum
• Pythium hypogynum
• Pythium indigoferae
• Pythium inflatum
• Pythium insidiosum
• Pythium intermedium
• Pythium irregulare
• Pythium iwayamae
• Pythium jasmonium
• Pythium kunmingense
• Pythium litorale
• Pythium longandrum
• Pythium longisporangium
• Pythium lutarium
• Pythium macrosporum
• Pythium mamillatum
• Pythium marinum
• Pythium marsipium
• Pythium mastophorum
• Pythium megacarpum
• Pythium megalacanthum
• Pythium middletonii
• Pythium minus
• Pythium monospermum
• Pythium montanum
• Pythium multisporum
• Pythium myriotylum
• Pythium nagaii
• Pythium nodosum
• Pythium nunn
• Pythium oedochilum
• Pythium okanoganense
• Pythium oligandrum
• Pythium oopapillum
• Pythium ornacarpum
• Pythium orthogonon
• Pythium ostracodes
• Pythium pachycaule
• Pythium pachycaule
• Pythium paddicum
• Pythium paroecandrum
• Pythium parvum
• Pythium pectinolyticum
• Pythium periilum
• Pythium periplocum
• Pythium perniciosum
• Pythium perplexum
• Pythium phragmitis
• Pythium pleroticum
• Pythium plurisporium
• Pythium polymastum
• Pythium porphyrae
• Pythium prolatum
• Pythium proliferatum
• Pythium pulchrum
• Pythium pyrilobum
• Pythium quercum
• Pythium radiosum
• Pythium ramificatum
• Pythium regulare
• Pythium rhizo-oryzae
• Pythium rhizosaccharum
• Pythium rostratifingens
• Pythium rostratum
• Pythium salpingophorum
• Pythium scleroteichum
• Pythium segnitium
• Pythium spiculum
• Pythium spinosum
• Pythium splendens
• Pythium sterilum
• Pythium stipitatum
• Pythium sulcatum
• Pythium sylvaticum
• Pythium terrestris
• [Pythium torulosum
• Pythium tracheiphilum
• Pythium ultimum
  • Pythium ultimum var. ultimum
• Pythium uncinulatum
• Pythium undulatum
• Pythium vanterpoolii
• Pythium vexans
• Pythium viniferum
• Pythium violae
• Pythium volutum
• Pythium zingiberis]
• [Pythium zingiberum

References

See also

• Pythium in turfgrass

Further reading

• A. J. van der Plaats-Niterink (1981). "Monograph of the genus Pythium". Studies in Mycology 21: 1–242. 
• C. André Lévesque & Arthur W. M. de Cock (2004). "Molecular phylogeny and taxonomy of the genus Pythium". Mycological Research 108 (12): 1363–1383. doi:10.1017/S0953756204001431. 

English Journal

• Implications of oligomeric forms of POD-1 and POD-2 proteins isolated from cell walls of the biocontrol agent Pythium oligandrum in relation to their ability to induce defense reactions in tomato.

• Takenaka S, Yamaguchi K, Masunaka A, Hase S, Inoue T, Takahashi H.SourceMemuro Research Station, National Agricultural Research Center for Hokkaido Region, National Agriculture and Food Research Organization (NARO), Hokkaido 082-0081, Japan.
• Journal of plant physiology.J Plant Physiol.2011 Nov 1;168(16):1972-9. Epub 2011 Jun 15.
• The cell wall protein fraction (CWP) isolated from the biocontrol agent Pythium oligandrum induces defense reactions in tomato. CWP contains two novel elicitin-like proteins, POD-1 and POD-2, both with seven cysteines. To determine the essential structure in the defense-eliciting components of CWP,
• PMID 21680053

• DNA barcoding of oomycetes with cytochrome c oxidase subunit I and internal transcribed spacer.

• Robideau GP, De Cock AW, Coffey MD, Voglmayr H, Brouwer H, Bala K, Chitty DW, Desaulniers N, Eggertson QA, Gachon CM, Hu CH, Kupper FC, Rintoul TL, Sarhan E, Verstappen EC, Zhang Y, Bonants PJ, Ristaino JB, Andre Levesque C.SourceBiology Department, Carleton University, 1125 Colonel By Dr., Ottawa, Ontario, Canada K1S 5B6 Agriculture and Agri-Food Canada, 960 Carling Ave., Ottawa, Ontario, Canada K1A 0C6 CBS KNAW Fungal Biodiversity Centre, Uppsalalaan 8, 3584 CT Utrecht, The Netherlands Department of Plant Pathology and Microbiology, University of California, Riverside, CA 92521, USA Systematic and Evolutionary Botany, Faculty Center Biodiversity, University of Vienna, Rennweg 14, 1030 Wien, Austria Culture Collection for Algae and Protozoa, Scottish Association for Marine Science, Scottish Marine Institute, Oban PA37 1QA, UK Department of Plant Pathology, North Carolina State University, Raleigh, NC 27695, USA Plant Research International, Droevendaalsesteeg 1, 6708 PB Wageningen, The Netherlands.
• Molecular ecology resources.Mol Ecol Resour.2011 Nov;11(6):1002-1011. doi: 10.1111/j.1755-0998.2011.03041.x. Epub 2011 Jun 20.
• Oomycete species occupy many different environments and many ecological niches. The genera Phytophthora and Pythium for example, contain many plant pathogens which cause enormous damage to a wide range of plant species. Proper identification to the species level is a critical first step in any inves
• PMID 21689384

Japanese Journal

• 湿害軽減による多収を目指した麦・大豆の栽培技術と耐湿性育種のイノベーション--麦・大豆栽培における湿害の現実と研究展開

• 川口 健太郎
• 作物研究所研究報告 (12), 69-85, 2011-08
• NAID 40018981653

• キャベツピシウム腐敗病菌Pythium ultimum var. ultimumによる結球期の茎腐敗症状

• 池田 健太郎,三木 静恵,柴田 聡 [他]
• 植物防疫 65(7), 409-413,図巻頭1p, 2011-07
• NAID 40018896128

Related Links

• Pythium - Wikipedia, the free encyclopedia

Pythium is a genus of parasitic oomycete. Most species are plant parasites, but Pythium insidiosum is an important pathogen of animals. Because this group of organisms were once classified as fungi, they are sometimes still treated as such. ...

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