Pyrenophora graminea

Pyrenophora graminea
Pyrenophora graminea
Scientific classification
Kingdom: Fungi
Phylum: Ascomycota
Class: Ascomycetes
Order: Pleosporales
Family: Pleosporaceae
Genus: Pyrenophora
Species: P. graminea
Binomial name
Pyrenophora graminea
S. Ito & Kurib. 1931

Brachysporium gracile var. gramineum (Rabenh.) Sacc.
Drechslera graminea (Rabenh. ex Schltdl.)
Drechslera teres subsp. graminea (Rabenh. ex Schltdl.)
Helminthosporium gramineum Rabenh. ex Schltdl
Napicladium hordei Rostr.
Pleospora graminea Died.
Pyrenophora teres subsp. graminea (S. Ito & Kurib.)
Pyrenophora graminea S. Ito & Kurib.

Pyrenophora graminea is the causal agent of barley stripe. Barley stripe is disease of barley that once caused significant crop yield losses in many areas of the world.[1]



Asexual stage: Pycnidia are rarely observed in nature. They are 70-176 μm in diameter, globose to pear-shaped, and develop superficially or partly submerged. The wall is thin and fragile and is yellow to brown, with a short ostiole. Pycnidiospores are 1.4-3.2 x 1.0-1.6 μm, spherical or ellipsoidal, hyaline, and nonseptate.[1]

Sexual stage: Perithecia are rare in nature, they occur in barley straw in the autumn. The perithecia are 576-728 x 442-572 μm. They are supeficial to partly submerged and are elongate, with rigid setae on the surface. Acsi are club-shaped or cylindrical, clearly bitunicate, and rounded at the apex, with a short stalk at the base. Ascospores are 43-61 x 16-28 μm, light yellow-brown, ellipsoidal, and rounded at both ends, with transverse septa and one, occasionally two, septum in the median cells but never in the terminal cells.

Conidia are borne laterally and terminally on conidiophores, which usually occur in clusters of three to five. The conidia are straight with rounded ends and measure 11-24 x 30-100 μm. They are subhyaline to yellow-brown and have up to seven transverse septa.

In culture, mycelium is gray to olivaceous and is often sterile. Conidia may be formed when infected barley pieces as placed on water agar and incubated under diurnal light conditions followed by a period of chilling.


External links

Research articles


  1. ^ a b Mathre, D.E. (1997). Compendium of barley diseases. American Phytopathological Society. pp. 120 pp. 

Wikimedia Foundation. 2010.

Игры ⚽ Поможем написать реферат

Look at other dictionaries:

  • Pyrenophora — Taxobox | name = Pyrenophora regnum = Fungi divisio = Ascomycota classis = Ascomycetes ordo = Pleosporales familia = Pleosporaceae genus = Pyrenophora subdivision ranks = Species subdivision = Pyrenophora avenae Pyrenophora chaetomioides… …   Wikipedia

  • Barley stripe (barley) — Barley stripe is disease of barley that once caused significant yield losses in many areas of the world.cite book last = Mathre first = D.E. title = Compendium of barley diseases publisher = American Phytopathological Society date = 1997 pages =… …   Wikipedia

  • List of barley diseases — This article is a list of diseases of barley (Hordeum vulgare). Contents 1 Bacterial diseases 2 Nematodes, parasitic 3 Virus, viroid and virus like diseases 4 …   Wikipedia

  • Вредные организмы, не входящие в перечни особо опасных и опасных вредных организмов — Вредные организмы (в защите растений) в Российской Федерации подразделяются на карантинные, особо опасные и опасные вредные организмы. Помимо вредителей растений (позвоночных и беспозвоночных), возбудителей болезней растений и сорных растений,… …   Википедия

  • Род Гельминтоспорий (Helminthosporium) —         У грибов рода гельминтоспорнй характерна форма конидий (рис. 237, 238). Они темноцветные, прямые или слегка изогнутые, цилиндрические, веретеновидные или обратнобулавовидные, с несколькими поперечными перегородками. Конидии образуются у… …   Биологическая энциклопедия

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”