Aspergillus clavatus
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Aspergillus clavatus |
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Aspergillus clavatus is a mold from the genus of the watering can mold ( Aspergillus ). The cosmopolitan species is found mainly in the ground and on faeces. However, it can also attack grain and cause allergies in humans .
description
Aspergillus clavatus grows in flat or slightly fur-like colonies , the mycelium is rather thin for Aspergillus colonies, and the conidiophores grow between 1.5 and 3 millimeters high. They measure 20 to 30 micrometers. Large, blue-green, club-shaped heads appear on the stems. In some tribes the heads turn brown with age, in other tribes the colonies have a strong offensive odor.
The heads are 300 to 400 micrometers long and between 150 and 200 micrometers wide. With age, the heads divide into two, three or more compact lumps of chains of conidia and can then measure up to 1 millimeter in diameter. The sterigmata are in a single row and measure 2.5–3.5 × 2.0–3.0 μm at the base of the club and 7.0–8.0 μm at the top of the club (in extreme cases up to 10 μm) X 2.5-3.0 µm.
The conidia are elliptical and thick-walled. They measure 3.0-4.5 × 2.5-3.5 μm.
habitat
Aspergillus clavatus is cosmopolitan ; the main area of distribution is apparently in the tropics and subtropics. The species occurs mainly in the ground , on decaying parts of plants and in animal droppings. The droppings are preferred by domestic chickens ( Gallus gallus domesticus ) and pigeons (Columbidae). Apparently the species also attacks grain and other seeds and can thus be ingested by humans and animals.
meaning
This species can produce the poison patulin , which has been linked to diseases in humans and animals. In addition, cytochalasin E and tryptiquivalin are also produced. In addition, Aspergillus clavatus has been the main cause of malt workers' lungs (exogenous allergic alveolitis) since the 1930s . If heavily contaminated grain is fed, this can lead to serious livestock diseases and even death.
swell
literature
- Kenneth. B. Raper, Dorothy I. Fennel: The Genus Aspergillus . Williams & Wilkins, Baltimore 1965, pp. 137 ff .
Individual evidence
- ^ Brian Flanigan, Andrew R. Pearce: Aspergillus Spoilage: Spoilage of Cereals and Cereal Products by the Hazardous Species A. clavatus . In: Keith A. Owell, Annabel Renwick, John F. Pederby (Eds.): The Genus Aspergillus . Plenum Press, New York 1994, ISBN 0-306-44701-0 , pp. 115-128 .
- ↑ Maurice O. Moss: Biosynthesis of Aspergillus Toxins - Non Aflatoxins . In: Keith A. Owell, Annabel Renwick, John F. Pederby (Eds.): The Genus Aspergillus . Plenum Press, New York 1994, ISBN 0-306-44701-0 , pp. 29-50 .
Web links
- Aspergillus clavatus. In: Allergen Database. Allergopharma Joachim Ganzer KG, Reinbek, accessed on February 13, 2010 .