Uromyces graminis
| Uromyces graminis | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Uromyces graminis | ||||||||||||
| ( Niessl ) Dietel |
Uromyces graminis is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is a endoparasite of parsley family and from Melica - grasses . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in the southwestern Palearctic .
features
Macroscopic features
Uromyces graminis can only be recognized with the naked eye by means of the spore beds protruding on the surface of the host. They grow in nests that appear as yellowish to brown spots and pustules on the leaf surfaces.
Microscopic features
The mycelium of Uromyces graminis grows as with all Uromyces TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. The vesicular aecia of the species have 22–32 × 22–32 µm large, spherical and yellowish aeciospores with a warty surface. The cinnamon-brown uredia of the fungus grow on the top of the host leaves. Their golden uredospores are 24–29 × 21–24 µm in size, mostly broadly ellipsoidal and spiky. The parts of the species are black-brown, compact and uncovered early. The deep golden to clear chestnut brown teliospores are unicellular, usually ovoid to ellipsoid and 22–31 × 17–24 µm in size. Their stem is colorless to brownish and up to 50 µm long.
distribution
The known distribution area of Uromyces graminis includes southern Europe and North Africa.
ecology
The host plants of Uromyces graminis are for the Haplont umbelliferae (Umbelliferae spp.) And various Melica species for the dikaryote . The fungus feeds on the nutrients present in the storage tissue of the plants, its spore beds later break through the leaf surface and release spores. The species goes through a development cycle with spermogonia, Aecien, Telien and Uredien and completes a host change .
literature
- George Baker Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin 1971, ISBN 3-540-05336-0 .