Puccinia coronata
| Puccinia coronata | ||||||||||||
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Puccinia coronata on seed oats |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia coronata | ||||||||||||
| Corda |
Puccinia coronata is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of buckthorn , olive willow and berchemia as well as a variety of sweet grass species . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is spread all over the world.
features
Macroscopic features
Puccinia coronata 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 Puccinia coronata grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Their spermogonia are unknown. The whitish aecia of the species grow predominantly on the underside in groups on the surface of the host leaves. Their pale yellow aeciospores are 16–24 × 15–19 µm in size and warty. The uredia of the fungus, growing on both sides or predominantly on the underside, are yellow to yellow-brown, they have colorless paraphyses . The light yellowish to almost colorless uredospores of the species are 19–25 × 17–21 µm in size, ellipsoidal to broadly ellipsoidal and spiky. The bilateral growing parts of the species are blackish, long covered and provided with paraphyses. The golden to chestnut brown teliospores are two-celled, usually club-shaped and apically crowned, wrinkled and usually 36–65 × 14–19 µm in size. Their stem is yellowish to brownish and short. The appearance of these spores reminiscent of a crown is the reason for the name crown rust.
distribution
The known distribution area of Puccinia coronata includes the entire world.
ecology
The host plants of Puccinia coronata are for the haplont buckthorn , olive and berchemia species, for the dikaryote numerous different genera of sweet grasses . 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 macrocyclical development cycle with Spermogonia, Aecien, Telien and Uredien. As a heterosexual parasite, it changes host .
literature
- George Baker Cummins : The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin 1971, ISBN 3-540-05336-0 .
