Puccinia setariae
| Puccinia setariae | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia setariae | ||||||||||||
| Dietel & Holway |
Puccinia setariae is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sweet grass Setaria geniculata . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in much of America.
features
Macroscopic features
Puccinia setariae can only be recognized with the naked eye by means of the spore beds emerging 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 setariae grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Aecia or spermogonia of the species are not known. The cinnamon-brown uredia of the fungus grow on the underside of the host leaves. Their golden uredospores are 29–34 × 25–28 µm in size, mostly ovate to broadly ellipsoidal and densely warty. The bilateral growing parts of the species are black-brown, powdery and exposed early. The chestnut-brown teliospores are two-celled, usually ellipsoidal and 37–45 × 26–30 µm in size. Their stalk is yellowish and up to 100 µm long.
distribution
The known distribution area of Puccinia setariae extends from Chile and Argentina to the southern USA .
ecology
The host plant of Puccinia setariae is Setaria geniculata . 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 has a development cycle of which only Telien and Uredien and their host are known; Spermogonia and aecia could not be assigned to the fungus.
literature
- George Baker Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin 1971, ISBN 3-540-05336-0 .