Puccinia orientalis
| Puccinia orientalis | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia orientalis | ||||||||||||
| Sydow & Sydow |
Puccinia orientalis is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of Brachiaria species, Cyrtococcum patens , Ottochloa nodosa and a Panicum species. Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It occurs in large parts of the Orientalis .
features
Macroscopic features
Puccinia orientalis 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 orientalis grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Aecia are not known of this species. The brownish uredia usually grow on the underside of the host's leaves. Their golden to cinnamon - brown uredospores are ellipsoidal to long-ellipsoidal, 33–44 × 15–19 µm in size and finely spiky. The parts of the species are black-brown, exposed early and grow underneath. The hazelnut brown teliospores are vertically septate, usually long club-shaped and 24–26 × 28–33 µm in size; its stem is hyaline and long.
distribution
The well-known distribution area of Puccinia orientalis extends from India over the Philippines to New Guinea .
ecology
The host plants of Puccinia orientalis are various Brachiaria species, Cyrtococcum patens , Ottochloa nodosa and an undetermined Panicum species. 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 apparently has a development cycle with Telien and Uredien, which manages without change of host; Spermogonia and aecia are apparently absent.
literature
- George B. Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin 1971, ISBN 3-540-05336-0 .