Uromyces niteroyensis
| Uromyces niteroyensis | ||||||||||||
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| Uromyces niteroyensis | ||||||||||||
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Uromyces niteroyensis is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is a endoparasite of Panicum - and Setaria - 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 South and Central America .
features
Macroscopic features
Uromyces niteroyensis 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 niteroyensis grows as with all Uromyces TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Aecia or spermogonia of the species are not known. The yellow to cinnamon-brown uredia of the fungus grow on both sides or predominantly on the underside of the host leaves and have yellowish paraphyses. Their cinnamon-brown uredospores are 29–38 × 20–27 µm in size, ovate to broadly ellipsoidal and finely spiky. The parts of the species are black-brown and late exposed. The golden to chestnut brown teliospores are single-celled, angularly ovate and 22–27 × 14–20 µm in size. Their stem is colorless and up to 25 µm long.
distribution
The known distribution area of Uromyces niteroyensis extends from Cuba and Mexico to Argentina and Brazil .
ecology
The host plants of Uromyces niteroyensis are Panicum antidotum and various Setaria 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 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 .