Puccinia flaccida
| Puccinia flaccida | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia flaccida | ||||||||||||
| Berkeley & Broome |
Puccinia flaccida is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of oplisms - millet and Panicum chionachne . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It occurs in southern and eastern Asia .
features
Macroscopic features
Puccinia flaccida 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 flaccida 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 dark cinnamon-brown uredia of the species grow on both sides of the leaves of the host plants and are elliptical in shape. Their dark cinnamon to hazelnut brown uredospores are ellipsoidal to ovate, 23–30 × 23–27 µm in size and finely spiky. The branches growing on both sides are black-brown, uncovered early and powdery. The golden to cinnamon brown teliospores are two-celled, tend to be longitudinally septate, ellipsoidal to elongated and 25–44 × 15–23 µm in size; their stalk is colorless and up to 60 µm long.
distribution
The known distribution area of Puccinia flaccida includes Sri Lanka , India and Japan .
ecology
The host plants of Puccinia flaccida are the millet Panicum chionachne and various Oplismusus 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 .