Puccinia permixta
| Puccinia permixta | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia permixta | ||||||||||||
| Sydow & Sydow |
Puccinia permixta is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of leeks and the sweet grass genus Cleistogenes . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in the eastern Palearctic .
features
Macroscopic features
Puccinia permixta 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 permixta grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. The aecia of the fungus have 16–22 × 11–16 µm , hyaline aeciospores with a wrinkled surface. The light orange uredia of the species mostly grow on the underside of the leaves of the host plant. Their pale yellow to golden uredospores are usually broadly ovate to almost spherical, 19–22 × 16–19 µm in size and finely spiky. The parts of the species growing underneath the leaves are black-brown, powdery and uncovered early on. The hazelnut-brown teliospores of the fungus are two-celled, usually ellipsoidal to broadly ovate and 30–40 × 21–24 µm in size. Their stem is colorless to pale yellow and up to 90 µm long.
distribution
The known distribution area of Puccinia permixta includes eastern Russia , Afghanistan and China .
ecology
The host plants of Puccinia permixta are for the haplonten leek ( Allium spp.) And Cleistogenes serotina and C. squarrosa for the dikaryote . 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 with Telien, Uredien, Spermogonia and Aecien and changes host.
literature
- George Baker Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin 1971, ISBN 3-540-05336-0 .