Puccinia phragmitis
| Puccinia phragmitis | ||||||||||||
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Aecien of Puccinia phragmitis on knotweed plants |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia phragmitis | ||||||||||||
| ( Schumacher ) Körnicke |
Puccinia Phragmitis is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the knotweed family and the sweet grass - genus Phragmites . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It occurs worldwide.
features
Macroscopic features
Puccinia phragmitis 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 Phragmitis grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. The aecia of the species have 18–23 × 15–19 µm in size, approximately ellipsoidal to broadly ellipsoidal and hyaline aeciospores with a wrinkled surface. The cinnamon-brown uredia of the species grow on both sides of the leaves of the host plant. Their yellow to golden brown uredospores are ovate to ellipsoidal, 26–33 × 20–24 µm in size and finely spiky. The bilateral growing parts of the species are chocolate brown and uncovered early. The deep golden to light hazelnut brown teliospores of the fungus are two-celled, usually ellipsoidal and 40–60 × 19–24 µm in size. Their stem is colorless to brownish and up to 200 µm long.
distribution
The known distribution area of Puccinia phragmitis includes the whole world.
ecology
The host plants of Puccinia phragmitis for the Haplonts are various knotweed plants (Polygonaceae spp.) As well as Phragmites species for the Dikaryonts . 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 .
