Puccinia cymbopogonis
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Uredo- and teliospores of Puccinia cymbopogonis |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia cymbopogonis | ||||||||||||
| Massee |
Puccinia cymbopogonis is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sweet grass Cymbopogon citratus . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in sub- Saharan Africa.
features
Macroscopic features
Puccinia cymbopogonis 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 cymbopogonis 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 cinnamon to yellow-brown uredia of the fungus grow on the underside of the host leaves. Their golden to dark cinnamon-brown uredospores are 23–29 × 19–24 µm in size, spherical to oval and finely wrinkled. The parts of the species growing underneath the leaves are black-brown, powdery and exposed early. The light chestnut brown teliospores are two-celled, usually broadly ellipsoidal and 35–42 × 24–30 µm in size. Their stalk is yellowish to hyaline and up to 80 µm long.
distribution
The known distribution area of Puccinia cymbopogonis includes the central and southern Africa.
ecology
The host plant of Puccinia cymbopogonis is lemongrass . 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 .
