Uromyces vignae
| Uromyces vignae | ||||||||||||
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Uromyces vignae on asparagus bean |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Uromyces vignae | ||||||||||||
| Barclay |
Uromyces vignae is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the legume genus Vigna . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is spread all over the world.
features
Macroscopic features
Uromyces vignae 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 vignae grows as with all Uromyces TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Their spermogonia grow on the upper side in small groups on the host leaves. The aecia of the species, mostly growing on the underside of the leaves and on petioles, are whitish and fissured. Their aeciospores are 20–26 × 16–20 µm in size, ellipsoidal to long-ellipsoidal and warty. The uredia of the mushroom growing on both sides and on the stems are cinnamon brown. The light golden uredospores are 25–30 × 20–23 µm in size, ovate to broadly ellipsoidal and spiky. The parts of the species growing on both sides and on petioles are black-brown, powdery and uncovered. The teliospores are unicellular, usually ovoid to ellipsoid, smooth and mostly 30–38 × 19–24 µm in size. Their stem is colorless and up to 40 µm long.
distribution
The known distribution area of Uromyces vignae coincides with the distribution of the host genus and includes the whole world, especially warm regions.
ecology
The host plants of Uromyces vignae are different species of Vigna . 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 goes through a macrocyclical development cycle with Spermogonia, Aecien, Telien and Uredien. As an auto-ecologic parasite, it does not change host .
literature
- George Baker Cummins : Rust Fungi on Legumes and Composites in North America . University of Arizona Press, Tucson 1978, ISBN 0-8165-0653-1 .
