Uromyces setariae-italicae
| Uromyces setariae-italicae | ||||||||||||
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| Scientific name | ||||||||||||
| Uromyces setariae-italicae | ||||||||||||
| Yoshino |
Uromyces setariae-Italicae is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite from cordia and various sweet grasses . 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 setariae-italicae 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 setariae-Italicae grows as with all Uromyces TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. The aecia of the species have 20–27 × 18–23 µm large, spherical to ellipsoidal, hyaline aeciospores with a warty surface. The cinnamon-brown uredia of the fungus grow on both sides of the host leaves. Their cinnamon-brown uredospores are 27–33 × 23–28 µm in size, broadly ovate to ellipsoidal and spiky. The bilateral growing parts of the species are blackish, inconspicuous and covered. The light chestnut-brown teliospores are unicellular, mostly angular, spherical to ovoid and 18-25 × 16-20 µm in size. Their stem is colorless and up to 20 µm long.
distribution
The known distribution area of Uromyces setariae-italicae includes the warm regions of the whole world.
Ecology and importance
The host plants of Uromyces setariae-Italicae are for the haploid Kordien ( Cordia spp.), And grasses of the genera Brachiaria , Cyrtococcum , Eriochloa , Melinis , Ottochloa , Panicum , Paspalidium , Pennisetum , Setaria , Stenotaphrum and Urochloa for the dikaryotic . 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 spermogonia, Aecien, Telien and Uredien and completes a host change .
Its occurrence on millet is economically significant .
literature
- George Baker Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin 1971, ISBN 3-540-05336-0 .