Uromyces senecionicola
| Uromyces senecionicola | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Uromyces senecionicola | ||||||||||||
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Uromyces senecionicola is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sunflower genus Senecio . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in Central America .
features
Macroscopic features
Uromyces senecionicola 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 senecionicola 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 surface of the host leaves. The aecia of the species growing opposite them are whitish and stand in groups. The uredia of the fungus, which predominantly grow underneath the leaves, are light yellow. The yellowish to hyaline uredospores are 28–35 × 20–23 µm in size, egg-shaped to ellipsoid and spiky. The parts of the species that grow underneath the leaves are gray-black and covered. The deep golden to clear chestnut brown teliospores are unicellular, usually ovoid to ellipsoid, smooth and mostly 28–40 × 18–23 µm in size. Their stem is golden and up to 50 µm long.
distribution
The known distribution area of Uromyces senecionicola extends from Mexico to Guatemala .
ecology
The host plants of Uromyces senecionicola are various ragweeds ( Senecio spp.). 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 .