Puccinia tanaceti
| Puccinia tanaceti | ||||||||||||
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Puccinia tanaceti on tarragon |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia tanaceti | ||||||||||||
| DC |
Puccinia tanaceti is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of chrysanthemums . 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
Puccinia tanaceti 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 tanaceti grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Their spermogonia and aecia are so far unknown. The cinnamon-brown uredia of the mushroom grow in a circle on the underside of the host leaves. Their cinnamon-brown uredospores are 28–32 × 22–26 µm in size, broadly ellipsoidal to ovate and spiky. The leaves of the species growing in circles on the underside of the leaves are black-brown, compact and uncovered. The clear maroon teliospores are two-celled, usually ellipsoidal and mostly 40–56 × 22–28 µm in size. Their stem is colorless and up to 110 µm long.
distribution
The known distribution area of Puccinia tanaceti covers the whole world.
ecology
The host plants of Puccinia tanaceti are various, mainly cultivated chrysanthemums ( Chrysanthemum spp.). However, it was found that the fungus has a relatively broad host range and can attack all species from the Anthemideae tribe , such as the wildflowers , Artemisia , yarrow , chrysanthemum and camomiles . 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 .
Individual evidence
- ^ Newcombe, G., 2003: Puccinia tanaceti: specialist or generalist? Mycol. Res. 107: 797-802. On-line
