Uromyces trifolii repentis
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| Uromyces trifolii repentis | ||||||||||||
| Liro |
Uromyces trifolii-repentis is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of clover . 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 trifolii-repentis 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 trifolii-repentis grows as with all Uromyces TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Their spermogonia grow predominantly on the upper side of the host leaves. The aecia of the species that grow on both sides and on petioles are short and stand in groups. Their hyaline aeciospores are 18–22 × 15–18 µm in size, almost spherical to broadly ellipsoidal and warty. The uredia of the mushroom growing on both sides and on stems are light cinnamon brown. The golden-brown uredospores are 24–27 × 19–22 µm in size, spherical to broadly ellipsoidal and spiky. The predominantly underside of the leaf, growing on stems and petioles, are chestnut brown, powdery and uncovered. The light chestnut-brown teliospores are unicellular, usually spherical to broadly ellipsoidal, warty and mostly 22–26 × 18–22 µm in size. Their stem is colorless.
distribution
Uromyces trifolii-repentis occurs worldwide outside the tropics.
ecology
The host plants of Uromyces trifolii-repentis are various clover ( Trifolium 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 .
Systematics
Uromyces trifolii-repentis was first described by Castagne in 1880 as Aecidium trifolii-repentis and given its current name in 1906 by Johan Ivar Liro . Uromyces trifolii-repentis is divided into two varieties: Uromyces trifolii-repentis var. Trifolii-repentis occurs in Central Europe on white clover , Swedish clover and strawberry clover . Uromyces trifolii-repentis var. Fallens occurs on meadow clover and middle clover . The latter variety is sometimes also viewed as a separate species, namely Uromyces fallens .
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
- ↑ GBIF Portal, accessed on January 15, 2013 ( Memento of the original from March 4, 2016 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
- ^ Mycobank, accessed January 15, 2013
- ↑ Peter Zwetko Die Rostfilze Austria's supplement and host-parasite directory for the 2nd edition of the Catalogus Florae Austriae, III. Part, Book 1, Uredinales. Online (PDF; 1.8 MB)
- ↑ Plant diseases: recognize - understand - avoid
