Puccinia guatemalensis
| Puccinia guatemalensis | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia guatemalensis | ||||||||||||
| Parmelee |
Puccinia guatemalensis is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sunflower genera Zexmenia and Wedelia . 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
Puccinia guatemalensis can only be recognized with the naked eye by means of the spore beds emerging 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 guatemalensis grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Your spermogonia grow on both sides of the surface of the host leaves. The aecia of the species that grow on both sides are light cinnamon brown and are in groups around the spermogonia. Their golden to yellowish aeciospores are 20–24 × 16–20 µm in size, ovate to ellipsoid and spiky. The uredia of the mushroom, which grow on both sides, are light cinnamon brown. The parts of the species that grow on both or mainly underside of the leaves are brown, compact and uncovered. The golden to clear maroon teliospores are two-celled, usually ovoid to broadly ellipsoidal and mostly 30–40 × 18–23 µm in size. Their stem is colorless.
distribution
The known distribution area of Puccinia guatemalensis extends from El Salvador to central Mexico .
ecology
The host plants of Puccinia guatemalensis are different Zexmenia and Wedelia species. 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 a self-sufficient 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 .