Puccinia cacabata
| Puccinia cacabata | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia cacabata | ||||||||||||
| Arthur & Holway |
Puccinia Cacabata is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of cotton 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 occurs from southern North America to South America .
features
Macroscopic features
Puccinia cacabata 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 Cacabata grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. The aecia of the species have 24–30 × 19–23 µm large, spherical or ellipsoidal, hyaline aeciospores with a wrinkled surface. The cinnamon-brown uredia of the species grow on both sides of the leaves of the host plants. Their cinnamon - brown uredospores are broadly ellipsoidal to ovoid, 21–27 × 20–24 µm in size and finely spiky. The parts of the species growing on stems and leaves on both sides are black-brown and uncovered early. The hazel-brown teliospores of the fungus are two-celled, usually oblong to broadly ellipsoidal and 34–40 × 20–24 µm in size. Their stem is colorless and up to 90 µm long.
distribution
The well-known distribution area of Puccinia cacabata extends from the southwest USA over the Bahamas to Bolivia and Argentina .
ecology
The host plants of Puccinia Cacabata are for the haploid cotton ( Gossypium spp.) And Bouteloua - Cathesticum and various Chloris TYPES for 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 Telien, Uredien, Spermogonia and Aecien and changes host.
literature
- George B. Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin 1971, ISBN 3-540-05336-0 .