Puccinia graminella
| Puccinia graminella | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia graminella | ||||||||||||
| Dietel & Holway |
Puccinia graminella is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sweet grass genera Nassella , Stipa and Piptochaetium . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in much of America.
features
Puccinia graminella 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.
The mycelium of Puccinia graminella grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. The whitish to yellowish aecia of the species grow on the upper side of the host leaves and are cylindrical or tongue-shaped. They have 22-25 × 20-23 µm large, mostly spherical aeciospores with a wrinkled surface. The parts of the species that grow on the top of the leaves are dark brown, powdery and up to 3 mm long. They grow in rows and often flow together in up to 5 mm long lines. The golden to chestnut brown teliospores are two-celled, broad to long ellipsoid and 37–56 × 24–30 µm in size. The stem is colorless to yellowish and up to 200 µm long.
distribution
The known distribution area of Puccinia graminella extends from western and southern South America to California .
ecology
The host plants of Puccinia graminella are for haplonts as for the dikaryotic are Nassella chilensis , Piptochaetium panicoides and various feather grass ( Stipa 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 has a development cycle with Telien, Aecien and Spermogonia and changes host.
literature
- George Baker Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin et al. 1971, ISBN 3-540-05336-0 .