Puccinia hordei
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Puccinia hordei |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia hordei | ||||||||||||
| GH Otth |
Puccinia hordei (dwarf rust) is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of milk stars , two-leaved leaves and barley . Symptoms of infestation by the species are yellow spots of rust and pustules on the leaf surfaces of the host plants. The range covers the entire temperate zones of the world.
features
Macroscopic features
Puccinia hordei can only be recognized with the naked eye by 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 hordei grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Your pyknia are first honey-colored, later almost black and grow on both leaf sides. Your spermatia are hyaline and 3–4 × 1.5–2 µm in size. The aecia are spherical and only open like holes. They have round to ellipsoidal aecidiospores of 18–30 × 18–30 µm, which are hyaline and finely warty. The uredia grow on the upper side of the leaf and are orange to rust-colored. Their uredospores are usually spherical to ellipsoidal, 20–30 × 17–22 µm in size and slightly spiky. The parts of the species are small, point-like and black. The teleutospores are one to two-celled, variably shaped and 24–73 × 40–60 µm in size. They are brown, their stem is short.
distribution
Puccinia hordei has a distribution area that extends over the entire temperate zones of the northern and southern hemisphere.
ecology
The host plants of Puccinia hordei are as Haplont milk stars ( Ornithogalum spp.) And tail leaf ( Ornithogalum serotinum ) as well as barley ( Hordeum spp.) For the dikaryote . 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 pycnias, uredia, telia and aecidia.
literature
- Ernst Gäumann: The rust fungi of Central Europe. With special consideration of Switzerland . In: Contributions to the cryptogam flora in Switzerland . tape XII . Commission publisher Buchdruckerei Büchler & Co, Bern 1959.
