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Uredo is a genus of rust fungi: long considered incertae sedis in the order Pucciniales, but now placed in the family Pucciniaceae. [2] This long-established genus, together with the closely-related Uromyces (which some authorities consider to be synonymous), give their names to "uredo-type" fungal spore structures such as "urediniospore" and uredinium".
The leaf discoloration is due to fungal structures called sori, which are clusters of spore-bearing structures. During sporulation, sori burst through leaves releasing teliospores and cause leaves to appear tattered. [3] These spores are reddish brown, smoothly rounded, and they tend to be in clumps of 5-6 with sterile cells around them. [6]
Urediniospores of 11 Milesina species. a Milesina blechni on Struthiopteris spicant b Milesina blechni on Struthiopteris spicant, cracked spore with released plasma, germ pores scattered c Milesina carpatica on Dryopteris filix-mas d Milesina exigua on Polystichum braunii, smooth surface e Milesina exigua on Polystichum braunii, smooth surface, plasma-free spore, germ pores bipolar f Milesina ...
Puccinia graminis is a macrocyclic heteroecious fungus that causes wheat stem rust disease. [citation needed] The sexual stage in this fungus occurs on the alternate host – barberry – and not wheat. The durable spore type produced on the alternate host allows the disease to persist in wheat even in more inhospitable environments.
Uromyces betae is a fungal species and plant pathogen infecting beet (Beta vulgaris). It was originally published as Uredo betae Pers. 1801 before it was transferred to the Uromyces genus. [2] Sugar beet rust was first described in Canada in 1935,(Newton and Peturson 1943), [3] and then reported in Europe in 1988 (O'Sullivan). [4]
Zoospores are naked (wall-less), kidney-shaped and bi-flagellate. Both flagella are inserted laterally. Thick-walled sexual spores, called oospores are produced which germinate, producing either vesicles inside the plant tissue, exit tubes with vesicles at the tip, or germ tubes. Further zoospores develop inside the vesicles.
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Uromyces dianthi is a fungus species and plant pathogen infecting carnations and Euphorbia. It was originally published as Uredo dianthi by mycologist Christiaan Hendrik Persoon in 1801, before it was transferred to the Uromyces genus in 1872 by Gustav Niessl von Mayendorf .
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