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Basidiomycetes Characteristics: Septate mycelium

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Presentation on theme: "Basidiomycetes Characteristics: Septate mycelium"— Presentation transcript:

1 Basidiomycetes Characteristics: Septate mycelium
Basidia and basidiospores Clamp connections. Not all Basidiomycetes produce these, but when a fungus does it will always be a basidiomycete.

2 Basidiomycetes Characteristics:
Two main groups, based on morphology of basidia. Basidia are septate and deeply lobed Order Uredinales – the rusts Produce all five spore stages – aeciospores, uredospores, teliospores, basidiospores and spermatia (aka pycniospores) Important genera – Puccinia, Gymnosporangium Order Ustilaginales – the smuts Produce only basidiospores and teliospores Important genera – Ustilago, Tilletia

3 Order Uredinales Order Ustilaginales

4 Basidiomycetes Characteristics:
Two main groups, based on morphology of basidia. Basidia are unicellular, non-septate: wood decay fungi Order Aphyllophorales (aka Polyporales) – the bracket fungi Hymenium lines small pores on underside of sporophore Important genera – Polyporus, Fomes Order Agaricales – the mushrooms Hymenium lines gills (lamellae) Important genera – Armillaria, Agaricus

5 Aphyllophorales Agaricales

6 Basidiomycetes 5. Three types of hyphae
Primary hyphae – develops from a germinating basidiospore. Nuclear status = n Secondary hypha – results from fusion of two primary hyphae. Yields a n+n cell that continues to grow as a n+n hyphae Tertiary hypha – exactly the same as secondary hypha. n+n However it has thick walls that enable production of fleshy and wood sporophores Primary hyphae Primary hyphae Secondary hyphae Tertiary hyphae

7 The Rusts These are obligate parasites. Generally these require two host to complete their lifecycle. Primary hosts – the host on which basidia and basidiospores are produced. Alternate host – the other host in the life cycle on which spermagonia and aecia are produced Alternative host – the host that a pathogen can infect in place of the primary or alternate hosts. Heteroecious – organisms with a primary and alternate host. Autoecious – organisms that have only a single (primary) host. Macrocyclic rust – long cycle rust. Produce all 5 spore types. Demicyclic rust – medium cycle rust. Omits uredia. Microcyclic rust – short cycle rusts. Produces basidiospores, teliospores and spermatia.


9 Wheat stem rust, caused by Puccinia graminis tritici

10 Cedar apple rust, caused by Gymnosporangium juniperi-virginianum
lacks the uredia stage = no repeating stage

11 The Smuts Unique characteristics of smuts (vs. rusts)
They are not obligate parasites. We can grow them in culture. They show a very high degree of selectivity. They attack not only certain host but certain tissues of the host. Have only tow spore types: basidiospores and teliospores. Example: corn smut, caused by Ustilago maydis


13 Review Wheat stem rust – all spore types
Cedar apple rust – lacks ureida Coffee rust – no aecial stage Smuts – basidiospores + teliospores only

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