Final Flashcards
<p>What are other names for the second class of ascomycetes?</p>
<p>Fungi Imperfecti
| Deuteromycetes</p>
<p>What are some reasons for the same species having different names?</p>
<p>Classified based on macroscopic features and reproductive features
Classified based on teleomorphic/anamorphic (sexual/asexual stages)</p>
<p>What are the types of fruiting bodies in ascomycetes?</p>
<p>Conidiophores (tree-like)
Acervulus (disk)
pycnidia (flasks)</p>
<p>Septoria create</p>
<p>pycnidium</p>
<p>Colletotrichum create</p>
<p>acervulus</p>
<p>Alternaria create</p>
<p>conidiophores</p>
<p>Botrytis creates</p>
<p>conidiophores</p>
<p>Verticillium creates</p>
<p>conidiophores and microsclerotia</p>
<p>Fusarium creates</p>
<p>conidiophores and clamydospore</p>
<p>What is the conidial life cycle?</p>
<p>Germination
Penetration
Sporulation</p>
<p>Pycnidia</p>
<p>flask-shaped
bear conidia
typically ooze conidia out during rain--slash dispersed
e.g. seportia leaf spots (necrotrophic)</p>
<p>Ascervulus</p>
<p>flat/disk shape embedded in plant tissue
frequently cause antracnose diseases (hemitrophic)
produce conidia</p>
<p>Conidiophores</p>
<p>tree-like
typical pathogen is facultative saprophyte
e.g. molds, vascular wilts, root/crown rots, leaf spots</p>
<p>Examples of alternaria</p>
<p>leaf spots early blight gray mold verticillium/vascular wilt (unilateral wilting)--e.g. Dutch Elm disease Fusarium rots storage molds</p>
<p>fusarium rots</p>
<p>opportunistic--can live endophytically, does well as saprophyte
e.g. dry potato rot, corn ear rot, wheat head blight
three types of asexual spores: macronidia, micronidia, clamydospores</p>
<p>Basidiomycota</p>
<p>club fungi</p>
<p>What are Basidiomycota cell walls made of?</p>
<p>Chitin</p>
<p>Sexual reproduction for Basidiomycota is carried out with what structure?</p>
<p>basidiophores</p>
<p>What kind of nuclei do Basidiomycota have?</p>
<p>dikaryotic (2 haploid nuclei)</p>
<p>What major pathogen groups are caused by Basidiomycota?</p>
<p>root rots and web blights (sterile fungi)
root and heart rots of forest and fruit trees
smuts of cereals
rusts of grasses, pines, rose family, coffee, etc.</p>
<p>What are some examples of root rots and web blights caused by Basidiomycota?</p>
<p>-Rhizoctonia: causes many diseases; mostly soil-borne; 90 degree hyphae branching; no asexual spores
-turf diseases: red thread (Laetisaria fuciform), gray snow mold (Typhula blight)</p>
<p>What are some examples of root and heart rots of forest and fruit trees caused by Basidiomycota?</p>
<p>-Armillaria root rot: facultative parasite; basidiocarp is a mushroom; transfers via root contact or rhizomorphs; attacks oak, grape, pine, fruit trees; colonizes dead wood
-heart rots: decay of older, central wood; caused by large fleshy fungi; basidia produced on basidiocarps (conks or mushrooms)</p>
<p>Rhizomorph</p>
<p>Aggregated mycelium strands
| Grow along roots and from root to root</p>
<p>How many basidiospores are produced in one conk?</p>
<p>~30 billion a day</p>
What are some examples of cereal smuts caused by Basidiomycota?
-loose smut of barley | -common corn smut (infect anywhere, not just seed; delicacy in Mexico)
What are some general characteristics of smuts?
obligate parasites 2 spore types: teliospores (overwinter), basidium (infective) fungal teliospores replace normal seeds of plant
What are some examples of rusts caused by Basidiomycota?
puccinia graminis: wheat stem rust; infects wheat and barberry
What are some general characteristics of rusts?
obligate parasites attack leaves and stems produce pustules usually don't kill, just weaken many produce 5 types of fruiting bodies
```What is the life cycle of rusts that produce 5 types of fruiting bodies?
teliospores --> meiosis --> basidium --> basidiospores --> spermagonium (infect new host) --> spermatia --> aecium (grows through host tissue) --> aeciospores (distributed through air to new host) --> uredium --> urediniospore (repeating stage) --> telium (overwinters) --> teliospore
Heteroecious
Pathogen requires more than two different plant hosts to complete life cycle
What are the six major groups of bacterial plant pathogens?
Pectobacterium (Erwinia): soft rots Pseudomonads: many, including ice + bacteria Xanthomonads: leaf spots, blights; often seed associated Agrobacterium: crown gall Clavibacter and Xyella: vascular wilts Candidatus Liberibacter: obligate phloem inhabitants