5. Ascomycetes Flashcards

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1
Q

Ascomycetes belong to the phylum

A

Ascomycota

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2
Q

Ascomycetes produce sexual spores called

A

Produce sexual spores called ascospores within asci (sing. ascus) which are sac-like structures

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3
Q

Most species of Ascomycetes are mycelial but some are also

A

yeasts

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4
Q

Mycelial ascomycetes are normally septate with

A

septal pores and may have woronin bodies

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5
Q

Ascomycetes have a wide range of nutritional types like

A

Saphrophytes, pathogens and symbionts

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6
Q

Ascomycetes are the most common agent of

A

of mycosis in humans

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7
Q

examples of mycosis in humans

A

Onychomycosis (Trichophyton rubrum) (a fungal infection of the nail unit)

Tinea versicolor (lota) (Yeast -Malassezia globosa)

Aspergillosis (A. fumigatus) (an infection caused by Aspergillus, a common mold (a type of fungus) that lives indoors and outdoors. Most people breathe in Aspergillus spores every day without getting sick.)

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8
Q

what are the most important plant pathogens

A

Ascomycetes

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9
Q

examples of ascomycetes plant pathogens

A

Alternaria leaf spot (appears as fairly large brown spots on leaves, about 0.5 to 0.75 inches (12–18 mm) in diameter)

Sigatoka disease - Mycosphaerella (leaf spot or leaf streak disease caused by infection with Mycosphaerella fijiensis, which is endemic to most banana-exporting countries.)

Fusarium root rot (may result in stunted seedlings, rotting roots, stem discoloration, wilting and death)

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10
Q

Environmental importance of ascomycetes

A

Lichens - establishing new ecosystems, providing food for animals, preventing soil erosion, and for monitoring pollution

Aspergillosis in seafan coral – ( likely contribute to, normal healthy physiological processes in corals

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11
Q

Asexual reporduction of Ascomycetes include

A

Fission;
Budding;
Fragmentation (Arthrospores);
Soredia;
Conidia (most popular)

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12
Q

Explain Conidia asexual reproduction in Ascomycetes

A

In deuteromycetes (imperfect fungi) the conidiophores containing conidia may be fused together to form specialized structures such as synnemata and sporodochium);

Conidia may also be produced within pycninia (resemble perithecium) and acervuli (resemble apothecium);

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13
Q

deuteromycetes are

A

imperfect fungi

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14
Q

the 4 types of conidomata

A

Septoria

Marssonia

Epicoccum

Arthrobotryum

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15
Q

Septoria are

A

Pycnidium

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16
Q

Marssonia are

A

Acervulus

17
Q

Epicoccum are

A

Sporodochium

18
Q

Arthrobotryum are

A

Synnema