5. Ascomycetes

Question 1

Ascomycetes belong to the phylum

Answer 1

Ascomycota

Question 2

Ascomycetes produce sexual spores called

Answer 2

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

Question 3

Most species of Ascomycetes are mycelial but some are also

Answer 3

yeasts

Question 4

Mycelial ascomycetes are normally septate with

Answer 4

septal pores and may have woronin bodies

Question 5

Ascomycetes have a wide range of nutritional types like

Answer 5

Saphrophytes, pathogens and symbionts

Question 6

Ascomycetes are the most common agent of

Answer 6

of mycosis in humans

Question 7

examples of mycosis in humans

Answer 7

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.)

Question 8

what are the most important plant pathogens

Answer 8

Ascomycetes

Question 9

examples of ascomycetes plant pathogens

Answer 9

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)

Question 10

Environmental importance of ascomycetes

Answer 10

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

Question 11

Asexual reporduction of Ascomycetes include

Answer 11

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

Question 12

Explain Conidia asexual reproduction in Ascomycetes

Answer 12

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);

Question 13

deuteromycetes are

Answer 13

imperfect fungi

Question 14

the 4 types of conidomata

Answer 14

Septoria

Marssonia

Epicoccum

Arthrobotryum

Question 15

Septoria are

Answer 15

Pycnidium

Question 16

Marssonia are

Answer 16

Acervulus

Question 17

Epicoccum are

Answer 17

Sporodochium

Question 18

Arthrobotryum are

Answer 18

Synnema