PLNTPTH 2000 Lecture Notes - Lecture 6: Rhizopus, Zygomycosis, Zygospore
22 Feb 2017
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Examples of Oomycota
Missed class.
Fungus -O- The Day
❖ [“yours”]
Kingdom Fungi
❖ Phyla:
➢ Chytridiomycota
■ Form motile spores called zoospores
■ Meiosis occurs in resting sporangium
➢ Zygomycota (TALKING ABOUT TODAY)
■ Form asexual spores called sporangiospores
● Asexual reproduction by these
sporangiospores--main character used for
identification
● Sexual reproduction by gametangial fusion
between morphologically identical gametangia
(Isogamy)
■ Meiosis occurs in zygospore
● Zygospores are therefore the result of sexual
reproduction
■ 173 genera, >1,000 species comprising ~1% of
described fungi
■ Non-motile spores
■ Extensive haploid coenocytic mycelium, septa only at
base of reproductive structures
■
➢ Ascomycota
■ Form asexual spores called conidia
■ Meiosis occurs in ascus
➢ Basidiomycota
■ Meiosis occurs in basidium
Rhizopus sp.
❖ This is a common saprophytic fungi on plants and specialized parasites on animals.
❖ This widespread genus includes at least eight species.
❖ They are found on a wide variety of organic substrates,
including "mature fruits and vegetables", jellies, syrups,
leather, bread, peanuts, and tobacco.
❖ Some Rhizopus species are opportunistic agents of human
zygomycosis (fungal infection) and can be fatal. Rhizopus
infections may also be a complication of diabetic
ketoacidosis.
❖ Rhizopus species grow as filamentous, branching hyphae
that generally lack cross-walls (i.e., they are
coenocytic).
❖ They reproduce by forming asexual and sexual
spores.
➢ In asexual reproduction, sporangiospores are produced inside a
spherical structure, the sporangium. Sporangia are supported by a large
apophysate columella atop a long stalk, the sporangiophore. Sporangiophores
arise among distinctive, root-like rhizoids.
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