Mucor structure and reproduction

1. Mucor
Presented by
E.Gayathiri
Assistant Professor
Guru Nanak College
Chennai

2. Learning objective
Systematic position
Occurrence
Somatic structure
Reproduction
Life cycle

3. SYSTEMATIC POSITION
Division : Eumycota
Sub Division : Zygomycotina
Class : Zygomycetes
Order : Mucorales
Family : Mucoraceae
Genus : Mucor

4. Occurrence

5. Body of mucor is composed of mass of
white, delicate, cottony threads collectively known
as mycelium
Much branched and coenocytic i.e. aseptate and
multinucleate.
Each thread of the mycelium is known as hypha .
The mycelium spreads in all directions over the
substratum.
Some of the hyphal branches penetrate down into
the substratum to absorb water and nutrients.
Somatic structure

6. Sub-terranean
hyphae
Prostrate
hyphae
Aerial
hypha
HYPHAE
Source: Biology Reader

7. REPRODUCTION VEGETATIVE
REPRODUCTION
ASEXUAL
REPRODUCTION
SEXUAL
REPRODUCTION
Sporangiospore
Oidia
Chlamydospore

8. Vegetative
Reproduction:
It takes place by fragmentation
Accidental breakage of hyphae
Mycelium may break up into two or more units.
Each unit is capable to grow as mother mycelium.
What is Mucor? Characteristics ...biologyreader.com

9. Asexual reproduction through
sporangiophores
From the hyphae, first sporangiophores arise singly
and are erect in position and unbranched.
maturation of sporangiophore occurs where the
cytoplasm and nuclei push upwards by making
the aerial hyphae swollen from the apical end.
After that, it develops a large round sporangium.

10. Sporangium differentiates into
maturation phase
ColumellaplasmSporoplasm

11. Mycelium
grows in a
substrate rich
in sugar
some small, thin-
walled cell
detaches out of the
vegetative cell
Then oidospores
remain dormant
for some time
On favourable
conditions it
germinate to form a
new vegetative
body.
Asexual
reproduction
of Mucor by
oidospores

12. During
unfavourable
condition, thick-
walled, nutrition
rich, mycelium
segments are
developed by
septation which are
termed as
chlamydospore
They get separated
from each other
when the
connecting
mycelium dries up.
In favourable
condition, the
chlamydospore
germinates and
gives rise to a new
mycelium.
Asexual reproduction of
Mucor by Chlamydospores

13. Sexual reproduction
Gametangial conjugation

14. Sexual reproduction
Gametangial conjugation

15. LIFE CYCLE MUCOR

16. THANK YOU