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MITOSPORIC FUNGI SPECIAL GROUPS

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Usually grouped together as the nematode-trapping fungi, but they may capture a ... Display a variety of morphological adaptations to either capture or attach ... – PowerPoint PPT presentation

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Title: MITOSPORIC FUNGI SPECIAL GROUPS


1
MITOSPORIC FUNGI SPECIAL GROUPS
  • IB371 - GENERAL MYCOLOGY
  • LECTURE 19
  • THURSDAY, OCTOBER 30, 2003

2
Predaceous Hyphomycetes
  • Usually grouped together as the nematode-trapping
    fungi, but they may capture a variety of
    invertebrates, especially protozoans.
  • Display a variety of morphological adaptations to
    either capture or attach to their prey.

3
Predaceous Hyphomycetes
  • Usually found in the soil, especially associated
    with organic debris that is also colonized by
    invertebrates.
  • Also found in dung, rotting wood, vegetable
    compost, leaf mold, etc.
  • Recently, a wood-rotting basidiomycete has been
    found to be predaceous.

4
METHODS OF ATTACK
  • Sticky hyphae
  • Sticky knobs
  • Non-constricting rings and nets
  • Constricting rings
  • Unusual conidia

5
STICKY KNOBS
6
STICKY KNOBS
7
STICKY KNOBS
8
ADHESIVE NETS
9
ADHESIVE NETS
10
NON-CONSTRICTING RINGS
11
NON-CONSTRICTING RINGS
12
NON-CONSTRICTING RINGS
13
CONSTRICTING RINGS
14
CONSTRICTING RINGS
15
CONSTRICTING RINGS
16
CONSTRICTING RINGS
17
CONSTRICTING RINGS
18
CONSTRICTING RINGS
19
UNUSUAL CONIDIA
20
UNUSUAL CONIDIA
21
UNUSUAL CONIDIA
22
UNUSUAL CONIDIA
23
AQUATIC HYPHOMYCETES
  • Found commonly in streams, creeks, rivers and a
    few species are found in lakes and ponds.
  • Occur mostly on deciduous leaves and woody debris
    of riparian tree and shrub species.

24
C. T. INGOLD
25
AQUATIC HYPHOMYCETES
  • Important decomposers of pectin, starches,
    cellulose hemicelluloses and lignins
  • Enrich the plant debris they colonize by
    increasing the protein content
  • May attract and serve as a food resource for
    invertebrates that are unable to digest
    lignocelluloses

26
AQUATIC HYPHOMYCETES
  • Polyphyletic group with representatives in the
    Basidiomycota and Ascomycota (Discomycetes,
    Pyrenomycetes, Loculoascomycetes)
  • Morphologically adapted for dispersal in water
    and attachment to substrates in flowing water

27
CONDIAL TYPES
28
CONDIAL TYPES
29
WHY WOULD NATURAL SELECTION FAVOR SIGMOIDAL OR
BRANCHED CONDIDIA IN FRESHWATER?
IN-CLASS ACTIVITY
30
Riffle area at Steps Bridge, Devon, England
31
ACCUMULATION OF FOAM
32
SPORES ADHERING TO AIR BUBBLE
33
FILIFORM CONIDIA
34
FILIFORM CONIDIA
35
(No Transcript)
36
TETRARADIATE CONIDIUM
37
TETRARADIATE CONIDIUM
38
TETRARADIATE CONIDIUM
39
TETRARADIATE CONIDIUM
40
(No Transcript)
41
SEM OF SUBMERGED DECOMPOSING LEAF
42
DECOMPOSING LEAVES
43
CONIDIA FILTERED FROM STREAM WATER
44
ENERGY FLOW IN STREAMS
45
(No Transcript)
46
AEROAQUATIC HYPHOS
  • Found in lentic and lotic habitats
  • Adapted for habitats with fluctuating water
    levels and for emergent substrates
  • Polyphyletic group (Basidiomycetous and
    Ascomycetous teleomorphs)
  • Decomposers of submerged substrates
  • Sporulate when substrates exposed to air

47
AEROAQUATIC HYPHOS
48
AEROAQUATIC HYPHOS
49
AEROAQUATIC HYPHOS
50
AEROAQUATIC HYPHOS
51
AEROAQUATIC HYPHOS
52
AEROAQUATIC HYPHOS
53
AEROAQUATIC HYPHOS
54
AEROAQUATIC HYPHOS
55
AEROAQUATIC HYPHOS
56
AEROAQUATIC HYPHOS
57
AEROAQUATIC HYPHOS
58
AEROAQUATIC HYPHOS
  • Morphologically adapted to trap air and/or float
  • Coiled conidia
  • Multicelled conidia with hollow centers
  • Hydrophobic conidia
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