micromycetes - vscht.cz
TRANSCRIPT
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Micromycetes
Molds
Microscopic fungi
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Micromycetes - microscopic fungi - molds microfungi
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Alternative system
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FUNGI
-Kingdom of Eukaryota
-Eukaryotic organisms without plastids
-Nutrition absorptive (osmotrophic)
-Cell walls containing chitin and β-glucans
-mitochondria with flattened cristae
-Unicelullar or filamentous
-Mostly non flagellate
-Reproducing sexually or asexually
-The diploid phase generally short-lived
-Saprobic, mutualialistic or parasitic
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International Mycological Institute: DICTIONARY OF THE FUNGI (Kirk, Cannon, Minter, Stalpers) - 2008 ( 1943, 1945, 1950, 1954, 1961, 1971, 1983, 1995, 2001, 2008)
http://www.indexfungorum.org/Names/Names.asp
http://www.mycobank.org/
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Size of micromycetes
• 1.5 milions species, only 5% of them were formally classified
• Great diversity of life cycles and morphology
• Recent taxonomy is based on DNA analysis
• Majority of micromycetes is growing as fibre (hypha), that are cylindrical, fibrous structures 2–10 µm in diameter and long up to several centimeters.
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Newest phylogenetic tree
Kingdom Fungi
Division: Chytridiomycota
Microsporidiomycota
Zygomycota
Glomeromycota
Ascomycota
Basidiomycota
Simplified scheme:
Kingdom Fungi
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Fungi and pseudofungi
Kingdom: PROTOZOA Kingdom: CHROMISTA Phytophthora infestans
Myxomycota
Plasmodiophora brassicae
Spongospora subterranea
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Fungi and pseudofungi
Kingdom: PROTOZOA Division Acrasiomycota Myxomycota Plasmodiophoromycota Kingdom: CHROMISTA Division Labyrinthulomycota Peronosporomycota Hyphochytriomycota Kingdom: FUNGI Division Chytridiomycota Microsporidiomycota Glomeromycota Zygomycota Ascomycota Basidiomycota
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Fungal ecology
saprobic
mutualistic symbioses parasitic
Mycorrhizal fungi
lichens
+ endophyte
dermatophyte Cordyceps lloydii Mycosphaerella fragariae Spinellus fusiger
Penicillium sp.
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Kingdom: Fungi (Ophisthokonta)
• Division:
• Chytridiomycota
• Microsporidiomycota
• Glomeromycota
• Zygomycota
• Ascomycota
• Basidiomycota
Neocallimastigales
Synchytrium endobioticum
Batrachochytrium dendrobatidis
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Kingdom: Fungi (Ophisthokonta)
• Division:
• Chytridiomycota
• Microsporidiomycota
• Glomeromycota
• Zygomycota
• Ascomycota
• Basidiomycota
Nosema apis
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Kingdom: Fungi (Ophisthokonta)
• Division:
• Chytridiomycota
• Microsporidiomycota
• Glomeromycota
• Zygomycota
• Ascomycota
• Basidiomycota
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Kingdom: Fungi (Ophisthokonta)
• Division:
• Chytridiomycota
• Microsporidiomycota
• Zygomycota
• Glomeromycota
• Ascomycota
• Basidiomycota
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Kingdom: Fungi (Ophisthokonta)
• Division:
• Chytridiomycota
• Microsporidiomycota
• Zygomycota
• Ascomycota
• Basidiomycota
Rhodotorula sp.
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Structure of hyphae tip
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Growth tip of hypha
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Mikromycety - buňka
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Cell wall – chemical composition
• Polysaccharides - chitin(N-acetylglucosamin) - chitosan (deacetylated chitin) - β-glucans, mannans - next polysaccharides formed from 6-deoxyhexose
(e.g. rhamnose -6-deoxy-L-mannosa, etc.) - cellulose - compounds resembling lignin (support the wall rigidity) • Proteins • Fats • Waxes (respond for minimal moistening)
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Cytoplasmatic membrane
• Responsible for transport of nutrients and osmoregulation
• Location of some components of cell wall synthesis
• Oxidative phosphorylation does not take place in membrane
• Invaginations are not so common as in yeasts
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Nucleus
• Double membrane with huge pores
• Position in the centre of the cell
• Cells of some hyphae are coenocytic (multinuclear – a)
• Spores contain only one nucleus
• Number of chromosomes in haploid nucleus – 7 to 40
a
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Basic cytoplasma
• Composition and function does not differ from yeast cytoplasmy
• Main storage compound are lipids
• Lipids are stored in vacuols, in cytoplasma
• In older cells the lipids may release from vacuols, may be considered for spores
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Main organels
• Nucleus
• Mitochodria(mtDNA)
• Endoplasmatic reticulum
• Golgi apparat
• vacuols
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Mycelium
• Spore
• Hypha
• Progressive branching
• Mycelium – tangle of hyphae
• Scleromycelium – hard globular structure made from dens tangle of hyphae
• Stroma – leatherlike tangle of hyphae
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Mycelium substrate and aerial
Aerial mycelium
Substrate mycelium
agar
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Two types of hyphae
• Zygomycota and Chytridiomycota – vegetative mycelium is not septated
• Ascomycota and Basidiomycota – vegetative mycelium is septated, may be perfored (ascomycetes). Dikaryotic basidiomycetes are formed přesky.
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Reproduction of micromycetes
• Vegetative
• Sexual
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Reproduction of micromycetes - vegetative
• Outgrowth of hyphae
• Vegetative spores are formed ona
- vegetative hyphae
- fructification organs
-- exospores
-- endospores
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Vegetative spores on - vegetative hyphae
a – oidie (arthrospores)
are formed by
desintegration of
hyphae
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Shape and placement of exospores
• a – individual spores on septated mycelium (Sporotrichum)
• b – false bulb from chain of spores (Cephalosporium)
• c – halfmoon macroconidia (Fusarium)
• d – chain of septated macroconidia (Alternaria)
• e – spiral macroconidia (Helicoma)
• f – star shape macroconidia
Microconidia and macroconidia
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Reproduction of micromycetes – vegetative – endospores in sporangium
a –without columela (Mortierella)
b – with columela (Mucor)
c – columela with apophyse (Rhizopus)
d – tubular sporangia (Piptocephalis)
e – sporangioles (Thamnidium)
1 - sporangium 2 - sporangiofor
3 - kolumela 4 - apofýza
5 – bazální buňka
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Life cycle
anamorph teleomorph
HOLOMORPH
anamorph
Ascus
ascoma
teleomorph
conidia
conidia ascus
ascoma
ascospore
conidiophore
Pleomorphic life cycle
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Life cycle
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Life cycle of zygomycetes (Rhizopus)
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Division ASCOMYCOTA
• Subdivision: Taphrinomycotina (syn. ARCHIASCOMYCOTINA)
Class: Schizosaccharomycetes Class: Taphrinomycetes • Subdivision Saccharomycotina Class: Saccharomycetes • Subdivision Pezizomycotina (syn. ASCOMYCOTINA)
Class: Laboulbeniomycetes Class: Eurotiomycetes Class: Pezizomycetes Class: Leotiomycetes Class: Lecanoromycetes Class: Sordariomycetes Class: Dothideomycetes
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Life cycle of ascomycetes (Eupenicillium)
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Life cycle of ascomycetes
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Mycotoxines
• Mycotoxines are toxic secondary metabolites of many specia of microscopic filamentous fungi (molds), that can contamine a broad spectrum of food and feed. Producers of these dangerous natural contaminants cause various toxic syndromes called mycotoxicoses .
• Action of mycotoxines depends on type of toxin, duration of its effect, dose and age, its nutrition and actual state of health.
• Target organes of mycotoxines are on the first place the cells of liver, kidney, lungs,and nerves, endocrinous glands and cells of immune system. They can cause an acute toxic reaction and some can have mutagenic , terratogenic , carcinogenic and estrogenic effekt.
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Surveillance of mycotoxines • Numerous international authorities are trying to reach
worlwide standardization of regulatory limits for mycotoxines. Recently, more than 100 countries set up regulatory limits for mycotoxines in feed industry.
• Today 13 mycotoxines or groups of mycotoxines are recorded. Evaluation process necessary for regulation of mycotoxines include a great complexes of laboratory tests, that use extraction, purification and separatory techniques.
• Majority of oficial control methods is based on high pressure
liquid chromatography (HPLC).
• Many standards for mycotoxines analysis is guaranteed by European Committee for Standardization(CEN).
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Aflatoxin B1 Aflatoxin B2
Aflatoxin G1 Aflatoxin G2
STRUCTURE of AFLATOXINES
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Fusarious mycotoxines • Fusaria belongs to noticeable originators of mycoses
at human and produce mycotoxines threatening the health. Among the most dangerous mycotoxines are trichotecens, zearalenon, fumonizin.
• Zearalenon (C18H22O5) is white, or pale yellow crysta- lic compound without odour. Temperature of thawing about 161 - 164 °C. Insoluble in water, tetrachlormethane (CCl4) and alcoholes .
• Zearalenon is relatively lipophilic compound. Its content is reduced during technology of processing of cereals.
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Zearalenon
• Isolated in 1966
• White or pale yellow crystalic compound
• Temperature of thawing 161 – 164 °C
• Common in flour and cereal productes.
• Estrogenous effect
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Fumonisines
• Six structures: FB1, FB2, FB3, FB4, FA1 a FA2
• Derived from unsaturated fatty acids
• Disorders of sfingolipid metabolismus
• Liver and kidney tumors at rodents
Fumonisin B2
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Trichothecenes • 80 species (T-2 toxin, deoxynivalenol-DON…)
• Chemically variable
• Tricyclic seskviterpenes
• Signes of intoxication: inflammation of
gastrointestinal tract, nausea, diarrhea, inhibite
proteosynthesis, impaired immune system
deoxynivalenol T-2 toxin
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Ergot alkaloids • An ergot kernel, called a sclerotium, develops when a spore of
fungal species of the genus Claviceps infects a floret of flowering grass or cereal. The infection process mimics a pollen grain growing into an ovary during fertilization .
• Ergot alkaloidy are produced as mixture of toxick alkaloids in sklerotium of some Claviceps species, that are common pathogens of grass.
After consumption of ergot sklerotium from infected cereals, usually as a bread baked from contaminated flour, ergotismus také place, human disease historicaly known as the Saint Antony´s Fire.
Two forms of ergotism : 1) gangrenose affecting the blood circulation in limbs 2) spasmic, affecting central nerve system. Modern methods of cereal cleaning reduced significantly y
ergotism as human disesease, but it is still veterinary problem.
Ergot alkaloids have pharmaceutical application.
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Claviceps purpurea
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Ergot alkaloids
• Ergot alkaloids are classified as:
• derivatives of 6,8-dimethylergoline and
• lysergic acid derivatives
• The neurotropic activities of the ergot alkaloids may also cause hallucinations and attendant irrational behaviour, convulsions, and even death
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Aspergillus
-frequently causes contamination of food and feed
-manufacture of organic acids
-mycotoxine (Aflatoxins)
-osmophilic, osmotolerant
-allergens
-opportunistic pathogen
-warmer parts of the world
Foto: A. kubátová
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Aspergillus niger
Black aspergilli (Aspergillus section Nigri)
Important (toxic) metabolites: naphto-γ-pyrones, malformins, ochratoxin A (few isolates)
Colonies consisting of a compact white or yellow basal felt with a dense layer of dark brown to black conidiophores
Conidial heads black, radiate. Conidiophore stipes smooth-walled
Conidia globose to subglobose
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Penicillium
• Over 300 species
• One of the most widespread fungus
• Frequently causes contamination of food and feed
• mycotoxine
• allergens
• Pathogen – only one species P. marnefei
• Food processing (P. camemberti, P. roqueforti, P. nalgiovense)
• Antibiotic (Penicilin)
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Penicillium expansum
Important (toxic)metabolites: roquefortine C, patulin
Colonies on MEA after one week
Apple infected with Penicillium
Conidiophores and conidia
Odour aromatic-fruity Exudate absent
Phialides cylindrical with a short but distinct neck
Conidia subglobose
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Penicillium digitatum
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Fusarium (tel. Giberella, Nectria)
The most important mycotoxin 1.Aflatoxiny B a G 2.Aflatoxin M1 3.Patulin 4.Ochratoxin A 5.Deoxynivalenol (DON) 6.Zearalenon 7.Fumonisiny 8.T-2 toxin
macroconidia
macroconidia Foot-ceel
Microconidia
Polyblastic conidiogenous cell (polyphialide)
Microconidia in chain
monophialide
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Cladosporium
Cladosporium herbarum DBM 4073
Cladosporium sphaerospermum DBM 4282
ramoconidia ramoconidia
Cladosporium sphaerospermum
Cladosporium cladosporioides DBM 4145
Reverse greenish-black
A very common species, occurring on plant material and in soil.