deuteromycota

DeuteromycotDeuteromycotaa

The Imperfect FungiThe Imperfect Fungi

• Deuteromycota means “second fungi.”• Deuteromycota was a formal phylum of

kingdom Fungi. But, scientists have not yet observed Deuteromycota’s sexual reproductive cycle, one of the basis of the taxonomy of kingdom Fungi. Now, the term is only used informally to denote the species of fungi that reproduce asexually of the fungal phyla Ascomycota and Basidiomycota.


• They are characterized by the production of septate mycelium and a sexual life cycle that is either unknown or absent.

• They reproduce asexually by means of conidia (sing. = conidium). A conidium is an asexual spore that is not produced in a sporangium


DeuteromycotaDeuteromycota• There are four orders in phylum

Deuteromycota:•Moniliales•Sphaeropsidales•Melanconiales•Mycelia Sterlia


MonilialesDeuteromycota• In order Moniliales, conidia and

conidiophores are produced in mycelium

MonilialesMoniliales

Conidiophores of Ulocladium

Conidia of Alternaria tenuis are borne in chains

SphaeropsidalesDeuteromycota• Here, the conidia and

conidiophores produced in pycnidia (sing. = picnidium)

• A pycnidia is a fruiting body of variable shape and size in which conidia and conidiosphore are borne

SphaeropsidalSphaeropsidaleses

Pycnidium of Chaetomella. Unlike most pycnidium, this one is bowl-shaped with many setae: dark, thick-walled hairs.

MelanconialesDeuteromycota• Fungi from order Melanconiales

have acervuli (sing.=acervulus), a plate-like stroma on which conidia and conidiophores are borne.

MelanconialesMelanconiales

Acervulus of Pestalotia sp.

http://www.botany.hawaii.edu/faculty/wong/Bot201/Deuteromycota/Pestalotia1.jpg

Mycelia SterliaDeuteromycota• Mycelium is sterile, conidia not

produced.• They have sclerotia (sing.=

sclerotium). A sclerotium is a rounded structure composed of mass of hyphae, which is normally sterile. The sclerotia serves as a "resistant" stage which may give rise to mycelium, fruitbodies or stromata.

Mycelia Mycelia SterliaSterlia

Parasexual cycleDeuteromycota• “Parang sexual”• A process in which plasmogamy,

karyogamy, and haploidization takes place, but not in a particular place in the thallus nor at any specific period during its life cycle.

• It was first discovered by Pontecarvo and Roper(1952) in Aspergillus nidulans.

Parasexual Parasexual CycleCycle

Parasexual cycleDeuteromycota1. Formation of heterokaryotic

mycelium

Heterokaryon formation refers to the condition by which genetically different nuclei are associated in a common cytoplasm.


Parasexual cycleDeuteromycota2. Occasional karyogamy

Following initial fusion of hyphal cells, to form a genetically different cell, mitotic division perpetuates the cell and mycelium that is made up of genetically, different nuclei is formed.


Parasexual cycleDeuteromycota3.Haploidization

This haploidization is NOT meiosis. It is in fact, a series of errors in mitosis. A sequential loss of chromosomes will eventually give rise to a haploid nucleus.


Trichophyton Trichophyton interdigidaleinterdigidale

• a.k.a. Athlete's Foot• They live on the bottom of people's feet thrives

because of the warm moist skin caused by wearing socks and shoes all the time in our current society

This type of fungi grows faster because of lack of ventilation to the feet.


It causes Athlete's Foot along with many other organisms including Epidermophyton floccosum, Microsporum, and the human disease (ugly toenail fungus)

Can be extremely resistant to many treatments depending on the form of the Athlete's foot


How It Adapts

It can easily infect a human foot It is possible that everyone will, at some point, get Athlete's

foot It is learning to resist many treatments and is slowly

becoming immune to known treatments.


Economic/ Ecological Significance

It is painful and irritating There is a need to find new and more effective treatment

against Athlete's Foot Affect footwear design Affect foot care industry

Penicillium Penicillium roquefortiiroquefortii• Penicillium roquefortii is used in

the manufacture of blue cheeses e.g. Roquefort, Gorgonzola, Stilton, Danish Blue etc.

• During the fermentation process, fungus spores are injected into the curd. Growth of the fungus gives a pleasant tang to the final product. The blue in the blue-cheese is caused by the blue pigment in the spores (conidia) of the fungus. So, when you eat blue cheese you are consuming millions of spores. Yumm…

Penicillium Penicillium roquefortiiroquefortii• Penicillium roquefortii is a

common fungus that can be isolated from many sources--mostly organic or humus sources. This fungus is a saprobic organism belonging to the fungi imperfecti classification.

Penicillium Penicillium roquefortiiroquefortiiEconomic/Ecological Significance

Industrial uses: flavorings, proteases, antibacterial agents, polysaccharides, and, most well known, blue cheeses.

In general, P. roquefortii is safe to use as flavorings and for cheese. This fungi does, however, produce many mycotoxins. These mycotoxins are strong, but not stable. The FDA says that blue cheese is safe for human consumption, and does not really pose a threat to humans, unless the person has an allergy to the mycotoxins.

Monilinia Monilinia fructigenafructigena

Monilinia establishes infections in apple orchards, typically through wounds caused by insects or man.

Fruit that has fallen and is left on the ground is the source of infection for the next season. It shrinks and mummifies over winter but can produce spores the following season.

Left: infected with Monilinia fructigena

Right: perfectly healthy apple


Characteristics

The fungi causes the apple and fruits to rot when it invades the apple tissues and kills them by releasing enzymes.

The principal enzymes involved in this are pectic enzymes - those that break down the gel-like pectic compounds that cement the apple cells (or other plant cells) together.

There are several forms of these enzymes, but the major one is polygalacturonase (PG), which splits the long pectin chains into smaller units of galacturonic acid.


Maturing plant tissues generate ethylene, and ethylene is a ripening agent. [In fact, bananas are shipped while green, to preserve them in good condition, and then are treated with ethylene to induce ripening before they are sold.]

A single rotten fruit can lead to a chain reaction.

The damage caused by fruit-rotting fungi in even a single fruit in a package leads to the generation of ethylene and thus to the premature ripening of the other fruit.

Discovery in the control of this fungi could help reduce cost in the export or import of apple and other fruits

Many Thanks Many Thanks to…to…• http://www.botany.hawaii.edu/faculty/wong/Bot201/

Deuteromycota/Deuteromycota.htm • http://science.jrank.org/pages/2895/Fungi-

Deuteromycota-imperfect-fungi.html • http://www.thefreedictionary.com/• dit.dru.ac.th• www.lip-sas.fr • Nematophagous Fungi: Guide by Philip Jacobs, BRIC-

Version (http://www.biological-research.com/philip-jacobs%20BRIC/ar-dact.htm)

• http://www.mycolog.com/CHAP4a.htm

And Thanks And Thanks to…to…• http://www.biology.ed.ac.uk/research/groups/jdeacon/

microbes/applerot.htm• http://bugs.bio.usyd.edu.au/Mycology/UsesOf_Fungi/

industrialProduction/foodProcessing.shtml• http://www.virtualmuseum.ca/~mushroom/English/Species/

penicilliumroquefortii.html• http://www.cals.ncsu.edu/course/pp318/profiles/

deuteromycetes/deutero.htm• http://www.cababstractsplus.org/google/abstract.asp?

AcNo=20056401109• http://web.umr.edu/~microbio/BIO221_1998/P_roquefortii.html• http://www.cs.cuc.edu/~tfutcher/Deuteromycota.html• Tom Volk's Fungus of the Month for February 1998,

http://botit.botany.wisc.edu/toms_fungi/feb98.html• http://lynx6663.tripod.com/deuteromycota.html

Presented byPresented by• Group 10Group 10 Ernest Nathan L. Nogales Jess Ramirez Lennart Panton

• Group 5Group 5 Athena Aherrera Mai Dealino Rocelle Mendoza

deuteromycota

Technology

deuteromycota deuteromycota

sphaeropsidales deuteromycota

phylum deuteromycota

sporangium deuteromycota

sexual life cycle

spores conidia

human foot

type of fungi