Protists and Fungi 2 Diverse Kingdoms of Life

Protists and Fungi 2 Diverse Kingdoms of Life LAB WARNING!! Code Orange!! Study lab before you arrive! This is an official BIOL 1030 Boyd-alert!!

Domain Eukarya Eukaryotes (review BIOL 1020 notes) Differ from other domains by: 1) multicellularity: body formed of cells which are in contact and coordinate activities Note some eukaryotes are unicellular or colonial (aggregation of cells with little coordination of activities) 2) sexual reproduction: absent from all bacteria known Note some eukaryote groups rarely or never reproduce

sexually (only asexual reproduction has been observed) But, evolution of eukaryotes involved endosymbiosis, incorporation of Eubacteria cells into eukaryotes as mitochondria and chloroplasts. Domain Eukarya The mitochondria of all eukaryotes, and the chloroplasts of photosynthetic ones, evolved from Eubacteria.

Domain Eukarya The mitochondria of all eukaryotes, and the chloroplasts of photosynthetic ones, evolved from Eubacteria. Domain Eukarya Kingdom Protista (protists) Most diverse kingdom in Eukarya Unicellular (single cells) Colonial (loose confederations of cells which

generally do not coordinate activities or specialize to perform particular functions) Multicellular (many cells that do coordinate activities and often become specialized to divide up life functions) Domain Eukarya Kingdom Protista (protists) Artificial group: not based on phylogeny Placed together for convenience and because they

are NOT fungi, animals, or plants Polyphyletic group Note that classifications vary: text and lab use different systems! Fig. 35.4 Kingdom Protista (protists) We will cover them by grouping similar phyla together into 5 general groups:

Heterotrophs with no permanent locomotor apparatus Photosynthetic ones Heterotrophs with flagella Non-motile spore-formers Heterotrophs with restricted mobility. Fig. 35.6 1) Heterotrophs with no

permanent locomotor apparatus Mostly unicellular and ameoba-like: Phylum Rhizopoda (amoebas) Phylum Actinopoda (radiolarians) Phylum Foraminifera (forams). Phylum Rhizopoda (amoebas) Move by pseudopods (flowing extensions of cytoplasm) Lack sexual reproduction, cell walls, flagella

Reproduce asexually only QuickTime and aCinepak decompressorare needed to see this p Amoeba movie Phylum Rhizopoda (amoebas) Many are predators (use pseudopods to engulf other cells). Exception: Vampyrella, the sucking amoeba

Sucks contents of algal cell in matter of seconds. Vampyrella green alga cell Phylum Rhizopoda (amoebas) Hundreds of species: freshwater, marine, soil Some are parasites (feed on host tissues or cells

but usually dont kill host). Phylum Rhizopoda (amoebas) Example: Entamoeba histolytica (cause of amoebic dysentery) Up to 10 million Americans may be infected by parasitic amoebas.

Phylum Actinopoda (radiolarians) Have shells (external skeletons) made of silica (glass) Pseudopods needle-like Marine group. Part of plankton (microscopic floating marine organisms) Valuable fossils for geological record. Pseudopods Beautiful radiolarian

Fig. 35.8 shell Phylum Foraminifera (forams) Marine, make skeleton (called test) of organic material plus sand, calcium carbonate Some float in plankton, most live attached to bottom or other organisms Podia (thin cytoplasmic projections) used for swimming, feeding.

Fig. 35.9 Phylum Foraminifera (forams) Life cycle: sporic meiosis (haploid and diploid generations formed) Important fossil group (200 million years of geological record Limestones often rich in forams (ex, Dover, England).

Fig. 35.10 2) Photosynthetic protists

Phylum Phyrrhophyta (dinoflagellates) Phylum Euglenophyta (euglenoids) Phylum Chrysophyta (diatoms and golden algae) Phylum Rhodophyta (red algae) Phylum Phaeophyta (brown algae) Phylum Chlorophyta (green algae) Phylum Phyrrhophyta (dinoflagellates)

Unicellular, mostly marine: 2100 species Usually 2 flagella, skeleton of plates of cellulose Reproduce mostly by asexual reproduction (sex rare) Chlorophylls a + c Phylum Phyrrhophyta (dinoflagellates)

Important/interesting roles: zooxanthellae: symbionts (live in mutually beneficial relationship) in other organisms (jellyfish, sea anemones, mollusks, corals) Zooxanthellae in corals (up to 30,000 cells per cubic mm or coral tissue) do photosynthesis and carbon products absorbed by corals, helping to make coral reefs one of most productive habitats on Earth!. Phylum Phyrrhophyta (dinoflagellates)

Important/interesting roles: bioluminescent: emit light when disturbed creates sparkling waves and wakes of ships at night why do this? Perhaps to attract predatory fish to eat the predators of the dinoflagellates! QuickTime and aCinepak decompressorare needed to see this picture. A cruising dinoflagellate....

Magnified view of plates on outside of cell Phylum Phyrrhophyta (dinoflagellates) Important/interesting roles: red tides: population explosions (blooms) that can color the water with pigmented dinoflagellate cells toxins in cells can kill marine life

Example, Pfiesteria piscicida: stuns fish with toxin and feeds on body fluids. Phylum Euglenophyta (euglenoids)

Mostly freshwater, unicellular. 1000 species Some photosynthetic (chlorophylls a + b), some not Protein coat called pellicle on outside of cell Important members of food freshwater food chains Example, Euglena. Fig. 35.12 Phylum Chrysophyta (diatoms and golden algae)

Here we emphasize the diatoms: 11,500 species Use chlorophyll a + c, lack flagella Make chrysolaminarin: unique energy storage chemical Cell wall of silica (glass), with intricate designs. Like petri plate, with top and bottom halves. Fig. 35.13

Phylum Chrysophyta Asexual reproduction common, but do gametic meiosis. Importance: 1) grass of the sea. Abundant members of plankton. Do large % of ocean photosynthesis 2) fossil deposits of cell walls called diatomaceous earth.

Mined and used for pest control (applied to insects, gets in appendages and grinds them to death), reflective paints, filters. Phylum Rhodophyta (red algae) Mostly marine (many tropical), multicellular. 4000 species. Lack flagella Have only chlorophyll a: similar to photosynthetic

bacteria called cyanobacteria Reproduction: mostly sporic meiosis (make gametophyte and sporophyte generations). Phylum Rhodophyta (red algae) Importance: Coral reefs: part of reef made of coralline red algae, which have calcium carbonate forming part of cell walls. A coralline

red alga Phylum Rhodophyta (red algae) Importance: Agar and carrageenan (cell wall chemicals) are extracted from some red algae Used as emulsifiers and thickeners (chocolate milk, ice cream, cosmetics, jellies, microbiology medium, etc.) Red alga used for

carrageenan extraction Phylum Phaeophyta (brown algae) Marine (cold water), multicellular: 1500 species Chlorophylls a + c Reproduction often sexual: sporic meiosis (sporophyte and gametophyte generations) Phylum Phaeophyta (brown algae) Large species called kelps

Form kelp forests: important shallow water habitats. Sea otters depend on kelp forests Phylum Phaeophyta (brown algae) Kelps also harvested for cell wall materials called alginates: used as thickeners in foods and other

products. Phylum Chlorophyta (green algae) Mostly aquatic (some on most terrestrial surfaces), marine and freshwater: 7000 species Unicellular to multicellular Chlorophylls a + b Phylum Chlorophyta (green algae) Unicellular motile example: Chlamydomonas

To be seen in lab: note zygotic meiosis and asexual reproduction in haploid phase. QuickTime and aCinepak decompressorare needed to see this picture. Phylum Chlorophyta (green algae) Motile (swimming) colonial example: Volvox To be seen in lab: note daughter colonies (made asexually inside main sphere).

QuickTime and aCinepak decompressorare needed to se Phylum Chlorophyta (green algae) Parenchymatous (3-D body) form: Ulva (sea lettuce) To be seen in lab: note life cycle is sporic meiosis where gametophyte and sporophyte look identical (isomorphic alternation of generations)!

Phylum Chlorophyta (green algae) Importance: producers in aquatic ecosystems (base of food chains) human/animal nutritional supplement? Chlorella in the news.... The miracle of chlorella growth factor! Phylum Chlorophyta (green algae) Evolutionary Importance

Land plants (Kingdom Plantae) evolved from a line of green algae. Fig. 32.12 3) Heterotrophs with flagella Phylum Sarcomastigophora (zoomastigotes) Phylum Ciliophora (ciliates) Phylum Sarcomastigophora

(zoomastigotes) Mostly unicellular, often with flagella Here we emphasize Class Zoomastigophora, especially a group called the trypanosomes Most reproduction is asexual.

Phylum Sarcomastigophora (zoomastigotes) Some trypanosomes are parasites that cause serious human diseases: African sleeping sickness: Caused by Trypanosoma Carried to new host by biting fly (tsetse fly) Affects cattle and prevents livestock culture in large area of Africa. Fig. 35.18

Phylum Sarcomastigophora (zoomastigotes) Some trypanosomes are parasites that cause serious human diseases: Leishmaniasis (caused by Leishmania) Carried to new host by biting fly (sand fly) in tropical areas Causes sores and erosion of skin (4 million people/yr).

Lesion on ear Phylum Sarcomastigophora (zoomastigotes) Some trypanosomes are parasites that cause serious human diseases: Giardiasis caused by Giardia lamblia Infects humans and some other animals (dogs). Found across U.S.

Causes nausea, cramps, diarrhea. Fig. 35.19 Lesion on ear Giardia cells in intestine Phylum Sarcomastigophora (zoomastigotes)

Some trypanosomes are gut symbionts: Trichonympha in guts of termites (Order of insects) Digest cellulose in wood for insect, receive home in gut. Worker termites

Trichonympha cells Phylum Ciliophora (ciliates) Unicellular (but some big and internally complex) 8000 species Most with many cilia Also have 2 types of nuclei: macronucleus (large) and

micronucleus (small) Outer covering (called pellicle) of tough protein material Fig. 35.21 Phylum Ciliophora (ciliates) Do sexual reproduction by

conjugation (exchange of micronuclei). Phylum Ciliophora (ciliates) Examples, Paramecium and Stentor Cilia used for locomotion and for

feeding. QuickTime and aCinepak decompressorare needed to s Stentor in motion Paramecium Stentor

4) Nonmotile spore-formers Phylum Apicomplexa (sporozoans) Phylum Apicomplexa (sporozoans) Unicellular, do not make cilia/flagella: 3900 species All are parasites of animals Spores are infective bodies used to reach new hosts Cell structure unique: on end (apex)

of cell has concentration of organelles. Phylum Apicomplexa (sporozoans) Example, Plasmodium Cause of malaria Complex life cycle: uses mosquito and human as host One of most serious

diseases worldwide: 500 million cases/yr (2 million deaths). Fig. 35.23 Attacked by mosquito control (often insecticides) and antimalarial drugs Problem: both mosquitoes and Plasmodium evolve resistance to control chemicals

Maybe develop vaccine?. Malaria risk map 5) Heterotrophs with restricted mobility Phylum Oomycota (oomycetes) Phylum Acrasiomycota (cellular slime molds) Phylum Myxomycota (plasmodial slime molds) Phylum Oomycota (oomycetes)

All are parasites or saprobes (feed on dead organic matter). About 600 species Cell walls present (cellulose) Gametic life cycles (like us!) Make asexual spores by mitosis: called mitospores. As with all spores, one can form new organism without joining with another cell. If swimming mitospore, called a zoospore. May form threadlike cells One called hypha (pl. hyphae).

Phylum Oomycota (oomycetes) Importance: some cause diseases of plants or fish Example, late blight of potato (Phytophthora). Irish Potato Famine Irish peasants depended on potatoes as staple food 1845-1847, late blight of potato struck

Destroyed crops 1 million Irish starved to death, 1 million emigrated (many to U.S.). How many of the Fighting Irish got here. Phylum Acrasiomycota (cellular slime molds)

Weird group: 70 species. Amoeboid cells Join together for form mass called slug Makes spores.

Phylum Myxomycota (plasmodial slime molds) Another weird group (700 species). Plasmodium is multinucleate mass of cytoplasm Flows around in moist areas, ingesting unicells and organic matter Example, Physarum. Fig. 35.26

Phylum Myxomycota (plasmodial slime molds) Later form meiospores with cellulose walls Note a spore-containing structure often called a sporangium (angios from Greek for vessel) Plural is sporangia. Fig. 35.28

Kingdom Fungi Unlike Protista, are monophyletic group Large: about 77,000 named species Many more remain to be discovered. General fungal traits Terrestrial heterotrophs (digestion is external: enzymes secreted and food absorbed from solution) Cell walls of chitin

Unique type of mitosis (nuclear mitosis: where nucleus divides within nuclear membrane) Do not make swimming cells (lack cilia and flagella) Reproduce by spores sexual spores are meiospores (formed by meiosis) asexual spores are mitospores (formed by mitosis). General fungal traits Most cells are threadlike and tubular (hyphae)

Mass of hyphae called mycelium. Fig. 36.4 General fungal traits Some hyphae lack crosswalls (coenocytic hyphae) Some hyphae have

crosswalls (septate hyphae) General fungal traits Sexual reproduction: zygotic meiosis Haploid phase predominates BUT, syngamy fertilization has 2 steps Plasmogamy: union of gamete cells Karyogamy: union of gamete nuclei

Some fungi do plasmogamy but delay karyogamy, forming cells that have separate haploid nuclei. These hyphae called dikaryotic. Example of fungal life cycle with dikaryotic hyphae: mushroom

Dikaryotic mycelium is major phase Only when mushroom is formed does karyogamy occur, followed by meiosis.

General fungal traits Karyogamy Fungal Phyla 3 phyla but 4 groups Phyla separated mainly by how meiospores are formed (how sexual reproduction done) Phylum Zygomycota (zygomycetes or bread molds): Meiospores made by

zygosporangium (resistant microscopic structure). Fungal Phyla 3 phyla but 4 groups Phyla separated mainly by how meiospores are formed (how sexual reproduction done) Phylum Ascomycota (ascomycetes or sac fungi): Meiospores made in sac-like ascus. Asci (plural) containing in fruiting body

called ascoma (plural ascomata). Fungal Phyla 3 phyla but 4 groups Phyla separated mainly by how meiospores are formed (how sexual reproduction done) Phylum Basidiomycota (basidiomycetes or club fungi): Meiospores made on club-like basidium. Basidia (plural) contained in fruiting body called basidioma (plural

basidiomata). Fungal Phyla 3 phyla but 4 groups 4th group? Fungi that dont make meiospores (to our knowledge) Reproduce only asexually (by mitospores) Called Imperfect Fungi Not a true phylum but a temporary holding group.

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