Protists Eukaryotic Organisms. Protists Protists: Eukaryotic microorganisms in the Protist family.
The protists are the most basal eukaryotes -Every eukaryrote that is not a plant, animal, of fungus...
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The protists are the most basal eukaryotes
-Every eukaryrote that is not a plant, animal, of fungus is a protist (negative definition)
-Phylogeny not well resolved
-Evolved mitochondria and chloroplasts
-Evolved sex
-Evolved multicellularity
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Chapter 21 Key points:
Fungi were the first to colonize land
What are the characteristics of fungi?
How are fungi classified?
What are the roles of fungi?
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Which would you rather colonize?
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Fungal associations with cyanobacteria allowed colonization of land
Lichens
-Form “symbiotic” relationship with cyanobacteria
-Fungi digests rock, supplies minerals to cyanobacteria
-Cyanobacteria fixes CO2 into food source
-Result in break down of rock into soil, lichens become organic matter
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Fungi are a “true” multicellular organism - not much specialization but cell activities are highly coordinated
Cells are connected, share cytoplasm
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Cells are arranged in filaments called hyphae
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Filaments can make elaborate structures
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Fungi are heterotrophs
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Most cells are in contact with environment
Secrete digestive enzymes, absorb minerals and nutrients from surrounding
Filamentous structure allows sharing of resources, can grow according to environment
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What are the pros and cons of classification based on characteristics of reproduction?
Fungi are classified by details of reproduction
All can reproduce asexually and sexually
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Fungi are decomposers
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Important in decay of wood - lignin, cellulose are difficult to break down
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Fungi are pathogens and predators
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Can feed on living organisms
Major problem for plants
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Oyster mushrooms secrete chemical cue that attracts nematode worms, then anesthetizes and digest them
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Fungi have commercial uses
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Yeast
- General term for ~250 species of secondarily signle celled fungi
- Used in alcohol production, baking
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Reproductive structures (mushrooms) are a major food source
- Penicillin is derived from fungus
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Fungal symbiotic association with plant roots (mycorrhyizae) was pivotal in plant evolution
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Effect of mycorrhizae on soy bean plant growth
Augment root structure of plants
Assist in uptake of minerals
Receive food from plant
First fossil plants had mycorrhizae, likely aided terrestrial colonization
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Chapter 21 Key points:
Fungi were the first to colonize land - Lichens
What are the characteristics of fungi? - Heterotrophic, multicellular, filamentous
How are fungi classified? - Based on details of reproduction
What are the roles of fungi? - Decomposers, pathogens, commercial, symbiotic