Announcements Urban Forestry project continues!!! Discussion on reading.
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Transcript of Announcements Urban Forestry project continues!!! Discussion on reading.
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Announcements
Urban Forestry project continues!!!
Discussion on reading.
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Reading
Natural shattering of seed in rice.
Genes of large effect vs. many genes of small effect
QTL analysis – what is it?
Crossing studies –
Regulation of abscission very important to plants
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What do you think are the What do you think are the most important questions?most important questions?
How can the many How can the many challenges we face be challenges we face be
resolved?resolved?
Conservation BiologyConservation Biology
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Plant diversity
Will start following the book much more closely.
Would be useful to bring your books to class.
Chapter 7 for today's lecture
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Evolution of plant diversity
Endosymbiosis has evolved several times, including several separate events creating 'chloroplasts'
Figure 7.1
Figure 7.2
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Algae
Red Algae (Rhodopytes)
Brown Algae (Phaeophytes)
Diatoms (Bacillariophytes)
Dinoflagellates
Chlorophytes– Chara
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Red Algae
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Red Algae
Typically in deep water
Often 'crustose'
Quite poorly known with very complicated life cycles
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Brown Algae
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Brown Algae
Kelp forests
'Plant-like' growth forms
Middle depth and often have organs that allow them to float.
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Diatoms
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Diatoms
Abundant and diverse in both marine and freshwater environments
Must go through sexual reproduction to restore size because of morphology.
Diatomaceous earth – an effective way to get rid of a flea infestation.
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Dinoflagellates
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Dinoflagellates
Unique morphology with two flagellae located in grooves.
Form important symbioses with reefs, sponges, and squids – zooxanthellae.
Diatomaceous earth – an effective way to get rid of a flea infestation.
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Chara - “muskgrass”
A likely ancestor of all land plants
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Algae as biofuels.
Many of the major players in the energy industry are moving away from this idea though.
Craig Venter has a team working on it.
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Evolution of plant diversity
Figure 7.6
Invasion of land
“Bryophytes”?
Liverworts, Hornworts, and Mosses
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Liverworts
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Liverworts - Marchantia
Thallus – flattened body
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Hornworts
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Hornworts
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Evolution of plant diversity
Figure 7.8
Tracheophytes
Lycophytes
Monilophytes – Psilotum, Ophioglossus, Equisetum
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Algaophyton
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Lycophytes – Lepidodendron
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Lycophytes - Selaginella
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Lycophytes - Lycopodium
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Equisetum