Begin w Baker - Harbingers of spring. Lecture Notes, Dr....

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Lecture Notes, Dr. Baker The evolution of plants Second half of Biology 102 Harbingers of spring… The Tree of Life Two major themes 1. Evolution of complexity Morphology, physiology, behavior Three major lineages: Plants, fungi, animals 2. Adaptation to life on land Challenges to moving onto land 1. Dessication (drying out) 2. Dispersal / mating 3. Uptake/absorption of water and nutrients 4. Support
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But… it was also the land ” of opportunity! 1. Space, space, space! 2. Light (esp. important for plants) 3. CO 2 (plants) + O 2 (animals, mostly) predation competition Big picture vs. details As we proceed “upwards” in time, the picture we see of life becomes “bigger”. But… life also becomes more complex, and thus there are even MORE details! Yikes! If you really want to be a biologist, then you need to understand the “big picture”, but you should WANT to know the “details”. Plant Diversity: Colonization of the land Readings: Ch. 29
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Where did plants come from, in an evolutionary sense? (That is… what was the ancestor of plants?) How can we tell when we have a plant? 1. Eukaryotic 2. Multicellular 3. Photosynthetic autotrophs Chlorophylls a + b 4. Cell walls composed of cellulose 5. Chloroplasts derived by primary endosymbosis Euglena All unicellular forms, however… Ceratium Protoperidinium Alveolata Dinoflagellates Again, all unicellular forms… Stramenopiles include multicellular forms…
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Red algae Chlorophytes (green algae) One line of evidence suggesting that plants evolved from a green alga is that both have chloroplasts with two membranes… That is, the chloroplasts in each were derived via primary endosymbiosis However, this is also true of red algae Fig. 28.3 Fig. 10.10 Green algae + plants: Chlorophylls a + b Red algae: Chlorophyll a + “phycobilins” Stramenopiles: Chlorophylls a + c Fig. 28.4 Suggested by molecular evidence…
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This note was uploaded on 04/24/2008 for the course BIOL 102 taught by Professor Baker/robertson during the Fall '08 term at Clark University.

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Begin w Baker - Harbingers of spring. Lecture Notes, Dr....

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