Lecture 8 posted new - BIO 311D LECTURE 8 Plant evolution...

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BIO 311D LECTURE 8 Plant evolution and life cycles
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1. Multicellular, autotrophic eukaryotes 2. Photosynthetic 3. Cell walls for support 4. No nervous or muscle tissue 4. Sexual and asexual reproduction 6. Homeoboxes are not located in Hox genes Plants, ONLY land plants, can be defined as:
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Four main groups of land plants - In the order in which they evolved: Bryophytes - mosses Pterophytes – ferns Gymnosperms – conifers Angiosperms – flowering plants
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Living land plants – compare the number of species among the groups
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Movement from oceans to land: required adaptations to deal with constraints: 1. Surface area vs. volume 2. Gravity 3. Aridity 4. Nutrient uptake 5. Salinity
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1. Surface area vs. volume ratio This constraint isn’t really due to moving onto land, but affects the following constraints
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Adaptation to constraint #1: Transport systems And to make transport systems more efficient: Enzymes Transport proteins Extracellular matrix
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2. Gravity – is it stronger on land?
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Adaptations to #2: Structural support cellulose collagen
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3. Aridity
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Adaptations to #3 Water conservation Change in fertilization
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4. Nutrient uptake
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Adaptations to #4: Apical meristems Root and shoot system Mycorrhizae
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5. Salinity A change from salty ocean water fresh water
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Adaptations to #5 Change in physiology
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This note was uploaded on 01/31/2011 for the course BIOLOGY LE 49610 taught by Professor Hofmannjohann during the Summer '10 term at University of Texas at Austin.

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Lecture 8 posted new - BIO 311D LECTURE 8 Plant evolution...

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