Chapter 29

Chapter 29 - Chapter 29 I II Plant Diversity I How Plants Colonized Land a The ancestors of land plants are considered to be i Bryophytes

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Chapter 29 I. Plant Diversity I: How Plants Colonized Land a. The ancestors of land plants are considered to be i. Bryophytes ii. Charophyceans**** iii. Chlorophytes iv. Rhodophytes II. Concept 29.1: Land plants evolved from green algae i. Charophyceans have been identified as the closes relatives of land plants b. Four Key Traits Land Plants Share with Charophyceans i. Rose-shaped complexes for cellulose synthesis ii. Peroxisome enzymes iii. Structure of flagellated sperm iv. Formation of phragmatoplasts 1. Responsible for laying down the new cell wall c. Genetic evidence i. Comparisons of nuclear and chloroplast genes point to close relationships between Charophytes and land plants d. The Move to Land i. Durable polymer around their spores called sporopollenin found in Charophyceans and land plants 1. Prevents spores from drying out
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ii. Great opportunity for adaptive radiation 1. Sunlight unfiltered by water and plankton 2. Abundance of CO2 3. Nutrient-rich soil for growth 4. Few herbivores and pathogens a. Allows them to occupy new habitats and form new species very rapid e. Four Key Traits in nearly all Land Plants i. Alternation of generations and multi-cellular, dependent embryos ii. Apical meristems iii. Walled spores produced in sporangia iv. Multicellular gametangia f. Relationships among plant groups i. Within the plants, we see 3 basic groups: 1. Seedless, nonvascular plants (plants neither produce seeds nor do they have vascular tissue to transport water and nutrients to its body) a. First terrestrial plants i. Liverworts, hornworts, mosses 2. Seedless vascular plants (has it to produce water and no seeds) a. Lycophytes b. Pterophytes 3. Seed-bearing vascular plants
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a. (Which includes gymnosperms and angiosperms)
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This note was uploaded on 02/26/2009 for the course BIOL 1202 taught by Professor Gregg during the Spring '08 term at LSU.

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Chapter 29 - Chapter 29 I II Plant Diversity I How Plants Colonized Land a The ancestors of land plants are considered to be i Bryophytes

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