Chapter 29

Chapter 29 - Chapter 29 Plant Diversity I: How Plants...

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Chapter 29 Plant Diversity I: How Plants Colonized 1) Land Plants Evolved From Green Algae a) Charophyceans have been identified s the closest relatives of land plants 2) Four Key Traits Land Plants Share with Charophyceans a) Rose-shaped complexes for cellulose synthesis b) Peroxisome enzymes c) Structure of flagellated sperm d) Formation of phragmatoplasts 3) Genetic Evidence a) Comparisons of nuclear and chloroplast genes point to close relationships between chlorophytes and land plants 4) The Move to Land a) Durable polymer sporopollenin found in charophyceans and land plants i) Prevents spores from drying out b) Great opportunity for adaptive radiation i) Sunlight unfiltered by water and plankton ii) Abundance of CO2 iii) Nutrient rich soil iv) Few herbivores and pathogens 5) Defining the Plant Kingdom a) Systematics are currently debating the boundaries of the plant kingdom b) Some want to include some or all of the green algae c) We will use embryophyte definition of the kingdom Plantae 6) Land plants possess a set of derived terrsestial adaptations 7) Five key traits appear in nearly all land plants a) Apical Meristems b) Alternation of Generations c) Walled spores produced in sporangia
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Chapter 29 - Chapter 29 Plant Diversity I: How Plants...

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