Plant Diversity I - Plant Diversity I-All land plants...

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Plant Diversity I -All land plants derived from terrestrial algae Pleisiomorphic Traits of Plants and Algae • Shared Ancestral Traits: o Eukaryote o Multicellular o Photosynthetic o Cell walls (cellulose) • Synapomorphic Traits of Plants and Charophyceans: o Charophyceans are closest relatives of plants; often inhabit shallow, ephemeral waters o Key synapomorphic traits: Rose-shaped complexes for cellulose synthesis W Peroxisome enzyme for photorespiration Formation of a phragmoplast (specialized microtubules) Terrestrial Adaptations • Cuticle: epidermal polymers that act as waterproofing • Sporopollenin: durable polymer that prevents spores/ pollen from drying out Derived Plant Traits 1. Apical meristems a. Meristem: undifferentiated cells allowing growth b. Above ground shoots obtain light and CO2 c. Below ground roots obtain H2O/ minerals
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2. Alternation of generations a. Multicellular 2n individual alternates with multicellular n individual 3. Sporangia with walled spores 4. Multicellular gametangia
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Plant Diversity I - Plant Diversity I-All land plants...

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