Lecture+18+W+2012

Lecture+18+W+2012 - Seedless Vascular Plants -...

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Unformatted text preview: Seedless Vascular Plants - relationships On the road to seeds Heterospory Selaginella example Advantages of heterospory Seed plant synapomorphies Secondary growth in vascular tissue Formation of bark Axillary branching Seeds Seed Plants groups Gymnosperms Angiosperms Lecture 18: Heterospory and seed Which tree is preferred from this character matrix? A. B. Dichotomous Branching Leaves Roots Rhyniophytes yes none no Whisk Ferns yes microphylls no Horsetails no microphylls yes Lycophytes some microphylls yes Most ferns no megaphylls yes seed plants no megaphylls yes Fossil data changes our view Dichotomous Branching Leaves Roots Chloroplast DNA inversion Rhyniophytes + none no no Whisk Ferns + microphylls no yes lycophytes + microphylls yes no Horsetails - Reduced megaphylls yes yes Most ferns - megaphylls yes yes seed plants - megaphylls yes yes Preferred tree Fossil relatives of horsetails had megaphylls!!! Based on fossil record!! Dichotomous Branching Leaves Roots Chloroplast DNA inversion Rhyniophytes yes none no no Whisk Ferns yes microphylls no yes lycophytes some microphylls yes no Horsetails no microphylls yes yes Most ferns no megaphylls yes yes seed plants no megaphylls yes yes A B C D E F G A B F E D C G DNA inversion Preferred tree DNA analysis changes our view!!! Megaphylls , Seedless vascular plant relationships Rhyniophytes (extinct) chloroplast DNA inversion True roots Seedless Vascular Plants On the road to seeds Heterospory Selaginella example Advantages of...
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Lecture+18+W+2012 - Seedless Vascular Plants -...

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