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Lecture+17+W+2012

Lecture+17+W+2012 - Vascular plant synapomorphies...

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Vascular plant synapomorphies – Sporophyte Dominant life cycle example: Fern Life Cycle – Vascular Tissue • xylem • phloem Early clades of vascular plants – Rhyniophytes – Lycophytes (club mosses, etc) – Pteridophytes (Ferns and relatives) Relationships in early clades – Megaphylls – Chloroplast DNA inversion Lecture 17: Vascular Plants 2
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Xylem H 2 O H 2 O Root Leaf Stem xylem Xylem stomata Transpiration–Cohesion–Tension Mechanism
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• 200 - 400 Liters PER DAY can be lost by a tree • no energy required for water movement. • Water can be moved up to the tips of giant redwoods Figure 35.6 The Transpiration– Cohesion–Tension Mechanism Amazing facts -Transpiration
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Sieve tube element Companion cell Phloem Cells
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Clicker question Vascular tissue in land plants performs the following functions: A. Transport of water B. Support of the plant body C. Transport of carbohydrates D. A and C but not B E. A, B and C
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Vascular plant synapomorphies – Sporophyte Dominant life cycle example: Fern Life Cycle – Vascular Tissue • xylem • phloem Early clades of vascular plants – Rhyniophytes – Lycophytes (club mosses, etc) – Pteridophytes (Ferns and relatives) Relationships in early clades – Megaphylls – Chloroplast DNA inversion Lecture 17: Vascular Plants 2
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Rhyniophytes (extinct) The Rhyniophytes
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The Rhyniophytes http://www.abdn.ac.uk/rhynie/flora.htm
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Reconstruction of a Rhyniophyte http://www.abdn.ac.uk/rhynie/flora.htm XY PH
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Reconstruction of a Rhyniophyte
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Clicker question The Rhyniophytes were DISTINCT from the “Bryophytes” in having : A. A sporophyte that was branched with terminal sporangia B. Vascular tissue C. Rhizoids D. All of the above E. A and B above
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Rhyniophytes (extinct) The Rhyniophytes True roots
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Vascular plant synapomorphies – Sporophyte Dominant life cycle example: Fern Life Cycle – Vascular Tissue • xylem • phloem Early clades of vascular plants – Rhyniophytes – Lycophytes (club mosses, etc)
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