Maloof_Lect17A_Vasc_II

Maloof_Lect17A_Vasc_II - Lecture 17, Feb 5: Vascular Plants...

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Unformatted text preview: Lecture 17, Feb 5: Vascular Plants II Plant Vasculature Xylem Phloem Leaves Microphylls and megaphylls Overview of vascular plant clades Case study: whisk fern placement Life cycle innovations: heterospory Plant tree of life Xylem: Tracheids http://www.steve.gb.com/science/plant_growth.html Steve Cook. Available under GNU FDL . Xylem: Tracheids + Vessels http://www.steve.gb.com/science/plant_growth.html Steve Cook. Available under GNU FDL . vessel tracheid Xylem: vessel perforation plate http://www.steve.gb.com/science/plant_growth.html Steve Cook. Available under GNU FDL . Perforation Plates: Large openings in the cell wall at the ends of vessel elements allow for efficient water flow. Figure 35.6 The Transpiration CohesionTension Mechanism Xylem H 2 O H 2 O Root Leaf Stem xylem Xylem stomata Amazing facts: transpiration 200 - 400 Liters PER DAY can be lost by a tree no energy required for water movement. Phloem Cells Sieve tube element Companion cell Transport Link to animation Lecture 17, Feb 5: Vascular Plants II Plant Vasculature Xylem Phloem Leaves Microphylls and megaphylls Overview of vascular plant clades Case study: whisk fern placement Life cycle innovations: heterospory Figure 28.10 Microphylls Vascular tissue Sporangia Sporangium Microphyll Lycopodium (club moss) Microphylls: leaves with a single vein Figure 28.10 Megaphylls Overtopping Adiantum (fern) Webbing Megaphylls: leaves with multiple veins Planation Lecture 17, Feb 5: Vascular Plants II...
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Maloof_Lect17A_Vasc_II - Lecture 17, Feb 5: Vascular Plants...

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