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Lecture 12

2013BIOAO2 Lecture 12.docx

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Department
Biological Sciences
Course
BIOA02H3
Professor
Ivana Stehlik
Semester
Winter

Description
2013BIOAO2 S Module 1 January 7 ~Feb1 2013 Midterm date: Monday Febuary 4 2013. 5-7pm Module 2: Begins on Tuesday Feb 5 . th Total: 12 lectures Lecture outline: 1-2: Tree of life-plants 3-4 Plant cells and plant tissues 5-6. From seed to tree 7-8. From tree to seed 9. Transport in plants 10. Plant nutrition and soils 11. Plant defense 12. Plant life on the edge. Lecture 12 notes (Plant life on the edge) Evolution in action:  Adaptation in huge range of habitat  Frost, heat, drought  Perpetual abundance in salt water  Toxic soils (heavy metals)  Extreme nutrient limitation  Low light. Freshwater environment limiting factors: carbon dioxide , oxygen , light mainly found in surface of water and not below surface , nutrients , moving water that drags the plants Adaptations of aquatic plants: Figure 1. It shows 6 different diagrams. (from left to right) 1 is submerged plants. 2~6 are floating & emergent leaves. 4~5 are Free roots and no root examples A) Submerged plants Submerged Plants don’t break through the surface Greatest number of adaptations  Poor xylem o Reduced xylem. Tissues bathed in water, little need for directed water transport. o E.g water lily (have 2 cell of xylem) , Nymphaea, non-woody land plant. ( developed xylem)  No mechanical strengthening o Buoyancy, water support because no xylem, so don’t need structure support o E.g River water crowfoot o Submerged plants have narrow dissected leaves. Mainly use veins o Central vascular bundle (stem) where veins are located at centre to withstand water current. o E.g potamogenton pectinatus , aponogeton madagascariensis, myiophyllum aquaticum  Maximum surface to volume ratio o Close centre interla center, fast diffiusion of carbon dioxide to chlorophlast.  Thin cuticle, no stoma o Thin leaves (sometimes 1~2 cell layer thick) o E.g Elodea canadensis  Adapted intercellular air space o In leaves of submerged tissues, there is reduced air space where
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