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Lecture%209%20life%20in%20water

Lecture%209%20life%20in%20water - Back in the water Click...

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Click to edit Master subtitle style 2/20/11 Back in the water
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2/20/11
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2/20/11
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2/20/11 Back in the water Moving to dry land required the evolution of several features. Key advances included Body support (roots, lignin, vascular tissue) Transport of material (vascular tissue) Reproduction (pollen) Development and dispersal of embryo (seeds)
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2/20/11
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2/20/11 Aquatic plants Two main groups Freshwater Salt water
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2/20/11 Freshwater zonation Emerge nt
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2/20/11 Freshwater zonation Submerged (this is actually an algae)
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2/20/11 Freshwater zonation Floati ng
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2/20/11 What are the problems that plants face in waterlogged Primarily the lack of oxygen. The root systems are unable to respire and the plant will quickly die. Ethanol and other metabolites will also build up and poison the root tissue
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2/20/11 How do plants survive flooding? The key to survive flooding is to make sure that oxygen reaches the roots. Pneutmatophores (trees) Hollow stems Root aerenchyma Essentially enlarged intercellular spaces
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Plants with most of their shoots above the water surface need very few adaptations aside from a aerenchyma.
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Click to edit Master subtitle style 2/20/11 Emergent aquatic plants often have larger and less dissected leaves than Why might you expect to find small dissected leaves on terrestrial plants but not on aquatic?
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