transport in plants - find people
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Transport in Plants
I. Overview
II. Absorption of water in Roots
III. Transport of xylem sap
IV.Control of transpiration
V. Transport of phloem sap
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I. OverviewTransport of solutes into the root
•Helps to create water movement•Solutes= # of molecules•osmosis
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Differences in water potential
• Three components• Total water potential (ψw)• Pressure potential (positive/negative) ψp
• Solute potential (ψs)
Ψw = ψp + ψs
•Units are MPa
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Water potential and movement
•Osmotic movement of water•aquaporins
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Absorption of water in Roots
•Symplast = living tissue•Apoplast = cell wall space
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Transport of xylem sap•Properties of water•Adhesion•Cohesion•Tension
• Root Pressure
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Ascent of Sap
• Transpiration-Cohesion-Tension Theory
• Solar driven• Water potential of air• Relative humidity
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Control of transpiration
• Guard cells• Photosynthesis-
transpiration compromise
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Mechanism of guard cell opening
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Environmental control and adaptations
• Light (Blue light/Red light)
• Water (drought)
• Carbon dioxide (concentration in leaf/around leaf)
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Adaptations
• Xerophytes• CAM plants• Leaf hairs• Sunken stomata
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Xerophytic Adaptations
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Transport of phloem sap
• Source (photosynthetic tissue• Sink (new leaves, seeds, roots• Bidirectional flow• Phloem• Requires energy• Transport of sugars (sucrose), amino
acids, potassium, and hormones
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Munch Pressure Flow Hypothesis