Transpiration - Western Oregon Universitywou.edu/~guralnl/gural/330Transpiration.pdf ·...
Transcript of Transpiration - Western Oregon Universitywou.edu/~guralnl/gural/330Transpiration.pdf ·...
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Transpiration
• Overview• Ascent of water• SPAC• Environmental factors
& Transpiration
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Overview
• Role of transpiration• Ion transport: moves
ions, mineral nutrition• Water uptake• Energy exchange:
Heat loss• Movement through
xylem: vessels & tracheids
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Ascent of Water in Plants
• Root pressure Guttation through hydathodes
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Tall trees: gravity component, atmospheric pressure
• Capillarity in apoplast
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Xylem: tracheids and vessels
• Pits• Tapered ends• End plate• Tension of -2 to -30
MPa• Dilute solution of
water and ions
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Tension in xylem
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xylemEmbolism
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Water potential of air
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SPAC
• Soil-Plant-Air continum• Movement of water due to properties• Cohesion-adhesion• Water potential gradient• Evaporation of water into air• Vapor pressure deficit• Relative humidity
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Air space in leaf
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Vapor pressure deficit
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Effect of temperature
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Water uptake in Roots
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Mangrove
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Transpiration
• T α eleaf – eair
• Resistance due to stomatal factors
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Environmental factors
• Relative humidity of air
• Wind• CO2
• Leaf size and boundary layer
• Stomatal factors• Light
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Boundary layer