Botany Transportation water

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Water transport functions
- solvent for metabolic reactions
- hydrates complex organic molecules
- chemical reactant
- under turgor pressure, provides rigidity
- solute transport
water moves in response to differences in water potential
water potential is the difference between the potential energy of pure water and that of water in the system
transpiration
- loss of water of vapor
- soil to root to stem to leaf to atmosphere
apoplast

continuum of cell walls and air spaces in a plant
symplast

interconnected protoplasts and plasmodesmata
waters pathway in a leaf
- moves from xylem to mesophyll cells along pressure gradient
- evaporates from mesophyll
- diffuses out of leave via stomata
cohesion adhesion tension theory
- continuous column of water is pulled along a continuous gradient
- cohesion of water molecules
- adhesion of water molecules to vessel walls
- tensile strength of water in vessel elements
water mainly moves through non-living cells or between cells
Factors affecting transpiration rate
- temperature
- water potential of air
- wind
- presence of leaves
- leaf anatomy
- plant's photosynthetic pathway
- stomatal opening and closing
leaf anatomical traits that reduce transpiration rates
- trichomes on leaf surface
- multi-layer epidemics
- thick cuticle
- tightly-packed mesophyll
- fewer stomata
- sunken stomata
- reduced leaf area
deciduous

lack leaves
Nearly all transpirational water loss occurs through stomata
factors that affect stomata open and close
- leaf carbon dioxide
- leaf water content
translocation

movement of substances in phloem
phloem is the main pathway for sucrose and other dissolved organics

transport from source to sink

Author

jo73

315823

Card Set

Botany Transportation water

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Updated

2016-02-12T09:54:05Z

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