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77837
Transpiration + translocation
Description
Mind Map on Transpiration + translocation, created by rachbreen on 08/05/2013.
Mind Map by
rachbreen
, updated more than 1 year ago
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Created by
rachbreen
about 11 years ago
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Resource summary
Transpiration + translocation
Transpiration
Loss of water vapour from aerial part of a plant
Inevitable process of photosynthesesis.
Stomata are open for gaseous exchange
Osmosis from xylem vessels to mesophyll cells
Evaporation mesophyll into air spaces
Diffusion of water vapour through stomata
Increase
No of leaves (SA)
Density of stomata
Light intensity
Temperature
Wind Speed
Decrease
Thick waxy cuticle
Specialised adaptions
Xerophytes
Smaller leaves
Thick waxy cuticle
Dense spongy mesophyll reduces air spaces
Hair on suface = moist trapped air, lower WP
Sunken stomata pits = moist trapped air, lower WP
Humidity
Translocation
Movement of assimilates
Sink - removes sucrose from phloem
Source - releases sucrose into phloem
Leaf = source, sucrose produced
Sucrose moves to phloem, active transport
High to Low
Water moves down phloem, and contents down sieve elements
Contents move to sink (bud)
High to Low
Sucrose into sink via facilitated diffusion
H+ pumped out of companion cell
Ions diffuse back into companion cell, with sucrose - facilitated diffusion
Sucrose, HIGH TO LOW into sieve tube elements
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