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Transpiration + translocation

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Mind Map on Transpiration + translocation, created by rachbreen on 08/05/2013.
rachbreen
Mind Map by rachbreen, updated more than 1 year ago
rachbreen
Created by rachbreen over 12 years ago
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Resource summary

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