Translocation Flashcards

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1
Q

What is translocation?

A
  • mass transport of assimilates from source to sink via the phloem
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2
Q

Describe what happens in translocation?

A
  • hydrogen ions are actively pumped from inside the companion cells to outside
  • hydrogen ions move down concentration gradient via co transport proteins that also transport sucrose
  • sucrose in companion cells move to the sieve tube elements via the plasmodesmata
  • there is a lower water potential in the sieve tube elements so water moves from companion cells
  • mass flow of assimilates from an area of high pressure to low
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3
Q

What is transpiration?

A
  • the loss of water vapour from leaves
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4
Q

What are the factors that affect transpiration?

A
  • light intensity
  • temperature
  • air movement
  • humidity
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5
Q

Why is sucrose transported as an assimilate and not glucose?

A
  • because glucose is reactive and so can take part in reactions on the way
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