Biology F211 - Translocation

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  • Created by: katie
  • Created on: 14-05-13 22:16
Term of translocation?
Movement of assimilates (e.g surcrose) to where they are needed in a plant (sink).
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Term and example of a source?
Source is where assimilates are produced. Example - leaves.
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Term and example of a sink?
Sink is where assimilates are used up. Example - a bud
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What are enzymes used for in translocation?
Maintain a concentration gradient from source to sink, by changing the dissolved substances at the sink.
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What is the theory of translocation?
Mass Flow Hypothesis
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How does mass flow hypothesis work?
1. active transport load the assimilates into the sieve tubes of the phloem at source - lowers the water potential inside sieve tubes. Water enters by osmosis from the xylem cells. High pressure inside of sieve tubes.
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Card 2

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Term and example of a source?

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Source is where assimilates are produced. Example - leaves.

Card 3

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Term and example of a sink?

Back

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Card 4

Front

What are enzymes used for in translocation?

Back

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Card 5

Front

What is the theory of translocation?

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