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Question
How phosphorylase enzyme open the stomata in starch sugar interconversion theory?
Solution
- The discovery of enzyme phosphorylase in guard cells by Hanes (1940) greatly supports the starch-sugar interconversion theory.
- The enzyme phosphorylase hydrolyses starch into sugar and high PH followed and the opening takes place during the night.
- Day:
- \[\ce{Starch ->[phosphorylase] sugar}\]
- Photosynthesis occur
- pH – increased
- Movement of water from
- subsidiary cells to guard cells
- Guard cells become turgid
- Opening of stomata
- Night:
- \[\ce{Sugar ->[phosphorylase] starch}\]
- No Photosynthesis
- pH – lowered
- Movement of water from guard cells
- Guard cells become flaccid
- Closure of stomata
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