Biology – 6.1 Plant nutrition – photosynthesis | e-Consult
6.1 Plant nutrition – photosynthesis (1 questions)
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Plants convert glucose into starch through a process called starch synthesis. This involves the enzymatic polymerization of glucose molecules into long chains of glucose units, forming amylose and amylopectin – the two main components of starch.
The key enzymes involved in starch synthesis are:
- Starch Synthase: This enzyme catalyzes the formation of α-1,4-glycosidic bonds between glucose molecules in amylose.
- Amylo-α(1,6)-transglycosylase: This enzyme creates α-1,6-glycosidic bonds, forming branches in amylopectin.
Efficient starch synthesis requires specific conditions:
- Presence of Starch Synthase and Amylo-α(1,6)-transglycosylase: These enzymes must be present in the plant cells.
- Energy (ATP): The polymerization process requires energy, which is supplied by ATP.
- Glucose Availability: A sufficient supply of glucose is necessary as the substrate for the enzymes.
- Suitable pH: The enzymes function optimally within a specific pH range, typically slightly acidic to neutral.