Steward's theory of stomatal opening and clos | vedclass

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(C) Steward's theory (also known as the Starch-Sugar Interconversion Theory) proposes that the opening and closing of stomata are regulated by the int

Vedclass · Accepted Answer

Phosphorylase,phosphoglucomutase,phosphatase,and hexokinase

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(C) Steward's theory (also known as the Starch-Sugar Interconversion Theory) proposes that the opening and closing of stomata are regulated by the interconversion of starch and soluble sugars in the guard cells.According to this theory,the process involves the following enzymatic steps:$1$. In light,the $pH$ of guard cells increases,which activates the enzyme $Phosphorylase$. This enzyme converts starch into glucose$-1-$phosphate.$2$. $Phosphoglucomutase$ then converts glucose$-1-$phosphate into glucose$-6-$phosphate.$3$. $Phosphatase$ converts glucose$-6-$phosphate into glucose,which increases the osmotic pressure,leading to water entry and stomatal opening.$4$. In darkness,the $pH$ decreases,and $Hexokinase$ (along with other enzymes) facilitates the conversion of glucose back into starch,leading to stomatal closure.Therefore,all these enzymes are considered essential components of the theory.

Steward's theory of stomatal opening and closure assumes the presence in the guard cells of which of the following enzymes?

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