How the change in pH occurs in guard cells wa | vedclass

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(A) The starch-sugar interconversion theory was proposed by $J.D. Sayre$ in $1926$. He observed that the $pH$ of guard cells increases during the day

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Sayre

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(A) The starch-sugar interconversion theory was proposed by $J.D. Sayre$ in $1926$. He observed that the $pH$ of guard cells increases during the day (due to photosynthesis consuming $CO_2$),which activates the enzyme phosphorylase to convert starch into sugar. This increase in sugar concentration lowers the water potential of the guard cells,causing water to enter via osmosis,leading to stomatal opening. Conversely,at night,the $pH$ decreases,causing the conversion of sugar back into starch,leading to stomatal closure.

How the change in $pH$ occurs in guard cells was explained and the theory of starch $\rightleftharpoons$ sugar interconversion was proposed by:

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