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(D) According to the proton transport theory (also known as the active $K^+$ transport theory),the opening and closing of stomata are regulated by the

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$K^+$

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(D) According to the proton transport theory (also known as the active $K^+$ transport theory),the opening and closing of stomata are regulated by the movement of potassium ions $(K^+)$.During the day,protons $(H^+)$ are pumped out of the guard cells,creating an electrochemical gradient.This gradient facilitates the active uptake of $K^+$ ions into the guard cells from the surrounding subsidiary cells.The accumulation of $K^+$ ions lowers the water potential inside the guard cells,causing water to enter via osmosis,which leads to the swelling of guard cells and the opening of the stomatal pore.

According to the proton transport theory,which ion plays an important role in the opening and closing of stomata?

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