EVERYDAY SCIENCE

Detailed explanation-1: -Potassium ions movement into and out of guard cells is related to the turgidity and consequent opening and closing of stomatal pore.

Detailed explanation-2: -To put it simply, potassium regulates the opening and closing of plant stomata. Stomates are the pores on plant leaves that allow for gas and water vapor exchange. When plants have adequate potassium, the guard cells swell and allow for complete closure of the stoma opening.

Detailed explanation-3: -K+ ions move out of the cell. This causes the stomatal pore to close. This occurs in the absence of light or when rates of photosynthesis are low. In this condition the stomatal pore is closed.

Detailed explanation-4: -An increase in potassium(K) ion makes the guard cells hypertonic so that more water can enter inside the cells. During this, the stomatal pore is opened. Closing is just an opposite phenomenon of opening as in closing the water is removed from the guard cells and they become flaccid.

Detailed explanation-5: -In a series of publications Fujino proposed that stomatal opening and clos-ing are due to the active transport of K ions into and out of guard cells (Fujino, 1967).