Which ion plays the most prominent role in the opening and closing of stomata?

Name: Which ion plays the most prominent role in the opening and closing of stomata?
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Question

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Potassium ions (K+) are crucial for the regulation of stomatal opening and closing in plants. They move in and out of the guard cells, causing changes in water potential that lead to the movement of water, which in turn results in the stomata opening or closing.

Which Ion Plays the Most Prominent Role in the Opening