Question

For photoactive opening of stomata, the proton transport concept was given by

• A. Levitt
• B. Milborrow
• C. Ziegler
• D. None of the above

Answer 1

The correct option is A Levitt

Proton transport concept in stomata was given by Levitt and is most widely accepted theory.
According to this theory, protons formed due to malic acid dissociation in guard cells are transported to subsidiary cells and in exchange potassium ions move into guard cells. This ion exchange requires ATP. The potassium ions are osmotically active. Their influx into the guard cells increases osmotic pressure of guard cells and results in endosmosis, which opens the stomata.