Glycolate induces opening of stomata in (a) presence of oxygen (b) low CO 2 concentration (c) high CO 2 (d) CO 2 absent
Option B Zelitch (1963) suggested that glycolic acid is formed in the guard cells. This acid is formed under low concentration of CO 2 . Glycolate formed gives rise to carbohydrates. Under this condition, osmotically active material is produced and ATP synthesis also takes place. ATP is produced during glyoxylate glycolate shuttle. This ATP helps in the active pumping of water in the guard cells and stomata open. Stomata close when this process is reversed
