Gibberellic Acid Controls the Secretion of Acid Phosphatase in Aleurone Layers and Isolated Aleurone Protoplasts of Avena fatua

The role of gibberellic acid (GA₃) in controlling the secretion(across the plasma membrane) and release (through the cell wall)of acid phosphatase (E.C. 3.1.3.2 EC] .) from Avena aleurone layershas been investigated. Evidence from this comparative studywith intact aleurone layers and isolated aleurone protoplastsreveals that the secretion of acid phosphatase is under GA₃control. The mechanism underlying secretion and release of theenzyme from aleurone cells is discussed. Key words: Avena fatua, Acid phosphatase, Aleurone protoplasts, Gibberellic acid, Secretion