Which part of the barley kernel synthesizes gibberellic acid to initiate enzyme production?

The correct choice involves the scutellum, which plays a pivotal role in the germination process of barley. During this stage, the scutellum synthesizes gibberellic acid, a crucial hormone that signals the aleurone layer to start producing various enzymes necessary for converting stored starches and proteins into fermentable sugars and amino acids. This process is essential for the development of the seed and later influences the brewing process, as it affects the yield of fermentable sugars during mashing.

The aleurone layer, while indirectly involved in enzyme production, acts primarily as the location where gibberellic acid's action takes place, leading to the expression of enzymes like alpha-amylase. However, the initial synthesis of gibberellic acid occurs in the scutellum, making it the key player in triggering the germination metabolism that supports later brewing processes. Understanding the function of the scutellum in hormone production highlights its importance in the overall process of malting and brewing.