What is one of the main functions of the husk in the barley kernel?

The primary function of the husk in the barley kernel is its role as a filter bed during the mash separation process. The husk is composed of tough, fibrous material that remains intact during the mashing process. When the milled barley is mixed with water and heated, the husk creates a barrier that allows liquid wort to flow through while retaining the solid grain particles. This is crucial for efficient wort separation, as it helps to clarify the liquid and prevents grain particles from getting into the final product.

While the husk has other secondary functions, such as providing some protection for the embryo and contributing to the overall structure of the grain, its primary and most significant role in brewing is enhancing the brewing process through effective filtration during mash separation. The husk does not synthesize gibberellic acid nor does it store amino acids for fermentation, which are functions associated with different parts of the kernel or plant.