Which part of the barley kernel enables nutrients to move between the starchy endosperm and the embryo?

The scutellum is a critical part of the barley kernel that plays an essential role in the transfer of nutrients from the starchy endosperm to the embryo during the germination process. It acts as a tissue that assists in the absorption of carbohydrates and proteins stored in the endosperm, which are necessary for the growth of the embryo as it develops into a plant.

During germination, enzymes produced by the aleurone layer break down the starches and other components in the endosperm, facilitating their accessibility to the scutellum. The scutellum then takes up these nutrients and provides them to the embryo, supporting its growth.

Understanding the function of the scutellum is crucial for comprehending how barley (and grains alike) develops from seed to plant, particularly in brewing, where starch conversion is a fundamental process. Focusing on the scutellum highlights its importance in nutrient mobilization, which is vital for the overall health and viability of the germinating seed.