Discussion:

During cereal seed germination, active GAs induce de-novo synthesis of α-amylase RNA. The GAs stimulate the aleurone cells to transcribe the hydrolytic enzyme α-amylase, in the aleurone layer of the cereal seed.  The aleurone layer secretes α-amylase and other hydrolytic enzymes such as protease, ribonuclease, β-amylase, and α-1,3-glucanase. α-amylase plays an important role in hydrolysis of stored starch in the endosperm, converting it to simple sugars such as glucose, which provide the energy for development of shoots and roots. Many other enzymes that hydrolyse lipids and proteins are also produced in the aleurone layer. Sugars and amino acids are released into the scutellum, where they are absorbed by the embryo, providing nourishment for it to develop into a seedling. It is apparent that the growth regulating hormone Gibberellin is vital for the stimulation of seed germination, resulting in shoot and root emergence from the seed coat. 

Role of GAs in seed germination.