Practice question

Gibberellin promotes germination by breaking seed dormancy and inducing hydrolytic enzymes mobilizing storage reserves toward growing embryo. Gibberellin-induced germination is particularly prominent in monocots especially cereals where embryo-synthesized GA diffuses to aleurone layer activating α-amylase gene expression via GAMYB Myb transcription factor degrading starchy endosperm releasing soluble sugars feeding embryo growth. This aleurone response is relatively minor in dicots where reserves reside in cotyledons. Malting in barley and brewing industries exploit GA-induced aleurone α-amylase production demonstrating agronomic importance and hormonal regulation of post-germinative reserve mobilization during seedling establishment phase.