Gibberellins mobilize nutrients during seed germination.

  1. Germination starts when a seed imbibes water.
  2. The embryo releases gibberellin (GA) to the aleurone (outer layer of the seed coat).
  3. The aleurone secretes α-amylase to hydrolyze sugars in the endosperm.
  4. Sugars absorbed from the endosperm by the scutellum (cotyledon) are consumed as the embryo grows.