The cereal seed’s nutrient handoff
During cereal grain germination, such as in corn or wheat, a coordinated handoff takes place between the starchy endosperm and the embryo to supply necessary nutrition [1][2].
The starchy endosperm acts as a storage tissue that surrounds the embryo and holds reserves primarily in the form of starch [3]. Rather than simply sitting beside the embryo as passive food, these reserves must be actively mobilized [4]. This is where specialized tissues come into play:
- Aleurone layer: This outer layer of endosperm cells remains alive and secretes hydrolytic enzymes, such as amylase, which digest the endosperm's stored starches into usable sugars [5][6].
- Scutellum: Acting as a nutrient transfer link between the embryo and the endosperm, the scutellum absorbs the newly released sugars and nutrients and passes them directly to the embryo [7].
This biochemical pipeline creates a dynamic transfer pathway rather than a simple static food source [8][9]. By converting complex stored reserves into accessible energy and nutrients, this mechanism directly supports early seedling growth [10].
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