The cell wall is formed after the free endosperm nuclear is formed.The outmost layer of endosperm cell differentiates into the aleurone layer, while the other cells are filled with starch grains.

• 待大量游离核形成之后才形成细胞壁，紧贴胚囊的一层胚乳细胞最后形成种子的糊粉层，其余的胚乳细胞最后充满淀粉粒。