胚的发生和发育(荠菜) Embryogenesis and development of Embryo 胚的分化与成 熟 differentiation and maturation ●球形胚 心形期 ●鱼雷形期 ●成熟期 D B E
胚的发生和发育（荠菜） Embryogenesis and development of Embryo z 胚的分化与成 熟 differentiation differentiation and maturation and maturation z 球形胚 z 心形期 z 鱼雷形期 z 成熟期
Embryo sac perm otoderm Endosperm Two-celled proembryo Suspensor with large basal cell ge basal ce (a) (b)
E ev e BC 合子分裂形成二细胞原胚 b 八细胞原胚
八细胞原胚 合子分裂形成二细胞原胚
421球形胚
球形胚
