angiodevelop213-page1

angiodevelop213-page1 - Flowering Plants: Early Growth and...

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Flowering Plants: Early Growth and Development - 1 Following the double fertilization in the flowering plants, the zygote develops into the embryo, the endosperm nucleus into the endosperm tissue, the embryo sac wall and integuments of the ovule into the seed coat and the ovary and accessory tissue into the fruit. In this section we will discuss the development of the embryo, seed and fruit maturation, dispersal and germination. Embryo Development The first division of the zygote produces a small proembryo cell and a larger basal cell that develops the stalked suspensor, which elevates the developing proembryo into the endosperm tissue. Zygote (within the embryo sac) | First Division | || Upper cell Lower cell Proembryo Basal cell of the Suspensor Mass of cells Suspensor Stalk (surrounded by endosperm) Suspends embryo into endosperm | Proembryo, divided into 3 layers Protoderm ---> Surface Tissues Procambium ---> Vascular Tissues Ground Meristem ---> Ground Tissues | The embryo takes on the shape of an axis with meristems at both ends.
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