BIOL-1507EL Lecture Notes - Lecture 1: Corn Kernel, Cotyledon, Seed
21 Dec 2019
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Bean seed as an example on dicots seed: if the two halves of bean seed are parted you can see overdumenbry plant and is called plumule. Corn kernel as an example on monocots seeds: corn kernel is actually fruit, and the outer covering is the pericarp. The epicotyle is the portion of the stem above the attachment of the cotyledon and the hypocotyle is the portion of stem below the attachment of the cotyledon. The radical is the part of the embryo that contains the root apical cell and becomes the first (primary) root. The first step in germination of many seeds is imbibition, the absorption of water by the dry seed. The first organ to emerge from the germirtating seed in the radical (embryonic root) Next the shoot tip must break through the soil surface. In many dictos a hook forms in the hypocotyle and growths pushes the hook above the ground.
