Plant Body Page 1

I. Sex and Embryogenesis

• A.  Double Fertilization
• 1.  Egg + Sperm1 = Zygote (Diploid)
• 2.  Polar Nuclei + Sperm2 = Endosperm (Usually not Diploid)
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• B.  Establishment of Polarity of Plant Body
• 1. Suspensor pushes Developing Embryo into Endosperm
• 2. Root Apical Meristem forms
• 3. Shoot Apical Meristem and Cotyledons form
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• C. Differentiation of Primary Tissue Regions
• 1. Protoderm -> Epidermis
• 2. Ground Meristem -> Cortex & Pith
• 3. Procambium -> Primary Vascular Tissue
• 4. Suspensor cells are absorbed
• D. Endosperm is often absorbed by Cotyledons
• E. Mature Seed enters period of dormancy