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Chapter 11: Plant Growth & Development, Hard outer coating, Axis…
Chapter 11: Plant Growth & Development
Mature Seed
Seed coat
Food Reserves
Endosperm
Cotyledon(s)
Embryo
Stages of Seed Development
Embryogenesis
Apical cell
Embryo proper
Basal Cell
Suspensor
Stages of Embryo Formation
Stage 1 (Proembryo Stage)
Going through mitosis
Called a proembryo
Establishes polarity
Stage 2 (Globular Stage)
Called globular stage
develops into three ringed tissue systems (radial pattern)
Primary Tissues
Protoderm (dermal tissue)
Ground Meristem (ground tissue)
Procambium (vascular tissue)
Stage 3 (Heart Stage)
Cotyledons (seed leaf) emerges
All 3 primary meristems are present
Notch forms at base where future apical meristem of shoot is located
Suspensor is still present
Very metabolically active
Provides nutrients and growth regulators
Short lived and undergoes apoptosis before embryo matures
Stage 4 (Heart Stage)
Cotyledon(s) elongate
Suspensors no longer present
Embryo is near maturity
Clear apical-basal pattern
Seed Maturation
Apical basal pattern
Radial Pattern
Mature Embryo
Has axis (w/ one or two cotyledons
Epicotyl
Hypocotyl
Radicle
Apical Meristerms
Hard outer coating
Axis attached with cotyledon
Established a superimposed body plan
