Plant Growth

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Meristems

Generate new cells

Apical= length (primary growth)

Lateral= thickness (secondary)

  • Vascular Cambium (adds vasc tissue)
  • Cork Cambium (replace epidermis)

In woody plants both growth at same time.

Dividing Cells prod--> 

  • Initials (stay in meri)
  • Derivatives (form tiss)
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Primary Growth

  • Division
  • Elongation (10x)
  • Differen

Eudicots= Vascular bundles forming ring

Monocots= Scattered vasc bundles

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Secondary Growth

Stems and Roots

Rare in monocots

Vascular Cambium= inc flow and support to shoots.

Cork Cambium= prod tough cells, protects against H2O

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Morphogenesis

Development of body form and organization

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Embryogenesis

Single cell zygote into complex individual

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Phases of Development

  • Embryogenesis
  • Vegetative Development
  • Reproductive development
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Cell Fate

Not fixed but affected by position

Cells final position determines kind cell it becomes

Positional effects mediated by morphogenes (provide positional cues)

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Summary

  • Plant growth in meristems
  • Primary= length
  • Secondary= girth/strength
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