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Lab 7 Kingdom Plantae Primary and Secondary Growth

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Associate Professor Pamela L. Pannozzo. How Do Plants Grow? ... Apical meristem =at root base or shoot tip, causes root/stem length-wise growth. Coleus stem l.s. ... – PowerPoint PPT presentation

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Title: Lab 7 Kingdom Plantae Primary and Secondary Growth


1
Lab 7 Kingdom PlantaePrimary and Secondary
Growth
  • Principles of Biology II Laboratory
  • BSC 1011L
  • Associate Professor Pamela L. Pannozzo

2
How Do Plants Grow?
  • Primary growth length-wise growth, from
    meristems
  • Secondary growth width-wise growth, from
    cambium
  • Gymnosperms and Dicots only, not Monocots

3
Primary Growth Tissues
  • Protoderm epidermis
  • Procambium vascular columns
  • Ground meristem fills in, pith, cortex
  • Meristem area of rapidly dividing meristematic
    cells, undifferentiated
  • Apical meristem at root base or shoot tip,
    causes root/stem length-wise growth

4
Coleus stem l.s.
protoderm
5
(No Transcript)
6
Monocot root l.s.--Zea
7
(No Transcript)
8
Secondary Growth Tissues
  • Lateral meristems between xylem and phloem,
    causes root/stem width-wise growth
  • Periderm bark, replaces epidermis
  • Vascular Cambium between secondary xylem and
    secondary phloem causes root to grow in diameter
  • Cork Cambium between cortex and periderm

9
Periderm
10
(No Transcript)
11
Basswood stem c.s.
12
(No Transcript)
13
Types of Wood
  • Hardwood angiosperm dicots, tracheids and
    vessel elements
  • Softwood gymnosperms, mostly tracheids, no
    vessel elements
  • Heartwood xylem blocked with resins,
    non-functioning
  • Sapwood xylem functioning
  • Monocot wood not really wood--fibers

14
Types of Wood
  • Hardwood

15
Types of Wood
  • Softwood

16
Hard wood (oak)
Soft wood (pine)
17
Types of Wood
  • Heartwood
  • Sapwood
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