Dr. Gilman – Module 2-1: Tree Anatomy and Biology

 

Continue Watching: Dr. Gilman – Module 2-2: Phases of growth

 

Topics covered in this video:

Tissues, Movement & Storage:

• Model of tree growth
• Bark
  – Outer bark – periderm
  – Inner bark – phloem
• Cambium
  – secondary meristem producing radial growth
  – forms the xylem & phloem
• Xylem (wood)
  – growth ring
  – vessel elements
  – fibers
  – axial parenchyma
  – rays
• Wood zones
• Sapwood
  – live and dead cells
  – conducting and non-conducting
• Protection wood
  – mostly dead cells
  – heartwood: age-altered
  – false heartwood, discolored wood, wetwood: event-altered e.g. root death, branch removal/death, lenticels
• Symplast – “the offense”
  – living portion of the tree
  – storage of starches, oils, proteins
• Apoplast – “the defense”
  – non-living portion of the tree
• Tyloses
  – close off vascular tissue to prevent further damage from drought or infection
  – forms the heartwood
• Bud trace
• Model of water and energy flow

Branch Union Attributes:

• Collar
• Vessel
• Pith
• Pith protection zone
• Branch protection zone – only forms with low aspect-ratio
  – fewer & narrower vessels
  – vessels are turned
  – more parenchyma
  – starch-rich zone
  – ratio of conducting to non-conducting cells is lower than normal wood
• Natural branch death

 

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This video is made available with permission from Dr. Ed Gilman. Illustrations, PowerPoints or photos by Edward F. Gilman, Professor, Environmental Horticulture Department, IFAS, University of Florida.

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– TreeMuggs

I would love to hear from you. Please send all comments/questions/hatemail to patrick@educatedclimber.com

 

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