Bio 101 Plant Anatomy Ex 2 5 Postlab
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Bio 101 Plant Anatomy Ex 2 5 Postlab

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Bio 101 Plant Anatomy Ex 2 5 Postlab Bio 101 Plant Anatomy Ex 2 5 Postlab Presentation Transcript

  • Bio 101 Plant AnatomyEx. 2-5 Post lab discussion
  • Meristems
    Based on location
    Apical meristem
    Lateral Meristem
    Based on origin
    Primary meristems
    Secondary meristems
  • Root apex vs. Shoot apex
    Root apex –bidirectional (root cap and towards the axis)
    SUBTERMINAL
    No lateral appendages
    No nodes and internodes
    Branching initiated beyond
    the region of most active growth
  • Fundamental Tissues
    Parenchyma
    Collenchyma
    Sclerenchyma
  • Parenchyma
    P-walls only; except for parenchyma found in secondary xylem
    Living
    Intercellular spaces
  • Collenchyma
    Angular
    Lamellar
    Lacunar
  • Sclerenchyma
    Differentiate:
    Sclereids
    Fibers
    FIBERS:
    a. Xylaryfibers—
    1. libriform(absent in gymno) 2. fiber-tracheid
    b. Extraxylaryfibers– location?
  • Extra xylary fibers
    Monocot: bundle sheath
    Climbing dicots: cortical layer; pericyclic fibers
  • Sclereids
    brachysclereids– phloem, cortex and bark of stems
    ---flesh of fruits of pear
    Macrosclereids– testa of seeds of legumes
    Osteosclereids– seeds and leaves of dicots
    Astrosclereids--leaves
  • Parenchyma Origins
    Ground meristem
    Procambium
    Phellogen
    Vascular cambium
  • Collenchyma origins
    Ground meristem
    Procambium
  • Sclerenchyma origins
    Sclereid
    Parenchyma (sclerosis)—protoderm, procambium, or cambium, ground merisetm
    Fiber
    Procambium
    Cambium
    Ground meristem
  • Conducting Tissues
    XYLEM
    Vessels
    Tracheids
    Fibers (libriform and fiber-tracheid)
    Parenchyma– ray parenchyma and axial parenchyma
    PHLOEM
    Sieve tube or sieve cells
    Companion cells or albuminous cells
    Fibers (bast fibers)
    parenchyma
  • Vessel orTracheid?
    Imperforated
    Tapering ends
    Short and drum-like
    Arranged end to end
    Overlapping
  • Perforation (vessels)
    Simple
    Multiple
    Scalariform
    Reticulate
    foraminate
  • Secondary wall pattern
    Tracheids and vessel elements
    Protoxylem – annular or helical
    Metaxylem– scalariform; reticulate; pitted
  • Annular– helical– scalariform—reticulate--pitted
  • Phloem
    Sieve tube elements
    -- arranged end to end
    -- enucleate
    -- with specialized depressions at their end wall (sieve areas)
    ---sieve plates (end wall)
  • Sieve plate
    Simple
    Compound
  • Origins, Topography
    Vessel
    Tracheid
    Sieve tube
    Companion cell
    Sieve cell
  • Advantages
    Helical or annular tracheids?