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Transcript 
Plant Tissues: Overview
Many of the figures found in this presentation are from the internet site
http://botit.botany.wisc.edu/images/130/ and a CD entitled “Plant Anatomy” by
Richard Crang & Andrey Vassilyev published by McGraw Hill.
Meristematic tissues – localized
regions of cell division

Apical Meristems


Primary or Transitional Meristem  Primary growth
Lateral Meristems

Vascular cambium  secondary vascular tissues
Cell Division: Mitosis (nuclear division) +
Cytokinesis (cytoplasmic division)
1. Interphase
2. Prophase
3. Metaphase
4. Anaphase
5. Telophase
6. Cytokinesis
Illustration from: http://biology.nebrwesleyan.edu/benham/mitosis/
Shoot Apical Meristem
Root Apical Meristem
1. Root cap
initials
2. Protoderm
3. Ground
meristem
4. Procambium
5. Root cap
Lateral Meristems – secondary
growth in woody plants
Basswood – root in cross section
Basswood – stem in cross
section; 1, 2, 3 year old stems
Simple Tissues – consisting of one
cell type

Parenchyma – thin walled & alive at maturity; often
multifaceted.


Collenchyma – thick walled & alive at maturity
Sclerenchyma – thick walled and dead at maturity



Sclerids or stone cells – cells as long as they are wide
Fibers – cells longer than they are wide
Epidermis – alive at maturity


Trichomes – “pubescence” or hairs on epidermis
Root Hairs – tubular extensions of epidermal cells
Parenchyma
Collenchyma
Sclerenchyma
SCLERIDS
Right-hand illustration modified from: Weier,
Stocking & Barbour, 1974, Botany: An
Introduction to Plant Biology, 5th Ed.
FIBERS
Epidermis – stoma, trichomes, & root hairs
http://www.ucd.ie/botany/Steer/hair/roothairs.html
Complex Tissue




Xylem – water conducting tissue; parenchyma, fibers,
vessels and/or tracheids, and ray cells.
Phloem food conducting tissue; sieve-tube members
(no nucleus at maturity, cytoplasm present),
companion cells, fibers, parenchyma, and ray
cells. In flowering plants, sieve-tube members and
companion cells arise from the same mother cell.
Periderm – protective covering; composed of cork
and parenchyma.
.
Xylem
Phloem
Vascular Bundles with xylem & phloem
Maize or Corn – vein in cross
section
Alfalfa – vein in cross section
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