Transcript Document

Lab #8 Angiosperms
Plastids
Amyloplasts – from garden bean
chromoplasts – from red pepper
Epidermal structures
Trichome and leaf cross section
Guards cells + Stoma
Mesophyll – Palisade and Spongy
epidermis
palisade
spongy
epidermis
Monocot Root
xylem
(vessel
element
& tracheids)
pith
phloem
pericycle
http://www2.mcdaniel.edu/Biology/botf99/rootuse/monovsdi.htm
pith
Monocot root
endodermis
xylem
(vessel
element
& tracheids)
pith
phloem
pericycle
Monocot stems
epidermis
parenchyma
Monocot Stem Vascular Bundle
xylem
sclerenchyma is called a bundle sheath in
monocot leaf vascular bundles
Monocot Leaf
Dicot Root
vascular cylinder = stele
pericycle
phloem
metaxylem
from Biology 311 site Alison Roberts ([email protected])
© 1998-2012 AWR
endodermis
Dicot Lateral Root
epidermis
Dicot stems
cortex
phloem
vascular
cambium
pith
Helianthus (sunflower)
metaxylem
protoxylem
from Biology 311 site Alison Roberts ([email protected])
© 1998-2012 AWR
Trifolium (clover)
sclerenchyma
Dicot Stem
fasicular
cambium
xylem
interfasicular
cambium
pith
phloem
Dicot Stem Vascular Bundle
sclerenchyma
tracheids
region of
metaxylem
region of
protoxylem
Dicot Leaf
Stained cross-section through the leaf of lilac: 1 upper epidermis, 2 palisade parenchyma, 3 spongy parenchyma, 4 air cavity, 5 lower epidermis, 6 stomata, 7 trichome, 8
major vein, 9 xylem, 10 phloem, 11 supporting tissue (sclerenchyma)
http://www.vcbio.science.ru.nl/en/virtuallessons/leaf/mesomorph/
Dicot Leaf
Dicot vs. Monocot Vascular Bundles
Sclerenchyma
Sclerenchyma
tracheid
DICOT
from Biology 311 site Alison Roberts ([email protected])
© 1998-2012 AWR
MONOCOT
Dicot vs. Monocot Root
Monocot vs. Dicot Stem
MONOCOT
DICOT
No vascular cambium – no secondary growth!
protoxylem
sclerenchyma
phloem
metaphloem
metaxylem
Tracheids
with circular-bordered pits
in their primary walls
WATER-CONDUCTING CELLS OF THE XYLEM
Pits
Tracheids
from Biology 311 site Alison Roberts ([email protected])
© 1998-2012 AWR
TRACHEIDS
VESSEL
ELEMENTS
perforation plates in the
side walls of a vessel element
tracheids
vessel elements
with perforation plates
Ash wood
perforation
plate
perforation plate: the
end wall of a vessel
element where the
secondary cell wall
was not deposited
and the primary cell
wall has been
digested.
vessel
element
xylem ray
tracheids
from Biology 311 site Alison Roberts ([email protected])
© 1998-2012 AWR
vessel
elements
tracheids
from Biology 311 site Alison Roberts ([email protected])
© 1998-2012 AWR
perforation
plates
pits
from Biology 311 site Alison Roberts ([email protected])
© 1998-2012 AWR
Tracheids with annular thickenings
from Biology 311 site Alison Roberts ([email protected])
© 1998-2012 AWR
3 yr Tilia stem (Basswood)
secondary
xylem
(tracheids &
vessel elements)
vascular
cambium
secondary
phloem
cork
cambium
cork
secondary
xylem
(tracheids &
vessel elements)
secondary
xylem
(tracheids &
vessel elements)
cork + cork cambium = periderm
vascular cambium to cork = Bark
Cork Cambium
lenticel
cork
cork cambium
from Biology 311 site Alison Roberts ([email protected])
© 1998-2012 AWR
Lenticel
from Biology 311 site Alison Roberts ([email protected])
© 1998-2012 AWR