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Chapter 6: Leaves (Morphology and Anatomy of Other Leaf Types…
Chapter 6: Leaves
Morphology and Anatomy of Other Leaf Types
Succulent Leaves
characteristic of species
Crassulaceae
Portulacaceae
Aizoaceae
adaptive
delicate leaves
Sclerophyllous Foliage Leaves
produce sugars
soft
flexible
edible
type of species
barberry
holly
agave
yucca
Leaves of Conifers
conifers
simple
sclerophylls
thick cuticle
perennial
Bud Scales
protections
not photosynthesis
small
rarely compound
Spines
cacti
microscopic green leaves
clusters
Tendrils
peas
cucumbers
squash
Leaves with Kranz Anatomy
C4 photosynthesis
lack palisade parenchyma and spongy mesophyll
Insect Traps
digest insects
plant obtain nitrogen
External Structure of Foliage Leaves
leaf blade
called lamina
dorsa surface
abaxial
vein
vascular bundles
ventral surface
adaxial
sheathing leaf base
no petiolate
flexible
petiole(stalk)
holds blade in light
allow for air flow
sessile leaf
instead petiolate
small
very long
narrow
sheathing leaf base
leaf base wraps around the stem
flex
flutter
simple leaf
just one part of blade
compound leaf
blade divided into several part
rachis
petiolule
extension of petiole
Internal Structure of Foliage Leaves
Epidermis
transpiration
water loss
skin
protection
Mesophyll
palisade parenchyma
called palisade mesophyll
main photosynthetic tissue
upper surface
spongy mesophyll
lower portion of the leaf
loose aerenchyma
permits CO2 diffusion
ground tissue interior
Vascular Tissue
midrib
midvein
large eudicot leaf
lateral veins
minor veins
bundle sheath
fibers arranged sheath
bundle sheath extension
large veins
have a mass of fibers above, below or both
Petiole
leaf traces
more vascular bundles
transition between stem and lamina
part of leaf
massive in stalky plants
stipules
Concepts
foliage leaves
large
flat
green
involved in photosynthesis
provide protection
bud scales
spines
support tendrils
storage(fleshy leaves of bulbs)
all different kinds and purpose for leaves
leaves are part of the shoot system
stems
Initiation and Development of Leaves
Basal Angiosperms and Eudicots
leaf primordium
fetus
protoderm
leaves produced through shoot apical meristem
development
Monocots
eudicots
initiated expansion of shoot apical meristem cells from leaf primordium
protected
regenerations
