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CH.6 Leaves (Morphology and Anatomy of Other Leaf Types (Leaves of…
CH.6 Leaves
Morphology and Anatomy of Other Leaf Types
Succulent Leaves
mesophyll has few air spaces
photosynthesis happens deeper
Bud Scales
protective against wind damage
tougher and waxier
Spines
needle shaped
no mesophyll parenchyma or vascular tissue
Sclerophyllous Foliage Leaves
soft, flexible, edible
produce more sugars
Leaves of Conifers
thick cuticle and epidermus walls
new phloem but no new xylem
evergreens
Tendrils
capable of sensing contact with object
side facing object stops growing
Leaves with Kranz Anatomy
C4 photosynthesis
no palisade or spongy mesophyll
Insect Traps
helps make amino acids and nucleotides
similar to foliage leaves
External Structure of Foliage Leaves
leaf blade (lamina)
dorsal surface (abaxial side)
lower side
larger veins
ventral surface (adaxial)
upper side
smooth
flat, light-harvesting portion
simple leaf
blade of just one part
compound leaf
leaflets
many small blades
petiolule
attachment of leaflets
rachis
extension of the petiole
petiole
holds blade out to the light
stalk
petiolate
leaf has petiole
abscission zone
cutting off leaf after death
leaf scar
sessile leaf
has no petiole
Sheathing leaf base
leaf wraps around base of stem
veins
bundles of vascular tissues
distribute water from stem to leaf
collect sugars and carry to stem
reticulate venation
eudicots and basal angiosperms
Internal Structure of Foliage Leaves
Epidermus
transpiration
water loss
lower epidermus
more stomata
upper epidermus
less stomata
Vascular Tissues
midrib/midvein
eudicot
lateral veins
minor veins
water from xylem and sugar to phloem
conduction/support/protection
bundle sheath
bundle sheath extension
Mesophyll
ground tissues
palisade parenchyma
made of
upper surface
organized, tight
spongy mesophyll
made of
lower surface
loose, free
Petiole
more information
leaf traces
branch from vascular bundles
stipules
protect shoot apical meristem
Initiation and Development of Leaves
Basal Angiosperms
Eudicots
leaf primordium
grows quickly
taller that apical meristem
bulk of midvein
Monocots
primordium grows with apical meristem
Concept
shoot system
stem
elevate leaves
leaves
chlorophyll-rich chlorenchyma
phoyosynthesis
only primary tissue (usually)
foliage leaves
all about the structure
focus of chapter
