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Chapter 6 Leaves (Morphology and Anatomy of Other Leaves (Kranz Anatomy…
Chapter 6 Leaves
Morphology and Anatomy of Other Leaves
Succulent
Thick & low surface area
Sclerophyllous Foliage Leaves
Hard relatively impenatrable
Conifers
Sclerous and unpalatable
Bud scales
Protect apical meristems from the cold and predators
Spines
Extreme sclerotic leaves
Protection over function
Tendrils
Grow forever
Can sense water and other surfaces
Kranz Anatomy
No palisade or spongy mesophyll
Vasculature surrounded by mesophyll cells for gas exchange
Bundle sheaths
Insect Traps
Digests insects
Other Leaf Types
C4 Kranz Anatomy
Insect Traps
Tendrils
Spines
Scales
Succulent
Sclerenchymatous
External Structure of Foliage Leaves
Purpose
Photosynthesis, Water Retention, and Pathogen Defense
Try not to be so nutritious that they are liability
Lamina
Flat and thin for photosynthesis
Dorsal side
Gas exchange/Vascular Tissue
Petiole
#
Reduces inter-plant shading
Many monocots don't have petioles
Sessile leaves lack petioles
Margins
The edge of the leaf
Internal Structure of Foliage Leaves
Vascular Tissue
Mid-vein
Can be enveloped by a bundle sheath
Lateral Veins
#
Can be enveloped by a bundle sheath
Mesophyll
Palisade Parenchyma
Photosynthesis
Spongy mesophyll
Loosely packed aerenchyma
Bottom
Top
Epidermis
Falls victim to transpiration
Loss of water due to high surface area
Needs to be relatively waterproof
Petiole
Transition between stem and lamina
Stipules protect the apical meristem
Initiation and Development of Leaves
Basal Angiosperms
Form a leaf primordium
Anterior to the meristem
Monocots
Grows a cylindrical primordium around the meristem
Vascular metastasis due to constant growth
Eudicots
#
Leaf primordium
Anterior to the meristem
Cool Facts
Onions are made of fleshy leaves
Makes life easier
Fiber Wrapped
Very Similar
