Chapter 7: Leaves - Coggle Diagram
Chapter 7: Leaves
Morphology & Anatomy of Other Leaf Types
Succulent Leaves: thick & fleshy, and have a shape that reduces the surface-to-volume shape
Sclerophyllous Foilage Leaves: produce more sugars by photosynthesis than are used in their own construction & metabolism.
Leaves of Conifers: leaves are sclerophylls- they have a thick cuticle, epidermis and hypodermics have thick cell walls.
Bud Scales: small, specialized leaf, usually waxy or corky, that protects an unopened bud.
Spines: axillary buds, needle shaped mutations that inhibit lamina formation.
Leaves w/ Kranz Anatomy: plants that possess a mechanism off carbon dioxide transport that is special to the plant. It adapts C4 plants to arid environments
Insect Traps:ability to trap and digest insects
External Structure of Foilage Leaves
Leaf Blade: flat, light harvesting portion. Also called the Lamina
Dorsal Surface: the blade’s lower side
Abaxial side: the larger viens that protrude like backbones
Ventral surface: the upper side, also known as adaxial
Simple Leaf: has a blade of just one part
Compound Leaf: has a blade divided into several individual parts
Leaflets: a compound leaf that has many small blades
Petiolule:attaches leaflets are attached to it in compound leaf
Rachis: An extension of the petiole
Veins: bundles of vascular tissue
Parallel venation: larger veins that run side by side with few obvious interconnections
Petiole: the stalk that holds the blade out into the light
Petiolate: leaves that have a leaf stalk
Abscission zone: at the leaf base is an oriented perpendicular to the petiole
Sessile leaf: if leaves are small or very long and narrow, with no petiole
Sheathing leaf base: typically lack petiole, but leafy base wraps around stem
Reticulate venation: in basal angiosperms and eudicots, they occur in netted patterns.
Leaf scar: adjacent undamaged cells swell and become corky, causing the formation of protective scar tissue.
Internal structure of Foilage leaves
Transpiration: H2O lost through the epidermis
Mesophyll: the ground tissues interior to the leaf epidermis
Palisade parenchyma: the upper surface of most leaves is a layer of cells, which is the main photosynthetic tissue of most plants.
Spongy Mesophyll: the lover portion of the leaf: open, loose aerenachyma that permits CO2 to diffuse rapidly
Vascular Tissues: layer between palisade parenchyma and spongy mesophyll
Midrib: a eudicot leaf usually has one, also known as midvein
Lateral Veins: emerges from midrib
Minor Veins: branch off into narrower veins
Bundle Sheath: conducts and supports the leaf blade, many fivers are arranged as a sheath
Bundle Sheath Extension: veins that have mass of fibers above, below, or both.
Leaf traces: vascular tissues are the most variable; one, three, five, ot more cascular bundles
Stipules: the petiole bears two small flaps of tissue at it’s base
Leaf: large, flat, green structures involved in photosynthesis
Shoot system: Contains both stems and leaves
Stems: elevate leaves & condut material to and from them.
Initiation & Development of Leaves
Basal Angiosperms & Eudicots
Leaf primordium: cells just interior to the protoderm forming a protrusion
Monocots: initiated by the expansion of tome shoot apical meristem cells form a leaf primordium.