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Initiation and Development of Leaves - Coggle Diagram
Initiation and Development of Leaves
Basal Angiosperms and Eudicots
At the base of the shoot apical meristem, cells interior to the protoderm grow outward.
Forms a leaf primordium.
Leaf protoderm
Leaf ground meristems
A strand of cells in the center differentiates into
Provascular tissue
Then into primary xylem and phloem, forming a connection with the young bundles in the stem.
The young leaf consists of a midrib and two small, thin wings of lamina tissue.
All cells in the wings are meristematic.
Their division and expansion enlarge the lamina rapidly.
During lamina expansion:
Stomata, trichomes, and vascular bundles differentiate.
The petiole becomes distinct from the midrib.
When complete, the leaf is still very small, much less than one-tenth its mature size.
Full expansion, typically in spring, occurs as water enters and expands the cell.
In many perennial plants, leaves initiate in summer or autumn.
When the bud opens, the young leaves rapidly expand and mature.
They become dormant as part of a resting terminal or axillary bud until the growing season begins.