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when autumn turns the leaves brown, which leaf will fall first?
leaf on which part of the tree?
LEAF ABSCISSION: How Leaves Fall.
Senescence covers the period of time from when a leaf is functioning normally to when it falls from the plant (abscission). The process of leaf abscission begins at the base of the leaf petiole, the stalk attaching the leave to a stem. A barrier begins to form at the point of attachment. On the leaf side tissues grow softer, while on the stem side they harden and fill with corky, wax-like compounds. The flow of water and nutrients, once a two-way affair, both into and out of the leaf, becomes increasingly one way, out of the leaf. By the time the plant has withdrawn all that it can from a leaf the corky barrier between the leaf and the stem will be complete. On the leaf side the tissues will have softened and broken leaving the leaf attached to the plant by its vascular bundles: the series of tubes through which water and sap flow into and out of leaves, the leaf "veins". With the action of wind and frost these soon break and the leaf falls to the ground. But what falls is merely a hollowed out shell. Where the leave was attached to the stem is now an impermeable leaf scar, which will be incorporated into the stem bark. Often right next to the leaf scar on the stem are the buds that will produce new shoots and leaves in the following spring.
I hope that helps you
Autumn Brown