Page 202 - PG 101-Course notes مذكرة النظري 24-25 with spec

Medicinal plants (PG 101) Level 1 Clinical Pharmacy-PharmD

responses to light, gravity

- Inhibits lateral bud sprouting = apical dominance.

- IAA (Indole Acetic Acid) = important naturally occurring

auxin; applied to fruit trees to promote flowering, set fruit, and

encourage synchronous development of fruit.
2. Gibberelins - Also promote cell elongation; prod buds and seeds into breaking

dormancy and resuming growth in spring; stimulate breakdown

of starch (may influence flowering in some species).

3. Cytokinins - Stimulate cell division in root meristems where they are

abundant.

- Correct balance w/ auxin promotes sprouting of buds.

- Promote leaf expansion; retard leaf aging (used commercially

to prolong life of stored vegetables and cut flowers).

4. Abscisic - Inhibits cell growth; helps prevent water loss by promoting

acid stomatal closure; promotes seed, bud dormancy.

- Applied to nursery stock prior to shipping to maintain

dormancy and thus resist damage.

5. Ethylene - Stimulates ripening of fruit (used commercially for this

purpose).

- Promotes "abscission" of leaves, fruit, flowers causing them

to drop from plants at appropriate times of year.

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