BI111 Lecture Notes - Lecture 5: Axillary Bud, Adventitiousness, Daylily
Document Summary
In animals: substance produced in gland, circulates in blood, effects far away from site of production. In plants: acts at low concentrations to affect growth and development. Produced in one part of the plant and used in another part. Can have an effect on the cells that produce them, and after transport, on the tissues or target cells. High concentration of auxin at shoot tip. Adventitious root grow from stem tissue with synthetic auxin compared to without. Example for natural auxin indole-3-acetic acid (iaa) Some synthetic auxins, such as 2,4-d and 2,4,5-trichlorophenoxyacetic acid (2,4,5-t), are used as herbicides. Broad-leaf plants (dicots) like dandelions are much more susceptible to auxins than narrow-leaf plants (monocots) such as grasses and cereal crops. Delay leaf senescence, even reverse leaf senescence (ageing) Applied as kinetin, benzyladenine, or zeatin conjugates axillary bud growth in orchids, daylilies antioxidant (browning preventer) in cut salads. Mix with gas as fruit size stimulator.
