01:119:116 Lecture Notes - Lecture 11: Alpha-Amylase, Agent Orange, Meristem

• School: Rutgers University
• Department: Biological Science
• Course: 01:119:116
• Professor: Heather Lewis

Document Summary

L11 plant hormonal control (classic: intro, plant hormones, organic compound- chemical messengers, control specific physiological responses, aka plant growth regulators, general characteristics, active at very low concentrations, each can have multiple effects c. Interact with each other: natural & synthetic, tropisms, directional growth response produced by environmental stimulus, directional, positive- toward stimulus, negative- away from stimulus, ex. Phototrophism: 8 major classes of plant hormones. Auxins: 1st plant hormone to be discovered by darwin & son, darwins" experiments. Iaa- indoleacetic acid: most common & physiologically important natural auxin, main site of production- shoot of apical meristem, transport- polar (=unidirectional) down shoot-root axis, active. Selective herbicides- kill plants w/ broad leaves, but not grass: similar to iaa disrupt normal growth, 2,4,5-7: not allowed in us b/c dioxins, agent orange- mixture, fruit development- developing seeds- produce auxins promote development i. ex. 3: cytokinins produced in roots, cut a stem off a plant leaves lose source of cytokinin die.