01:119:100 Lecture Notes - Lecture 22: Coleoptile, Auxin, Meristem
12 Jul 2015
School
Department
Course
Professor
Document Summary
Produced in one part of the body and transported long distances. 2: many kinds, each has a very specific effect. Effect in the body close to where they were produced. Few types regulating almost all aspects of plant"s life. 1: each can have many different effects. Directional growth response that is produced by an environmental. Directional: positive: grows towards stimulus, negative: grows away from the stimulus. 1. yelllow pigment: photoreceptors, absorb blue light, <500 nm. Six major classes of plant hormones, table 38-1. 1: 1st part of the grass seedling to emerge from the soil, when coleoptile is exposed to light from one direction, the plant will bend towards the light. 2. shielded/removed coleoptile at tip, bend did not occur shielded below tip, bend did occur concluded that something from the supper part influences the. 1920"s-- discovered that auxin is responsible for the phototrophic effect. Iaa--indolacetic acid: most common and important natural acid, main site of production: shoot apical meristem.
