title: Timing of the auxin response in etiolated pea stem sections.
abstract: The short term growth response of etiolated pea stem segments (Pisum sativum L., var. Alaska) was investigated with the use of a high resolution growth-recording device. The immediate effect of treatment with indole-3-acetic acid is an inhibition of growth. This inhibition lasts about 10 minutes, and then the rate of elongation rises abruptly to a new steady rate about 4 times the rate of elongation before auxin treatment. This rapid steady rate of elongation, however, continues for only about 25 minutes before declining suddenly to a lower steady rate of growth about 2 times the rate of elongation before the addition of auxin. Pretreatment of the segments with cycloheximide or actinomycin strongly inhibits both phases of auxin-promoted elongation without altering the length of the latent period in response to the hormone.
authors.affiliation: Department of Biology, Western Michigan University, and Department of Biology, Kalamazoo College, Kalamazoo, Michigan 49001.
authors.forename: G M
authors.initials: GM
authors.lastname: Barkley
authors.forename: M L
authors.initials: ML
authors.lastname: Evans