Home > Iowa Academy of Science > Journals & Newsletters > Proceedings of the Iowa Academy of Science > Volume 77 (1970) > Annual Issue
Document Type
Research
Abstract
A procedure for the study of the negative geotropic response in the Coleus stem and Avena coleoptile is presented. Time-lapse photography, employing a motordriven 35mm camera and specially designed chambers, is utilized in recording plant responses. Data from 3" x 7" photographic prints are recorded on computer punch cards, a line of best fit is determined and the rate of geotropic curvature at forty-five degrees calculated. This unique technique of reporting curvature rates emphasizes the dynamic character of the geotropic response and eliminates variation involved in the plant's perceptive mechanism.
Publication Date
1970
Journal Title
Proceedings of the Iowa Academy of Science
Volume
77
Issue
1
First Page
38
Last Page
46
Copyright
©1970 Iowa Academy of Science, Inc.
Language
en
File Format
application/pdf
Recommended Citation
Granger, Charles R.
(1970)
"A Method for the Dynamic Evaluation of the Geotropic Response,"
Proceedings of the Iowa Academy of Science, 77(1), 38-46.
Available at:
https://scholarworks.uni.edu/pias/vol77/iss1/9