Related Experiment Video
Updated: Jun 19, 2026

Robotic Sensing and Stimuli Provision for Guided Plant Growth
Published on: July 1, 2019
THE ACTION OF THE PLANT GROWTH HORMONE
1William G. Kerckhoff Laboratories of the Biological Sciences, California Institute of Technology, Pasadena.
Abstract:
1. Sections of Avena coleoptiles are found to show a considerable elongation when suspended in solutions of growth substance. 2. This elongation does not take place in the absence of O(2) and is inhibited by KCN and phenylurethane. 3. The rate of respiration of sections of coleoptiles is increased by the addition of growth substance in concentrations which cause growth. High concentrations of growth substance inhibit growth and also respiration. 4. The increase in respiration is inhibited by KCN and phenylurethane in the concentrations which inhibit normal respiration. These concentrations are the same as those which inhibit growth. 5. From 2, 3, and 4, it seems possible that the increase in respiration caused by growth substance may be an essential part of its action in growth.
Related Concept Videos
Plant Hormones
Plant Hormones
Cell Signaling in Plants
Morphogenesis
Responses to Gravity and Touch
Meristems and Plant Growth
