Related Experiment Video
Updated: Aug 11, 2026

A Simple Chamber for Long-term Confocal Imaging of Root and Hypocotyl Development
Published on: May 17, 2017
Growth patterns and gravitropic curvature of radish hypocotyls
Abstract:
The rapid growth rate of radish cells makes the hypocotyl particularly valuable in research on growth phenomena and gravitropism. An examination of mean data regarding the growth of aetiolated radish seedlings not subjected to gravitropic stimulation showed that there was an increase in the growth rate from day 3 to day 5. When the hypocotyl was placed horizontally all zones showed an increase in growth of the lower surface of the hypocotyl and generally a decrease in the growth rate in the upper surface. The upper apical part of the gravistimulated hypocotyl grew almost the same as controls. In some cases, in both 4- and 5-day-old seedlings, in the upper median part there was a lower growth rate than in controls. The zones of growth during the development of the hypocotyl were different. Analysis of curvature showed that the growth rate of the different zones was a function of their location in the hypocotyl and that the rate of curvature was different in various parts of the hypocotyl.
Related Concept Videos
Introduction to Seed Plants
Meristems and Plant Growth
Primary and Secondary Growth in Roots and Shoots
Water and Mineral Acquisition
Seed Structure and Early Development of the Sporophyte
Responses to Gravity and Touch

