Automatic Monitoring of a Circadian Rhythm of Change in Light Transmittance in Ulva
Open Access
- 1 July 1976
- journal article
- research article
- Published by Oxford University Press (OUP) in Plant Physiology
- Vol. 58 (1) , 17-21
- https://doi.org/10.1104/pp.58.1.17
Abstract
Ulva lactuca L. var. latissima (L.) DeCandolle has a circadian rhythm of visible light transmittance change which is caused by chloroplast orientation. With a continuously recording microphotometer system, clear rhythms could be monitored for up to 10 days. Measuring beam intensity effects on the free running period were seen down to 10−7 w cm−2. While these effects complicate the measuring process, they demonstrate that Ulva is very sensitive to light. The free running period in constant darkness at 20 C is 24 to 25 hours. The position in the cell occupied by the chloroplasts when the rhythm damps out can be influenced by light. A method is described by which the times of rhythm maxima can be calculated accurately and objectively from a relatively small number of points.This publication has 1 reference indexed in Scilit:
- Circadian Rhythms of Chloroplast Orientation and Photosynthetic Capacity in UlvaPlant Physiology, 1976