Related Experiment Video
Updated: May 3, 2026

Evaluation of Photosynthetic Behaviors by Simultaneous Measurements of Leaf Reflectance and Chlorophyll Fluorescence Analyses
Published on: August 9, 2019
Temperature dependence of phytochrome dark reactions
1Institute für Biologie II und III der Universität Freiburg, Schänzlestraße 9-11, D-7800, Freiburg i.Br., Federal Republic of Germany.
Abstract:
The dark reversion and the destruction reaction of the phytochrome of squash (Cucurbita pepo L.) cotyledons show different temperature behaviour in the temperature range 15-35°. The Arrhenius activation energy of the destruction reaction is temperature independent whereas that of the reversion reaction shows a jump at 20°. This indicates an interaction of phytochrome molecules with membranes. A reaction scheme is discussed which can explain the differences of the dark kinetics in a quantitative manner.
More Related Videos
14:13Atomic Force Microscopy of Red-Light Photoreceptors Using PeakForce Quantitative Nanomechanical Property Mapping
Published on: October 24, 2014
10:10Investigating Tissue- and Organ-specific Phytochrome Responses using FACS-assisted Cell-type Specific Expression Profiling in Arabidopsis thaliana
Published on: May 29, 2010
Related Concept Videos
Biological Clocks and Seasonal Responses
Photoreceptors and Plant Responses to Light
Responses to Heat and Cold Stress
Cell Signaling in Plants
Photosystems
Functioning of Photosystems
Photosystems contain many pigment molecules, such as chlorophylls and carotenoids, arranged in a particular organization across two domains — the antenna complex and the reaction center. The main aim of the pigment...
Photoreceptors and Visual Pathways