Phytochrome Characterization by Rabbit Antiserum against High Molecular Weight Phytochrome
1Department of Biology, Vanderbilt University, Nashville, Tennessee 37235.
Plant Physiology
|February 1, 1975
Summary
This study characterizes phytochrome from various plants using specific antibodies. Results show size variations in oat phytochrome and conserved antigenicity across different grass species.
Area of Science:
- Plant biology
- Biochemistry
- Immunology
Background:
- Phytochrome is a crucial plant photoreceptor regulating growth and development.
- Understanding phytochrome structure and antigenicity is key to deciphering its function.
- Variations in phytochrome size and form may impact its biological activity.
Purpose of the Study:
- To characterize phytochrome from different plant species using immunological methods.
- To investigate potential size differences and antigenic similarities of phytochrome.
- To explore the structural susceptibility of phytochrome to enzymatic degradation.
Main Methods:
- Purification of phytochrome from oat, rye, barley, and pea seedlings.
- Double diffusion assays using specific antisera against oat phytochrome.
- Micro-complement fixation assays to quantify antigenic activity.
- Immunoelectrophoretic analysis following proteolysis.
Main Results:
- Partial antigenic identity between large and small Garry oat phytochrome was observed.
- Large Garry oat phytochrome exhibited higher activity in micro-complement fixation assays compared to small phytochrome.
- Phytochromes from different grass species (oat, rye, barley) were antigenically identical.
- Proteolysis studies suggested specific regions of susceptibility in oat and rye phytochrome.
Conclusions:
- Phytochrome exists in different sizes, with variations affecting antigenic activity.
- Grass phytochromes share significant antigenic identity.
- Specific molecular regions of phytochrome are prone to enzymatic cleavage, offering insights into its structure.
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