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Complementary chromatic adaptation: photoperception to gene regulation

D M Kehoe¹, A R Grossman

¹Department of Plant Biology, Carnegie Institution of Washington, Stanford, CA 94305.

Seminars in Cell Biology

|October 1, 1994

Summary

Cyanobacteria adapt to light color by altering their light-harvesting antenna complexes (phycobilisomes). This complementary chromatic adaptation involves synthesizing different pigments like phycocyanin in red light and phycoerythrin in green light.

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Area of Science:

Photosynthesis
Microbiology
Biochemistry

Background:

Photosynthetic organisms exhibit light acclimation.
Cyanobacteria regulate light-harvesting antenna complex (phycobilisome) synthesis based on light quality.
Complementary chromatic adaptation is a key response in certain cyanobacteria.

Purpose of the Study:

To review the mechanisms of complementary chromatic adaptation in cyanobacteria.
To discuss how light sensing and regulatory elements control phycobilisome composition.

Main Methods:

Comparative analysis of cyanobacteria grown under different light conditions (green vs. red light).
Examination of phycobilisome composition (phycocyanin and phycoerythrin content).
Review of regulatory pathways involved in light acclimation.

Main Results:

Red light induces synthesis of phycocyanin, resulting in blue-green cells.
Green light induces synthesis of phycoerythrin, resulting in red cells.
Associated linker polypeptides are crucial for phycobilisome assembly and structure.

Conclusions:

Cyanobacteria possess sophisticated mechanisms to sense and respond to environmental light quality.
Complementary chromatic adaptation is a regulated process involving specific pigment and polypeptide synthesis.
Understanding these adaptations provides insights into microbial survival strategies.