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Action Spectra for Chromatic Adaptation in Tolypothrix tenuis
Stephen Diakoff and Joseph Scheibe
Vol. 51, No. 2 (Feb., 1973), pp. 382-385
Published by: American Society of Plant Biologists (ASPB)
Stable URL: http://www.jstor.org/stable/4263128
Page Count: 4
You can always find the topics here!Topics: Pigments, Wavelengths, Algae, Irradiation, Absorption spectra, Irradiance, Incubation, Plant cells, Phycobilins, Plants
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The dark synthesis of biliproteins in the blue-green alga Tolypothrix tenuis is controlled by brief light treatments. Green light potentiates synthesis of phycoerythrin and red light potentiates synthesis of phycocyanin. Red reverses the effect of green and vice versa. Action spectra for the red and green effects were obtained for the wavelength region 320 nanometers to 710 nanometers, at 10-nanometer intervals. The principal action band in the red peaks at 660 nanometers, with a half-band width of 58 nanometers and an accompanying shortwave band at 360 nanometers. The green action band peaks at 550 nanometers, with a half-band width of 76 nanometers, and a shortwave band at 350 nanometers. Chromatic adaptation and another photomorphogenic response in the blue-green algae are discussed in terms of possible regulation by a photoreversible pigment recently isolated from Tolypothrix.
Plant Physiology © 1973 American Society of Plant Biologists (ASPB)