On the photoreceptor pigment for phototropism and phototaxis

is a carotenoid the most likely candidate?

P. S. Song, Thomas A Moore

Research output: Contribution to journalArticle

62 Citations (Scopus)

Abstract

The absorption spectrum of lycopene can be altered to show significant absorption in the 350-360 nm region in an ethanol water mixture, thus resembling the phototropic action spectrum of Avena coleoptiles. The hypochromicity (bleaching) of the main absorption band and appearance of the new band at 350-360 nm can be attributed to exciton interactions between two stacked lycopene molecules. β Carotene does not show anomalous bleaching under identical conditions. Thus, the apparent modification of the absorption spectra of carotenoids in ethanol water mixtures cannot be used as an argument to resolve the action spectrum in terms of carotenoids. In addition, the authors critically reviewed the spectroscopic characteristics of carotenoids. Short lifetimes of the excited singlet states and inefficient intersystem crossing of carotenoids are not compatible with the suggestion that carotenoids are the most likely candidate for the photoreceptor pigment in phototropism.

Original languageEnglish
Pages (from-to)435-441
Number of pages7
JournalPhotochemistry and Photobiology
Volume19
Issue number6
Publication statusPublished - 1974

Fingerprint

phototropism
Phototropism
photoreceptors
carotenoids
Carotenoids
pigments
Pigments
Absorption spectra
bleaching
absorption spectra
Bleaching
ethyl alcohol
Ethanol
carotene
Water
Cotyledon
water
suggestion
Excited states
excitons

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Biochemistry
  • Biophysics

Cite this

On the photoreceptor pigment for phototropism and phototaxis : is a carotenoid the most likely candidate? / Song, P. S.; Moore, Thomas A.

In: Photochemistry and Photobiology, Vol. 19, No. 6, 1974, p. 435-441.

Research output: Contribution to journalArticle

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