MULTIPLICATIVE ACTION OF A UV‐B PHOTORECEPTOR and PHYTOCHROME IN ANTHOCYANIN SYNTHESIS

Yatsuhashi, Hiroko; Hashimoto, Tohru

doi:10.1111/j.1751-1097.1985.tb03622.x

Cited by 20 publications

(13 citation statements)

References 14 publications

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“…Synthesis of anthocyanin and flavone glycoside appears to be mediated by UV-B and phytochrome photoreceptors (Wellmann, 1974;Drumm-Herrel and Mohr, 1981;Duell-Pfaffand Wellmann, 1982). Although both types of photoreceptor sometimes act synergistically, they may also act independent of one another (Yatsuhashi and Hashimoto, 1985). Takahama et al (1989) found a stimulation of flavonoid synthesis in Vicia faba by applying H20 2 • This suggests that H20 2 is involved in the oxidation offlavonols.…”

Section: Regulation Of Flavonoid and Isoflavonoid Productionmentioning

confidence: 97%

Effects of Ultraviolet-B Radiation on Terrestrial Plants

Bornman

Teramura

1993

Environmental UV Photobiology

187

138

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Section: Regulation Of Flavonoid and Isoflavonoid Productionmentioning

confidence: 97%

Effects of Ultraviolet-B Radiation on Terrestrial Plants

Bornman

Teramura

1993

Environmental UV Photobiology

187

138

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“…Wakoshi Japan, cf. Yatsuhashi and Hashimoto (1985)l. After irradiation, the cells were cultured for a further three days in abiolute darkness.…”

Section: Lighr Sources and Irrudiationmentioning

confidence: 99%

Light‐induced Synthesis of Anthocyanin in Carrot Cells in Suspension—iv. The Action Spectrum

Takeda

Abe

1992

Photochem & Photobiology

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Abstract— Using carrot cell suspension in 2,4‐dichlorophenoxyacetic acid (2,4‐D)‐depleted culture medium, fluence‐response curves for the formation of anthocyanin were determined at various wavelengths from 250 to 800 nm. In the fluence‐response curves at wavelengths between 260 and 330 nm, the response showed a sharp fluence‐dependent increase after the fluence exceeded threshold level at the respective wavelength. Such a sharp increase in response was not observed by light at 450 nm or longer wavelengths, although the response obtained by higher fluence of such light was always higher than that in the dark control. Action spectra determined at the sharp increasing phase of the response showed the single peak at 280 nm which equals the absorption maximum of UV‐B photoreceptor. Although red (R)‐light alone had a minor effect on anthocyanin accumulation, it modulated the action of UV‐B light. That is, when carrot cells were irradiated with R‐light either before or after UV‐B irradiation, anthocyanin formation was greatly enhanced above the level enhanced by UV‐B light alone. The most effective wavelength for this enhancement was 660 nm. The effect of R‐light on the anthocyanin formation of the UV‐B irradiated cells was reversed by immediately following it with far‐red light, suggesting the involvement of phytochrome in the R‐effect.

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“…In blue and near-UV light, flavins could sensitize the photooxidative reaction. Wavelengths of far-UV light that promote induction of anthocyanin synthesis, between 290 and 320 nm (120,125), are within the range where some metal-protein complexes, but not phytochrome, show absorption maxima (23,32,91). As expected, irradiation of plants with light of these wavelengths induces synthesis of enzymes in the pathway of anthocyanin synthesis without the involvement of phytochrome (14,49,120).…”

Section: Observations Predicted By the Hypothesismentioning

confidence: 81%

“Light-derepressible” genes are regulated by metal-protein complexes: A hypothesis

Hoober

1988

Carlsberg Res. Commun.

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The hypothesis is presented that genes whose expression is sensitive to light are regulated by metal-protein complexes. This hypothesis is based on induction of a gene for an Mr 21,000 polypeptide in the prokaryote Arthrobacter sp. by photodynamic conditions, chelating agents, or a decrease in pH. It is proposed that these conditions promote dissociation of a regulatory metal-protein complex by photooxidation of the metal-binding site, lowering the concentration of free metal ion, or protonation of amino acid side-chains in the metal-binding site, respectively. Repression of this gene is restored when cells are returned to the dark, metal ions are added in excess of chelating agents or the pH of the medium is returned to neutral. Restoration of repression is inhibited by chloramphenicol and novobiocin, which suggests that this process requires resynthesis of a regulatory protein and reassociation of the complex with DNA. The hypothesis predicts a number of characteristics of the regulatory system, most of which are found among the effects ofphytochrome. The well-documented effects of transition metal ions on the Pfr form ofphytochrome suggest that changes in gene expression in plants mediated by photoisomerisation of this chromoprotein are initiated by a chelating activity of Pfr-

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MULTIPLICATIVE ACTION OF A UV‐B PHOTORECEPTOR and PHYTOCHROME IN ANTHOCYANIN SYNTHESIS

Cited by 20 publications

References 14 publications

Effects of Ultraviolet-B Radiation on Terrestrial Plants

Effects of Ultraviolet-B Radiation on Terrestrial Plants

Light‐induced Synthesis of Anthocyanin in Carrot Cells in Suspension—iv. The Action Spectrum

“Light-derepressible” genes are regulated by metal-protein complexes: A hypothesis

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