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  • 1
    Electronic Resource
    Electronic Resource
    Fluorescence characteristics of phytochrome and biliverdins (1973)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 95 (1973), S. 7892-7894 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00804a069
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  • 2
    Electronic Resource
    Electronic Resource
    FKF1 is essential for photoperiodic-specific light signalling in Arabidopsis (2003)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 426 (2003), S. 302-306 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Adaptation to seasonal change is a crucial component of an organism's survival strategy. To monitor seasonal variation, organisms have developed the capacity to measure day length (photoperiodism). Day-length assessment involves the photoperiodic control of flowering in Arabidopsis ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature02090
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  • 3
    Electronic Resource
    Electronic Resource
    BLUE-LIGHT PHOTORECEPTORS IN HIGHER PLANTS (1999)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Cell and Developmental Biology 15 (1999), S. 33-62 
    Details
    ISSN: 1081-0706
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology , Medicine
    Notes: Abstract In the past few years great progress has been made in identifying and characterizing plant photoreceptors active in the blue/UV-A regions of the spectrum. These photoreceptors include cryptochrome 1 and cryptochrome 2, which are similar in structure and chromophore composition to the prokaryotic DNA photolyases. However, they have a C-terminal extension that is not present in photolyases and lack photolyase activity. They are involved in regulation of cell elongation and in many other processes, including interfacing with circadian rhythms and activating gene transcription. Animal cryptochromes that play a photoreceptor role in circadian rhythms have also been characterized. Phototropin, the protein product of the NPH1 gene in Arabidopsis, likely serves as the photoreceptor for phototropism and appears to have no other role. A plasma membrane protein, it serves as photoreceptor, kinase, and substrate for light-activated phosphorylation. The carotenoid zeaxanthin may serve as the chromophore for a photoreceptor involved in blue-light-activated stomatal opening. The properties of these photoreceptors and some of the downstream events they are known to activate are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.cellbio.15.1.33
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  • 4
    Electronic Resource
    Electronic Resource
    A survey of the reciprocity characteristics of responses to end-of-day irradiations in oat, sunflower, and mung bean (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 5 (1982), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract. Fluence-response and reciprocity data were collected for response to end-of-day FR in several light-grown plants. Coleoptile elongation in oat and hypocotyl elongation in sunflower and mung bean are stimulated by end-of-day FR, and anthocyanin accumulation in mung bean hypocotyls is decreased by the same treatment. All responses have threshold fluences at about 200μmol m−2 and saturation fluences between 4000 and 10,000 μmol m−2 Responses to end-of-day FR were reversible by subsequent R with threshold fluences between 2.0 and 3.0 μmol m−2 and saturation fluences between 300 and 1000 μmol m2 Rapid, reverse reciprocity failure which could not be explained by escape from photoreversibility was observed only for stimulation of oat coleoptile elongation by end-of-day FR. Oats also showed apparent reverse reciprocity failure for R, but it was entirely explainable by escape. Rapid, reverse reciprocity failure is not a ubiquitous phenomenon for responses to end-of-day irradiations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.1982.tb00943.x
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  • 5
    Electronic Resource
    Electronic Resource
    Phytochrome-mediated responses in light-grown corn showing rapid, reverse reciprocity failure (1981)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 4 (1981), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract. Three responses (mesocotyl and coleoptile elongation and anthocyanin accumulation in the coleoptile) to end- of-day far-red irradiation in light-grown corn show rapid failure of the reciprocity law such that short, high fluence rate irradiations are much more effective than long, low fluence rate ones of the same fluence (reverse reciprocity failure). The reciprocity failure cannot be explained by escape from photoreversibility, a change in sensitivity to Pfr, reciprocity failure for photoconversion, or a high irradiance response taking over for long irradiation times. Fluence–response curves measured by varying irradiation time at a low fluence rate show the threshold fluence shifted to higher energy in comparison with fluence–response curves obtained at a high fluence rate. Red reversal of these responses also shows rapid reciprocity failure in the same direction, a process which can be only partially explained by escape.These responses to end-of-day far-red and red illumination are distinguished from high irradiance reactions by their low fluence requirements and ready reversibility. These same characteristics are similar to those of classical phytochrome- mediated, induction-reversion responses in etiolated tissue, but it is difficult to explain the rapid, reverse reciprocity failure in terms of standard phytochrome dogma.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/1365-3040.ep11604664
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  • 6
    Electronic Resource
    Electronic Resource
    The photoperceptive sites and the function of tissue light-piping in photomorphogenesis of etiolated oat seedlings (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 5 (1982), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract. Responses to red light irradiation of discrete areas along the intact, etiolated oat seedling indicate that illumination of the region around the coleoptilar node results in maximal coleoptile growth stimulation and mesocotyl growth suppression. Quantitation of the fibre optic properties of these etiolated tissues shows that the amount of axially transmitted light is log linear as a function of distance for both the mesocotyl and coleoptile (plus primary leaf). Using the fibre optic properties of the tissues to predict the response of the etiolated seedling to defined illumination fields allows one to localize two sites of photoperception: although the mesocotyl response pattern can be explained by the action of a single site found near the top of the mesocotyl itself, the coleoptile response depends on irradiation of both the mesocotyl site and an additional site located just above the node. The very low- and the low-fluence responses of etiolated oats independently predict similar regions of the seedling as sites of photo-perception. The fibre optic properties of the seedling could allow the seedling to increase the effective light signal received by the photosensitive area significantly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/1365-3040.ep11571543
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  • 7
    Electronic Resource
    Electronic Resource
    Growth distribution during first positive phototropic curvature of maize coleoptiles (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 7 (1984), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abastract Measurements of growth increments on the shaded and the irradiated sides of phototropically stimulated maize (Zea mays L.) coleoptiles, obtained over the entire fluence range of the first positive curvature, indicate that the curvature is induced by growth stimulation on the shaded side and compensating inhibition on the irradiated side (length increments on the coleoptile flanks were determined 100 min after 30 s phototropic induction with blue light). At high fluences of blue light, overall stimulation of growth takes place, but this tendency is largely eliminated when only the tip of the coleoptile is irradiated. Time courses for growth increments obtained for the maximum first positive response show that the growth stimulation on the shaded side and the growth inhibition on the irradiated side commence almost simultaneously 20-30 min after the phototropic induction. The growth on the irradiated side almost ceases, but the growth rate on the shaded side is doubled, relative to the control rate. The onset of differential growth migrates basipetally from the tip at a velocity similar to that for polar auxin transport. The first positive phototropic response of the coleoptile is concluded to be the consequence of lateral redistribution of growth, which is not necessarily accompanied by changes in the net growth. The results are consonant with the Cholodny-Went theory of tropisms, in which lateral redistribution of auxin is considered to be the cause of tropic responses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.1984.tb01562.x
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  • 8
    Electronic Resource
    Electronic Resource
    The effect of δ-aminolevulinic acid on red light-induced unrolling of dark-grown barley leaf sections (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 54 (1982), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Unrolling of sections from dark grown barley leaves (Hordeum vulgare L. cv. Klages) was stimulated by red irradiation. The unrolling started after a lag phase of 6-8 h and was completed after 24 h. The effect of several keto and amino acids on leaf unrolling was compared with their effect on coleoptile segment expansion growth. Of the substances tested δ-aminolevulinic acid had the most inhibitive effect on leaf unrolling and the least inhibitive effect on coleoptile segment expansion growth. Prolonged treatment caused a strong inhibition of the unrolling but with a short tretment, a stimulation of the unrolling occurred. The inhibitive effect of δ-aminolevulinic acid was only found if the treatment started within 6-8 h after the red irradiation. Kinetin and gibberellic acid could decrease the inhibitory effect of δ-aminolevulinic acid. A possible role for δ-aminolevulinic acid working as a triggering substance for leaf unrolling is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1982.tb06315.x
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  • 9
    Electronic Resource
    Electronic Resource
    Rapid, reverse reciprocity failure for phytochrome control of its own accumulation (1981)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 4 (1981), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract. Fluence–response curves have been obtained for end-of-day far-red stimulation and red reversal of phytochrome accumulation in leaves of light-grown corn during darkness following a white-light period. The response to end-of-day far-red, but not to R, shows rapid, reverse reciprocity failure which cannot be explained by escape from photoreversibility. Because the Pfr/Ptot established by long, low fluence rate and short, high fluence rate exposures of the same total fluence is the same and can lead to vastly different responses, explanations for this phenomenon based simply on Pfr levels or Pfr/Ptot are inadequate. Reciprocity failure for end-of-day far-red is not necessarily coupled to reciprocity failure for red reversal of the far-red effect. The two phenomena must stem from different causes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/1365-3040.ep11604666
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  • 10
    Electronic Resource
    Electronic Resource
    New light on stem growth (1993)
    [s.l.] : Nature Publishing Group
    Nature 366 (1993), S. 110-111 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] BLUE light profoundly affects growth and development of higher plants, being responsible for a host of reactions including phototropism, inhibition of stem growth, promotion of leaf expansion and induction of gene expression. The longer-wavelength plant photoreceptor phyto-chrome has been ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/366110a0
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