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  • 1
    Electronic Resource
    Electronic Resource
    Chlorophyllide, the Probable Precursor of a Growth Inhibitor (1954)
    [s.l.] : Nature Publishing Group
    Nature 174 (1954), S. 312-313 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] When trying to separate the supposed chlorelline from the growth-promoting substances by shaking ether extracts with dilute hydrochloric acid or sodium bicarbonate, the chlorelline always disappeared from the alkaline as well as from the acid solutions, and also from any remaining ether extract. It ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/174312b0
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  • 2
    Electronic Resource
    Electronic Resource
    On the relation between the formation of assimilatory pigments and the rate of photosynthesis in etiolated oat seedlings
    Amsterdam : Elsevier
    BBA - Biochimica et Biophysica Acta 5 (1950), S. 186-196 
    Details
    ISSN: 0006-3002
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0006-3002(50)90163-6
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  • 3
    Electronic Resource
    Electronic Resource
    Thoughts on the possible role of phytochrome destruction in phytochrome controlled responses (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 6 (1983), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract. Fluence-response curves for low-energy phytochrome responses show two steps at red light exposures c. two orders of magnitude apart. This Feature of the fluence-response relationship can be interpreted as the consequence of the following processes:〈list xml:id="l1" style="custom"〉1Induction of a photoresponse by a very low level of Pfr.2Activation of a Pfr-destroying enzyme above a threshold level of [Pfr].3Dependency of the rate of Pfr destruction on [Pfr] once the threshold level is reached.In this way, adaptation of the phytochrome control system to a broad range of light doses could be realized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/1365-3040.ep11587614
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  • 4
    Electronic Resource
    Electronic Resource
    The influence of de-etiolation on the sensitivity of Avena coleoptiles to the far-red absorbing form of phytochrome (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 65 (1985), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: In photoresponses regulated by phytochrome the effect of a red irradiation is not always reversed by far-red. This applies for instance to the influence of red light on the geotropic reactionsof Avena coleoptiles. We could induce red/far-red reversibility by a short de-etiolating exposure to red light about 20 h prior to the experimental irradiations. This, was due to a decrease of the sensitivity to the low level of the far-red absorbing form of phytochrome that is established by far-red. Since etiolated plants react also to a wavelength of 520 nm (green light), it is advisable to expose the coleoptiles to a de-etiolating irradiation prior to manipulations in green safelight in order to prevent the plants from reacting to the green light.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1985.tb08685.x
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  • 5
    Electronic Resource
    Electronic Resource
    Differences in the nature of thermodormancy and far-red dormancy in lettuce seeds (1981)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 53 (1981), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Lettuce seeds cv. Noran germinate at 23°C in light as well as in darkness. However dormancy can be induced either by a long exposure (24 h) to far-red radiation or by an exposure of 48–72 h to a temperature of 37°C. The difference in response of these two types of dormant seeds to conditions inducing germination indicate that in both types Pfr is inactivated, but that a dark process required for immediate action of Pfr does not proceed at 37°C as it does during far-red radiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1981.tb02750.x
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  • 6
    Electronic Resource
    Electronic Resource
    An irreversible red-light-induced growth response in Avena (1968)
    Springer
    Planta 82 (1968), S. 87-104 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The inhibition of the growth rate of the first internode of Avena by red light occurs in three steps. The first step reduces elongation by ca. 15%. It is produced and saturated by 10-3 to 10-1 μW sec cm-2 at λ=660 nm and is irreversible by far-red irradiation. All wavelengths between 400 and 800 nm produce and saturate this step. The second step, produced by red light quantities between ca. 10 and 104 μW sec cm-2 reduces elongation to ca. 50% of the maximal; it is not produced by far-red light but far-red reverses completely this component of the effect of red light. The third step inhibits mesocotyl elongation to ca. 95% of the maximal. The effect of red light in this step depends on the duration of irradiation rather than on the total quantity of energy, and is not reversed by far-red irradiation. The three inhibition steps in the elongation of the mesocotyl are matched by three growth-promotion steps in the growth of the coleoptile, but the extent of the far-red-irreversible first step outweighs in this case by far the extent of the far-red-reversible second step.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00384699
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of red light on irreversible and reversible expansion of Avena coleoptile sections (1966)
    Springer
    Planta 71 (1966), S. 291-304 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary 1. The increase in the plasticity of Avena coleoptile sections by auxin which has been found in external solutions with an osmotic value, lower than a critical value (Cleland, 1959) is observed only in sections from red-irradiated coleoptiles. Irradiation with red light of sections, taken from dark-grown seedlings and cut in dim green light, has no effect on the plasticity of the sections. 2. Different zones of the coleoptile show different responses to small and large doses of red light. 3. Exposure of the coleoptiles to red light during two minutes (Intensity 40 μW.cm-2) induces a short-term increase of plasticity of the sections (90 minutes after irradiation) in solutions of low osmotic value. This short-term effect of red light interferes with a long-term (16 hours after irradiation) decrease of the suction force of the sections and a decrease of plasticity over the whole range of osmotic values, between pure buffer and the value causing incipient plasmolysis. 4. Only the long-term reduction of plasticity is reversed by far-red irradiation applied after the red irradiation. 5. In most cases, the elastic stretching was not influenced by red light when applied 90 minutes before sectioning, but in some experiments it was increased.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00384890
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  • 8
    Electronic Resource
    Electronic Resource
    Action spectra for light-induced germination in dormant lettuce seeds (1979)
    Springer
    Planta 144 (1979), S. 133-136 
    Details
    ISSN: 1432-2048
    Keywords: Action spectrum ; Dormancy (seeds) ; Germination (seeds) ; Lactuca ; Phytochrome
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Light of wavelengths in the range 400–500 nm induces germination of seeds of Lactuca sativa L. (cv. Noran and May Queen) when made light requiring by high temperature (thermodormancy) or prolonged exposure to far red light (far red dormancy). TD seeds proved more sensitive to blue light than FRD seeds by several orders of magnitude. Blue induced germination could be reversed by far red. Fluence response curves for this reversion are less steep for TD than for FRD seeds. The degree of germination of TD seeds after moderate doses of blue light is decreased by dark storage at 22° C or by exposure to far red and this is accompanied by a marked change in the shape of the fluence response curves. In these respects, germination induction by blue resembles that by red light. Continuous exposure to blue light inhibits germination of TD seeds but hardly that of FRD seeds. An action spectrum is given for blue induced germination of TD seeds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00387261
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  • 9
    Electronic Resource
    Electronic Resource
    Action spectra for light-induced germination in dormant lettuce seeds (1979)
    Springer
    Planta 144 (1979), S. 125-131 
    Details
    ISSN: 1432-2048
    Keywords: Action spectra ; Dormancy (seeds) ; Germination (seeds) ; Lactuca ; Phytochrome
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Fluence response curves for red light-induced germination of thermodormant (TD) seeds of Lactuca sativa L. show two regions that differ in their light sensitivity. In the region of high sensitivity, the germination responses differ between seed batches and can be altered by dark storage or far red irradiation. Induction of germination in far red dormant (FRD) seeds requires far higher fluences. Action spectra for induction to 60% germination were determined for these various response types. Spectra for the regions of low sensitivity response are similar for TD and FRD seeds. In comparison, the action spectrum for the highly sensitive response in TD seeds is significantly shifted to longer wavelengths. Analogous differences exist in the action spectra for far red reversal of the red induced germination responses. Germination induction in the low sensitivity region shows repeated red-far red reversibility. Far red reversal of red induction in the high sensitivity region does not saturate even at the highest far red fluences available and requires increased red fluences for subsequent reinduction. A model quantitatively accounting for these observations is presented. It is pointed out that action spectra of processes involving photoreversible pigments with partly overlapping absorption spectra in general are not identical with the absorption spectra of the partners. They should depend upon the degree of phototransformation required to elicit a given physiological response. In the case of induction of lettuce seed germination the observed action spectra can be interpreted as reflecting different requirements for P fr of the various response types. Our results do not necessitate the assumption of spectroscopically different forms of phytochrome in these seeds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00387260
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  • 10
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    Action spectra for light-induced germination in dormant lettuce seeds (1979)
    Springer
    Details
    Publication Date: 1979-01-01
    Print ISSN: 0032-0935
    Electronic ISSN: 1432-2048
    Topics: Biology
    Published by Springer
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