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  • 1
    Electronic Resource
    Electronic Resource
    Mutational analysis of the pea phytochrome A chromophore pocket: Chromophore assembly with apophytochrome A and photoreversibility (1993)
    s.l. : American Chemical Society
    Biochemistry 32 (1993), S. 14165-14172 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00214a014
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  • 2
    Electronic Resource
    Electronic Resource
    Primary photoprocesses of phytochrome. Picosecond fluorescence kinetics of oat and pea phytochromes (1989)
    s.l. : American Chemical Society
    Biochemistry 28 (1989), S. 3265-3271 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00434a022
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  • 3
    Electronic Resource
    Electronic Resource
    Action spectra for polarotropism and phototropism in protonemata of the fern Adiantum capillus-veneris (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 61 (1984), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The action spectrum for polarotropism was determined, using the Okazaki large spectrograph, by brief irradiation with light between 260 nm and 850 nm in single-celled protonemata of the fern Adiantum capillus-veneris L., which had been cultured for 6 days in red light and then in the dark for 15 h. The action spectrum had a peak at around 680 nm. This effect was nullified by subsequent irradiaton with far-red light, and typical red/far-red reversibility was observed, indicating the involvement of phytochrome. Polarized ultraviolet or blue light had no effect on the direction of apical growth. The action spectrum for phototropism was also determined in the red light region by means of brief microbeam irradiation of a flank of the subapical region of the protonema. This spectrum showed a peak at 662 nm which was consistent with the absorption peak of phytochrome, but not with the peak of the action spectrum for polarotropism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1984.tb06335.x
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  • 4
    Electronic Resource
    Electronic Resource
    Inhibitory Effect of Gibberellins on Archegonial Differentiation in Lygodium japonicum (1977)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 39 (1977), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Archegonial differentiation in light-grown gametophytes of Lygodium japonicum was partially inhibited by exogenously applied gibberellin A3 (GA3) at a concentration of 10−6M, and fully prevented at 10−5M. The inhibitory effect was nullified by transferring the GA3-treated samples onto fresh media omitting GA3, so that the archegonial formation became discernible 6 days after the transplantation. The application of 10−4M GA3 to younger gametophytes brought about a complete inhibition of archegonial differentiation, whereas the same concentration applied to older gametophytes did not influence the process at all, indicating the timing of archegonial differentiation during the ontogeny. Activity spectrum of authentic gibberellins on the basis of concentrations inducing 50% inhibition of archegonial formation was obtained as follows: GA4= GA9 〉 GA7 〉 GA3 〉 GA1= GA5= GA8.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1977.tb04024.x
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  • 5
    Electronic Resource
    Electronic Resource
    Action Spectrum for the Timing of Photo-Induced Cell Division in Adiantum Gametophytes (1974)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 32 (1974), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The photo-induced cell division in single-celled protonemata of the fern Adiantum capillus-veneris was studied. When the protonemata were exposed to monochromatic light at 50 nm intervals between 350 and 750 nm, irradiations in the blue and near-ultraviolet regions effectively induced cell division, while wavelengths longer than 550 nm showed no such effect. As reciprocity between duration and intensity was observed within the range of incident energy used, the action spectrum for the frequency of the photo-induced cell divisions 24 h after irradiation was determined between 360 and 510 nm at 10 nm intervals. Furthermore, the previously known effect of phytochrome on the timing of the cell division was minimized by a short exposure to red light given immediately after the monochromatic irradiation. The resulting action spectra showed a peak in the neighborhood of 460 nm with shoulders and another peak in the near-ultraviolet region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1974.tb03155.x
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  • 6
    Electronic Resource
    Electronic Resource
    Phaseshifting of the photoperiodic flowering response rhythm in Pharbitis nil by red-light pulses (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 67 (1986), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The control by light of the flowering response rhythm in the short-day plant Pharbitis nil Choisy cv. Violet was examined by giving a single pulse of light at various times between 1 and 6 h after a 24-h light period. When the first circadian cycle of the rhythm was monitored, it was found that a pulse of red light given at 1, 2 or 3 h into a 72-dark period caused a 1-h delay of the phase of the response rhythm, while a pulse at 6 h caused a 2-h delay. These results support the hypothesis that, when red-light pulses are given at hourly intervals, they are as effective as continuous light in preventing the onset of dark timing because they repeatedly return the rhythm to the circadian time at which it is apparently suspended in continuous light. The perception of and response to continuous light and red-light pulses are also briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1986.tb05063.x
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  • 7
    Electronic Resource
    Electronic Resource
    Evidence for Naturally Occurring Inhibitors of Archegonial Differentiation in Lygodium japonicum (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 45 (1979), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Archegonial differentiation in prothallia of Lygodium japonicum was inhibited when the filtrate of conditioned medium or the extracts of prothallia with organic solvents were added to the medium. By varying the timing of treatment with the methanol extract, archegonial differentiation was shown to start at least 4 days before microscopically detectable change. The inhibitory effect of methanol extract was nullified by transferring the treated plants to a fresh medium omitting the methanol extract, so that the archegonial formation became discernible 6 days after the transfer.The inhibitory activity was stable in both acidic and basic solutions at room temperature, and was partially lost by boiling at pH 3 or 11 for 30 min. The inhibitor, which could be retrieved from the filtrate and the methanol extract, was fractionated into the neutral ethyl acetate fraction, but was not found in the acidic ethyl acetate fraction and in the aqueous residue. At least two active zones were separated on thin layer chromatograms of the ethyl acetate extracts from the filtrate and the methanol extract, and the relative flow-rates of each active zone from these two sources were very similar. The evidence described above indicates that specific inhibitors of archegonial differentiation may be produced in the tissue of prothallia of Lygodium and eventually be secreted to the medium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1979.tb02588.x
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  • 8
    Electronic Resource
    Electronic Resource
    The composition of lipids and fatty acids determined at various stages of haploid and diploid generations in the fern Adiantum capillus-veneris (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 62 (1984), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The composition of lipids and fatty acids was determined at various developmental stages of gametophytes and sporophytes in the fern Adiantum capillus-veneris L. When the lipid content was expressed per g fresh weight, triacylglycerol was a major reserve lipid in spores and remained the dominant lipid in the gametophytes up to the 15th day after germination, but it was a minor one in the pinnae of sporophytes. In contrast, triterpenoids were abundant in sporophytes but not detected in gametophytes. When the content of fatty acids was expressed in percentage of the total fatty acids, the content of arachidonic acid in phosphatidylcholine and linolenic acid in diacyglyceryltrimethylhomoserine and phosphatidylcholine was significantly higher in both pinnae and petioles of sporophtes than in gametophytes. Significant differences in fatty acid composition of phosphatidylethanolamine, phosphatidylserine, phosphatidylinositol and triacylglycerol were also noted between gametophytes and pinnae of sporophytes. All these differences were attributed to the difference of generation rather than tissue differences or age.The content of monogalactosyldiacylglycerol, hexadecatrienoic acid in monogalactosyldiacylglycerol, and 3-trans hexadecenoic acid in phosphatidylglycerol was higher in the pinnae of sporophytes than in gametophytes or in young leaves of sporophytes. Electron microscopy of the ultrastructure of chloroplasts indicated that the high content of these components was consistent with the development of chloroplasts in pinnae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1984.tb00361.x
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  • 9
    Electronic Resource
    Electronic Resource
    Effects of viscosity on phototactic movement and period of cell rotation in Cryptomonas sp. (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 56 (1982), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The swimming speed, the period of cell rotation, and the critical dark period between intermittent light pulses in the positive phototactic response of Cryptomonas sp. strain IAM CR–1 were measured in the presence of methyl cellulose, which slows down the cell movement by raising the viscosity of the medium. The cell rotated once while it swam one pitch of the helical path, irrespective of the rotational period. The period of helical movement (the rotational period) was 0.65 s and 0.45 s in the presence and absence of 4.5 g/liter methyl cellulose, respectively. The phototactic response to repeated pulses of light could no longer be induced when the dark interval exceeded 0.33 s in medium with 4.5 g/liter methyl cellulose and 0.23 s in medium without it. The ratio of the critical dark period between repeated light pulses to the rotational period was always about 0.5, although the rotational period was lengthened 1.4 times with methyl cellulose. Thus, the present results clearly demonstrated that it is this ratio which is crucial for phototaxis, rather than the absolute length of the critical dark period.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1982.tb00324.x
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of in vitro Preincubation with Cofactors on the Activity of the Indoleacetic Acid Oxidase of Peas (1961)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 14 (1961), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1961.tb07952.x
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