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  • 1
    Electronic Resource
    Electronic Resource
    The Correlation of Biological Activity of Plant Growth Regulators and Chloromycetin Derivatives with Hammett Constants and Partition Coefficients (1963)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 85 (1963), S. 2817-2824 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00901a033
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  • 2
    Electronic Resource
    Electronic Resource
    Auxin Activity of Glucobrassicin (1966)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 19 (1966), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The indole-glucosinolate, glucobrassicin, which is found in large amounts in members of the genus Brassica, was subjected to tests in the standard Avena curvature bioassay. Both the tetramethylammonium salt of glucobrassicin and the non-crystallizted material induced curvature at a concentration of 5 × l0−4M. The curvature from the salt was, however, only half of that induced by the acid form.Bioassays of chromatograms of fresh methanolic extracts of savoy cabbage indicated the presence of indole-3-acetic acid as well as indole-3-acetonitrile in small amounts along with large amounts of glucobrassicin.Segments of green hypocotyl tissue of savoy cabbage respond with limited growth to high concentrations of glucobrassicin. Segments of etiolated hypocotyls or green epicotyls give no growth response to glucobrassicin.Pea stem segments which do not respond to indoleacetonitrile responded with similar growth to glucobrassicin and indoleacetic acid.Nitrilase activity was found in savoy hypocotyl and epicotyl tissue by chromatography of incubation media.The growth regulation in savoy cabbage in conjunction with data on the distribution of glucobrassicin in the plant, leads to the conclusion that glucobrassicin is a special, inactive storage and transport form of the active auxin in cabbage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1966.tb07094.x
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  • 3
    Electronic Resource
    Electronic Resource
    Correlation of Biological Activity of Phenoxyacetic Acids with Hammett Substituent Constants and Partition Coefficients (1962)
    [s.l.] : Nature Publishing Group
    Nature 194 (1962), S. 178-180 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] If a specific position on the aromatic ring is involved, and not the ring as a whole, then an examination of the effect of substituents should indicate what the ideal electronic character of this point should be. Early qualitative work5 indicated that groups which lowered the electron density at ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/194178b0
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of light in the control of growth by auxin and its inhibitor(s) in the sunflower (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 57 (1983), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Diffusates from the hypocotyl and leaves of sunflower seedlings (Helianthus annuusL. cv. Mammoth) contain both auxin and inhibitor(s) of auxin-induced growth. The auxin activity has been evaluated with the conventional Avena coleoptile bioassay employing negative curvature, The inhibitor activity has been determined with a newly developed bioassay, measuring the positive curvature response of the Avena coleoptile. This bioassay has been standardized by the response to 2,3,5-triiodo-benzoic acid. Diffusates from plants in darkness have higher auxin activity and lower inhibitor activity than diffusates from plants in light. Irradiation at 730 nm promotes auxin synthesis in leaves, and! irradiation at 660 nm promotes synthesis of the inhibitor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1983.tb02760.x
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  • 5
    Electronic Resource
    Electronic Resource
    The Effect of Potassium on Cotyledon Expansion Induced by Cytokinins (1978)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 43 (1978), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Potassium has been found to enhance greatly the expansion response of cucumber cotyledons to cytokinins. A reduction of the response to kinetin is obtained with increasing age of the cotyledons. The lesser response is associated with lower levels of potassium remaining in the cotyledon. A high level of KCI in the incubation medium offsets the lower potassium content of the tissue and enables a much larger response to the cytokinins. At 40 mM KCI the response to kinetin is 4.2 times greater than in the absence of KCI. Calcium increases the effect of potassium on the response to kinetin. When incubated in 40 mM KCI and 10 mM CaCI2 with 10 mg/I 6-benzylamino-purine, the final weight of the cotyledons is 6.8 times the initial weight after just 4 days. This KCI-CaCI2 combination is also found to promote chlorophyll synthesis in the usual cucumber cotyledon bioassay.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1978.tb02566.x
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  • 6
    Electronic Resource
    Electronic Resource
    Auxin Physiology of Dwarfism in Pisum sativum (1969)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 22 (1969), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Similar levels of diffusible auxin are measured for the apices of both Little Marvel (dwarf) and Alaska (normal) cultivars of the pea when grown in sunlight and darkness. In sunlight, however, diffusible auxin disappears in the subtending internode of the Little Marvel plant but remains at 50 per cent of the level of the apex in the subtending internode of the Alaska plant. The enzyme preparation from the apex of the dwarf plant converts tryptophan and tryptamine to IAA more readily than that from the normal plant. Indoleacetyl aspartate synthetase activity is also higher in the dwarf plant than in the normal plant and the dwarf plant contains four times as much conjugate as the normal plant with or without treatment with gibberellic acid. Gibberellic acid (GA) does not affect the induction of the synthetase enzyme nor the enzymatic formation of indoleacetyl aspartate. The growth induced by GA is the result of an increased synthesis of auxin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1969.tb07393.x
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  • 7
    Electronic Resource
    Electronic Resource
    Gibberellin Induced Changes in Diffusible Auxins from Savoy Cabbage (1969)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 22 (1969), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Diffusates from apices of young plants of savoy cabbage treated with gibberellie acid (GA) and apices of control plants have been examined with respect to their content of Indole auxins. Three indole Compounds were detected and identified on the basis of their chromatographic characteristics in several systems. These compounds were: glucoubrassicin, indole-3-acetic acid (IAA) and indole-3-acetonitrile (IAN).An effect of GA on the total auxin activity of the diffusate was noted 90 hours after treatment, while an increase in stem height occurred 48 hours later. This increase in auxin effect of the entire diffusates was shown bv chromogenic development and bioassay of chromatograms of diffusates to be a result of an increase in level of the IAA content. A concomitant decrease in I the glucobrassicin content was indicated.Since GA was found to have no effect on the enzymatic conversion of tryptophan or tryptamine to IAA, it is proposed that the effect of GA is on the conversion of glucobrassicin to IAA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1969.tb07386.x
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  • 8
    Electronic Resource
    Electronic Resource
    An Analysis of the Role of Potassium in the Growth Effects of Cytokinin, Light and Abscisic Acid on Cotyledon Expansion (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 46 (1979), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: High external concentrations of potassium were found to promote light-induced growth of cucumber cotyledons similarly to the effects previously observed for the growth induced by cytokinins. At 40 mM KCl, the response to white light was 3.6 times greater than in the absence of KCl. The promotive effect of calcium on the growth induced by cytokinin was not observed for light. In 40 mM KCl and 10 mM CaCl2, the responses to light and cytokinin were similar and additive. Both near-red and far-red light induced growth at low intensities. The response to white light at low intensities was sharply increased with higher intensity up to 24 μE m-2 s-1 and only slightly increased above that level.Abscisic acid was found to inhibit strongly the responses to light and cytokinin. The inhibition was greater in the presence of KCl than in its absence and thus abscisic acid appeared to inhibit primarily by its interference with potassium uptake. Kinetic analysis found the light response promoted by potassium to be inhibited competitively by abscisic acid, with the light response having a Km of 34 mM KCl and a Vmax of 115 mg/cotyledon × 4 days. The inhibition of the cytokinin response by abscisic acid was noncompetitive in relation to potassium, having a Km of 1 mM KCl and a Vmax of 50 mg/cotyledon × 4 days.It is suggested that cytokinin, light and abscisic acid have primary properties affecting membrane permeability and that their interaction with potassium is an explanation of many similarities between light and cytokinin responses and their inhibition by abscisic acid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1979.tb03179.x
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  • 9
    Electronic Resource
    Electronic Resource
    Diffusible auxin increase in a rosette plant treated with gibberellin (1963)
    Springer
    Naturwissenschaften 50 (1963), S. 337-338 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00645952
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  • 10
    Electronic Resource
    Electronic Resource
    Azulene Derivatives as Plant Growth Regulators (1961)
    [s.l.] : Nature Publishing Group
    Nature 190 (1961), S. 741-742 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Ferroceneacetic acid, ferrocenediacetic acid and ferrocenepropionic acid are all completely inactive in cell elongation as shown by their lack of effect on 3-mm. segments of Avena coleoptiles8. However, as shown in Table 1, some azulene derivatives have high activity in promoting cell elongation. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/190741a0
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