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  • 1965-1969  (17)
  • 1
    Electronic Resource
    Electronic Resource
    Cotyledonary Stipules in the Myrtaceae (1966)
    [s.l.] : Nature Publishing Group
    Nature 210 (1966), S. 185-186 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE presence or absence of stipules is one of the most J[ consistent of the vegetative characters used by angio-sperm taxonomists and has considerable importance in both classification and identification of flowering plants. Unfortunately, much of the information in the standard works in English is ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/210185a0
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  • 2
    Electronic Resource
    Electronic Resource
    Operculum Development and the Taxonomy of Eucalypts (1968)
    [s.l.] : Nature Publishing Group
    Nature 219 (1968), S. 513-515 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We have already shown1 that the operculum is by no means uniform in structure or development throughout the genus. There is a large group of species in which the perianth whorls are separate from each other and form two opercula which fit one over the other. Both caps are deciduous, the inner one ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/219513b0
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of Flooding the Root System of Sunflower Plants on the Cytokin in Content in the Xylem Sap (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: The severe chlorosis observed in the lower most of flooded sunflower plants (Helianthus annuus L. cv. Tall Single) may lie initiated by a reduction in the import of cytokinins by the stoot from the flooded root system. Experiment indicates that during 12 hours following the release of flooding, plants previously flooded for 72 hours or less recover their ability to exude sap when the root systems are aerated, and the root systems synthesize and export amino-acids to the shoot. Plants flooded for longer periods lose these abilities. The metabolic activity of the root apices declines parallel with the decline in eytnkinin concentration in the sap with increase in flooding time up to 72 hours. Flooding for 96 hours drastically reduce all four parameters of root activity. After flooding for this period there was a large increase in the number of blackened and tetrazolium-negative root apices which were in all probability dead. The correlation between the metabolic activity of the root apices and the total cytokinin content of the sap supports tbe view that root apices may be sites of cytokinin synthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1969.tb09098.x
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  • 4
    Electronic Resource
    Electronic Resource
    Red Light Induction of Gibberellin Synthesis in Leaves (1968)
    [s.l.] : Nature Publishing Group
    Nature 217 (1968), S. 580-582 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1. The effect of red illumination on the gibberellin content of leaves of barley seedlings. A, Dwarf-1 maize assay; B, barley endosperm assay. Barley seedlings (variety 'Pallas') were grown in moist sand, in darkness, for 1 week at 25 C. Working in a green safe light6 a known number of 2 cm ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/217580a0
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  • 5
    Electronic Resource
    Electronic Resource
    Effects of a dwarfing compound, CCC, on the production and export of gibberellin-like substances by root systems (1967)
    Springer
    Planta 73 (1967), S. 1-11 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary (2-Chloroethyl)trimethylammonium chloride (Cycocel or CCC), an inhibitor of gibberellin biosynthesis, when repeatedly supplied to the root systems of balsam (Impatiens glandulifera Royle) plants reduces growth in height and the level of gibberellin-like substances in the bleeding sap that exudes from the stumps of detopped plants. Within twelve hours after a single application of the inhibitor to decapitated field peas (Pisum arvense), there are quantitative and qualitative changes in the gibberellins of the sap compared with those in sap collected over the same period of time from untreated plants. These changes are interpreted in terms of the possible blockage by CCC of normal gibberellin production and diversion of precursors into synthesis of “abnormal” gibberellins.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00419836
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  • 6
    Electronic Resource
    Electronic Resource
    Isolation, properties, and structure of fraction I protein from Avena sativa L (1968)
    Springer
    Planta 79 (1968), S. 254-267 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary 1. A method is described for the extraction and purification of Fraction I protein from Avena sativa L. leaves. 2. The protein possesses ribulose diphosphate carboxylase activity. Chromatography on gels of Sephadex G-200 separates phosphoribulokinase and ribose phosphate isomerase from the carboxylase. 3. The S°20w was calculated to be 18.2, the Stokes radius (determined by gel filtration on a cabibrated column) 74 Å, the molecular weight 5.7×105, and the frictional ratio 1.35. 4. An amino acid analysis is presented. 5. Electron microscope observations of negatively-stained Avena Fraction I protein molecules are compatible with the suggestion that they consist of 24 protomers disposed on the surface of an octahedral shell with 4:3:2 symmetry, and of diameter approximately 105 Å.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00396032
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  • 7
    Electronic Resource
    Electronic Resource
    Actinomycin-D inhibition of phytochrome-mediated responses (1966)
    Springer
    Planta 69 (1966), S. 70-78 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Actinomycin D vermag verschiedene phytochromgesteuerte Reaktionen etiolierter Pflanzen zu hemmen. So wird z. B. die von Rotlicht induzierte Aufrollung des ersten Blattes von im Dunkeln kultivierter Gerste besonders durch Act. D gehemmt, wenn man das Antibioticum ungefähr 80 min nach der Belichtung appliziert; spätere oder frühere Darbietung wirkt weniger oder überhaupt nicht. Die Hemmung wird durch Desoxyguanosin aufgehoben. Unter Berücksichtigung der bekannten Aktionsweise des Actinomycins D bei der DNS-abhängigen RNS-Synthese und der aus der Literatur bisher bekannten Tatsachen über phytochromgesteuerte Reaktionen muß vermutet werden, daß das Phytochrom eng an das DNS gebunden ist (vermutlich auch in Plastiden und Mitochondrien!) und als Repressor-System fungiert. Rotlicht löst diese Bindung und ermöglicht dadurch die Gen-Wirkung.
    Notes: Summary Actinomycin-D inhibits phytochrome-mediated responses of etiolated plants. In the unrolling response of a barley first leaf the inhibition by act. D is greater when the antibiotic is applied 80 minutes after irradiation; earlier or later applications are less inhibitory. Inhibition is relieved by deoxyguanosine applied before or after act. D. Similar effects are found with the plumular hooks of peas and beans. These results suggest that phytochrome-mediated responses involve RNA production on a DNA template. The location of phytochrome in the cell is discussed in relation to its possible association with DNA, especially that of the plastids and mitochondria. Phytochrome may thus act as a repressor of gene sequences involved (for instance) in the removal of etiolation symptoms, red light (660 nm) causing its dissociation from DNA. Far-red radiation may reverse the effects by causing re-association of phytochrome.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00380212
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  • 8
    Electronic Resource
    Electronic Resource
    Studies on leaflet abscission of blue lupin leaves (1967)
    Springer
    Planta 73 (1967), S. 357-368 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary In blue lupin leaves, each leaflet abscises at an abscission zone situated in the pulvinus at its base. The time to abscission of leaflets of detached leaves is proportional to leaf age. Light accelerates abscission; within certain limits the acceleration is the greater the younger the leaf. At a given concentration, kinetin applied to a single leaflet accelerates leaflet abscission in young leaves kept in darkness, delays it in older ones. There is an interaction between kinetin and light which is dependent also on leaf age and kinetin concentration. The leaf can be considered as consisting of three regions, the petiole, the pulvinar region and the leaflets. The effects of kinetin and of light as well as their interactions depent on the regions of the leaf treated with these agents. Kinetin applied to a leaflet of a young leaf kept in darkness accelerates abscission, but kinetin applied to the pulvinar region of a similar leaf kept in darkness delays abscission. When any part of a leaf is illuminated, abscission is accelerated. The most light-sensitive region of the leaf is the pulvinar region, despite its relatively small area. Acceleration of abscission by light is greatest when illumination of the pulvinar region is combined with illumination of either the leaflets or the petiole. The interaction of light with kinetin is complex. Where the illuminated area includes the pulvinar region, kinetin delays abscission. This effect is most marked in the case where the pulvinar region alone is illuminated and kinetin is applied to a leaflet. Intrafoliar abscission as found in lupin leaves permits study of complex interactions of both distal and proximal stimuli involved in abscission.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00385382
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  • 9
    Electronic Resource
    Electronic Resource
    Studies on the abscission of blue lupin leaves (1967)
    Springer
    Planta 73 (1967), S. 369-375 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The responses of three types of explants of blue lupin leaves are considered: pulvinar explants, consisting of the pulvinar region alone, petiolar explants, consisting of the pulvinar region plus petiole and laminar explants consisting of the pulvinar region plus leaflets. Abscission is accelerated by removal of the leaflets; removal of the petiole has much less effect. Pulvinar explants fail to abscise in darkness but are the first to abscise in the light. This is in accordance with previous evidence of high light sensitivity of the pulvinar region. Kinetin applied directly to the pulvinar region delays abscission, as does kinetin supplied via the transpiration stream. As shown by experiment, this is probably due to transported kinetin reaching the abscission zones of the pulvinar region. The effects of photoperiodic treatments on explants or whole leaves are described. Abscission in the whole leaf is delayed by short daily photoperiods; the delay reaches a maximum with 8 hours light per day. However, abscission is more rapid in continuous light than in darkness. Removal of the leaflets greatly accelerates abscission even in darkness. The pulvinar explant fails to abscise with photoperiods of 4 hours or less; although it appears to have a long day response, preliminary attempts failed to demonstrate that this is a true photoperiodic response (replacement of a long day by a short day together with a light break). The complex responses of leaves and explants to day length lend further support to the hypothesis that light has effects on abscission other than in photosynthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00385383
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  • 10
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    Actinomycin-D inhibition of phytochrome-mediated responses (1966)
    Springer
    Details
    Publication Date: 1966-01-01
    Print ISSN: 0032-0935
    Electronic ISSN: 1432-2048
    Topics: Biology
    Published by Springer
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