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  • Gibberellin  (4)
  • Springer  (4)
  • American Chemical Society
  • Cambridge University Press
  • 1980-1984
  • 1975-1979  (4)
  • 1979  (4)
Collection
Keywords
Publisher
  • Springer  (4)
  • American Chemical Society
  • Cambridge University Press
Years
  • 1980-1984
  • 1975-1979  (4)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Stem growth, flower formation, and endogenous gibberellins in a normal and a dwarf strain of Silene armeria (1979)
    Springer
    Planta 145 (1979), S. 175-180 
    Details
    ISSN: 1432-2048
    Keywords: Dwarfism ; Flower formation ; Gibberellin ; Grafting ; Photoperiodism ; Silene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The physiological basis of dwarfism in a single-gene, recessive mutant of Silene armeria L. was investigated through comparison with a normal strain. Exposure of the normal strain to long days led to stem growth and flower formation while similar exposure of the dwarf strain led only to flowering, with very little stem growth. Application of gibberellin A3 or A4+7 in short days promoted stem elongation in the normal strain, but had a much lesser effect in the dwarf strain. Upon extraction and chromatographic fractionation of the endogenous gibberellins (GAs) in the normal strain of S. armeria, three zones of GA activity were found. An increase in one zone of activity was found in both strains after 1 long day. Neither the quality nor the quantity of the extractable GAs differed greatly between the dwarf and the normal strain. Vegetative dwarf scions, grafted onto fully induced, normal stocks formed flowers, but their growth habit was not changed. Thus, the lack of stem growth in response to long days in the dwarf strain appears to result from a lack of GA sensitivity in the stem tissue of these plants. However, during flower formation dwarf plants did exhibit elongation of the peduncles. This response was suppressed by the growth retardant 2-isopropyl-4-dimethylamino-5-methylphenyl-1-piperidine-carboxylate methyl chloride (AMO-1618), and applied GA3 could partially overcome this inhibition. Thus, peduncle elongation in the dwarf strain appears to be regulated by endogenous GAs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00388714
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Abscisic-acid and gibberellin action in developing kernels of triticale (cv. 6A190) (1979)
    Springer
    Planta 146 (1979), S. 249-255 
    Details
    ISSN: 1432-2048
    Keywords: Abscisic acid ; Amylase ; Cereal kernel ; Germination (seeds) ; Gibberellin ; Triticale
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Abscisic-acid (ABA) levels were determined in triticale 6A190 kernels at various stages of development from anthesis to maturity. ABA reached a maximum at ca. 22 d post-anthesis and declined rapidly 12 d later. Associated with drying of the kernel at maturity there was a rapid increase in the endogenous level of α-amylase, apparently based upon de-novo synthesis. Simultaneously there were visible signs of degradation of the large starch grains in the starchy endosperm. Regulation of α-amylase production in the kernel by exogenous gibberellic acid (GA3) was only evident in the almost mature kernel (30–40 d after anthesis) and then only if these kernels were first dried artificially. Furthermore, little α-amylase mRNA could be detected prior to kernel maturity and water loss. Thus, the high levels of gibberellin (GA) that have been found early in kernel development in cereals do not appear to control the later production of α-amylase and onset of kernel germination in the ear of triticale. However, the presence of high levels of ABA until maturity could prevent early germination and premature production of α-amylase. Kernels of triticale 6A190 are characteristically shrivelled and non-dormant at maturity. The relevance of changes in the capacity of kernels to respond to and produce GA and ABA is discussed in relation to problems of harvest dormancy in cereals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00387794
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  • 3
    Electronic Resource
    Electronic Resource
    Gibberellic-acid-promoted transport of assimilates in stems of Phaseolus vulgaris L. (1979)
    Springer
    Planta 145 (1979), S. 233-238 
    Details
    ISSN: 1432-2048
    Keywords: Assimilates ; Gibberellin ; Phaseolus ; Photosynthesis products (transport) ; Transport (assimilates)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Gibberellic acid (GA3), applied as a dispersion in aqueous lanolin to the stumps of decapitated stems of P. vulgaris plants, was found to promote the transfer of 14C-and 32P-labelled assimilates to the site of hormone application. Measurements of the component transfer processes, operating between source and sink (site of hormone application), showed that GA3 was not acting to promote assimilate transfer by increasing the photosynthetic rate of, or the assimilate export rate from the source, nor by altering the mobilizing ability of the competing root sink. Here, it also was found that the time between GA3 application and detection of an enhanced transport flux was independent of the length of the transport pathway. Overall, the evidence obtained indicated that GA3 was not acting on any transfer process remote from its point of hormone application but was acting locally at this latter point.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00454446
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  • 4
    Electronic Resource
    Electronic Resource
    Interaction of [3H]gibberellin A1 with a sub-cellular fraction from lettuce (Lactuca sativa L.) hypocotyls (1979)
    Springer
    Planta 147 (1979), S. 264-268 
    Details
    ISSN: 1432-2048
    Keywords: Gibberellin ; Growth ; Lactuca ; Protein-synthesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The relationship between protein synthesis and the incorporation of [3H]gibberellin A1 ([3H]GA1) into a 2,000xg pelletable (2KP) fraction from lettuce (Lactuca sativa L.) hypocotyl sections has been investigated. Concentrations of D-2-(4-methyl-2,6-dinitroanilino)-N-methylpropionamide (MDMP) between 10-7 M and 10-4 M caused increasing inhibition of growth, 2KP labelling and incorporation of [14C]leucine into soluble protein. Growth and 2KP radioactivity were highly correlated (r=0.996). Transfer to MDMP early or late in the course of GA response caused reductions in both growth and incorporation into the 2KP fraction. Exposure to the inhibitor had more effect at 4 h than at 20 h. The proportions of alkali-soluble and insoluble radioactivity in the 2KP fraction were also altered by this treatment. The implications of these findings are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00388749
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