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  • 1
    Electronic Resource
    Electronic Resource
    Photoregulation of the incorporation of guaiacyl units into lignins (1979)
    Springer
    Planta 146 (1979), S. 281-286 
    Details
    ISSN: 1432-2048
    Keywords: Guaiacyl units ; Light effect ; Lignification ; Membrane permeability ; Populus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract When fed with [14C] phenylalanine in the light, xylem tissues isolated from poplar stems were able to incorporate part of the radioactivity into both the guaiacyl and the syringyl residues of lignins. In the dark, only syringyl units were integrated into the polymer whereas the guaiacyl residues remained unlabeled. When a membrane perturber (isopropanol) was added to the incubation mixture, the label was incorporated into the guaiacyl units either in the light or in the dark. Conversely, a membrane stabilizer (CaCl2) prevented the labeling of the guaiacyl units even when the tissues were illuminated. These results suggest that light acts through the modification of membrane permeabilities, altering specifically the synthesis and the transport or the polymerization of guaiacyl-type units during the process of lignification.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00387799
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  • 2
    Electronic Resource
    Electronic Resource
    Isoenzymes of hydroxycinnamate: CoA ligase from poplar stems properties and tissue distribution (1983)
    Springer
    Planta 158 (1983), S. 225-229 
    Details
    ISSN: 1432-2048
    Keywords: Hydroxycinnamate: CoA ligase (tissue distribution) ; Lignification ; Populus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Three different forms of hydroxycinnamate: CoA ligase (EC 6.2.1-) have been separated by chromatofocusing from poplar stems. These three forms exhibit different substrate specificities and tissue distribution. A correlation was established between the monomeric composition of lignins isolated from xylem and sclerenchyma and the pattern of hydroxycinnamate: CoA ligase isoforms in these tissues. The results obtained indicate that, in poplar, the hydroxycinnamate: CoA ligase isoenzymes could play an important role in the control of the monomeric composition of lignins.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01075258
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  • 3
    Electronic Resource
    Electronic Resource
    Inhibition of cinnamyl-alcohol-dehydrogenase activity and lignin synthesis in poplar (Populus x euramericana Dode) tissues by two organic compounds (1985)
    Springer
    Planta 163 (1985), S. 232-237 
    Details
    ISSN: 1432-2048
    Keywords: Cinnamyl alcohol dehydrogenase ; Lignification ; Populus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Two organic compounds, N-(O-hydroxyphenul)-and N-(O-aminophenyl)sulfinamoyltertiobutyl acetate (OHPAS and NH2PAS, respectively) have been designed for inhibiting cinnamylalcohol dehydrogenase (EC 1.1.1.2), a zinc metalloenzyme involved specifically in lignification. This paper describes their effects in vitro on the activity of the enzyme isolated from poplar and in vivo on the lignification of poplar tissues. The enzyme inhibition was time- and dose-dependent and pseudoirreversible indicating that these compounds could act as suicide inhibitors. Neither OHPAS nor NH2PAS exhibited affinity towards other plant zinc metalloenzymes or phenolic enzymes tested. Only NH2PAS exerted an effect on cinnamoyl: CoA reductase, another specific enzyme of lignification. In addition, these inhibitors, at the concentration of 80 μM, reduced the fluxes of lignin synthesis in poplar stems by 45%. These results show that OHPAS and NH2PAS could become useful tools for reducing lignification in plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00393512
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