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  • 1
    Electronic Resource
    Electronic Resource
    The greening process in cress seedlings. II. Complexing agents and 5-aminolevulinate inhibit accumulation of cab-mRNA coding for the light-harvesting chlorophyll a/b protein (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 81 (1991), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Dark-green cress seedlings were treated with 5-aminolevulinate (ALA) or the metal complexing agents 2,2′-bipyridyl and 8-hydroxyquinoline. The subsequent induction of cab-mRNA coding for the light-harvesting chlorophyll a/b protein (LHCP) by white or far-red light was investigated. Pretreatment with ALA 48 h after sowing yielded increased levels, the same pretreatment 72 or 96 h after sowing decreased levels of cab-mRNA. The strongest inhibition of light induction of cab-mRNA was found by pretreatment with 2,2′-bipyridyl. Less inhibition was obtained by pretreatment with 8-hydroxyquinoline. Steady-state levels of transcripts which are not light-regulated (actin, psbA) were only slightly decreased by pretreatment with ALA or the metal chelators, whereas no decrease was found for mRNA coding for NADPH: protochlorophyllide oxidoreductase. Run-off transcription with isolated nuclei showed that the transcription rate was reduced by pretreatment of intact plants with the metal chelator 2,2′-bipyridyl. The results are discussed in the context of current proposals for the role of transition metals. ALA, and chlorophyll precursors in light-induction of gene expression.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1991.tb02128.x
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  • 2
    Electronic Resource
    Electronic Resource
    The greening process in cress seedlings. I. Pigment accumulation and ultrastructure after application of 5-aminolevulinate and complexing agents (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 81 (1991), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: A reduced rate of greening after continuous illumination was observed in dark-grown cress seedlings (Lepidium sativum L.) incubated with 5-aminolevulinate (ALA) or the complexing agents 2,2′-bipyridyl, 8-hydroxyquinoline or 1,10-phenanthroline. This effect cannot be explained merely by photodynamic damage caused by chlorophyll precursors which are accumulated in the dark under these conditions. Flash light experiments revealed that photoconversion of protochlorophyll(ide) to chlorophyllide was not influenced by chelator treatment. The next step in the chlorophyll pathway, the esterification of chlorophyllide, however, was inhibited. Simultaneously applicated ALA and complexing agents did not result in a synergistic reponse; on the contrary, ALA seemed to render cress plants less susceptible to the treatment with complexing agents upon subsequent irradiation. Ultrastructural studies demonstrated that grana formation in light was inhibited after pretreatment with ALA or complexing agents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1991.tb01726.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of 1,10-phenanthroline on ultrastructure of pea leaves (1991)
    Springer
    Protoplasma 161 (1991), S. 23-30 
    Details
    ISSN: 1615-6102
    Keywords: 1,10-Phenanthroline ; Photodynamic herbicides ; Pisum sativum ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We have examined ultrastructural changes of mesophyll cells in pea leaves induced by the photodynamic herbicide 1,10-phenanthroline (Phe). Dark incubation of pea plants did not cause any damage in plants or changes in the ultrastructure of mesophyll cells. Two hours of illumination after pretreatment with Phe caused photooxidative damage in plant but was not sufficient to markedly change the ultrastructure, although dilation of endoplasmic reticulum (ER) cisternae occurred. Illumination for 12 h caused inhibition of grana formation in pretreated plants. These ultrastructural changes and the inhibition of chlorophyll (Chl) accumulation may be due to the inhibition of transport of certain proteins to the plastids, diminished accumulation of chlorophyll proteins (e.g., LHCP) and a decrease in activity of the chlorophyll synthetase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01328894
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    Paper (German National Licenses)
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