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  • 1
    Electronic Resource
    Electronic Resource
    PHOTOPROTECTION REVISITED: Genetic and Molecular Approaches (1999)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Plant Physiology and Plant Molecular Biology 50 (1999), S. 333-359 
    Details
    ISSN: 1040-2519
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Notes: Abstract The involvement of excited and highly reactive intermediates in oxygenic photosynthesis poses unique problems for algae and plants in terms of potential oxidative damage to the photosynthetic apparatus. Photoprotective processes prevent or minimize generation of oxidizing molecules, scavenge reactive oxygen species efficiently, and repair damage that inevitably occurs. This review summarizes several photoprotective mechanisms operating within chloroplasts of plants and green algae. The recent use of genetic and molecular biological approaches is providing new insights into photoprotection, especially with respect to thermal dissipation of excess absorbed light energy, alternative electron transport pathways, chloroplast antioxidant systems, and repair of photosystem II.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.arplant.50.1.333
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A pigment-binding protein essential for regulation of photosynthetic light harvesting (2000)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 403 (2000), S. 391-395 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Photosynthetic light harvesting in plants is regulated in response to changes in incident light intensity. Absorption of light that exceeds a plant's capacity for fixation of CO2 results in thermal dissipation of excitation energy in the pigment antenna of photosystem II by a poorly ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35000131
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  • 3
    Electronic Resource
    Electronic Resource
    Singlet oxygen and photo-oxidative stress management in plants and algae (2005)
    Oxford, UK : Blackwell Science Ltd
    Plant, cell & environment 28 (2005), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Photosynthetic organisms constantly face the threat of photo-oxidative stress from fluctuating light conditions and environmental stress. Plants and algae have developed an array of defences to protect the chloroplast from reactive oxygen species. Genetic and physiological studies have shown that antioxidant responses are important to high-light acclimation, both by directly scavenging or quenching reactive oxygen intermediates and by contributing reducing power for alternative electron transport pathways and excess energy dissipation. At present, the signalling events leading to up-regulation of antioxidant defences in high light remain a mystery. Recent advances toward understanding acclimation to oxidative stress in both photosynthetic and non-photosynthetic model organisms may illuminate how plants and algae respond to high-light stress. Although the role of hydrogen peroxide in high-light acclimation has been investigated, less is known about responses to singlet oxygen, a form of reactive oxygen that poses a significant threat specifically to photosynthetic organisms. This review will discuss some intriguing new findings in that area, focusing on recent findings regarding the nature of singlet-oxygen responses in the chloroplast.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.2005.01374.x
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  • 4
    Electronic Resource
    Electronic Resource
    Dna insertional mutagenesis for the elucidation of a Photosystem II repair process in the green alga Chlamydomonas reinhardtii (1997)
    Springer
    Photosynthesis research 53 (1997), S. 173-184 
    Details
    ISSN: 1573-5079
    Keywords: Chlamydomonas reinhardtii ; mutagenesis ; photoinhibition ; Photosystem II ; repair cycle ; transformation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The work outlines the isolation of transformant Chlamydomonas reinhardtii cells that appear to be unable to repair Photosystem II from photoinhibitory damage. A physiological and biochemical characterization of three mutants is presented. The results show differential stability for the D1 reaction center protein in the three mutants compared to the wild type and suggest lesions that affect different aspects of the Photosystem II repair mechanism. In the ag16.2 mutant, significantly greater amounts of D1 accumulate in the thylakoid membrane than in the wild type under steady-state growth conditions, and D1 loss is significantly retarded in the presence of the protein biosynthesis inhibitor chloramphenicol. Moreover, aberrant electrophoretic mobility of D1 in the ag16.2 suggests that this protein is modified to an as yet unknown configuration. These results indicate that the biosynthesis and/or degradation of D1 is altered in this strain. A different type of mutation occurred in the kn66.7 and kn27.4 mutants of C. reinhardtii. The stability of D1 declined much faster as a function of light intensity in these mutants than in the wild type. Thereby, the threshold of photoinhibition in these mutants was significantly lower than that in the wild type. It appears that kn66.7 and kn27.4 are similar conditional mutants, with the only difference between them being the amplitude of the chloroplast response to the mutation and the differential sensitivity they display to the level of irradiance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005867709441
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  • 5
    Electronic Resource
    Electronic Resource
    The Molecular Biology of Chloroplasts and Mi-tochondria in Chlamydomonas. Edited by J.-D. Rochaix, M. Goldschmidt-Clermont and S. Merchant. Advances in Photosynthesis, Vol. 7, 1998 (1999)
    Springer
    Photosynthesis research 61 (1999), S. 97-98 
    Details
    ISSN: 1573-5079
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006201001802
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