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  • 1
    Electronic Resource
    Electronic Resource
    Biosynthesis of non-fluorescent chlorophyll of Photosystem II core in greening plant leaves. Effect of etiolated plants growing under heat shock conditions (38 °C) (1999)
    Springer
    Photosynthesis research 62 (1999), S. 185-195 
    Details
    ISSN: 1573-5079
    Keywords: chlorophyll a biosynthesis ; etiolated leaves ; heat shock ; maize ; pea ; pea mutants ; Photosystem II core ; protochlorophyllide photoreduction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Preliminary dark incubation of etiolated pea and maize plants at 38 °C allowed to observe a new dark reaction of Chl biosynthesis occuring after photoconversion of protochlorophyllide Pchld 655/650 into chlorophyllide Chld 684/676. This reaction was accompanied by chlorophyllide esterification and by the bathochromic shift of pigment spectra: Chld 684/676 → Chl 688/680. After completion of the reaction, a rapid (20–30 s at 26 °C) quenching of Chl 688/680 low-temperature fluorescence was observed. The reaction Chld 684/676 → Chl 688/680 was inhibited under anaerobic conditions as well as in the presence of KCN; the reaction accompanied by Chl fluorescence quenching was inhibited in the leaves of pea mutants with impaired function of Photosystem II reaction centers. The spectra position of newly formed Chl, effects of Chl fluorescence quenching allowed to assume that the new dark reaction is responsible for biosynthesis of P–680, the key pigment of Photosystem II reaction centres.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006370623652
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  • 2
    Electronic Resource
    Electronic Resource
    A comparative study of the terminal stages of chlorophyll biosynthesis before and after heavy water (D2O) introduction into greening plant leaves (1998)
    Springer
    Photosynthesis research 56 (1998), S. 83-93 
    Details
    ISSN: 1573-5079
    Keywords: chlorophyll a biosynthesis ; deuterium oxide substitution ; inhibition of chlorophyll biosynthesis ; protochlorophyllide phototransformation ; maize (Zea mays)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract By spectral methods, the final stages of chlorophyll formation from protochlorophyllide proceeding in intact greening maize leaves were studied before and after the introduction of heavy water (D2O) into etiolated leaves. Three effects of D2O introduction were observed: 1) a complete inhibition of the reaction pathway leading to pheophytin biosynthesis and formation of pheophytin/chlorophyll-containing complexes (presumably, direct precursors of Photosystem II reaction centers): 2) 5-fold inhibition of the reaction of the Shibata shift ; 3) appearance of a new dark reaction of the primary chlorophyllide native form Chld 684/676→ 'Chld 690/680'. It was shown that the intermediate Chld 684/676 presents the point of a triple branching of chlorophyllide transformation; activities of these three parallel pathways of Chld 684/676 transformation can be regulated by light intensity as well as by temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005913616050
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    Paper (German National Licenses)
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