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  • 1
    Electronic Resource
    Electronic Resource
    Cotyledonal chloroplasts in the hypogeal seeds of clementine (1987)
    Springer
    Planta 170 (1987), S. 300-307 
    Details
    ISSN: 1432-2048
    Keywords: Chloroembryophyte ; Chloroplast (differential development) ; Citrus ; Embryo (chloroplasts) ; Seed germination ; Thylakoid (polypeptides)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Clementine (Citrus nobilisxCitrus aurantium amara pumila) is a chloroembryophyte with green quiescent embryos and hypogeal germination. The cotyledonal chloroplasts have been studied during germination in the dark and under two different irradiances 120 and 240 μmol·m-2·s-1 throughout a period of three weeks. The plastids of the outer adaxial and inner regions develop differently. In the light, the former differentiate a photosynthetically active thylakoid system with an ultrastructural organization and a polypeptide composition resembling that of leaf chloroplasts. The “inner” chloroplasts maintain an organization reminiscent of chloroplasts of the quiescent embryo and never get beyond the photosynthesis/respiration compensation point; their differentiation pattern appears essentially the same under the two different irradiances. These observations and the germination in the dark indicate that the above differentiation is not strictly photodependent. The greening ability of the cotyledons provides, on occasion, an additional photosynthetic supply to this plant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00395020
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Intrathylakoidal crystal appearance during the vital cycle of spinach chloroplasts (1985)
    Springer
    Protoplasma 126 (1985), S. 153-157 
    Details
    ISSN: 1615-6102
    Keywords: Spinacia oleracea L. ; Chloroplast ontogenesis ; Chloroplast senescence ; Spinach chloroplasts ; Intrathylakoidal crystals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The entire vital cycle of chloroplasts was followed in spinach leaves, in order to determine the plastidial situations leading to the build-up of intrathylakoidal crystals. This kind of inclusion was noticed in the juvenile ontogenetic stages as well as in the senescent chloroplast stage, while intrathylakoidal crystals were not present in the mature organelles. The appearance of such crystals, which are known to consist of ribulose 1,5-diphosphate carboxylase, is interpreted as a consequence of an imbalance between enzyme level and membrane function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01287682
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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