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  • Aquatic angiosperm (photosynthesis)  (1)
  • Cercis siliquastrum  (1)
  • Etioplasts  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Photosynthetic strategies in leaves and stems of Egeria densa (1991)
    Springer
    Planta 185 (1991), S. 297-303 
    Details
    ISSN: 1432-2048
    Keywords: Aquatic angiosperm (photosynthesis) ; Bicarbonate utilization ; Egeria (photosynthesis, ultrastructure) ; Photosynthesis (leaf, stem)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Photosynthetic mechanisms have been compared in leaves and, separately, in stems of Egeria densa Planch. In order to correlate the structural and functional characteristics of the two organs (1) the ultrastructural features of leaves and stems have been studied and (2) their photosynthetic activity has been evaluated by measuring in vivo both oxygen evolution and the kinetics of chlorophyll fluorescence. The results confirm the aquatic behaviour of the leaf which is able to utilize inorganic C supplied both as CO2 and HCO 3 − . In this respect, the different wall organization found in the two cell layers of the leaf is particularly interesting, since it could be related to the known polar mechanism of inorganic-C uptake. The stem, by contrast, behaves rather as an aerial organ, needing very high CO2 concentrations in the aquatic environment in order to carry out photosynthesis. In the stem, the aerenchyma plays a role in supplying the green cells with gaseous respiratory CO2, thus facilitating the photosynthetic activity of the submerged stems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00201047
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  • 2
    Electronic Resource
    Electronic Resource
    An ultrastructural study of maize leaf etioplasts throughout their entire life-cycle (1986)
    Springer
    Protoplasma 130 (1986), S. 98-107 
    Details
    ISSN: 1615-6102
    Keywords: Zea mays L. ; Etioplasts ; Etioplast differentiation ; Etioplast senescence ; Optical diffraction ; Prolamellar body arrangement ; Prothylakoids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The entire life-cycle of maize leaf etioplasts has been followed. Prolamellar bodies with different types of tubular membrane arrangement can be found in the juvenile stages of the organelles, while in mature etioplasts nearly all the prolamellar bodies exhibit an “hexagonal ring” arrangement, which, by optical diffraction, appears to be the most regular and compact possible. The prothylakoid membranes also undergo changes during organelle differentiation, and their different organization and arrangement produce a clear dimorphism between the etioplasts of mesophyll and bundle sheath cells. In senescent etioplasts the prothylakoids are more affected, while the prolamellar bodies appear rather stable, also in situations where protochlorophyll(ide) content is very low. The formation of clusters of osmiophilic globules is coupled with the breakdown of the etioplast membranes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01276591
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of seed chilling or GA3 supply on dormancy breaking and plantlet growth in Cercis siliquastrum L. (1998)
    Springer
    Plant growth regulation 25 (1998), S. 53-61 
    Details
    ISSN: 1573-5087
    Keywords: Cercis siliquastrum ; germination ; gibberellic acid ; seed chilling ; seed dormancy ; morphogenesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Germination and post-germination events have been compared in seeds of Cercis siliquastrum whose dormancy was removed by fulfilling the natural chilling requirement or by exogenous GA3 application. Compared to the chilled ones, the GA3 treated seeds showed precocious embryo growth and an earlier reserve mobilization, which started before radicle emergence. Although the hormonal application was interrupted at seed germination, the plantlets of Cercis siliquastrum that originated from GA3-supplied seeds were taller than those from chilled ones. Moreover, they produced a greater number of leaves but a reduced root mass and had some difficulty in maintaining a good water balance. Thus, the treatment of Cercis siliquastrum seeds with exogenous GA3 broke dormancy and induced germination, but also caused long-lasting consequences on morphogenesis of the growing plantlet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005960708857
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