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  • 1
    Electronic Resource
    Electronic Resource
    Production and diurnal utilization of assimilates in leaves of spinach (Spinacia oleracea L.) and barley (Hordeum vulgare L.) (1994)
    Springer
    Planta 192 (1994), S. 497-501 
    Details
    ISSN: 1432-2048
    Keywords: Amino acid ; Hordeum (leaves) ; Phloem transport ; Photosynthesis ; Spinacia (leaves) ; Sucrose (translocation)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Rates of CO2 fixation during the light period and the rates of CO2 release during the night period were measured using mature leaves from 39- to 49-d-old spinach (Spinacia oleracea L., US Hybrid 424; grown in 9 h light, 15 h darkness, daily) and mature leaves from 21-d-old barley (Hordeum vulgare L., cv. Apex; grown in 14 h light, 10 h darkness, daily). At certain times during the light and dark periods leaves were harvested for assay of their contents of soluble carbohydrates, starch, malate and the various amino acids. Evaluation of the results of these measurements shows that in spinach and barley leaves 46% and 26%, respectively, of the carbon assimilated during the light period is deposited in the leaves for export during the night period. Taking into account the carbon consumption in the source leaves by dark respiration, it is evaluated that rates of assimilate export during the light period from spinach and barley leaves [38 and 42 μatom C · (mg Chl)−1 · h−1] are reduced in the dark period to 16 μatom C · (mg Chl)−1 · h−1 in both species. The calculated C/N ratios of the photoassimilates exported during the dark period were 0.029 and 0.015 for spinach and barley leaves, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00203587
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  • 2
    Electronic Resource
    Electronic Resource
    Subcellular volumes and metabolite concentrations in spinach leaves (1994)
    Springer
    Planta 193 (1994), S. 530-535 
    Details
    ISSN: 1432-2048
    Keywords: Amino acid ; Sucrose concentration ; Spinacia (leaf) ; Metabolite compartmentation ; Subcellular volumes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cellular and subcellular volumes in mature leaves of spinach (Spinacia oleracea L. US Hybrid 424) were determined stereologically from light and electron micrographs. Forty-nine-day-old leaves of spinach with a total leaf volume of 1177 μL per mg chlorophyll (Chl) were found to be composed of 3% epidermis, 58% mesophyll, 1% vascular tissue, 5% apoplasm and 32% gas space. In the epidermal cells 89% of the volume was occupied by the vacuole. The mesophyll cells consisted, expressed in mg·Chl−1, of 546 μL (79%) vacuole, 66 μL (9.5%) chloroplast stroma, 24 μL (34%) cytosol, 3.7 μL (0.5%) mitochondria and 2.1 μL (0.3%) nucleus. From previous measurements of the subcellular levels of sucrose, of phosphorylated intermediates of carbohydrate metabolism, of malate, oxoglutarate and various amino acids in illuminated leaves, and the above subcellular volumes, the corresponding subcellular metabolite concentrations have been determined. Of the substances measured, only with malate was the concentration higher in the vacuole than in the cytosol. The concentration of sucrose in the cytosol was 5 times, and that of amino acids even 30 times higher than in the vacuole.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02411558
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    Paper (German National Licenses)
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