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  • 1
    Electronic Resource
    Electronic Resource
    Source-to-sink gradient of potassium in the phloem (1985)
    Springer
    Planta 163 (1985), S. 238-240 
    Details
    ISSN: 1432-2048
    Keywords: Assimilate transport ; Manihot ; Phloem (Kt transport) ; Potassium (phloem transport) ; Ricinus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The potassium contents of bark strips of cassava (Manihot esculenta Crantz) and of phloem exudate of castor bean (Ricinus communis L.) were analyzed at different regions of the stem. In cassava, a peak in potassium content was observed near the first mature leaf, leveling off both above and below this point. In castor bean, only a downward decreasing gradient was observed. In both plants, the direction of the potassium gradient coincided with the presumed direction of assimilate flow.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00393513
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  • 2
    Electronic Resource
    Electronic Resource
    Characterization of phloem exudation from castor-bean cotyledons (1988)
    Springer
    Planta 174 (1988), S. 380-384 
    Details
    ISSN: 1432-2048
    Keywords: Phloem loading ; Phloem sap composition ; Phloem transport ; Ricinus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Exudate was collected fromRicinus communis L. cotyledons after cutting the hypocotyl. It contained high levels of sucrose and potassium, a low level of calcium, and a pH of approx. 7.5. After application of [14C] sucrose to the cotyledons, radioactivity could be recovered from the exudate, indicating that the exudate was derived from the phloem. Using data from a number of individual seedlings, correlations between loading rates of sucrose, translocation rates, and sucrose and potassium contents were analyzed. A positive correlation was found between the rate of sucrose loading and the rate of sucrose exudation, whereas a negative correlation existed between the contents of sucrose and potassium in the phloem.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00959524
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  • 3
    Electronic Resource
    Electronic Resource
    Manipulation of tuber-size distribution of a potato crop (1990)
    Springer
    Potato research 33 (1990), S. 417-432 
    Details
    ISSN: 1871-4528
    Keywords: stolonization ; tuberization ; tuber bulking ; size grade ; stem number ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Tuber-size distribution is regulated by many diverse, interacting mechanisms and is therefore difficult to understand and manipulate. It is determined by plant density, number of stems per plant, number of tubers per stem, and yield. Seed size and plant number per unit area are easy to control, but stem number is affected by less controllable factors. Interactions between stems of different types are important for tuber-size distribution. The hormonal regulation of stolonization and tuberization is still unknown, but under the conditions of north-west Europe the process of tuber set (which is also poorly understood) makes a greater contribution to the final number of tubers than tuberization. The total yield is also relevant, because it affects both the average tuber size and its variation. Tubers on the same stem differ in timing, rate and duration of growth. The resulting hierarchy in sink strength is not consistent over time. Several mechanisms are suggested for this hierarchy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358019
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  • 4
    Electronic Resource
    Electronic Resource
    Possible mechanisms of size hierarchy among tubers on one stem of a potato (Solanum tuberosum L.) plant (1991)
    Springer
    Potato research 34 (1991), S. 187-203 
    Details
    ISSN: 1871-4528
    Keywords: size grade ; tuberization ; tuber bulking ; tuber-size distribution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The tubers on one potato stem vary greatly in size and their size distribution may be described by their number and their average size and its variation. These components are mutually and closely related. The variation is partly caused by stolon characteristics, including their date of initiation, position and size. Tuber size is therefore partly determined before tuberization. Tuber-specific factors, such as the position and activity of the tuber initial also play a role, but the date of initiation of an individual tuber is not crucial. Later on, during tuber bulking, the activity of enzymes involved in starch metabolism, the levels of hormones, the mineral composition and the turgor potential are associated with the tuber growth rate. The growth characteristics of individual tubers may also vary since they are exposed to different conditions because of differences in position or growing period.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358041
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