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  • 1
    Electronic Resource
    Electronic Resource
    Comparison of tuber and shoot formation from in vitro cultured potato explants (1998)
    Springer
    Plant cell, tissue and organ culture 53 (1998), S. 197-204 
    Details
    ISSN: 1573-5044
    Keywords: Solanaceae ; Solanum tuberosum ; sugar metabolism ; tuberization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The development of axillary buds of potato (Solanum tuberosum L.) plants, cultured in vitro, was analyzed. Depending on the composition of the culture medium, the buds developed into either tubers (medium with 8% sucrose), shoots (1% sucrose), or stolons (8% sucrose and 0.5 μM gibberellin). Endogenous sugar and starch levels, and key-enzymes involved in the conversion of sucrose to starch were determined at different stages of development. Moreover, the spatial distribution of sugar levels and enzyme activities were determined within the developing structures. Glucose and fructose decreased upon tuber formation, most noticeably in the swelling parts, where also starch accumulated. The activities of sucrose synthase, fructokinase and ADP-glucose pyrophosphorylase were highest under tuber-inducing conditions, the increase being confined to the tubers, and absent in the subtending stolons. It is concluded that changes in the measured parameters, observed under tuberizing conditions, are specifically related to the formation of the tuber, and are confined to the swelling part only.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006019208758
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  • 2
    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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  • 3
    Electronic Resource
    Electronic Resource
    Physiological and genetic control of tuber formation (1999)
    Springer
    Potato research 42 (1999), S. 313-331 
    Details
    ISSN: 1871-4528
    Keywords: tuberization ; stolon formation ; hormones ; morphological changes ; gibberellins ; QTL mapping ; fingerpringting ; carbohydrate metabolism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Tuber formation is a plalstic and complex, but well-orchestrated sequences of morphological. physiological and biochemical events. The physiological control mechanisms of this sequence of events may involve many hormones, but certainly gibberellic acids play a dominant role: they affecft most steps and are influenced by inducing or non-inducing conditions in a manner consistent with effects of these conditions on tuber induction. The genetic control is also complex. Numerous cDNA fragments have been isolated which are specifically expressed during tuberization. They can be used in anti-sense orientation in transgenic plants to thest their possible role in tuberization. In addition these cDNA fragments are used as genetic marker loci in QTL mapping studies and serve as candidate genes to exlain phenotypic variation. Profiles of the importance of QTLs over time may be combined with expression profiles of candidate genes. Such novel approaches offer unique opportunities for synergism between physiology, molecular biology and genetics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02357860
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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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