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  • 1
    Electronic Resource
    Electronic Resource
    Gibberellins and tuberization in potato (1999)
    Springer
    Potato research 42 (1999), S. 471-481 
    Details
    ISSN: 1871-4528
    Keywords: Solanum tuberosum ; S. andigena ; S. demissum ; hormones ; regulation ; starch accumulation ; tuber formation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The evidence for a role of gibberellins in the regulation of potato tuber formation is reviewed. Endogenous gibberellin levels in plants are high under non-inducing conditions and decrease under inducing conditions. Exogenously applied gibberellins inhibit tuber formation, whereas applying inhibitors of gibberellin biosynthesis has the opposite effect. Cellular events involved in tuberization, viz., cell division, cell enlargement and orientation of micro-tubules, are also reviewed. Based on available evidence, a major regulatory role of gibberellins is suggested. However, it is also argued that tuber formation is not simply regulated by gibberellins acting as the sole signal between above-ground and below-ground parts, since stolon tips are able to synthesize their own gibberellins, and the phenotype of phytochrome B-antisense plants cannot be explained only by altered levels of GAs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358163
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  • 2
    Electronic Resource
    Electronic Resource
    Is dormancy breaking of potato tubers the reverse of tuber initiation? (2000)
    Springer
    Potato research 43 (2000), S. 347-369 
    Details
    ISSN: 1871-4528
    Keywords: hormones ; carbohydrate metabolism ; sprouting ; Solanum tuberosum L
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Tuber formation is a well orchestrated physiological event that involves many metabolic changes. Dormancy gradually develops in potato tubers from the moment cell division in the stolon tip has stopped and the tuber starts to develop. Dormancy breakage may be the reverse of dormancy initiation suggesting that there may be similarities between tuber induction and dormancy development. Based on a literature review it is concluded that, when comparing tuber induction and the breaking of dormancy, hormonal activities are only partly reversed, whereas carbohydrates and enzyme activities might be reversed. For more definite conclusions more research should be done to assess precisely the moment of dormancy breaking. Moreover, measurements on events associated with tuber induction and dormancy breaking should be carried out using the same techniques and the same material. Molecular genetic analyses may provide well-defined markers for the timing of breaking of dormancy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02360540
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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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