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  • 1
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Eukaryotic cells use multiple, highly conserved mechanisms to contend with ultraviolet-light-induced DNA damage. One important response mechanism is transcription-coupled repair (TCR), during which DNA lesions in the transcribed strand of an active gene are repaired much faster than in the ...
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1871-4528
    Keywords: seed tuber weight ; relationships ; model ; density ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The number of stems per seed tuber produced by 17 seed stocks of cv. Record was determined in glasshouse and field experiments to assess the feasibility of predicting the number of stems produced in the field. Multiple regression analysis showed that seed tuber weight alone gave the most satisfactory fit to stems produced in the field, which was not improved by adding terms involving the number of stems produced in the glasshouse. Quadratic relationships between the number of above-ground stems per tuber and tuber weight were most appropriate for each stock, with the fitted curves for individual stocks differing only in the constant term. However, there were significant rank correlation coefficients between the constant terms for relationships between field stems and tuber weight and glasshouse stems and tuber weight, suggesting that in other cultivars and seed stocks a predictive glasshouse test might still be useful.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1871-4528
    Keywords: coefficient of variation ; numbers of tubers ; uniformity ; Solanum tuberosum L
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Using data from a wide range of experiments, the effects of some agronomic factors on the variability of the tuber size distribution were calculated. The factors studied were nitrogen (N), phosphorus (P), potassium (K), seed-tuber planting density, physiological age, date of harvest, seed-tuber weight, irrigation, cultivar and site of production. There were significant effects of N, date of harvest, cultivar and site of production on the variability of the tuber size distribution measured as the coefficient of variation (CV) of tuber size. The CV increased with higher levels of aplied N and with later harvesting. The largest effect, but one that was unquantifiable, was that of site of production. These results demonstrate that the uniformity of tuber size distribution can vary and suggest that work to understand the reasons for this would be valuable.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1871-4528
    Keywords: light ; temperature ; stolon growth medium ; below ground nodes ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Five experiments studied the effects of shading, temperature and stolon growth medium on stolon and tuber formation. The lowest numbers of stolons and tubers were produced at the higher and lower nodes. Numbers of primary stolons and tubers were relatively stable across nodes and treatments and variation in total numbers was largely due to changes in numbers of lateral and branch stolons. In the field, 70% shading reduced numbers of stolons and tubers by reducing lateral and branch stolons, while in hydroponics, 45% shading and temperatures at initiation had no effect on tuber numbers. In both environments later planting tended to reduce numbers of stolons and tubers. There were large effects of the physical environment, with compost producing three times as many tubers as dry vermiculite. The potential number of tubers may be determined by the number of stolons and the environmental conditions affecting stolon formation and development.
    Type of Medium: Electronic Resource
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