Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 320217
Title Water status and carbohydrate pools in tulip bulbs during dormancy release
Author(s) Kamenetsky, R.; Zamah, H.; Ranwala, A.P.; Vergeldt, F.; Ranwala, N.K.; Miller, W.B.; As, H. van; Bendel, P.
Source New Phytologist 158 (2003). - ISSN 0028-646X - p. 109 - 118.
DOI https://doi.org/10.1046/j.1469-8137.2003.00719.x
Department(s) Biophysics
EPS-3
Publication type Refereed Article in a scientific journal
Publication year 2003
Keyword(s) nuclear-magnetic-resonance - developmental-changes - stalk elongation - flower buds - apple buds - plants - visualization - endodormancy - spectroscopy - microscopy
Abstract Changes in the physical state of cellular water and its interrelations with carbohydrate metabolism were studied during preplanting storage of tulip bulbs (Tulipa gesneriana 'Apeldoorn'). Magnetic resonance imaging, light and scanning electron microscopy and high-performance anion exchange chromatography with pulsed amperometric detection were used to follow time-dependent changes during bulb storage at 17 or 20degreesC (nonchilled) or 4degreesC (chilled). No visible differences in scale structure and central bud development were observed microscopically between chilled and nonchilled bulbs. However, the scales of the chilled bulbs exhibited higher water content, faster starch degradation and increased concentrations of sucrose and ethanol-soluble fructan. Quantitative measurements of magnetization transfer (MT) indicated a smaller fraction of a solid or a restricted-mobility proton pool in the scales of the chilled bulbs. By contrast, the MT effect was significantly higher in the central bud of the chilled than in the nonchilled bulbs. Degradation of storage polysaccharides to low-molecular-weight sugar molecules during release from dormancy could be accompanied by local release of water molecules tightly bound to the polysaccharide granules into the bulk water, or by an influx of free water molecules due to increased osmotic potential caused by the raised sugar concentration, or by a combination of both effects.
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