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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Diseases of Lily
Chastagner, G.A. ; Tuyl, J.M. van; Verbeek, M. ; Miller, William ; Westerdahl, Becky B. - \ 2017
In: Handbook of Florists' Crops Diseases, Handbook of Plant Disease Management / McGovern, R.J., Elmer, W.H., Springer International Publishing (Handbook of Plant Disease Management ) - ISBN 9783319323749 - 61 p.
Lilies (Lilium spp. and hybrids) are the second largest flower bulb crop in the Netherlands and the most important flower bulb crop in the world. They are grown for bulbs, as cut flowers, as container (potted) plants, or in gardens. Lilies are a vegetatively propagated crop and may be routinely increased by micropropagation (tissue culture) or through scaling (removal of bulb scales from which adventitious bulblets are produced). The propagules are subsequently grown in fields for 2 or 3 y to allow the bulbs to reach sufficient size (generally measured in circumference) for proper flowering and maximum horticultural quality. Although the majority of bulbs produced for worldwide distribution are grown mainly in the Netherlands, bulbs are also grown in other northern European countries, the USA, Asia, Israel, and southern hemisphere locations including Brazil, Australia, New Zealand, Tasmania, and Chile. There are a number of diseases caused by fungi, viruses, bacteria, and nematodes and physiological disorders that affect the production and quality of lily bulb and cut flower crops worldwide. Information on the distribution, epidemiology and management, of the common diseases and disorders is presented in this chapter.
Lily Perennializing in Ithaca, Louisiana and Holland
Miller, W.B. ; Kuehny, J. ; Gude, H. - \ 2010
Flower Bulb Research Program Newsletter (2010)may. - p. 1 - 9.
bolletjes en knolletjes als plantgoed - siergewassen - snijbloemen - lelies - lilium longiflorum - amerika - new york - veldgewassen - meerjarige vorm - tuinplanten - sets - ornamental crops - cut flowers - lilies - lilium longiflorum - america - new york - field crops - perennial habit - bedding plants
In May 2006, we published a newsletter (number 10) where we first reported on our experiences with multi-year flowering of a variety of “cut flower” hybrid lilies at Cornell’s outdoor trialing site, Bluegrass Lane, in Ithaca NY. In 2002-2003, we planted a range of LA, Asiatic and Oriental hybrid lilies to investigate perennialization. While not a formal trial, the 2006 newsletter showed that a range of hybrids, primarily bred for cut flower use, performed very well in outdoor garden situations in upstate New York
Hergroei van gespoelde vaste planten na export naar de VS
Dalfsen, P. van; Gude, H. ; Miller, W.B. ; Lans, A.M. van der; Dalen-Sanders, L. van - \ 2004
Lisse : Praktijkonderzoek Plant & Omgeving, Sectoren Bomen, Glastuinbouw en AGV - 27
overblijvende planten - behandeling na de oogst - mechanische schade - groei - export - vs - sierplanten - perennials - postharvest treatment - mechanical damage - growth - exports - usa - ornamental plants
Voor de export naar de VS worden vaste planten in Nederland gespoeld. Dit spoelen is bedoeld om al het zand tussen de wortels te verwijderen en gebeurt daarom vaak meerdere malen en onder hoge druk. Na inpakken, bewaren en vervoer blijken verschillende soorten vaste planten niet meer in staat de groei te hervatten, wat een forse schadepost oplevert. Oplossing van dit probleem zou de export van vaste planten naar de VS een nieuwe impuls geven. In 2001 en 2002 heeft PPO in samenwerking met Cornell University experimenten uitgevoerd, om de (fysiologische) oorzaken van de gebrekkige hergroei van gespoelde planten na export op te sporen en tegelijkertijd maatregelen ter voorkóming van het probleem te vinden. In het onderzoek zijn de volgende gewassen betrokken geweest: Delphinium elatum, Phlox paniculata ‘Windsor’, Pulmonaria saccharata ‘Mrs Moon’, Helleborus orientalis, Anemone japonica alba ‘Honorine Jobert’, Epimedium youngianum ‘Riveum’, Omphalodes cappadocica ‘Starry Eyes’, Solidago, Helenium.
Effect of low temperature on dormancy breaking and growth after planting in lily bulblets regenerated in vitro
Langens-Gerrits, M.M. ; Miller, W.B. ; Croes, A. ; Klerk, G.J.M. de - \ 2003
Plant Growth Regulation 40 (2003)3. - ISSN 0167-6903 - p. 267 - 275.
speciosum generated invitro - lilium-speciosum - germination - longiflorum - transition - storage - culture - bulbs - soil
Lilies regenerating on scale segments may develop dormancy in vitro depending on the culture conditions. The dormancy is broken by storage for several weeks at a low temperature ( 5 degreesC). The effect of the low temperature on sprouting, time of leaf emergence and further bulb growth was studied. Dormant and non-dormant bulblets were regenerated in vitro on bulb scale segments cultured at 20 degreesC or 15 degreesC, respectively. The low temperature not only affected the number of sprouted bulblets but also the time of emergence. The longer the cold storage, the faster and more uniform leaf emergence occurred. Both dormant and non-dormant bulblets grew faster after a low temperature treatment of six weeks. Thus, during dormancy breaking the tissue is prepared not only for sprouting but also for subsequent bulb growth. These processes are rather independent as low temperature stimulates growth in non-dormant bulblets whereas these bulblets sprout also without treatment at low temperature. Moreover, the hormone gibberellin induces rapid sprouting but has no influence on further bulb growth. Good growth in bulblets exposed to the low temperature coincided with production of an increased leaf weight. However, the relationship is not absolute as bulblets that were cold-treated for six weeks grew larger than bulblets cold-treated for four weeks but the formation of leaf biomass was similar. During storage at low temperature starch was hydrolyzed in the bulb scales and sugars accumulated. This indicates that during this period, preparation for later bulb growth involves mobilization of carbohydrate reserves which play a role in leaf growth and development of the photosynthetic apparatus. Starch hydrolysis proceeded in the outer scales after planting. Approximately six weeks later, the switch from source to sink took place in the bulblet, which became visible as a deposition of starch in the middle scales.
Water status and carbohydrate pools in tulip bulbs during dormancy release
Kamenetsky, R. ; Zamah, H. ; Ranwala, A.P. ; Vergeldt, F. ; Ranwala, N.K. ; Miller, W.B. ; As, H. van; Bendel, P. - \ 2003
New Phytologist 158 (2003). - ISSN 0028-646X - p. 109 - 118.
nuclear-magnetic-resonance - developmental-changes - stalk elongation - flower buds - apple buds - plants - visualization - endodormancy - spectroscopy - microscopy
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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