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.

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Seed and leaf treatments with natural compounds to induce resistance against Peronospora parasitica in Brassica oleracea
Wolf, J.M. van der; Michta, A. ; Zouwen, P.S. van der; Boer, W.J. de; Davelaar, E. ; Stevens, L.H. - \ 2012
Crop Protection 35 (2012). - ISSN 0261-2194 - p. 78 - 84.
systemic acquired-resistance - induced disease resistance - defense responses - fusarium-wilt - downy mildew - damping-off - plants - protection - cucumber - growth
Seed and leaf treatments with natural compounds having a low risk profile (LRP) were evaluated for their potential to induce resistance in cabbage plants (Brassica oleracea) against Peronospora parasitica, causal organism of downy mildew. The selection of 34 LRP compounds comprised micronutrients, organic compounds such as proline, riboflavin, oligogalacturonides, aminolignosulfonates, bacterial lipopolysaccharides, and bacterial and fungal extracts. Treatments with the synthetic chemical inducers 2,6-dichloroisonicotinic acid (INA), d,l-ß-aminobutyric acid, salicylic acid, benzothiadiazole and the fungicide Previcur™ were included as controls. After seed treatment a maximum reduction of 27% diseased leaf area was found with an extract of a Lysobacter strain, compared to a reduction of 99% for INA, the most effective synthetic inducer. Seed treatments with extracts of Pectobacterium carotovorum subsp. carotovorum, Bacillus macerans, Pseudomonas syringae, Streptomyces and Xanthomonas campestris strains also reduced downy mildew infection significantly. After leaf treatment, a maximum reduction of 85% was again found with the Lysobacter extract, compared to a reduction of 99% for INA, the most effective synthetic inducer. Leaf treatments with CuSO4 (=1 mM), MnCl2 (=10 mM), K2HPO4 (100 mM), and extracts of P. syringae, P. carotovorum subsp. carotovorum, Streptomyces, X. campestris and B. macerans strains also reduced the diseased leaf area, but CuSO4 was highly phytotoxic. For seed and leaf treatments with Lysobacter extract, proline, MnCl2 and INA the effect on the induction of chitinase and glucanase activity was tested, using two pathogenesis-related proteins as markers for induced resistance. For seed treatments only INA and for leaf treatments INA, proline and MnCl2 treatments resulted in increased activity of both enzymes. The rate of enzyme activity induced by INA was dependent on the time seeds were exposed to the compound. Highlights ¿ Seed treatments with isonicotinic acid protects Brassica seedlings from Peronospora infections. ¿ Treatments of seedlings with extracts of Lysobacter protects against Peronospora infections. ¿ Effect of seed treatments is dependent on the time of incubation with the elicitor
Fysische inductie van meeldauwresistentie in roos, Thema: Innovaties duurzame gewasbescherming BO-12.03-003.02-002
Stevens, L.H. ; Davelaar, E. ; Hofland-Zijlstra, J.D. ; Snel, J.F.H. ; Driever, S.M. - \ 2011
genetische gewasbescherming - gewasbescherming - duurzaamheid (sustainability) - teeltsystemen - meeldauw - innovaties - geïntegreerde plagenbestrijding - genetic control - plant protection - sustainability - cropping systems - mildews - innovations - integrated pest management
Informatieposter over fysische inductie van meeldauwresistentie in roos (thema: innovaties duurzame gewasbescherming). Bestaande chemische gewasbeschermingsmiddelen tegen echte meeldauw in roos worden verboden of blijken vaak onvoldoende effectief. Er is behoefte aan een nieuwe aanpak die geen registratie vereist en past in een geïntegreerd maatregelenpakket
Alternatief voedsel voor roofmijten, Thema: Innovaties duurzame gewasbescherming BO-12.03-003.02-004
Stevens, L.H. ; Davelaar, E. ; Messelink, G.J. - \ 2011
roofmijten - gewasbescherming - thrips - trialeurodes vaporariorum - plagenbestrijding - biologische bestrijding - predatory mites - plant protection - pest control - biological control
Informatieposter over alternatief voedsel voor roofmijten (thema: innovaties duurzame gewasbescherming). Succesvolle biologische beheersing van trips en wittevlieg in de Nederlandse kasteelten is afhankelijk van een vlotte en stabiele populatieopbouw van roofmijten. Om dit bij een beperkt aanbod van prooi-organismen te kunnen bewerkstelligen, is alternatief voedsel nodig waar de roofmijten naar kunnen uitwijken
Verbetering acclimatisatie geënt uitgangsmateriaal : inventarisatie van stress bij enten van glasgroenten met MIPS en vermindering uitval tijdens acclimatisatie door Graft Promotors
Snel, J. ; Stevens, L.H. ; Schoor, R. van der; Davelaar, E. ; Dijkhuis, P. ; Jalink, H. ; Krieken, W.M. van der - \ 2010
Wageningen : Plant Research International (Rapport / Plant Research International 363) - 22
tuinbouw - glastuinbouw - glasgroenten - acclimatisatie - conditionering - enten - uitselecteren - stresstolerantie - het enten (grafting) - toegepast onderzoek - horticulture - greenhouse horticulture - greenhouse vegetables - acclimatization - conditioning - scions - culling - stress tolerance - grafting - applied research
In dit project zullen met MIPS nieuwe procedures ontwikkeld worden voor het conditioneren en acclimatiseren van enten van groentengewassen. Met MIPS kunnen de effecten van conditionering en acclimatisering op groei, stress en stressgevoeligheid van de enten in de kas nauwkeurig en snel gemeten worden. Op deze wijze wordt een flink aantal conditionering/acclimatisering combinaties in relatief korte tijd geanalyseerd. Uiteindelijk zal uit deze combinaties een aantal geselecteerd worden voor evaluatie en validatie onder praktijkcondities.
Lignosulfonate compositions for control of plant pathogens
Krieken, W.M. van der; Kok, C.J. ; Stevens, L.H. ; Davelaar, E. - \ 2010
Octrooinummer: US20100068299, verleend: 2010-03-18.
The present invention relates to a composition comprising a soluble combination comprising lignosulfonate, a metal salt, and a phosphorus compound selected from the group consisting of phosphorus acid and spontaneously soluble salts thereof, and mixtures thereof. The present invention also relates to the use of such compositions as pesticide
Compositions for the control of plant pathogens and for use as plant fertilizer
Krieken, W.M. van der; Kok, C.J. ; Davelaar, E. ; Stevens, L.H. - \ 2009
Octrooinummer: WO2009082206, verleend: 2009-07-02.
The present invention relates to a composition comprising a metal compound, a lignosulfonate and phosphorous acid and/or a salt and/or a hydrate and/or an ester thereof and its use as fungicide, bactericide or fertilizer and its use in preventing the formation of a metal phosphite precipitate in an aqueous composition. The composition is preferably an aqueous composition comprising 0.1 wt.% to 40 wt.% of dry matter, calculated on the total weight of the aqueous composition. The present invention also relatesto a process for preparing the aqueous composition.
Alternatief voedsel voor roofmijten
Stevens, L.H. ; Davelaar, E. ; Messelink, G.J. - \ 2009
Biological control of Pythium aphanidermatum in cucumber with a combined application of Lysobacter enzymogenes strain 3.1T8 and chitosan
Postma, J. ; Stevens, L.H. ; Wiegers, G.L. ; Davelaar, E. ; Nijhuis, E.H. - \ 2009
Biological Control 48 (2009)3. - ISSN 1049-9644 - p. 301 - 309.
growth-promoting rhizobacteria - damping-off disease - root-rot - bacteria - plants - rhizosphere - suppression - biocontrol - rockwool - pepper
Pythium aphanidermatum (Edson) Fitzp., causing root and crown rot in cucumber, was successfully managed by Lysobacter enzymogenes strain 3.1T8. Greenhouse experiments were performed with cucumber plants grown in rockwool blocks up to 5 weeks with a recirculated nutrient solution. Application of L. enzymogenes 3.1T8 in combination with chitosan (the deacetylated derivative of chitin) reduced the number of diseased plants by 50–100% in four independent experiments relative to the Pythium control. Application of chitosan or the bacterial inoculant alone was not effective. Washed bacterial cells plus chitosan inhibited Pythium-induced disease, but the supernatant without bacterial cells combined with chitosan was not effective. The most effective and convenient type of commercially available chitosan was selected. Chitosan disappeared from the hydroponic system within 24 h after application, which we attribute to enzyme expression of L. enzymogenes 3.1T8 induced by the exposure to chitosan. Plate counts of the nutrient solution on a general bacterial medium showed the dominance of the inoculated strain, and an increased bacterial population growing on chitin and chitosan as single carbon source. The population density of L. enzymogenes 3.1T8 on the cucumber roots was investigated with a strain specific real-time TaqMan PCR. Highest chitosan concentrations applied (0.1 and 0.03 g/plant) resulted in the highest numbers of L. enzymogenes 3.1T8 present on roots; i.e. 108–109 cells/g root. Substantially higher numbers of bacterial cells were observed by scanning electron microscopy after application of chitosan; no morphological or other qualitative differences were found. The results indicate that addition of chitosan enhanced the biocontrol efficacy of L. enzymogenes 3.1T8; either chitosan serves as C- and N-source for the antagonist, induces antagonistic gene expression, or both. Keywords: Biological control; Lysobacter enzymogenes; Chitosan; Synergistic effect; Quantitative PCR; Root colonization
Duurzame bestrijding van valse meeldauw in ui
Stevens, L.H. ; Davelaar, E. ; Stoopen, G.M. ; Meier, R. ; Schepers, H.T.A.M. - \ 2009
uien - allium cepa - peronospora farinosa - pesticiden - onions - pesticides
Poster met informatie uit onderzoek naar de ontwikkeling van een effectief middel tegen valse meeldauw in ui door combinatie van componenten die qua type en toegepaste hoeveelheden nauwelijks milieu-impact hebben
Geïntegreerde bestrijding echte meeldauw bij roos
Stevens, L.H. ; Pijnakker, J. ; Davelaar, E. ; Tongeren, C.A.M. van - \ 2009
podosphaera pannosa - rosa - siergewassen - teelt onder bescherming - plantenziekteverwekkende schimmels - meeldauw - organismen ingezet bij biologische bestrijding - landbouwkundig onderzoek - glastuinbouw - gewasmonitoring - ornamental crops - protected cultivation - plant pathogenic fungi - mildews - biological control agents - agricultural research - greenhouse horticulture - crop monitoring
Poster met onderzoeksinformatie voor de bestrijding van echte meeldauw in roos (Sphaerotheca pannosa). De vraag is of aanpak van echte meeldauw met dit middel geïntegreerd kan worden met biologische bestrijding van plaaginsecten in de kasteelt
Duurzame bestrijding van loofschimmelziekten in ui
Stevens, L.H. ; Davelaar, E. ; Stoopen, G.M. ; Meier, R. ; Schepers, H.T.A.M. - \ 2008
Gewasbescherming 39 (2008)Special. - ISSN 0166-6495 - p. 45S - 46S.
gewasbescherming - tuinbouw - biologische bestrijding - geïntegreerde plagenbestrijding - toedieningswijzen - pesticiden - onkruidbestrijding - natuurlijke vijanden - analytische methoden - waterkwaliteit - innovaties - phytophthora infestans - vollegrondsteelt - bodemkwaliteit - plant protection - horticulture - biological control - integrated pest management - application methods - pesticides - weed control - natural enemies - analytical methods - water quality - innovations - outdoor cropping - soil quality
Delayed senescence in cauliflower transformed with an autoregulated isopentenyl transferase gene
Nguyen, K.H. ; Jordi, W.J.R.M. ; Dun, K. ; Schepers, F. ; Davelaar, E. ; Stoopen, G.M. ; Dix, P.J. ; Kane, E.J. - \ 2008
International Journal of Plant Sciences 169 (2008)3. - ISSN 1058-5893 - p. 339 - 347.
leaf senescence - tobacco plants - cytokinin - agrobacterium - expression - cultures
Cauliflower (Brassica oleracea var. botrytis) was transformed, using Agrobacterium tumefaciens, with an autoregulated isopentenyl transferase (ipt) gene under the control of a senescence-associated gene promoter, pSAG12, isolated from Arabidopsis thaliana. The effect of introducing this chimeric construct on cytokinin (CK) content, chlorophyll retention, and plant morphology and development were investigated. A range of CK and chlorophyll contents was found among the individual primary transformants. Progeny were studied from one of the primary transformed lines that did not have elevated cytokinin content and was phenotypically similar to the parent line but displayed delayed leaf senescence. The pSAG12:ipt gene was inherited in a Mendelian manner, and the effect of this gene on senescence-related parameters was observed in a number of the progeny. While the pSAG12:ipt progeny did exhibit delayed leaf senescence, it was accompanied by undesirable agronomic traits, including less synchronous curd initiation, smaller curd size, and greater susceptibility to fungal infection.
Duurzame bestrijding van valse meeldauw in ui
Stevens, L.H. ; Davelaar, E. ; Stoopen, G.M. ; Meier, R. ; Schepers, H.T.A.M. - \ 2007
peronospora destructor - peronospora farinosa - fungiciden - uien - allium cepa - gewasbescherming - fungicides - onions - plant protection
Poster met onderzoeksresultaten. Doel van het onderzoek is de ontwikkeling van een effectief, duurzaam, laagrisicoprofiel (LRP) fungicide
Duurzame bestrijding van valse meeldauw in ui
Stoopen, G.M. ; Stevens, L.H. ; Davelaar, E. ; Krieken, W.M. van der; Schepers, H.T.A.M. ; Meier, R. ; Baar, J. ; Olijnsma, T.W. - \ 2006
uien - allium - peronospora farinosa - ziektebestrijding - duurzaamheid (sustainability) - fungiciden - gewasbescherming - onions - disease control - sustainability - fungicides - plant protection
Onderzoek naar de ontwikkeling van een duurzaam fungicide voor de bestrijding van valse meeldauw in ui
Bewortelingsmiddelen voor de biologische landbouw
Stevens, L.H. ; Kok, C.J. ; Hok-A-Hin, C.H. ; Davelaar, E. ; Telgen, H.J. van; Eveleens-Clark, B.A. ; Derkx, M.P.M. ; Zuilichem, J.A.A. van - \ 2002
biologische landbouw - vegetatieve vermeerdering - stekken - bewortelingscapaciteit - plantengroeiregulatoren - organic farming - vegetative propagation - cuttings - rooting capacity - plant growth regulators
Poster met informatie uit onderzoek naar de ontwikkeling van een biologisch bewortelingsmiddel gebaseerd op de geïsoleerde bodembacterie Azospirillum brasilense
A potato tuber-expressed mNRA with homology to steroid dehydrogenases affects gibberellin levels and plant development
Bachem, C.W.B. ; Horvath, B.M. ; Trindade, L.M. ; Claassens, M.M.J. ; Davelaar, E. ; Jordi, W.J.R.M. ; Visser, R.G.F. - \ 2001
The Plant Journal 25 (2001). - ISSN 0960-7412 - p. 595 - 604.
gene-expression - in-vitro - abscisic-acid - cdna cloning - tuberization - biosynthesis - induction - enzymes - system - family
Using cDNA-AFLP RNA fingerprinting throughout potato tuber development, we have isolated a transcript-derived fragment (TDF511) with strong homology to plant steroid dehydrogenases. During in vitro tuberization, the abundance profile of the TDF shows close correlation to the process of tuber formation. However, when tuberization is inhibited by the addition of gibberellins (GAs) to the growth medium, the appearance of TDF511 in the fingerprint is delayed, then steadily increases in intensity during later stages of development. TDF511 was used to isolate the corresponding cDNA (CB12). The DNA and deduced amino-acid sequences of the cDNA show high homology to a fruit-ripening gene from tomato, a series of steroid dehydrogenases, and the maize Ts2 gene. A section of the cDNA was cloned in antisense orientation behind a 35S CaMV promoter and transformed into potato. Transgenic plants expressing the antisense gene showed significantly earlier emergence, an increase in height, and longer tuber shape. In vitro tuberization experiments reveal extended stolen lengths in comparison to the controls. The analysis of endogenous GA levels showed that the transgenic antisense plants have elevated levels of biologically active GAs and their respective precursors. We propose that this gene plays a role in the metabolism of plant-growth substances important for tuber life cycle and plant development.
Effects of PSAG12-IPT gene expression on development and senescence in transgenic Lettuce
McCabe, M.S. ; Garratt, L.C. ; Schepers, F. ; Jordi, W.J.R.M. ; Stoopen, G.M. ; Davelaar, E. ; Rhijn, J.H.A. van; Power, J.B. ; Davey, M.R. - \ 2001
Plant Physiology 127 (2001)2. - ISSN 0032-0889 - p. 505 - 516.
An ipt gene under control of the senescence-specific SAG12 promoter from Arabidopsis (PSAG12-IPT) significantly delayed developmental and postharvest leaf senescence in mature heads of transgenic lettuce (Lactuca sativa L. cv Evola) homozygous for the transgene. Apart from retardation of leaf senescence, mature, 60-d-old plants exhibited normal morphology with no significant differences in head diameter or fresh weight of leaves and roots. Induction of senescence by nitrogen starvation rapidly reduced total nitrogen, nitrate, and growth of transgenic and azygous (control) plants, but chlorophyll was retained in the lower (outer) leaves of transgenic plants. Harvested PSAG12-IPT heads also retained chlorophyll in their lower leaves. During later development (bolting and preflowering) of transgenic plants, the decrease in chlorophyll, total protein, and Rubisco content in leaves was abolished, resulting in a uniform distribution of these components throughout the plants. Homozygous PSAG12-IPT lettuce plants showed a slight delay in bolting (4-6 d), a severe delay in flowering (4-8 weeks), and premature senescence of their upper leaves. These changes correlated with significantly elevated concentrations of cytokinin and hexoses in the upper leaves of transgenic plants during later stages of development, implicating a relationship between cytokinin and hexose concentrations in senescence.
Quantitative determination of glycosylated and aglycon isoprenoid cytokinins at sub-picomolar levels by microcolumn liquid chromatography combined with elect
Rhijn, J.A. van; Heskamp, H.H. ; Davelaar, E. ; Jordi, W. ; Leloux, M.S. - \ 2001
Journal of Chromatography. A, Including electrophoresis and other separation methods 929 (2001). - ISSN 0021-9673 - p. 31 - 42.
Increased cytokinin levels in transgenic PSAG12-IPT tobacco plants have large direct and indirect effects on leaf senescence, photosynthesis and N partitioning
Jordi, W. ; Schapendonk, A. ; Davelaar, E. ; Stoopen, G.M. ; Pot, C.S. ; Visser, R. de; Rhijn, J.A. van; Gan, S. ; Amasino, R.M. - \ 2000
Plant, Cell & Environment 23 (2000). - ISSN 0140-7791 - p. 279 - 289.
Increased cytokinin levels in transgenic p sag12 -ipt tobacco plants have large direct and indirect effects on leaf senescence, photosynthesis and n partitioning
Jordi, W. ; Schapendonk, A. ; Davelaar, E. ; Stoopen, G.M. ; Pot, C.S. ; Visser, R. de; Rhijn, J.A. van; Gan, S. ; Amasino, R.M. - \ 1999
Plant, Cell & Environment 544 (1999). - ISSN 0140-7791 - p. 22 - 11.
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