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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Auxin responsiveness of the MONOPTEROS-BODENLOS module in primary root initiation critically depends on the nuclear import kinetics of the Aux/IAA inhibitor BODENLOS
Herud, Ole ; Weijers, Dolf ; Lau, Steffen ; Jürgens, Gerd - \ 2016
The Plant Journal 85 (2016)2. - ISSN 0960-7412 - p. 269 - 277.
Arabidopsis thaliana - auxin - BODENLOS - import - IMPORTIN-ALPHA 6 - MONOPTEROS

Primary root formation in early embryogenesis of Arabidopsis thaliana is initiated with the specification of a single cell called hypophysis. This initial step requires the auxin-dependent release of the transcription factor MONOPTEROS (MP, also known as ARF5) from its inhibition by the Aux/IAA protein BODENLOS (BDL, also known as IAA12). Auxin-insensitive bdl mutant embryos and mp loss-of-function embryos fail to specify the hypophysis, giving rise to rootless seedlings. A suppressor screen of rootless bdl mutant seedlings yielded a mutation in the nuclear import receptor IMPORTIN-ALPHA 6 (IMPα6) that promoted primary root formation through rescue of the embryonic hypophysis defects, without causing additional phenotypic changes. Aux/IAA proteins are continually synthesized and degraded, which is essential for rapid transcriptional responses to changing auxin concentrations. Nuclear translocation of bdl:3×GFP was slowed down in impα6 mutants as measured by fluorescence recovery after photobleaching (FRAP) analysis, which correlated with the reduced inhibition of MP by bdl in transient expression assays in impα6 knock-down protoplasts. The MP-BDL module acts like an auxin-triggered genetic switch because MP activates its own expression as well as the expression of its inhibitor BDL. Using an established simulation model, we determined that the reduced nuclear translocation rate of BDL in impα6 mutant embryos rendered the auxin-triggered switch unstable, impairing the fast response to changes in auxin concentration. Our results suggest that the instability of the inhibitor BDL necessitates a fast nuclear uptake in order to reach the critical threshold level required for auxin responsiveness of the MP-BDL module in primary root initiation. Significance Statement Auxin triggers cell fate specification in early Arabidopsis embryogenesis through the degradation of the Aux/IAA protein BODENLOS and subsequent activation of the auxin response factor MONOPTEROS. Here, by characterizing a mutant in a nuclear import receptor, we show that rapid nuclear uptake of BODENLOS is necessary to reach the threshold required for auxin responsiveness of the MP-BDL module in primary root initiation.

Technical and economic aspects of purification strategies to minimise discharge water from companies with closed soilless cultivation systems
Os, E.A. van; Bruins, M.A. ; Beerling, E.A.M. ; Jurgens, R. ; Appelman, W. ; Enthoven, N. - \ 2014
In: International Symposium on Growing Media and Soilless Cultivation, 16 May 2014, Leiden, The Netherlands. - Leuven : ISHS - ISBN 9789462610217 - p. 125 - 132.
The aim of the research project was to achieve closure by two complementary means: 1) maximising reuse of the nutrient solution by solving problems in recircula-tion that leads to discharge, and 2) purification of the left over discharged water. In this paper the technical and economic aspects of purification strategies for single companies will be discussed. An evaluation of different techniques concluded that reverse osmosis (RO) and membrane distillation (MD) offer the best perspectives to purify the discharge water. Subsequent laboratory and onsite studies showed that ca. 80% of the discharge water can be recovered for reuse. For both technologies the water may be pre-treated with nano-filtration (NF) to increase the recovery of nutrients, and with advanced oxidation (AOP) to breakdown growth inhibition products for longer recirculation, and (in a higher dosage) to break down plant protection products in order to gain concentrate with an increased value. Based on these four technologies a range of purification strategies were formulated for which the treatment costs were estimated for two crops (rose and tomato) and two company sizes (5 and 30 ha) and three volumes of discharge (250, 500 and 1,250 m3/ha/yr). Between the two crops (rose and tomato) only little differences in costs of purification were found. Costs per ha decrease rapidly with decreasing volume of the discharge water. However, a scale advantage was found for large companies (30 ha) compared to the sector average scale of 5 ha. For the short term AOP (only reduction of plant protection products by about 80%) and reverse osmosis can be used economical. For the long term nano-filtration and membrane distillation may have prospects.
Transcriptional repression of BODENLOS by HD-ZIP transcription factor HB5 in Arabidopsis thaliana.
Smet, I. De; Lau, S. ; Ehrismann, J.S. ; Axiotis, I. ; Kolb, M. ; Kientz, M. ; Weijers, D. ; Jürgens, G. - \ 2013
Journal of Experimental Botany 64 (2013)10. - ISSN 0022-0957 - p. 3009 - 3019.
regulated gene-expression - of-function mutation - plant development - auxin response - homeobox gene - class-i - shade avoidance - root initiation - homeodomain - protein
In Arabidopsis thaliana, the phytohormone auxin is an important patterning agent during embryogenesis and post-embryonic development, exerting effects through transcriptional regulation. The main determinants of the transcriptional auxin response machinery are AUXIN RESPONSE FACTOR (ARF) transcription factors and AUXIN/INDOLE-3-ACETIC ACID (AUX/IAA) inhibitors. Although members of these two protein families are major developmental regulators, the transcriptional regulation of the genes encoding them has not been well explored. For example, apart from auxin-linked regulatory inputs, factors regulating the expression of the AUX/IAA BODENLOS (BDL)/IAA12 are not known. Here, it was shown that the HOMEODOMAIN-LEUCINE ZIPPER (HD-ZIP) transcription factor HOMEOBOX PROTEIN 5 (HB5) negatively regulates BDL expression, which may contribute to the spatial control of BDL expression. As such, HB5 and probably other class I HD-ZIP proteins, appear to modulate BDL-dependent auxin response.
Glastuinbouw Waterproof : WP5-onderzoek fase 2 (laboratorium onderzoek)
Jurgens, R. ; Appelman, W. ; Zijlstra, M. ; Creusen, R. ; Os, E.A. van - \ 2012
Apeldoorn : TNO Earth, Environmental and Life Sciences - 36
cultuur zonder grond - glastuinbouw - drainagewater - zuiveren - landbouwkundig onderzoek - kastechniek - nederland - soilless culture - greenhouse horticulture - drainage water - purification - agricultural research - greenhouse technology - netherlands
Het KRW project glastuinbouw waterproof substraatteelt kent in de uitvoering van werkpakket 5, Zuivering, 3 fases. De eerste fase betreft een studie van mogelijkheden om het spuiwater uit de kas te zuiveren. Resultaat van deze eerste fase is de selectie van 2 technieken die vervolgens in fase 2 op laboratoriumschaal getest worden. Dit rapport beschrijft in hoofdlijnen de werkzaamheden in fase 2. Resultaat van fase 2 is de selectie van techniek(en) die in fase 3 op pilotschaal getest zullen worden.
Glastuinbouw Waterproof, substraatteelt : WP5, Fase 3: pilotonderzoek membraandestillatie
Appelman, W. ; Creusen, R. ; Jurgens, R. ; Medevoort, J. van; Zijlstra, M. ; Os, E.A. van - \ 2012
Apeldoorn : TNO Earth, Environmental and Life Sciences - 29
glastuinbouw - substraten - teeltsystemen - regelingen - oppervlaktewater - oppervlaktewaterkwaliteit - emissiereductie - npk-meststoffen - genetische gewasbescherming - greenhouse horticulture - substrates - cropping systems - regulations - surface water - surface water quality - emission reduction - npk fertilizers - genetic control
Het doel van het project is de realisatie van de Kaderrichtlijn water doelen voor het oppervlaktewater in glastuinbouwgebieden door het voorkomen van de emissies van nitraat, fosfaat en gewasbeschermingsmiddelen uit substraatteelten in de glastuinbouw.
Technische en economische mogelijkheden voor het zuiveren van spuiwater
Os, E.A. van; Jurgens, R. ; Appelman, W. ; Enthoven, N. ; Bruins, M.A. ; Creusen, R. ; Feenstra, L. ; Santos Cardoso, D. ; Meeuwsen, B. ; Beerling, E.A.M. - \ 2012
Bleiswijk : Wageningen UR Glastuinbouw (Rapporten GTB 1205) - 32
drainagewater - waterzuivering - technieken - teeltsystemen - substraten - waterkwaliteit - landbouwkundig onderzoek - emissie - glastuinbouw - drainage water - water treatment - techniques - cropping systems - substrates - water quality - agricultural research - emission - greenhouse horticulture
De waterkringloop op substraatbedrijven moet verder gesloten worden. De resultaten van de diverse deelprojecten van het onderzoeksproject Glastuinbouw Waterproof-substraatteelt leiden tot mogelijkheden om de hoeveelheid spui (aantal m 3 ) naar sloot of riool te verminderen en tot apparatuur om de kwaliteit van de resterende te lozen hoeveelheid spuiwater te verbeteren (minder gewasbeschermingsmiddelen (GBM), stikstof en fosfaat). In deze rapportage wordt verslag gedaan van de technische en economische mogelijkheden van zuiveringsapparatuur om telers en beleidsmakers een (globaal) advies te kunnen geven. De belangrijkste redenen voor spui zijn ophoping van natrium, het aanwezig zijn van groeiremmende stoffen, het overlopen van opslagtanks, onbalans in de voedingsoplossing, de angst voor ziekten, weg laten lopen van de eerste drain bij de start van een teelt of gewoon de wens te willen verversen. Binnen de gewassen varieert de hoeveelheid spui sterk, van nagenoeg nul tot meer dan 1250 m 3 /ha/jaar.
Glastuinbouw Waterproof : WP5: Haalbaarheidstudie zuiveringstechnieken restant- water substraatteelt
Jurgens, R. ; Appelman, W. ; Kuipers, N. ; Feenstra, L. ; Creusen, R. ; Os, E.A. van; Bruins, M.A. ; Balendonck, J. - \ 2010
Apeldoorn : TNO Bouw en Ondergrond, Milieu en Leefomgeving - 147
glastuinbouw - substraten - teeltsystemen - siergewassen - snijbloemen - rozen - recirculatiesystemen - wateropname (planten) - ontsmettingsmiddelen - ultraviolette straling - waterstofperoxide - gewasbescherming - greenhouse horticulture - substrates - cropping systems - ornamental crops - cut flowers - roses - recirculating systems - water uptake - disinfectants - ultraviolet radiation - hydrogen peroxide - plant protection
Op een rozenbedrijf is de toepassing van geavanceerde oxidatie (combinatie van waterstofperoxide (H2O2) en UV-licht getest als methode om groeiremming bij recirculatie op te heffen. Bij goede resultaten kan het drainwater langer worden hergebruikt en vermindert de lozing van water met meststoffen en gewasbeschermingsmiddelen. In het gewas is geen groeiremming aangetoond en zijn geen groeiverschillen gemeten tussen de verschillende behandelingen (UV en H2O2/UV). Uit de proef is gebleken dat gedurende een lange periode een productief gewas kan worden geteeld zonder drainwater te hoeven lozen. Dit geldt niet voor ieder bedrijf, maar het lijkt mogelijk om de grenzen te verleggen
Korthals, Michiel - \ 2008
Onthullend bestuur: tafelen met Archimedes, Köpenick en Münchhausen
Meulen, B.M.J. van der - \ 2008
In: Grensverleggend Bestuursrecht / Addink, G.H., Jurgens, G.T.J.M., Langbroek, Ph. M., Widdershoven, R.J.G.M., Alphen aan den Rijn : Kluwer - ISBN 9789013053227 - p. 241 - 264.
Fynbos Biome
Rebelo, A.G. ; Boucher, C. ; Helme, N. ; Mucina, L. ; Rutherford, M.C. ; Smit, W.J. ; Powrie, L.W. ; Ellis, F. ; Lambrechts, J.J.N. ; Scott, L. ; Radloff, F.G.T. ; Johnson, S.D. ; Richardson, D.M. ; Ward, R.A. ; Proche, S.M. ; Oliver, E.G.H. ; Manning, J.C. ; Jürgens, N. ; McDonald, D.J. ; Janssen, J.A.M. ; Walton, B.A. ; Roux, A. le; Skowno, A.L. ; Todd, S.W. ; Hoare, D.B. - \ 2006
In: The vegetation of South Africa, Lesotho and Swaziland / Mucina, L., Rutherford, M.C., Pretoria (South Africa) : SANBI (Sterlitzia 19) - ISBN 9781919976211 - p. 52 - 219.
Apical/basal polarity : why plant cells do not stand on their heads
Friml, J. ; Benfey, P. ; Benková, E. ; Bennett, M. ; Berleth, T. ; Geldner, N. ; Grebe, M. ; Hejátko, J. ; Jürgens, G. ; Laux, T. ; Lindsey, K. ; Lukowitz, W. ; Luschnig, C. ; Offringa, R. ; Scheres, B.J.G. ; Swarup, R. ; Torres-Ruiz, R. ; Weijers, D. ; Zazímalová, E. - \ 2006
Trends in Plant Science 11 (2006)1. - ISSN 1360-1385 - p. 12 - 14.
dependent auxin gradients - arabidopsis - efflux
Auxin triggers transient, local signalling for cell specification in Arabidopsis embryogenesis.
Weijers, D. ; Schlereth, A. ; Ehrismann, J.S. ; Schwank, G. ; Kientz, M. ; Jürgens, G. - \ 2006
Developmental cell 10 (2006)2. - ISSN 1534-5807 - p. 265 - 270.
gene - monopteros - protein - embryo - expression - root - arf - transformation - movement - mutation
The Arabidopsis embryonic root meristem is initiated by the specification of a single cell, the hypophysis. This event critically requires the antagonistic auxin response regulators MONOPTEROS and BODENLOS, but their mechanism of action is unknown. We show that these proteins interact and transiently act in a small subdomain of the proembryo adjacent to the future hypophysis. Here they promote transport of auxin, which then elicits a second response in the hypophysis itself. Our results suggest that hypophysis specification is not the direct result of a primary auxin response but rather depends on cell-to-cell signaling triggered by auxin In adjacent cells
The evolutionary position of the "dragon trees" within the Dracaenaceae: evidence from non-coding chloroplast DNA sequence data
Thiede, J. ; Mies, B. ; Beyhl, F.E. ; Bos, J.J. ; Marrero, A. ; Almeida, R.S. ; Jurgens, N. - \ 2000
In: XVIth AETFAT Congress : XVIth AETFAT Congress, Meise, 28-8/ 2-9 2000 / E. Robbrecht & J. Degreef. - Brussel : [s.n.], 2000. - ISBN 90-72619-46-3 - p. 88 - 88.
Co-ordinating economic, behavioural and spatial aspects of wildlife preservation in agriculture
Wossink, G.A.A. ; Wenum, J.H. van; Jurgens, C.R. ; Snoo, G.R. de - \ 1999
European Review of Agricultural Economics 26 (1999)4. - ISSN 0165-1587 - p. 443 - 460.
This paper addresses the supply side of wildlife preservation and restoration in agriculture at the regional level. First, we show how network design modelling can be used for economic optimal spatial selection of unsprayed field margins creating a wildlife corridor in the landscape. Second, we analyse the compatibility of field margin management with farmers' perceptions by using the results of conjoint analysis in the spatial optimisation. The theoretical model is implemented by means of a GIS model and an empirical example is added to illustrate the approach.
Properties of short doughs biscuits in relation to structure
Baltsavias, A. ; Jurgens, A. ; Vliet, T. van - \ 1999
Journal of Cereal Science 29 (1999). - ISSN 0733-5210 - p. 245 - 255.
Large Deformation properties of Short Doughs : Effect of Sucrose in relation to mixing time
Baltsavias, A. ; Jurgens, A. ; Vliet, T. van - \ 1999
Journal of Cereal Science 29 (1999). - ISSN 0733-5210 - p. 43 - 48.
Fracture properties of short-dough biscuits : Effect of Composition
Baltsavias, A. ; Jurgens, A. ; Vliet, T. van - \ 1999
Journal of Cereal Science 29 (1999). - ISSN 0733-5210 - p. 235 - 244.
Rheological properties of short doughs at large deformation
Baltsavias, A. ; Jurgens, A. ; Vliet, T. van - \ 1999
Journal of Cereal Science 29 (1999)1. - ISSN 0733-5210 - p. 33 - 42.
Heuschober und Flutscheunen im Flußgebiet der Provinz Gelderland (Niederlande)
Jurgens, S.M. - \ 1997
Kulturlandschaft 7 (1997)2. - p. 77 - 80.
Amylopectine bepalend voor oudbakken worden van brood.
Keetels, C.J.A.M. ; Vliet, T. van; Jurgens, A. ; Walstra, P. - \ 1997
Voedingsmiddelentechnologie 30 (1997)21. - ISSN 0042-7934 - p. 11 - 13.
brood - chemie - zetmeel - dextrinen - glycogeen - inuline - versuikering - houdbaarheid (kwaliteit) - voeding - tarwe - bread - chemistry - starch - dextrins - glycogen - inulin - saccharification - keeping quality - nutrition - wheat
Veranderingen in de structuur van amylopectine uit de zetmeelkorrels maken het brood oudbakken. Door de Landbouwuniversiteit Wageningen werd onderzoek gedaan naar de rol van het zetmeel in het verouderingsproces
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