Staff Publications

Staff Publications

  • external user (warningwarning)
  • Log in as
  • language uk
  • About

    '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.

    We have a manual that explains all the features 

    Current refinement(s):

    Records 1 - 20 / 94

    • help
    • print

      Print search results

    • export

      Export search results

    Check title to add to marked list
    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.
    Dynamics of adaptation of stomatal behaviour to moderate or high relative air humidity in Tradescantia virginiana
    Rezaei Nejad, A. ; Meeteren, U. van - \ 2008
    Journal of Experimental Botany 59 (2008)2. - ISSN 0022-0957 - p. 289 - 301.
    abscisic-acid signal - water-stress - response characteristics - cultured plantlets - aba - leaves - growth - acclimatization - invitro - co2
    Chlorophyll fluorescence imaging was used to measure stomatal closure in response to desiccation of Tradescantia virginiana leaves grown under high (90%) and moderate (55%) relative humidities (RHs), or transferred between these humidities. Stomata in leaves grown at high RH were less responsive to desiccation than those of leaves grown at moderate RH. Stomata of plants transferred from moderate RH conditions to high RH showed the same diminished closure in response to desiccation as did stomata that developed at high RH. This response was found both when the leaves were fully expanded and when still actively expanding during the moderate RH pre-treatment. Four days of exposure to high RH was the minimal exposure time to induce the diminished closure response. When leaves were grown in high RH prior to a 10 d moderate RH treatment, the reduced stomatal closure response to desiccation was only reversed in leaves (regions) which were actively expanding during moderate RH treatment. This indicates that with respect to stomatal responses to desiccation, high RH leaf regions have a limited capacity to adapt to moderate RH conditions. The decrease in responsiveness to desiccation of the stomata, induced by long-term exposure to high RH, was not due to osmotic adjustment in the leaves. Within 1 d after transferring moderate RH-grown plants to a high RH, the abscisic acid (ABA) concentration of their leaves decreased to the low level of ABA found in high RH-grown leaves. The closure response in leaves exposed to high RH for 5 d, however, could not be fully restored by the application of ABA. Transferring plants from high to moderate RH resulted in increased ABA levels within 2 d without a recovery of the stomatal closing response. It is discussed that the diminished stomatal closure in plants exposed to high RH could be due to changes in the signalling pathway for ABA-related closure of stomata or to an increased sequestration of ABA by mesophyll tissue or the symplast in the epidermis, induced by a longer period (several days) of a low ABA level.
    Carbohydrate storage and light requirements of tropical moist and dry forest tree species
    Poorter, L. ; Kitajima, K. - \ 2007
    Ecology 88 (2007)4. - ISSN 0012-9658 - p. 1000 - 1011.
    seedling survival - leaf traits - growth-rate - shade - allocation - patterns - ecology - size - acclimatization - regeneration
    In many plant communities, there is a negative interspecific correlation between relative growth rates and survival of juveniles. This negative correlation is most likely caused by a trade-off between carbon allocation to growth vs. allocation to defense and storage. Nonstructural carbohydrates (NSC) stored in stems allow plants to overcome periods of stress and should enhance survival. In order to assess how species differ in carbohydrate storage in relation to juvenile light requirements, growth, and survival, we quantified NSC concentrations and pool sizes in sapling stems of 85 woody species in moist semi-evergreen and dry deciduous tropical forests in the rainy season in Bolivia. Moist forest species averaged higher NSC concentrations than dry forest species. Carbohydrate concentrations and pool sizes decreased with the light requirements of juveniles of the species in the moist forest but not in the dry forest. Combined, these results suggest that storage is especially important for species that regenerate in persistently shady habitats, as in the understory of moist evergreen forests. For moist forest species, sapling survival rates increased with NSC concentrations and pool sizes while growth rates declined with the NSC concentrations and pool sizes. No relationships were found for dry forest species. Carbon allocation to storage contributes to the growth¿ survival trade-off through its positive effect on survival. And, a continuum in carbon storage strategies contributes to a continuum in light requirements among species. The link between storage and light requirements is especially strong in moist evergreen forest where species sort out along a light gradient, but disappears in dry deciduous forest where light is a less limiting resource and species sort out along drought and fire gradients. Key words: Bolivia; growth¿survival trade-off; shade tolerance; starch; sugar; total nonstructural carbohydrates (NSC); tropical forest.
    Water retention capacity of tissue cultured plants
    Klerk, G.J.M. de; Wijnhoven, F. - \ 2005
    Propagation of ornamental plants 5 (2005)1. - ISSN 1311-9109 - p. 14 - 18.
    micropropagated plants - abscisic-acid - acclimatization - cytokinins - shoots - growth
    Leaves rapidly close their stomata after detachment resulting in a strong reduction of water loss. It has been reported that detached leaves of in vitro produced plants show continuous water loss indicating that they are unable to close the stomata properly and/or that their cuticle is malfunctioning. We examined the water retention capacity (WRC) of detached primary leaves of in vitro germinating seedlings of Vigna radiata (mungbean). It was shown that the poor WRC was most likely due to deterioration of the stomata by the high relative humidity in the headspace. Other features of the headspace, viz., O2, CO2 and ethylene levels, did not play a significant role. Some medium additions improved the WRC somewhat, viz., paclobutrazol and abscisic acid. Other additions such as the ethylene precursor 1-aminocyclopropane-1-carboxylic acid, the ethylene blocker silverthiosulphate and cytokinin had no or a slight negative effect.
    CAMASE. Register of Agro-ecosystems Models, Version 11. CAMASE; a Concerted Action for the development and testing of quantitative methods for research on agricultural systems and the environment, March 1996
    Plentinger, M.C. ; Penning de Vries, F.W.T. - \ 2005
    Wageningen : DLO-Research Institute for Agrobiology and Soil Fertility - 420
    ecologie - gewassen - landbouw - fenologie - acclimatisatie - inventarisaties - controlelijsten - agro-ecosystemen - ecology - crops - agriculture - phenology - acclimatization - inventories - checklists - agroecosystems
    From 1995 until July 1st, 2005, the CAMASE Register of Agro-ecosystems Models was available as a searchable database on the Internet, hosted by Wageningen UR Library. This electronic-only edition of the Register contains the data present in the Register after the final update in June 1996.
    Manipulating the physiological quality of in vitro plantlets and transplants of potato
    Mehari, T. - \ 2000
    Agricultural University. Promotor(en): P.C. Struik; W.J.M. Lommen. - S.l. : S.n. - ISBN 9789058083302 - 230
    solanum tuberosum - aardappelen - in vitro kweek - microvermeerdering - zaadproductie - transplantaten - groei - groeianalyse - bladoppervlakte-index - bladoppervlakte - lichtpenetratie - ophoping van drogestof - stikstof - temperatuur - acclimatisatie - solanum tuberosum - potatoes - in vitro culture - micropropagation - seed production - transplants - growth - growth analysis - leaf area index - leaf area - light penetration - dry matter accumulation - nitrogen - temperature - acclimatization

    In vitro techniques have been introduced in potato seed production systems in recent years. This research project aimed at studying the morphological and physiological changes in plants and crops in the last three phases of a seed production system that included an in vitro multiplication, an in vitro normalisation (growing cuttings to rooted plantlets), a transplant production, and a tuber production (field) phase.

    Leaf area was identified as an important plant parameter for plant growth in the normalisation and transplant production phases. Explants and plantlets with larger initial leaf area performed better than those with smaller initial leaf area. In vitro treatments mainly affected leaf area of transplants through their effects on early above-ground leaf area. Leaf area increase was better described by logistic than by exponential or expolinear curves in all phases of growth, suggesting restriction of leaf area increase in all phases.

    Low temperature decreased leaf and stem dry weights in all phases, and increased tuber fresh and dry yields, average tuber weight, leaf/stem ratio, specific leaf area and harvest index in the tuber production phase. Growing in vitro plants at low normalisation temperatures increased leaf and total plant dry weights early in the transplant production and tuber production phases. It resulted in higher tuber yields, heavier individual tubers and higher harvest index.

    Fertilising plants with higher nitrogen (40 versus 10 mg N per plant) during transplant production resulted in plants with higher groundcover in the field. This led to higher interception of solar radiation and higher tuber yield in one of the two experiments. Growing plants at higher temperature (26/20 versus 12/18 °C) during transplant production increased leaf area at the end of the transplant production phase. After transplanting to the field, it resulted in crops with higher groundcover, which intercepted more incoming solar radiation. Yield tended to be higher, but differences could not be assessed as statistically significant. A glasshouse experiment showed that high temperature during transplant production increased leaf and stem dry weights in the tuber production phase, but reduced tuber dry weights and harvest index when temperatures during tuber production were high. Thus, high temperature during transplant production may favour haulm growth and light interception in the field, but may also reduce dry matter partitioning to tubers.

    Conditions in the tuber production phase were found to be of greater importance for final yield than conditions and treatments in earlier phases.

    Strategies to optimise the production and use of propagules and transplants should focus on achieving leafy starting material, reducing stress during changes in environment and optimising conditions during tuber production. Production of transplants should be adjusted to the expected growth conditions in the tuber production phase.

    Key words:Solanum tuberosum L., in vitro plantlet, seed production, normalisation, transplant production, tuber production, acclimatisation, leaf area, groundcover, logistic growth, temperature, nitrogen, dry matter production, specific leaf area, harvest index, radiation interception, radiation use efficiency.

    Improving and disseminating prototypes
    Vereijken, P. ; Bol, V. van; Titi, A. El - \ 1998
    Wageningen : AB-DLO (Progress reports of the research network on integrated and ecological arable farming systems for EU and associated countries 4) - 55
    alternatieve landbouw - biologische landbouw - ecologie - gewassen - landbouw - fenologie - acclimatisatie - onderzoek - geïntegreerde bedrijfssystemen - wetenschappelijk onderzoek - wetenschap - alternative farming - organic farming - ecology - crops - agriculture - phenology - acclimatization - research - integrated farming systems - scientific research - science
    Research priority setting by a stepped agro-ecological approach: case study for the Sahel of Burkina Faso
    Thiombiano, L. ; Andriesse, W. - \ 1998
    Netherlands Journal of Agricultural Science 46 (1998)1. - ISSN 0028-2928 - p. 5 - 14.
    ecologie - gewassen - landbouw - fenologie - acclimatisatie - onderzoek - burkina faso - agro-ecologie - ecology - crops - agriculture - phenology - acclimatization - research - burkina faso - agroecology
    The present study proposes a model for the identification of research issues. It includes a set of criteria to weigh the relevance of identified research projects, using an agro-ecological approach by a multidisciplinary team. In this approach, emphasis is placed on the assessment of the impact of the expected results of research projects with regard to productivity and to ecological, economical, and social sustainability. The model comprises seven steps: (1) determination of the main function(s) of a selected agro-ecological zone; (2) determination of the user-needs and indigenous knowledge; (3) determination of the constraints and potentials of the agro-ecological zone; (4) review of existing scientific knowledge and technologies; (5) identification of relevant research issues and their division over strategic and applied research; (6) prioritization and selection of themes and projects; and (7) evaluation of personnel, material and funds. A case study is presented on the sahelian zone of BurkinaFaso. Illustration of the model with this degraded area where sustainability is an actual and important issue allows a discussion on the advantages and limitations of this agro-ecological approach for research prioritization.
    Transect sampling strategies for semi-detailed characterization of inland valley systems
    Windmeijer, P.N. ; Stomph, T.J. ; Adam, A. ; Coppus, R. ; Ridder, N. de; Kandeh, M. ; Mahaman, M. ; Loon, M. van - \ 1998
    Netherlands Journal of Agricultural Science 46 (1998)1. - ISSN 0028-2928 - p. 15 - 25.
    ruimtelijke ordening - landgebruik - zonering - ecologie - gewassen - landbouw - fenologie - acclimatisatie - landevaluatie - grondvermogen - bodemgeschiktheid - west-afrika - physical planning - land use - zoning - ecology - crops - agriculture - phenology - acclimatization - land evaluation - land capability - soil suitability - west africa
    For the semi-detailed characterization of inland valleys systems in the Ivory Coast, transect sampling was used to describe valley morphology, soils, and land use characteristics. Initially, for each valley one transect with a width of 200 to 400 m was proposed. More recently, use of a larger number of transects has been suggested. However, there is no statistical basis for either the number of transects to be described or their optimal width. Two sets of aerial photographs (1979, scale 1:50 000, and 1996, scale 1:20 000) of the Boundiali key area were processed and the results digitized. Using GIS, sets of transects with different width were made, and used for the determination of the sample size for estimating the land use ratio and the valley bottom ratio at valley system level with given confidence intervals. These results were validated with data from the field and with sets of pre-selected transects. The calculated sample size is based on simple random sampling and depends on both transect width and variability in the study area. For the characterization of inland valleys with reasonable confidence intervals, the sample size for random sampling is too large for the semi-detailed characterization method. Smaller samples of transects selected on the basis of sub-recent aerial photographs gave comparable results for land cover characteristics estimation as the larger samples for random sampling. There is scope for reducing sample size by formalizing criteria for transect placement on the basis of the earlier aerial photographs.
    The economics of landscape and wildlife conservation.
    Dabbert, S. ; Dubgaard, A. ; Slangen, L.H.G. ; Whitby, M.C. - \ 1998
    Wallingford [etc.] : CAB International - ISBN 9780851992228 - 286
    natuurbescherming - landschapsbescherming - wildbescherming - flora - fauna - wild - bescherming - conservering - wildbeheer - dieren - landbouwgrond - landschap - ecologie - gewassen - landbouw - fenologie - acclimatisatie - overheidsbeleid - landbouwbeleid - agrarisch recht - investering - kosten-batenanalyse - economische evaluatie - economie - gebruikswaarde - economische impact - landen van de europese unie - nature conservation - landscape conservation - wildlife conservation - flora - fauna - wildlife - protection - conservation - wildlife management - animals - agricultural land - landscape - ecology - crops - agriculture - phenology - acclimatization - government policy - agricultural policy - agricultural law - investment - cost benefit analysis - economic evaluation - economics - use value - economic impact - european union countries
    Harvesting the sun's energy using agro-ecosystems.
    Nonhebel, S. - \ 1997
    Unknown Publisher (Quantitative approaches in systems analysis 13) - 77
    ecologie - gewassen - landbouw - fenologie - acclimatisatie - biomassa - bio-energie - planten - energie - nuttig gebruik - gebruiksefficiëntie - agro-ecosystemen - ecology - crops - agriculture - phenology - acclimatization - biomass - bioenergy - plants - energy - utilization - use efficiency - agroecosystems
    In this report, methods are developed to estimate yield potentials of biomass crops in various regions within the European Union (EU-12). Different production levels are considered; firstly, the potential production level that can be realized when the crop is optimally supplied with water and nutrients and free from pests, diseases and weeds. Secondly, the so-called water-limited production level is recognized. In the water-limited situation, nutrients are in optimal supply and the crop is free of pests, diseases and weeds, but yield is limited by the availability of water
    Ontwikkelingen in wetenschap en technologie: plantaardige productiesystemen en productie-ecologie.
    Rabbinge, R. - \ 1997
    Den Haag : Nationale Raad voor Landbouwkundig Onderzoek - ISBN 9789050590495 - 33
    landbouw - teelt - cultuurmethoden - ecologie - gewassen - fenologie - acclimatisatie - productie - capaciteit - landbouwbedrijven - bedrijfssystemen - geschiedenis - toekomst - wetenschap - agriculture - cultivation - cultural methods - ecology - crops - phenology - acclimatization - production - capacity - farms - farming systems - history - future - science
    Requirements for effective modelling strategies.
    Gaunt, J.L. ; Riley, J. ; Stein, A. ; Penning de Vries, F.W.T. - \ 1997
    Agricultural Systems 54 (1997)2. - ISSN 0308-521X - p. 153 - 168.
    fysicochemische eigenschappen - bodemeigenschappen - bodemchemie - ruimtelijke ordening - landgebruik - zonering - ecologie - gewassen - landbouw - fenologie - acclimatisatie - modellen - onderzoek - geostatistiek - physicochemical properties - soil properties - soil chemistry - physical planning - land use - zoning - ecology - crops - agriculture - phenology - acclimatization - models - research - geostatistics
    As the result of a recent BBSRC-funded workshop between soil scientists, modellers, statisticians and others to discuss issues relating to the derivation of complex environmental models, a set of modelling guidelines is presented and the required associated research areas are discussed.
    Estimates of sub-national nutrient balances as sustainability indicators for agro-ecosystems in Ecuador.
    Koning, G.H.J. de; Kop, P.J. van de; Fresco, L.O. - \ 1997
    Agriculture, Ecosystems and Environment 65 (1997). - ISSN 0167-8809 - p. 127 - 139.
    bodemchemie - anorganische verbindingen - mineralen - ecologie - gewassen - landbouw - fenologie - acclimatisatie - ruimtelijke ordening - landgebruik - zonering - ecuador - agro-ecosystemen - soil chemistry - inorganic compounds - minerals - ecology - crops - agriculture - phenology - acclimatization - physical planning - land use - zoning - ecuador - agroecosystems
    Plant domestication and evolution : a monovular twin or not?
    Raamsdonk, L.W.D. van - \ 1996
    Wageningen : CPRO-DLO - 101
    oorsprong - distributie - vestiging - wilde planten - genetica - genetische variatie - evolutie - soortvorming - immunogenetica - fylogenie - fylogenetica - relaties - gewassen - acclimatisatie - domesticatie - plantkunde - nieuwe cultuurgewassen - economische botanie - origin - distribution - establishment - wild plants - genetics - genetic variation - evolution - speciation - immunogenetics - phylogeny - phylogenetics - relationships - crops - acclimatization - domestication - botany - new crops - economic botany
    CAMASE : register of agro-ecosystems models, version 2, March, 1996
    Plentinger, M.C. ; Penning de Vries, F.W.T. - \ 1996
    Wageningen : AB-DLO - ISBN 9789073384385 - 411
    ecologie - gewassen - landbouw - fenologie - acclimatisatie - inventarisaties - controlelijsten - agro-ecosystemen - ecology - crops - agriculture - phenology - acclimatization - inventories - checklists - agroecosystems
    CAMACASE developed a comprehensive register of agro-ecosystems models, in order to: increase awareness among scientists of existing models; increase accessibility of these models; stimulate harmonization and compatibility of models; stimulate use of models
    Testing and improving prototypes
    Vereijken, P. ; Jordan, V. ; Visser, R. - \ 1996
    Wageningen : AB-DLO (Progress reports of the research network on integrated and ecological arable farming systems for EU and associated countries 3) - 69
    alternatieve landbouw - biologische landbouw - ecologie - gewassen - landbouw - fenologie - acclimatisatie - onderzoek - geïntegreerde bedrijfssystemen - wetenschappelijk onderzoek - wetenschap - alternative farming - organic farming - ecology - crops - agriculture - phenology - acclimatization - research - integrated farming systems - scientific research - science
    De zeehond terug op z'n bank; een haalbaarheidsstudie voor het Brielse Gat
    Brasseur, S.M.J.M. ; Reijnders, P.J.H. - \ 1996
    Wageningen : IBN-DLO - 31
    dieren - introductie - geïntroduceerde soorten - vrijgeven - acclimatisatie - importeren - phocidae - nederland - phoca vitulina - zuid-holland - animals - introduction - introduced species - release - acclimatization - importation - phocidae - netherlands - phoca vitulina - zuid-holland
    Efforts to accelerate domestication of winged bean (Psophocarpus tetragonolobus (L.) DC.) by means of induced mutations and tissue culture
    Klu, G.Y.P. - \ 1996
    Agricultural University. Promotor(en): E. Jacobsen; A.M. van Harten. - S.l. : Klu - ISBN 9789054856047 - 110
    oorsprong - distributie - vestiging - psophocarpus tetragonolobus - plantenveredeling - straling - geïnduceerde mutaties - weefselkweek - embryokweek - wilde planten - gewassen - acclimatisatie - domesticatie - plantkunde - nieuwe cultuurgewassen - economische botanie - origin - distribution - establishment - psophocarpus tetragonolobus - plant breeding - radiation - induced mutations - tissue culture - embryo culture - wild plants - crops - acclimatization - domestication - botany - new crops - economic botany
    This thesis describes mutation breeding and tissue culture techniques developed for accelerated domestication of winged bean ( Psophocarpustetragonolobus (L.) DC.). The tissue culture techniques, which are the first steps towards genetic transformation of the crop, include: (1) direct adventitious shoot formation from the axes of cotyledon explants; (2) direct simultaneous regeneration of adventitious shoots and somatic embryos; and (3) direct somatic embryogenesis on the wounds of cotyledon explants. An optimised mutation breeding technique for economic significance, based on the early selection of chlorophyll mutations generated from gamma-radiated seeds, has been developed. The use of this scheme has resulted in the recovery of seed coat colour mutants which have succesfully served as an indirect method for selecting changes in tannin content and nodulation. A desired mutant with reduced tannin content and improved nodulation was selected.
    The integrated transect method as a tool for land use characterisation, with special reference to inland valley agro-ecosystems in West Africa.
    Duivenbooden, N. van; Windmeijer, P.N. ; Andriesse, W. ; Fresco, L.O. - \ 1996
    Landscape and Urban Planning 34 (1996). - ISSN 0169-2046 - p. 143 - 160.
    ruimtelijke ordening - landgebruik - zonering - ecologie - gewassen - landbouw - fenologie - acclimatisatie - ivoorkust - physical planning - land use - zoning - ecology - crops - agriculture - phenology - acclimatization - cote d'ivoire
    This article contributes to the development of a general applicable method to characterise landscapes by presenting a technique to obtain data on actual land use by means of transect surveys and farmer interviews. This technique is developed as an alternative to existing ones which generate data on land use mainly as a by-product. As part of a multiscale agro-ecological characterisation methodology, the Integrated Transect Method (ITM) generates data at the semi-detailed level, and bridges gaps between disciplines, scales, and agro-ecological zones. The method is illustrated using bio-physical results from inland valley agro-ecosystems in two agro-ecological zones in Côte d'Ivoire, West Africa. So-called ‘agro-ecosystem diagrams’ offered scope for easy presentation of collected information. Additionally, various quantified land and land use characteristics were used to scale up data from the level of the transect, via inland valleys and valley systems to the level of the agro-ecological subunit. Application of ITM showed that this technique can be used effectively as a tool to analyse bio-physical differences in land use within landscapes and compare differences between them under different agro-ecological conditions. The required integration of bio-physical and socio-economic parameters, however, is the subject of further study
    Check title to add to marked list
    << previous | next >>

    Show 20 50 100 records per page

     
    Please log in to use this service. Login as Wageningen University & Research user or guest user in upper right hand corner of this page.