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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Bodemweerbaarheid verhogen: de rol van organische stof toevoegingen en het microbioom in de bodem.
Andreo Jimenez, B. ; Nijhuis, E.H. ; Schilder, M.T. ; Postma, J. - \ 2019
Gewasbescherming 50 (2019)2. - ISSN 0166-6495 - p. 54 - 54.
De landbouwsector kan efficiënter en duurzamer worden als schone organische reststoffen - van compost tot verenmeel - aan de bodem worden toegevoegd. Er zijn dan namelijk minder voedingsstoffen via kunstmest nodig. Maar het gebruik van organische materialen heeft meer voordelen: ze zijn een bron van voedsel voor het bodemleven en nuttige micro-organismen in de bodem kunnen de bodem weerbaarder maken tegen bepaalde ziekteverwekkers in gewassen. Dit vermindert de afhankelijkheid en het gebruik van chemische bestrijdingsmiddelen.
Cover crops-steered microbiome to promote suppression of soil-borne pathogens
Cazzaniga, Sara ; Braat, Lize ; Helder, J. ; Postma, J. ; Mommer, L. - \ 2019
Conventional food production is often accompanied by elevated nutrient inputs, intense pesticide applications and frequent tillage. The negative environmental implications of these practices include soil erosion and biodiversity loss. A number of promising systems are being developed to make agricultural production sustainable. Among these, cover cropping is a green and cost-efficient practice that can contribute to this goal. Cover crops are non-economic crops grown between cropping seasons to improve soil nutritional status, soil fertility and structure. Cover crops also have the potential to improve soil health by boosting microbial life.
This project is based on the hypothesis that combinations of cover crops species can promote diversity and activity of plant-beneficial soil microorganisms while deterring plant pathogens.
Therefore, we first compare the effect of individual cover crops species to that of mixtures on the soil microbiome. Furthermore, we aim to pinpoint cover crop-associated microbiomes which increase soil resilience to soil-borne pathogens.
Cover crop-associated resident (total, not necessarily active) and active fractions of microbial and metazoan communities are investigated by amplicon-based metagenomic sequencing of ribosomal DNA and RNA. Data are retrieved from a combination of field trials featuring different soil management (organic vs conventional) and controlled greenhouse experiments to allow ecologically valid results.
This project is supported by the Dutch government and sponsored by end users and cover-crop breeders. At completion, this project will provide them information allowing optimal use of cover crops, in line with the EU requirements for reduced reliance on chemical inputs.
Good root environment important for product quality. Oxygen supply in slab essential for healthy and active root system.
Heuvelink, E. ; Postma, J. - \ 2019
In Greenhouses : the international magazine for greenhouse growers 8 (2019)3. - ISSN 2215-0633 - p. 9 - 11.
Organische stof: de moeite waard voor waterbeheer?
Groenendijk, P. ; Wosten, J.H.M. ; Postma, Romke ; Ruijtenberg, R. - \ 2019
Water Matters : Kenniskatern voor Waterprofessionals - Dutch edition (2019). - p. 28 - 31.
Zijn investeringen in bodemorganische stof de moeite waard voor een
waterbeheerder? In schrale zandgronden heeft organische stof een gunstige
werking op de waterbeschikbaarheid, maar in andere gronden is het effect
Goede bodemconditie is het beste wapen tegen weersextremen
Balen, Derk van - \ 2019
Soil suppressiveness to Pythium ultimum in ten European long-term field experiments and its relation with soil parameters
Bongiorno, Giulia ; Postma, Joeke ; Bünemann, Else K. ; Brussaard, Lijbert ; Goede, Ron G.M. de; Mäder, Paul ; Tamm, Lucius ; Thuerig, Barbara - \ 2019
Soil Biology and Biochemistry 133 (2019). - ISSN 0038-0717 - p. 174 - 187.
Cress bioassay - Labile organic carbon - Pythium ultimum - Soil management effects - Soil quality parameters - Soil suppressiveness - Tillage

Soil suppressiveness to pathogens is defined as the capacity of soil to regulate soil-borne pathogens. It can be managed by agricultural practices, but the effects reported so far remain inconsistent. Soil suppressiveness is difficult to predict and for this reason different soil properties have been linked to it with the aim to find informative indicators, but these relationships are not conclusive. The objectives of this study were i) to test if soil suppressiveness is affected by long-term agricultural management such as tillage and organic matter (OM) addition; ii) to understand the direct and indirect relationships between soil suppressiveness and labile organic carbon fractions; and iii) to understand the relationship between soil suppressiveness and other chemical, physical and biological soil quality indicators. We measured soil suppressiveness with a bioassay using Pythium ultimum - Lepidium sativum (cress) as a model system. The bioassay was performed in soils from 10 European long-term field experiments (LTEs) which had as main soil management practices tillage and/or organic matter addition. We found that the site had a stronger influence on soil suppressiveness than agricultural practices. Reduced tillage had a positive effect on the suppressive capacity of the soil across sites using an overall model. Organic farming and mineral fertilization increased soil suppressiveness in some LTEs, but no overall effect of OM was found when aggregating the LTEs. Soil suppressiveness across LTEs was linked mainly to microbial biomass and labile carbon in the soil, but not to total soil organic matter content. From structural equation modelling (SEM) we conclude that labile carbon is important for the maintenance of an abundant and active soil microbial community, which is essential for the expression of soil suppressiveness. However, soil suppressiveness could only partly (25%) be explained by the soil parameters measured, suggesting that other mechanisms contribute to soil suppressiveness such as the presence and the activity of specific bacterial and fungal taxa with high biocontrol activity.

Goede bodemconditie is het beste wapen tegen weersextremen
Balen, Derk van - \ 2019
2019: veel uitdagingen voor Nederlandse pootgoedteler
Westerman, Paula - \ 2019
Kinase activity of SOBIR1 and BAK1 is required for immune signalling
Burgh, Aranka M. Van Der; Postma, Jelle ; Robatzek, Silke ; Joosten, Matthieu H.A.J. - \ 2019
Molecular Plant Pathology 20 (2019)3. - ISSN 1464-6722 - p. 410 - 422.
BAK1/SERK3 - Cf-4 - immunity - phosphorylation - RLK - RLP - SOBIR1

Leucine-rich repeat-receptor-like proteins (LRR-RLPs) and LRR-receptor-like kinases (LRR-RLKs) trigger immune signalling to promote plant resistance against pathogens. LRR-RLPs lack an intracellular kinase domain, and several of these receptors have been shown to constitutively interact with the LRR-RLK Suppressor of BIR1-1/EVERSHED (SOBIR1/EVR) to form signalling-competent receptor complexes. Ligand perception by LRR-RLPs initiates recruitment of the co-receptor BRI1-Associated Kinase 1/Somatic Embryogenesis Receptor Kinase 3 (BAK1/SERK3) to the LRR-RLP/SOBIR1 complex, thereby activating LRR-RLP-mediated immunity. We employed phosphorylation analysis of in planta-produced proteins, live cell imaging, gene silencing and co-immunoprecipitation to investigate the roles of SOBIR1 and BAK1 in immune signalling. We show that Arabidopsis thaliana (At) SOBIR1, which constitutively activates immune responses when overexpressed in planta, is highly phosphorylated. Moreover, in addition to the kinase activity of SOBIR1 itself, kinase-active BAK1 is essential for AtSOBIR1-induced constitutive immunity and for the phosphorylation of AtSOBIR1. Furthermore, the defence response triggered by the tomato LRR-RLP Cf-4 on perception of Avr4 from the extracellular pathogenic fungus Cladosporium fulvum is dependent on kinase-active BAK1. We argue that, in addition to the trans-autophosphorylation of SOBIR1, it is likely that SOBIR1 and BAK1 transphosphorylate, and thereby activate the receptor complex. The signalling-competent cell surface receptor complex subsequently activates downstream cytoplasmic signalling partners to initiate RLP-mediated immunity.

Broedsucces van kustbroedvogels in de Waddenzee in 2017
Koffijberg, Kees ; Cremer, J.S.M. ; Boer, Peter de; Nienhuis, Jeroen ; Oosterbeek, Kees ; Postma, Jelle - \ 2018
Wageningen : Wettelijke Onderzoekstaken Natuur & Milieu (WOt-technical report 136) - 38
Data have been collected on the breeding success of several characteristic coastal breeding birds in the Wadden Sea each year since 2005. Ten birds species considered representative of specific habitats and food groups are being monitored. The monitoring scheme on breeding success in coastal breeding birds is run as an ‘early warning system’ to follow the reproductive capacity of the bird populations in the Wadden Sea and understand the processes underlying fluctuations in populations. It is a valuable addition to the monitoring of population numbers and is carried out under a trilateral agreement with Germany and Denmark (TMAP). The data are also included in the OSPAR biodiversity indicator B3 under the Marine Strategy Framework Directive. The 2017 results indicate that there has been little improvement in breeding success compared with previous years and that most species, especially Eurasian Oystercatcher, Pied Avocet and Arctic Tern, raised far too few young to maintain a stable population.
Hoe planten floreren: de voordelen van gezond bodemleven in potgrond
Postma, Joeke - \ 2018

Men zegt dat we meer weten over het heelal dan over de bodem onder onze voeten. Maar gelukkig komt daar langzamerhand verandering in. In een gezonde bodem wemelt het van het leven. Er wonen kleine diertjes als wormen en pissebedden, maar ook micro-organismen als schimmels en bacteriën. Samen met de planten vormen zij een complex ecosysteem waarin alle organismen een functie hebben en elkaar ondersteunen. Potplanten staan er alleen voor, want de meeste potgrond is gesteriliseerd en bevat daardoor veel minder bodemleven. Uit onderzoek en de praktijk blijkt dat het stimuleren van bodemleven in de potgrond veel voordelen oplevert voor planten.

Wetenschap verkent biologische bodemweerbaarheid
Postma, Joeke - \ 2018

Compost en gewasresten brengen goede organische stof in de bodem en stimuleren daarmee de biologische activiteit in de bodem. Dat is goed voor de ziektewerendheid van het ecosysteem. De positieve werking voor gezonde gewasgroei is hierin aangetoond, zegt onderzoeker Joeke Postma van WUR. Maar zijn er meer mogelijkheden om de bodemweerbaarheid actief te versterken als teler?

Leidt het toevoegen van schone organische reststoffen tot een gezondere en weerbaardere bodem?
Postma, J. ; Visser, J.H.M. - \ 2018
Beter Bodembeheer
Dat is wat we onderzoeken in de publiek-private samenwerking ‘Sturen op bodemweerbaarheid door toediening van organische materialen’. De eerste resultaten van potproeven met sla- en suikerbietplanten zijn positief en bevestigen dat het toevoegen van organische reststoffen de grond inderdaad gezonder en weerbaarder maakt tegen bepaalde ziekteverwekkers. Momenteel onderzoeken we ook de mogelijkheden van deze organische stoffen in de praktijk in een veldproef met aardappels.
Disease management and suppressive soils
Postma, Joeke - \ 2018
part of Conservation Agriculture course
Management of soil suppressiveness against soil-borne diseases
Tamm, L. ; Thuerig, B. ; Bongiorno, G. ; Postma, J. ; Fuchs, J.G. ; Oberhänsli, T. - \ 2018
- 1 p.
Soils suppressive to soil-borne diseases have attracted the attention of farmers and researchers for decades and many suppressive soils have been described. Microorganisms and soil microbial communities involved in suppressiveness have been studied intensively, but the underlying mechanisms are still not well understood. Suppressiveness to soil- as well as air-borne diseases has been shown to be highly site-specific. We will review how suppressiveness can be influenced by agricultural practices. Suppressiveness destroyed e.g. by steam sterilisation of soils could only be partially restored on the short-term by re-inoculation of soils, and the success of re-inoculation depended on the soil matrix as well as on the inoculum used. Long-term management (e.g. conventional or organic management), tillage regime, and short- or long-term fertility inputs have the potential to alter soil suppressiveness, yet the effect of a particular practice is still difficult to predict. Application of biocontrol organisms such as Pseudomonads or Bacillussp. can have a beneficial effect against particular diseases on the short-term, but they can rarely persist after introduction in natural soils. Application of suitable composts can often help to sanitize fields contaminated with soil-borne pathogens more efficiently than individual biocontrol organisms. An ongoing study tries to identify key microbial consortia responsible for the beneficial effect of composts to allow a targeted application.
Successional changes in rhizosphere microbiome composition and functions during induction of the soil immune response
Gomez Exposito, R. ; Bruijn, I. de; Postma, J. ; Raaijmakers, J.M. - \ 2018
Gezonde bodem - nuttig bodemleven en beheersing bodempathogenen
Postma, J. ; Schilder, M.T. ; Visser, J.H.M. ; Molendijk, L.P.G. - \ 2018
- 1 p.
Bodemkwaliteit en bodemgezondheid.
Postma, Joeke - \ 2018
Effect van organische reststromen op bodemweerbaarheid tegen plantenziekten.
Postma, Joeke - \ 2018
Recycling van organische materialen.
Postma, Joeke - \ 2018
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