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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The ROSEA1 and DELILA transcription factors control anthocyanin biosynthesis in Nicotiana benthamiana and Lilium flowers
Fatihah, Hasan N.N. ; Moñino López, Daniel ; Arkel, Gert van; Schaart, Jan G. ; Visser, Richard G.F. ; Krens, Frans A. - \ 2019
Scientia Horticulturae 243 (2019). - ISSN 0304-4238 - p. 327 - 337.
Anthocyanin - Flower specific promoter - Lilium spp. - N. benthamiana - Transcription factors

The activity of anthocyanin biosynthesis genes is regulated at the transcriptional level, thus manipulation of transcription factors (TFs) is an ideal strategy to alter the expression of multiple target genes. In this study, we investigated the effect of introducing ROSEA1 (ROS1, a MYB-type) and DELILA (DEL, a bHLH-type) TFs from snapdragon under control of a flower specific promoter, Floral Binding Protein 1 (FBP1) from petunia into Nicotiana benthamiana flowers and Lilium tepals. The usefulness of the FBP1 promoter was demonstrated by the generation of purplish flowers in otherwise normal-growing plants of N. benthamiana, while the expression by the 35S promoter led to the development of stunted plants with anthocyanins in all parts. N. benthamiana was successfully transformed by ROS1 alone and by a combination of ROS1 + DEL. The observed accumulation of delphinidin corresponded to the expression of NbCHS, NbF3H, NbDFR and NbANS. The effect of ROS1 + DEL on Lilium flower colour was investigated using agroinfiltration. A higher cyanidin accumulation was observed in tepals of the Oriental hybrid lily cv. ‘Perth’ resulting in deeper pink colouration at the infiltrated area. Nevertheless, the introduction of ROS1 + DEL did not produce any phenotypic changes to the white-flowered L. longiflorum cv. ‘Lincoln’ and the white Oriental hybrid lily cv. ‘Rialto’ due to other deficiencies in their anthocyanin biosynthetic pathway. Co-expression of ROS1 + DEL under control of the FBP1 promoter together with active structural anthocyanin biosynthetic genes can result in modification of Lilium flower colour.

Betekenis van greppel plas-dras als habitat voor weidevogelkuikens
Visser, Tim ; Melman, T.C.P. - \ 2018
De Levende Natuur 119 (2018)3. - ISSN 0024-1520 - p. 114 - 118.
Ontwatering in de agrarische bedrijfsvoering is één van de grootste hinderpalen voor het habitat van weidevogels. Zou het op kleine schaal creëren van vochtige/natte omstandigheden hiervoor een oplossing kunnen zijn, bijvoorbeeld in de vorm van ‘greppel plas-dras’. Dit artikel beschrijft de resultaten van onderzoek in de Eempolders naar het effect van greppel plas-dras op de kwaliteit van het grasland als foerageerhabitat voor weidevogelkuikens, aan de hand van de biomassa, openheid (doorwaadbaarheid) en structuurvariatie van de vegetatie, de insectenrijkdom en de mate waarin weidevogelgezinnen gebruik maken van percelen met een greppel plas-dras.
Resistance to tomato yellow leaf curl virus in tomato germplasm
Yan, Zhe ; Pérez-de-Castro, Ana ; Díez, Maria J. ; Hutton, Samuel F. ; Visser, Richard G.F. ; Wolters, Anne-Marie A. ; Bai, Yuling ; Li, Junming - \ 2018
Frontiers in Plant Science 9 (2018). - ISSN 1664-462X
Begomovirus - Resistance - S. chilense - S. peruvianum - Solanum lycopersicum - Tomato - TYLCV

Tomato yellow leaf curl virus (TYLCV) is a virus species causing epidemics in tomato (Solanum lycopersicum) worldwide. Many efforts have been focused on identification of resistance sources by screening wild tomato species. In many cases, the accession numbers were either not provided in publications or not provided in a consistent manner, which led to redundant screenings. In the current study, we summarized efforts on the screenings of wild tomato species for TYLCV resistance from various publications. In addition, we screened 708 accessions from 13 wild tomato species using different inoculation assays (i.e., whitefly natural infection and Agrobacterium-mediated inoculation) from which 138 accessions exhibited no tomato yellow leaf curl disease (TYLCD) symptoms. These symptomless accessions include 14 accessions from S. arcanum, 43 from S. chilense, 1 from S. chmielewskii, 28 from S. corneliomulleri, 5 from S. habrochaites, 4 from S. huaylasense, 2 from S. neorickii, 1 from S. pennellii, 39 from S. peruvianum, and 1 from S. pimpinellifolium. Most of the screened S. chilense accessions remained symptomless. Many symptomless accessions were also identified in S. arcanum, S. corneliomulleri, and S. peruvianum. A large number of S. pimpinellifolium accessions were screened. However, almost all of the tested accessions showed TYLCD symptoms. Further, we studied allelic variation of the Ty-1/Ty-3 gene in few S. chilense accessions by applying virus-induced gene silencing and allele mining, leading to identification of a number of allele-specific polymorphisms. Taken together, we present a comprehensive overview on TYLCV resistance and susceptibility in wild tomato germplasm, and demonstrate how to study allelic variants of the cloned Ty-genes in TYLCV-resistant accessions.

Groenbemesters na aardappelen zinvol
Molendijk, Leendert ; Visser, Johnny - \ 2018
Association between Preoperative Vitamin D Status and Short-Term Physical Performance after Total Hip Arthroplasty : A Prospective Study
Visser, Edith ; Roos, Nicole M. de; Oosting, Ellen ; Endenburg, Silvia C. ; Dronkers, Jaap J. - \ 2018
Annals of Nutrition & Metabolism (2018). - ISSN 0250-6807 - p. 252 - 260.

Background: Insufficient serum vitamin D concentrations (50-75 nmol/L) are prevalent in 40-65% of patients who require total hip arthroplasty (THA). This could impair physical recovery after surgery. This study investigated the association between preoperative vitamin D status and physical performance after THA. Additionally, postoperative changes in vitamin D concentrations were measured. Methods: We included 87 patients scheduled for elective THA and aged ≥65 years. Three groups were recruited: patients classified as vitamin D deficient (< 50 nmol/L, n = 23), insufficient (50-75 nmol/L, n = 32), or sufficient (> 75 nmol/L, n = 32). Serum 25-hydroxyvitamin D3 (25[OH]D3) concentration and physical performance were measured perioperatively. Linear mixed models were used to examine differences between groups. Results: Change in physical performance over time was not affected by preoperative vitamin D status. In contrast, for physical activity, both vitamin D (p = 0.021) and time (p < 0.001) effect was seen: from 80.2 ± 25.8 to 58.1 ± 17.8 min/day in the deficient group, 143.7 ± 19.8 to 92.9 ± 11.5 min/day in the insufficient group, and 108.1 ± 20.9 to 62.3 ± 12.9 min/day in the sufficient group. The Chair Stand Test, Timed Up and Go test, and 10-Meter Walking Test also improved significantly over time, but independent of vitamin D status. An increase in 25(OH)D3 concentration 6 weeks postoperatively was correlated with improved hip function (Pearson's r = -0.471, p = 0.018). Overall, serum 25(OH)D3 declined with 32% one day after surgery (p < 0.001), to nearly return to baseline values 6 weeks later in all groups. Conclusion: Vitamin D status did not appear to affect physical recovery after THA. The drop in vitamin D after surgery deserves further investigation, but could possibly be explained by hemodilution.

Rapportage aanvullende werkzaamheden op WOt-technical report 107: “Natuurcombinaties en Europese natuurdoelen”
Melman, T.C.P. ; Visser, Tim ; Meeuwsen, H.A.M. - \ 2018
WOT Natuur & Milieu (WOt-interne notitie 221) - 48 p.
Voedsel van de Wereld: Rijst
Visser, Richard - \ 2018

Vier gewassen hebben de wereld veroverd: rijst, tarwe, mais en aardappelen. Een serie over het dagelijks eten van zeven miljard mensen. Deel 1: Rijst

Genetic diversity and mechanisms of salt tolerance of Miscanthus
Chen, Chang-Lin - \ 2018
University. Promotor(en): Richard Visser, co-promotor(en): Gerard van der Linden. - Wageningen : Wageningen University - ISBN 9789463433228 - 198
EU Court casts new plant breeding techniques into regulatory limbo
Purnhagen, K. ; Kok, E.J. ; Kleter, G.A. ; Schebesta, H. ; Visser, R.G.F. ; Wesseler, J.H.H. - \ 2018
Nature Biotechnology 36 (2018)9. - ISSN 1087-0156 - p. 799 - 800.
The utility of fitness landscapes and big data for predicting evolution
Visser, J.A.G.M. de; Elena, Santiago F. ; Fragata, Inês ; Matuszewski, Sebastian - \ 2018
Heredity (2018). - ISSN 0018-067X
Plantkampioen luchtzuivering binnenruimtes : Eindrapport
Visser, Pieter de; Meinen, Esther - \ 2018
Wageningen : Wageningen University & Research, BU Glastuinbouw (Rapport WPR 812) - 38
Within the project ‘Plant champion air purification’, a public-private cooperation within Topsector Horticulture and Starting materials, research was carried out by Wageningen University & Research BU Greenhouse Horticulture on the possibilities of plants to purify indoor contaminated air. In this report the experimental findings are reported. The general conclusion is that plants can effectively remove Volatile Organic Compounds (VOCs) without causing plant injury. Formaldehyde is research being a typical hydrophilic VOC, for the ornamental plants Ficus, Spathiphyllum, Sansevieria en Cyperus. Ficus is the fastest in removing formaldehyde from the air by its aboveground leaves. Incorporating also the substrate, then Cyperus is the fastest. It was shown that the presence of water in air and/or substrate is a key factor in the rate of formaldehyde depletion. The second VOC examined was the lipophylic xylene which followed an uptake pathway other than formaldehyde. In the experiments it was shown that xylene was adsorbed to the leaf only temporarily, and was again mostly reemitted when brought into clean air. Possibly the substrate is of bigger importance then the plant in removing xylene and other lipophilic VOC, as was also stated in literature. The research shows that plants clearly have the potential to purify the indoor air from VOC.
Development of an in vitro protocol to screen Clavibacter michiganensis subsp. michiganensis pathogenicity in different Solanum species.
Mohd Nadzir, M.M. ; Vieira Lelis, Flavia ; Thapa, B. ; Ali, Afrida ; Visser, R.G.F. ; Heusden, A.W. van; Wolf, J.M. van der - \ 2018
Plant Pathology (2018). - ISSN 0032-0862
Clavibacter - Cmm - disease screening - in vitro - PathoScreen - tomato
Clavibacter michiganensis subsp. michiganensis (Cmm) is a quarantine organism in Europe and in many other countries. It is one of the most severe bacterial pathogens affecting tomato. Screening tomato plants for their resistance level
to Cmm requires a large amount of space under quarantine conditions and is therefore costly. This project developed a new inoculation protocol on in vitro tomato plants to facilitate a more economic and higher throughput disease screening. A new method using the PathoScreen system was tested to localize green fluorescent protein-tagged Cmm in planta and to quantify the pathogen based on the percentage of corrected GFP (cGFP%). The system was sensitive in detecting the GFP-tagged Cmm in the shoots, but in the roots a high autofluorescence masked detection and thus sensitivity of the assay. The in vitro protocol was tested on several wild relatives of tomato, which were previously screened in a greenhouse assay. The correlation between wilt symptoms in vitro and wilt symptoms in the greenhouse was overall moderate (r = 0.6462). The protocol worked well in differentiating the two parents that were used in the mapping studies. This study shows that the in vitro protocol can be efficiently used for resistance breeding in many tomato genotypes.
Perceptions of Dutch health care professionals on weight gain during chemotherapy in women with breast cancer
Kruif, J.Th.C.M. de; Scholtens, M.B. ; Rijt, J. van der; Boer, M.R. de; Berg, M.M.G.A. van den; Vries, Y.C. de; Winkels, R.M. ; Visser, M. ; Kampman, E. ; Westerman, M.J. - \ 2018
Supportive Care in Cancer (2018). - ISSN 0941-4355 - 7 p.
Breast cancer - Dietary intake - Health care professionals - Health risks - Physical activity - Weight gain

Purpose: Dutch Health care professionals (HCPs) provide little information concerning health risks associated with weight gain during chemotherapy for breast cancer. Women with breast cancer have specified the need for more information on nutrition and physical activity to deal with weight gain. The aims of this study were to assess the perceptions of Dutch HCPs on weight gain during chemotherapy and in addition evaluate whether and what kind of information on dietary intake and physical activity HCPs provide to prevent/treat weight gain during (neo)adjuvant chemotherapy. Methods: A qualitative study was conducted using semi-structured interviews with 34 HCPs involved in breast cancer care: general practitioners, oncologists, specialized nurses, and dieticians. Results: To date, little information about nutrition, physical activity, and weight gain is given during chemotherapy because it is not part of most HCPs’ training, it is not included in the guidelines and it is not the best time to bring up information in the opinion of HCPs. Weight gain was perceived as just a matter of a few kilos and not an important health issue during treatment. All HCPs felt it is better that women themselves addressed their weight gain after chemotherapy. Conclusion: More knowledge about health risks associated with chemotherapy-induced weight gain and how to combat these issues needs to be made readily available to the HCPs and should become part of their training. Existing patient guidelines should include information on how to prevent and/or reduce weight gain through self-management of nutrition intake and physical activity during and post chemotherapy.

Ant-like Traits in Wingless Parasitoids Repel Attack from Wolf Spiders
Harvey, Jeffrey A. ; Visser, Bertanne ; Lammers, Marl ; Marien, Janine ; Gershenzon, Jonathan ; Ode, Paul J. ; Heinen, Robin ; Gols, Rieta ; Ellers, Jacintha - \ 2018
Journal of Chemical Ecology 44 (2018)10. - ISSN 0098-0331 - p. 894 - 904.
Batesian mimicry; Müllerian mimicry - Chemical defense - Formica - Gelis - Hymenoptera - Lasius - Predation

A recent study showed that a wingless parasitoid, Gelis agilis, exhibits a suite of ant-like traits that repels attack from wolf spiders. When agitated, G. agilis secreted 6-methyl-5-hepten-2-one (sulcatone), which a small number of ant species produce as an alarm/panic pheromone. Here, we tested four Gelis parasitoid species, occurring in the same food chain and microhabitats, for the presence of sulcatone and conducted two-species choice bioassays with wolf spiders to determine their degree of susceptibility to attack. All four Gelis species, including both winged and wingless species, produced sulcatone, whereas a closely related species, Acrolyta nens, and the more distantly related Cotesia glomerata, did not. In two-choice bioassays, spiders overwhelmingly rejected the wingless Gelis species, preferring A. nens and C. glomerata. However, spiders exhibited no preference for either A. nens or G. areator, both of which are winged. Wingless gelines exhibited several ant-like traits, perhaps accounting for the reluctance of spiders to attack them. On the other hand, despite producing sulcatone, the winged G. areator more closely resembles other winged cryptines like A. nens, making it harder for spiders to distinguish between these two species. C. glomerata was also preferred by spiders over A. nens, suggesting that other non-sulcatone producing cryptines nevertheless possess traits that make them less attractive as prey. Phylogenetic reconstruction of the Cryptinae reveals that G. hortensis and G. proximus are ‘sister’species, with G. agilis, and G.areator in particular evolving along more distant trajectories. We discuss the possibility that wingless Gelis species have evolved a suite of ant-like traits as a form, of mimicry to repel predators on the ground.

Effectiveness of nutritional interventions in older adults at risk of malnutrition across different health care settings : Pooled analyses of individual participant data from nine randomized controlled trials
Reinders, Ilse ; Volkert, Dorothee ; Groot, Lisette C.P.G.M. de; Beck, Anne Marie ; Feldblum, Ilana ; Jobse, Inken ; Neelemaat, Floor ; Schueren, Marian A.E. de van der; Shahar, Danit R. ; Smeets, Ellen T.H.C. ; Tieland, Michael ; Twisk, Jos W.R. ; Wijnhoven, Hanneke A.H. ; Visser, Marjolein - \ 2018
Clinical Nutrition (2018). - ISSN 0261-5614
Dietary counseling - Oral nutritional supplements - Protein-energy malnutrition - Undernutrition - Weight gain

Background & aims: Protein-energy malnutrition is a health concern among older adults. Improving nutritional status by increasing energy and protein intake likely benefits health. We therefore aimed to investigate effects of nutritional interventions in older adults (at risk of malnutrition) on change in energy intake and body weight, and explore if the intervention effect was modified by study or participants’ characteristics, analysing pooled individual participant data. Methods: We searched for RCTs investigating the effect of dietary counseling, oral nutritional supplements (ONS) or both on energy intake and weight. Principle investigators of eligible studies provided individual participant data. We investigated the effect of nutritional intervention on meaningful increase in energy intake (>250 kcal/day) and meaningful weight gain (>1.0 kg). Logistic generalized estimating equations were performed and ORs with 95% CIs presented. Results: We included data of nine studies with a total of 990 participants, aged 79.2 ± 8.2 years, 64.5% women and mean baseline BMI 23.9 ± 4.7 kg/m2. An non-significant intervention effect was observed for increase in energy intake (OR:1.59; 95% CI 0.95, 2.66) and a significant intervention effect for weight gain (OR:1.58; 95% CI 1.16, 2.17). Stratifying by type of intervention, an intervention effect on increase in energy intake was only observed for dietary counseling in combination with ONS (OR:2.28; 95% CI 1.90, 2.73). The intervention effect on increase in energy intake was greater for women, older participants, and those with lower BMI. Regarding weight gain, an intervention effect was observed for dietary counseling (OR:1.40; 95% CI 1.14, 1.73) and dietary counseling in combination with ONS (OR:2.48; 95% CI 1.92, 3.31). The intervention effect on weight gain was not influenced by participants’ characteristics. Conclusions: Based on pooled data of older adults (at risk of malnutrition), nutritional interventions have a positive effect on energy intake and body weight. Dietary counseling combined with ONS is the most effective intervention.

Energy and Protein Intake of Alzheimer's Disease Patients Compared to Cognitively Normal Controls : Systematic Review
Doorduijn, Astrid S. ; Rest, Ondine van de; Flier, Wiesje M. van der; Visser, Marjolein ; Schueren, Marian A.E. de van der - \ 2018
Journal of the American Medical Directors Association (2018). - ISSN 1525-8610
malnutrition - mild cognitive impairment - Older adults

Objectives: Protein and energy malnutrition and unintended weight loss are frequently reported in patients with mild cognitive impairment (MCI) and Alzheimer's disease (AD). Possible underlying mechanisms include increased energy expenditure, altered uptake of nutrients, a reduced nutritional intake, or a combination of these 3. We aimed at systematically reviewing the literature to examine potential differences in energy and protein intake in patients with MCI and AD compared to controls as a possible mechanism for unintended weight loss. Design: Systematic review and meta-analysis. Setting: PubMed and Cochrane Electronic databases were searched from inception to September 2017 for case control studies. Participants: Patients with MCI or AD compared to cognitive healthy controls, all adhering to a Western dietary pattern. Measurements: Energy and protein intake. Results: The search resulted in 7 articles on patients with AD versus controls, and none on patients with MCI. Four articles found no differences in energy and protein intakes, 1 found higher intakes in patients with AD, and 1 article found lower intakes in patients with AD compared to controls. One article reported on intakes, but did not test differences. A meta-analysis of the results indicated no difference between patients with AD and controls in energy [−8 kcal/d, 95% confidence interval (CI): −97, 81; P = .85], or protein intake (2 g/d, 95% CI: −4, 9; P = .47). However, heterogeneity was high (I2 > 70%), and study methodology was generally poor or moderate. Conclusion: Contrary to frequently reported unintended weight loss, our systematic review does not provide evidence for a lower energy or protein intake in patients with AD compared to controls. High heterogeneity of the results as well as of participant characteristics, setting, and study methods was observed. High-quality studies are needed to study energy and protein intake as a possible mechanism for unintended weight loss and malnutrition in both patients with MCI and AD.

Hoe kunnen we onze veedieren weer Europees voer voorschotelen?
Visser, Chris de - \ 2018
Ecology dictates evolution? about the importance of genetic and ecological constraints in adaptation
Vos, Marjon G.J. de; Schoustra, Sijmen E. ; Visser, J.A.G.M. de - \ 2018
Europhysics Letters 122 (2018)5. - ISSN 0295-5075

The topography of the adaptive landscape is a major determinant of the course of evolution. In this review we use the adaptive landscape metaphor to highlight the effect of ecology on evolution. We describe how ecological interactions modulate the shape of the adaptive landscape, and how this affects adaptive constraints. We focus on microbial communities as model systems.

The ELR-SOBIR1 complex functions as a two-component receptor-like Kinase to mount defense against phytophthora infestans
Domazakis, Emmanouil ; Wouters, Doret ; Visser, Richard G.F. ; Kamoun, Sophien ; Joosten, Matthieu H.A.J. ; Vleeshouwers, Vivianne G.A.A. - \ 2018
Molecular Plant-Microbe Interactions 31 (2018)8. - ISSN 0894-0282 - p. 795 - 802.

The ELICITIN RESPONSE protein (ELR) from Solanum microdontum can recognize INF1 elicitin of Phytophthora infestans and trigger defense responses. ELR is a receptor-like protein (RLP) that lacks a cytoplasmic signaling domain and is anticipated to require interaction with a signaling-competent receptor-like kinase. SUPPRESSOR OF BIR1-1 (SOBIR1) has been proposed as a general interactor for RLPs involved in immunity and, as such, is a potential interactor for ELR. Here, we investigate whether SOBIR1 is required for response to INF1 and resistance to P. infestans and whether it associates with ELR. Our results show that virus-induced gene silencing of SOBIR1 in Nicotiana benthamiana leads to loss of INF1-triggered cell death and increased susceptibility to P. infestans. Using genetic complementation, we found that the kinase activity of SOBIR1 is required for INF1-triggered cell death. Coimmunoprecipitation experiments showed that ELR constitutively associates with potato SOBIR1 in planta, forming a bipartite receptor complex. Upon INF1 elicitation, this ELR-SOBIR1 complex recruits SERK3 (SOMATIC EMBRYOGENESIS RECEPTOR KINASE 3) leading to downstream signaling activation. Overall, our study shows that SOBIR1 is required for basal resistance to P. infestans and for INF1-triggered cell death and functions as an adaptor kinase for ELR.

The role of tomato WRKY genes in plant responses to combined abiotic and biotic stresses
Bai, Yuling ; Sunarti, Sri ; Kissoudis, Christos ; Visser, Richard G.F. ; Linden, C.G. van der - \ 2018
Frontiers in Plant Science 9 (2018). - ISSN 1664-462X
Abiotic stress - Biotic stress - Combined stresses - Disease resistance - Effector-triggered immunity (ETI) - PAMP-triggered immunity (PTI)

In the field, plants constantly face a plethora of abiotic and biotic stresses that can impart detrimental effects on plants. In response to multiple stresses, plants can rapidly reprogram their transcriptome through a tightly regulated and highly dynamic regulatory network where WRKY transcription factors can act as activators or repressors. WRKY transcription factors have diverse biological functions in plants, but most notably are key players in plant responses to biotic and abiotic stresses. In tomato there are 83 WRKY genes identified. Here we review recent progress on functions of these tomato WRKY genes and their homologs in other plant species, such as Arabidopsis and rice, with a special focus on their involvement in responses to abiotic and biotic stresses. In particular, we highlight WRKY genes that play a role in plant responses to a combination of abiotic and biotic stresses.

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