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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    Wilde verwanten van prei uit Griekenland beschikbaar als speciale collectie
    Kik, Chris ; Menting, Frank - \ 2020
    On the origin and dispersal of cultivated spinach (Spinacia oleracea L.)
    Ribera, Arnau ; Treuren, R. van; Kik, C. ; Bai, Y. ; Wolters, A.M.A. - \ 2020
    Genetic Resources and Crop Evolution (2020). - ISSN 0925-9864
    Spinach (Spinacia oleracea L.) is an economically important crop that is cultivated and consumed worldwide. Spinach is interfertile with the wild species S. tetrandra Steven ex M. Bieb. and S. turkestanica Iljin that therefore are presumed to include the most likely crop ancestor. Here we studied variation in 60 Single Nucleotide Polymorphisms (SNP) previously identified in S. oleracea to address the issue of crop ancestry and domestication region. For this purpose we investigated 95 accessions, including 54 spinach landraces from a wide geographic area in Europe and Asia and 16 S. tetrandra and 25 S. turkestanica populations of which the majority had only recently become available. Compared to S. tetrandra substantially higher levels of amplification success and higher levels of variation were detected for S. turkestanica, indicating that S. oleracea is genetically closer to S. turkestanica than to S. tetrandra. Our phylogenetic and population structure analysis supported the conclusion that S. turkestanica is the most likely ancestor of cultivated spinach. In addition, these analyses revealed a group of S. oleracea landraces from Eastern and Southern Asia with a strong genetic resemblance to S. turkestanica. This group includes landraces from Afghanistan and Pakistan, which are part of the native distribution range of S. turkestanica. The domestication of spinach may therefore have occurred more eastwards than generally assumed. Furthermore, our study provides support for the hypothesis that after domestication, spinach was introduced into China via Nepal. Additional collecting of spinach landraces is recommended in order to allow the more precise reconstruction of the crop migration routes.
    CGN: The importance of genetic diversity
    Treuren, Rob van; Kik, Chris ; Heijink, Jarinka - \ 2020
    CGN: Het belang van genetische variatie
    Treuren, R. van; Kik, C. - \ 2020
    Wageningen : CGN
    Het Centrum voor Genetische Bronnen (CGN) beheert de Nederlandse genenbank voor plantaardige genetische bronnen, met ruim 23.000 rassen en wilde populaties. Hoe komen deze zaden in de collectie en wat gebeurt er voordat zaden gebruikt kunnen worden door veredelaars en onderzoekers? Rob van Treuren en Chris Kik vertellen het in deze video.
    Genetic diversity and structure of Nordic, Baltic, Czech and Croatian potato onion (Allium cepa Aggregatum group) collections
    Runģis, D. ; Leino, M. ; Lepse, L. ; Ban, S.G. ; Vahl, E. de; Annamaa, K. ; Põldma, P. ; Suojala-Ahlfors, T. ; Juškevičienė, D. ; Kik, C. ; Vågen, I.M. ; Stavělíková, H. - \ 2020
    Genetic Resources and Crop Evolution 68 (2020). - ISSN 0925-9864 - p. 657 - 665.
    Potato onions (Allium cepa var aggregatum G. Don) are multiplying or aggregating onions, very similar to shallots and have been historically cultivated throughout Europe. Currently in Northern Europe they are maintained in home gardens and ex situ field collections. Potato onions are primarily vegetatively propagated, however in Estonia, near Lake Peipsi, this species has been propagated by seed since the seventeenth century. There is increasing interest in Northern Europe in utilizing this germplasm in organic and/or sustainable farming systems. The genetic diversity and relationship between and within European potato onion collections is unclear. From historical records it is known that cultivation, exchange and trade of potato onion has occurred throughout Europe for hundreds of years. This study utilised molecular markers to assess genetic diversity, duplication of genotypes and relationships among and between Nordic, Baltic, Czech and Croatian potato onion collections. Of 264 accessions, 80 catalogued as unique had identical genotypes with one or more other accessions, and are putative duplicates. The genetic diversity within two Estonian sexually propagated accessions was comparable to that found in all of the vegetatively propagated accessions. Accessions from the Nordic countries grouped together genetically, as did Latvian and Lithuanian accessions. Croatian accessions were genetically separated. These genetic relationships suggest historical movement of potato onion germplasm in North-Eastern Europe. The results, in conjunction with other passport and characterization data, can assist in the development of potato onion core collections, facilitating the conservation and utilization of valuable potato onion genetic resources.
    ‘Nature offers us plenty of genetic variation’
    Kik, Chris - \ 2020
    A review on the genetic resources, domestication and breeding history of spinach (Spinacia oleracea L.)
    Ribera, Arnau ; Bai, Y. ; Wolters, A.M.A. ; Treuren, R. van; Kik, C. - \ 2020
    Euphytica 216 (2020)48. - ISSN 0014-2336 - 21 p.
    This paper addresses the genetic resources, domestication and breeding history of spinach as a comprehensive review of these crop aspects is currently unavailable. It is shown that the availability of genetic resources of wild relatives belonging to the primary gene pool is currently very limited, which hampers breeding and research activities. Therefore, new collecting expeditions are clearly warranted. The domestication of spinach is discussed on the basis of its presumed migration routes and the traits that were probably involved in the domestication syndrome. Spinach is thought to have domesticated in former Persia. Migration then occurred eastwards to China and westwards to Europe, but additional genetic data are needed to reveal the most likely migration routes. Morphological changes in pistillate flowers and loss of dormancy are identified as the main traits involved in the domestication syndrome of spinach. To a large extent we could re-construct the relationships between spinach cultivars that were developed until the 1950s, but this appeared difficult for the more recent cultivars due to intellectual property protection by breeding companies. Resistance against downy mildew has been the main breeding target in spinach. The introgression of NBS-LRR resistance genes from wild relatives is the major strategy to develop downy mildew resistant cultivars. However, the use of loss-of-function alleles of susceptibility genes may provide a more durable strategy to develop resistant cultivars. So far, abiotic resistance and quality traits have received minor attention in spinach research and breeding. This is expected to change considering the potential effects of climate change on these traits.
    Acquisition and regeneration of Spinacia turkestanica Iljin and S. tetrandra Steven ex M. Bieb. to improve a spinach gene bank collection
    Treuren, R. van; Groot, E.C. de; Hisoriev, H. ; Khassanov, F. ; Farzaliyev, V. ; Melyan, G. ; Gabrielyan, I. ; Soest, L.J.M. ; Tulmans, C. ; Courand, D. de; Visser, J. de; Kimura, R. ; Boshoven, J.C. ; Kanda, T. ; Goossens, R. ; Verhoef, M. ; Dijkstra, Jan ; Kik, C. - \ 2020
    Genetic Resources and Crop Evolution 67 (2020). - ISSN 0925-9864 - p. 549 - 559.
    Spinach (Spinacia oleracea L.) is a highly nutritious leafy vegetable and an economically important food crop. The wild species S. turkestanica Iljin and S. tetrandra Steven ex M. Bieb. are inter-fertile with cultivated spinach and constitute important sources of novel characters to improve spinach varieties, such as for their resistance to pests and diseases. Despite their relevance in plant breeding, S. turkestanica and S. tetrandra are poorly represented in genetic resources collections. Among the reasons for these collection gaps are the difficulties in propagating these species ex situ. Here we report on the results of collecting expeditions for S. turkestanica in Central Asia and for S. tetrandra in the Trans-Caucasus, which were organized by the Dutch gene bank in collaboration with several breeding companies. Furthermore, we also present efficient protocols for the ex situ regeneration of these species. These protocols were used to successfully regenerate 66 S. turkestanica and 36 S. tetrandra samples from the collecting expeditions. These new accessions fill up important collection gaps in ex situ conserved genetic resources of spinach and can be used for exploitation in crop improvement.
    Korte Ketens
    Bas, Noortje ; Kik, Chris - \ 2019
    Biodiversiteit, de Oerakker, Oranje lijst en Erfgoedzaden
    Kik, Chris - \ 2019
    De Oerakker voorjaarsbijeenkomst 2019
    Kik, Chris - \ 2019
    De voorjaarsbijeenkomst vond plaats op 3 juli bij de Stadstuin Helmond en bij de Collectieboomgaard van Ger van Santvoort te Someren. Aan deze bijeenkomst werd door ca. 25 personen deelgenomen.
    Eucarpia Leafy Vegetables International Conference 2019
    Kik, Chris ; Treuren, Rob van - \ 2019
    De beste bank?: de genenbank!
    Kik, Chris - \ 2019
    Report of a Lactuca altaica Fisch. & C.A. Mey and L. serriola L. collecting expedition in Uzbekistan; Iternary, collected material and data : CGN report 45
    Kik, C. ; Makhmudov, A. ; Khassanov, F.O. - \ 2019
    Wageningen : Wageningen UR, Centre for Genetic Resources (CGN report 45) - 15 p.
    De Oerakker: a platform facilitating the conservation and use of old Dutch varieties
    Kik, C. ; Bas, N. ; Dooijeweert, W. van; Menting, F.B.J. - \ 2019
    Landraces 2019 (2019)4. - ISSN 2281-2067 - p. 19 - 20.
    A historic overview of the Dutch efforts concerning the conservation and use of old crop varieties is presented. Also attention is given to the current efforts to properly describe, multiply and market Dutch heritage varieties in order to maintain this precious material in a sustainable manner.
    Highlights uit een jaar genenbankieren
    Kik, C. ; Bas, N. - \ 2019

    De CGN collecties worden voortdurend verbeterd door het toevoegen van nieuw materiaal. De zaadvoorraad en de kwaliteit van de zaden wordt op peil gehouden door het materiaal te vermeerderen als de zaden opraken of hun kiemkracht verliezen. Een aantal highlights uit 2018.

    Zaden in een poolkluis
    Kik, C. ; Groot, E.C. de - \ 2019
    Veel activiteiten en een nieuwe voorzitter bij de Oerakker
    Kik, C. - \ 2019

    Tijdens de jaarlijkse najaarsbijeenkomst van Stichting de Oerakker op 22 november 2018 heeft Obe Bootsma afscheid genomen als voorzitter. Rob Plomp werd gepresenteerd als de nieuwe voorzitter. Daarnaast werden er voor de 40 deelnemers interessante presentaties en workshops gegeven, die aanleiding gaven tot veel discussie.

    Internationale cursus plantaardige genetische bronnen wordt goed gewaardeerd
    Kik, C. ; Brink, M. - \ 2018

    In deze cursus wordt inzicht gegeven hoe plantaardige genetische bronnen beheerd kunnen worden. Daarnaast wordt de huidige internationale wet en regelgeving m.b.t. uitwisseling van genetische bronnen behandeld.

    On the possibility to determine the frequency of disease resistance genes involved in (multiple) gene-for-gene resistance via molecular markers in order to optimize sampling sizes in collecting missions : Internal report
    Kik, C. - \ 2018
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