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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    We will mail you new results for this query: keywords==biologische zaden
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Green breeding : new models for plant breeding: Key elements for collaboration within the food chain
Scholten, O.E. ; Lammerts Van Bueren, E. - \ 2014
Wageningen UR
plantenveredeling - biologische plantenveredeling - biologische landbouw - voedselketens - biologische zaden - plant breeding - organic plant breeding - organic farming - food chains - organic seeds
As the financial threshold for cost-effective breeding continues to be raised, increasingly more crops are becoming ‘too small’ for breeding. For example, an arable crop such as oats is nowadays considered unprofitable by some commercial breeding companies. For many grain legumes, breeding programmes were cut back years ago. And among vegetables, breeding programmes for minor crops such as black salsify and parsnip are gradually being abandoned. The long-term consequence is that production of these crops will become increasingly difficult, because the available varieties will not be adapted to future changes in the cultivation system (new methods, new diseases, etc). The question is how to develop alternative crop breeding models for small markets. The research programme Green Breeding (2010-2019) focusses on breeding of varieties that can cope with less nutrients and water and on resistance breeding to avoid pest and diseases. The research is on potato, leek, spinach and tomato. Next to those projects also some pilot studies are conducted on e.g. chain-approach in breeding and lupine breeding.
Breeding and regulatory opportunities and constraints for developing broccoli cultivars adapted to organic agriculture
Renaud, E.N.C. - \ 2014
University. Promotor(en): Edith Lammerts van Bueren; J.R. Myers, co-promotor(en): J.L.S. Jiggins; J.A. Juvik. - Wageningen : Wageningen University - ISBN 9789462570306 - 245
brassica oleracea var. italica - broccoli - biologische zaden - plantenveredeling - biologische plantenveredeling - zaadvoorschriften - biologische landbouw - organic seeds - plant breeding - organic plant breeding - seed regulations - organic farming

This thesis is about the regulatory and technical challenges to the organic seed and breeding sector. This study specifically explored the mutual influence of the regulatory environment for organic seed sector development in the United States (US), Europe Union (EU) and Mexico, and the extent to which cultivars performed differently under organic conditions compared to conventional conditions, measured by selected horticultural and phytochemical traits. Organic farming practices often differ substantially from conventional practices and in the diversity of their crop rotations and market outlets. Currently, organic farmers depend largely on cultivars bred for conventional farming systems. We investigated the requirements of organic growers for seed that allowed optimization of their production system, and fulfilled consumer expectations for high nutritional value. In addition, we discuss the implications for seed production and crop improvement. Broccoli is one of the most important horticultural crops in the world’s fastest growing organic product market, the US. The field research was based on stakeholder interviews, participant observation, documentary analyses, laboratory analyses and paired field trials (organic/conventional) conducted in two contrasting regions in the US, Northeast US (Maine) and Pacific Northwest (Oregon), over two seasons (spring, fall) and two years for a total of 16 trials with 23 cultivars. The main findings of the regulatory component were: (1) New organizations, procedural arrangements and activities have emerged in the US, EU and Mexico to support organic seed regulatory development, with both positive and negative results; (2) Official guidance on the interpretation of the regulation in the US has not been sufficiently decisive to prevent divergent interpretation and practice, and in consequence the needs of a rapidly growing economic sector are not being met; and (3) Growth of the organic seed sector is hindered by regulatory imbalances and trade incompatibilities within and between global markets. For the field studies the main findings were: (1) In the partitioning of variance, location and season had the largest effect on broccoli head weight. For glucoraphanin and lutein, genotype was the major source of total variation; for glucobrassicin, region and the interaction of location and season; and for neoglucobrassicin, both genotype and its interactions with season were important. For δ- and γ- tocopherols, season played the largest role in the total variation followed by location and genotype; for total carotenoids, genotype was the largest source of variation and its interactions with location and season. For both horticultural and phytochemical concentrations, Management main effect and G × M interactions were often small but G × M × E (location and season) were large; (2) Cultivars with both greater head weight and stability under conventional conditions generally had high head weight and stability under organic growing conditions, although there were exceptions in cultivar rank between management systems. Cultivars highest in tocopherols and carotenoids were open pollinated or early maturing F1hybrids. Distinct locations and seasons were identified where phytochemical performance was higher for each compound; (3) Larger genotypic variances and somewhat increased error variances were observed in organic compared to conventional management systems led to repeatabilities for several horticultural and phytochemical traits that were similar or even higher in organic compared to conventional conditions; (4) The ratio of correlated response (predicting performance under organic conditions when evaluated in conventional conditions) to direct response (predicted performance in organic when evaluated under organic conditions) for all traits was close to but less than 1.0 with the exception of bead uniformity. This would imply that in most cases, direct selection in an organic environment could result in a more rapid genetic gain than indirect selection in a conventional environment; (5) Correlations among phytochemical traits demonstrated that glucoraphanin was negatively correlated with the carotenoids and the carotenoids were highly correlated with one another; and (6) There was little or no association between phytochemical concentration and date of cultivar release, suggesting that modern breeding has not negatively influenced the level of tested compounds and there were no significant differences among cultivars from different seed companies. Based on the findings strategies for breeding and seed models are discussed.

Organic knowledge update : propagation material and organic breeding : vigorous propagation material and organic breeding in the Netherlands
Scholten, O.E. - \ 2011
Wageningen UR, Communication Services
biologische plantenveredeling - biologische landbouw - biologische zaden - vermeerderingsmateriaal - onderzoeksprojecten - nederland - organic plant breeding - organic farming - organic seeds - propagation materials - research projects - netherlands
Brochure met informatie over uitgangsmateriaal en veredeling in de biologische landbouw in Nederland.
Belangrijke rol bloeminfecties bij infecties van kool (Brassica) zaad met Xanthomonas
Wolf, J.M. van der; Zouwen, P.S. van der; Haas, B.H. de; Köhl, J. - \ 2009
brassica - zaadproductie - xanthomonas campestris pv. campestris - vermeerderingsmateriaal - infectieziekten - plantenziekten - biologische zaden - biologische plantenveredeling - seed production - propagation materials - infectious diseases - plant diseases - organic seeds - organic plant breeding
Poster met resultaten uit onderzoek naar de fase van de plantontwikkeling tijdens welke infecties met Xanthomonas kunnen leiden tot zaadinfecties, en de rol van de (bestuivende) insecten bij het ontstaan van zaadinfecties
Plantaardig uitgangsmateriaal en veredeling
Scholten, O.E. ; Groot, S.P.C. ; Lammerts Van Bueren, E. - \ 2009
Ekoland 29 (2009)1. - ISSN 0926-9142 - p. 46 - 47.
biologische landbouw - plantenveredeling - zaden - vermeerderingsmateriaal - rassen (planten) - resistentie van variëteiten - biologische plantenveredeling - biologische zaden - bemesting - organic farming - plant breeding - seeds - propagation materials - varieties - varietal resistance - organic plant breeding - organic seeds - fertilizer application
De biologische landbouw heeft rassen nodig die zich krachtig ontwikkelen na uitzaai, een goede weerbaarheid hebben tegen ziekten en plagen en die bestand zijn tegen lage bemestingsniveaus. Veredeling van robuuste rassen is daarom een belangrijk speerpunt in het onderzoek Robuust Plantaardig Uitgangsmateriaal. Dit geldt ook voor het verbeteren van de kwaliteit van zaaizaad en ander uitgangsmateriaal
Kwaliteit van zaaizaad kool verbeteren
Groot, S.P.C. - \ 2008
BioKennis bericht Akkerbouw & vollegrondsgroenten 12 (2008).
biologische landbouw - akkerbouw - vermeerderingsmateriaal - zaadproductie - koolsoorten - oogsttijdstip - rijpheid - ziektebestrijding - plantenpigmenten - zaadkieming - fusarium - alternaria - vollegrondsteelt - biologische zaden - organic farming - arable farming - propagation materials - seed production - cabbages - harvesting date - maturity - disease control - plant pigments - seed germination - outdoor cropping - organic seeds
Kwalitatief goed biologisch zaaizaad voor koolsoorten is moeilijk te produceren. Oorzaken zijn de ongelijkmatige bloei en afrijping van het zaad. Daarnaast kunnen schimmels en bacteriën via het zaad de plant besmetten. In dit biokennis bericht informatie over onderzoek aan apparatuur die het optimale oogsttijdstip bepaalt of de zieke zaden eruit selecteert.
Gezond en vitaal biologisch uitgangsmateriaal
Bulk, R.W. van den; Groot, S.P.C. ; Jalink, H. ; Langerak, C.J. ; Stevens, L.H. ; Wolf, J.M. van der - \ 2004
biologische landbouw - vermeerderingsmateriaal - biologische productie - stekken - zaadbehandeling - desinfectie - biologische zaden - organic farming - propagation materials - biological production - cuttings - seed treatment - disinfection - organic seeds
Poster met onderzoeksinformatie: Een goede kwaliteit uitgangsmateriaal vormt de basis voor een gezond en goed groeiend gewas. Het uitgangsmateriaal moet gezond zijn, een goede kiemkracht bezitten, o.a. om competitie met onkruiden aan te kunnen gaan. Daarnaast moet uitgangsmateriaal voor de biologische landbouw ook biologisch geproduceerd worden. Verscheidene zaad- en pootgoed leveranciers zijn deze uitdaging aangegaan. Om knelpunten die hierbij optreden aan te pakken wordt bij Wageningen UR onderzoek gedaan.
Gewasbeschermingsmiddelen van natuurlijke oorsprong voor behandeling van biologisch zaad
Wolf, J.M. van der; Birnbaum, Y.E. - \ 2003
zaadbehandeling - gewasbescherming - plantenziektebestrijding - etherische oliën - fytochemicaliën - natuurlijke producten - biologische zaden - seed treatment - plant protection - plant disease control - essential oils - phytochemicals - natural products - organic seeds
Poster met onderzoeksresultaten: In de biologische landbouw wordt gezocht naar fysische methoden en gewasbeschermingsmiddelen van natuurlijke oorsprong (GNO’s) waarmee effectief zaadovergaande ziekteverwekkers op het zaad kunnen worden bestreden. Hierna kan het gedesinfecteerde zaad effectief worden gecoat met antagonisten. We laten hier de effectiviteit van tijmolie zien voor bestrijding van bacteriën en schimmels op zaad.
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