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.

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Marginal agricultural land low-input systems for biomass production
Cossel, Moritz Von ; Lewandowski, Iris ; Elbersen, Berien ; Staritsky, Igor ; Eupen, Michiel Van; Iqbal, Yasir ; Mantel, Stefan ; Scordia, Danilo ; Testa, Giorgio ; Cosentino, Salvatore Luciano ; Maliarenko, Oksana ; Eleftheriadis, Ioannis ; Zanetti, Federica ; Monti, Andrea ; Lazdina, Dagnija ; Neimane, Santa ; Lamy, Isabelle ; Ciadamidaro, Lisa ; Sanz, Marina ; Carrasco, Juan Esteban ; Ciria, Pilar ; McCallum, Ian ; Trindade, Luisa M. ; Loo, Eibertus N. Van; Elbersen, Wolter ; Fernando, Ana Luisa ; Papazoglou, Eleni G. ; Alexopoulou, Efthymia - \ 2019
Energies 12 (2019)16. - ISSN 1996-1073
Bio-based industry - Bioeconomy - Bioenergy - Biomass - Industrial crop - Low-input agriculture - MALLIS - Marginal land - Perennial crop - Sustainable agriculture

This study deals with approaches for a social-ecological friendly European bioeconomy based on biomass from industrial crops cultivated on marginal agricultural land. The selected crops to be investigated are: Biomass sorghum, camelina, cardoon, castor, crambe, Ethiopian mustard, giant reed, hemp, lupin, miscanthus, pennycress, poplar, reed canary grass, safflower, Siberian elm, switchgrass, tall wheatgrass, wild sugarcane, and willow. The research question focused on the overall crop growth suitability under low-input management. The study assessed: (i) How the growth suitability of industrial crops can be defined under the given natural constraints of European marginal agricultural lands; and (ii) which agricultural practices are required for marginal agricultural land low-input systems (MALLIS). For the growth-suitability analysis, available thresholds and growth requirements of the selected industrial crops were defined. The marginal agricultural land was categorized according to the agro-ecological zone (AEZ) concept in combination with the marginality constraints, so-called 'marginal agro-ecological zones' (M-AEZ). It was found that both large marginal agricultural areas and numerous agricultural practices are available for industrial crop cultivation on European marginal agricultural lands. These results help to further describe the suitability of industrial crops for the development of social-ecologically friendly MALLIS in Europe.

Nitrogen and phosphorus constrain the CO2 fertilization of global plant biomass
Terrer, César ; Jackson, Robert B. ; Prentice, I.C. ; Keenan, Trevor F. ; Kaiser, Christina ; Vicca, Sara ; Fisher, Joshua B. ; Reich, Peter B. ; Stocker, Benjamin D. ; Hungate, Bruce A. ; Peñuelas, Josep ; McCallum, Ian ; Soudzilovskaia, Nadejda A. ; Cernusak, Lucas A. ; Talhelm, Alan F. ; Sundert, Kevin Van; Piao, Shilong ; Newton, Paul C.D. ; Hovenden, Mark J. ; Blumenthal, Dana M. ; Liu, Yi Y. ; Müller, Christoph ; Winter, Klaus ; Field, Christopher B. ; Viechtbauer, Wolfgang ; Lissa, Caspar J. Van; Hoosbeek, Marcel R. ; Watanabe, Makoto ; Koike, Takayoshi ; Leshyk, Victor O. ; Polley, H.W. ; Franklin, Oskar - \ 2019
Nature Climate Change 9 (2019). - ISSN 1758-678X - p. 684 - 689.

Elevated CO2 (eCO2) experiments provide critical information to quantify the effects of rising CO2 on vegetation1–6. Many eCO2 experiments suggest that nutrient limitations modulate the local magnitude of the eCO2 effect on plant biomass1,3,5, but the global extent of these limitations has not been empirically quantified, complicating projections of the capacity of plants to take up CO2 7,8. Here, we present a data-driven global quantification of the eCO2 effect on biomass based on 138 eCO2 experiments. The strength of CO2 fertilization is primarily driven by nitrogen (N) in ~65% of global vegetation and by phosphorus (P) in ~25% of global vegetation, with N- or P-limitation modulated by mycorrhizal association. Our approach suggests that CO2 levels expected by 2100 can potentially enhance plant biomass by 12 ± 3% above current values, equivalent to 59 ± 13 PgC. The global-scale response to eCO2 we derive from experiments is similar to past changes in greenness9 and biomass10 with rising CO2, suggesting that CO2 will continue to stimulate plant biomass in the future despite the constraining effect of soil nutrients. Our research reconciles conflicting evidence on CO2 fertilization across scales and provides an empirical estimate of the biomass sensitivity to eCO2 that may help to constrain climate projections.

Recent Advances in Forest Observation with Visual Interpretation of Very High-Resolution Imagery
Schepaschenko, Dmitry ; See, Linda ; Lesiv, Myroslava ; Bastin, Jean-François ; Mollicone, Danilo ; Tsendbazar, Nandin-Erdene ; Bastin, Lucy ; McCallum, Ian ; Laso Bayas, Juan Carlos ; Baklanov, Artem ; Perger, Christoph ; Dürauer, Martina ; Fritz, Steffen - \ 2019
Surveys in Geophysics 40 (2019)4. - ISSN 0169-3298 - p. 839 - 862.
The land area covered by freely available very high-resolution (VHR) imagery has grown dramatically over recent years, which has considerable relevance for forest observation and monitoring. For example, it is possible to recognize and extract a number of features related to forest type, forest management, degradation and disturbance using VHR imagery. Moreover, time series of medium-to-high-resolution imagery such as MODIS, Landsat or Sentinel has allowed for monitoring of parameters related to forest cover change. Although automatic classification is used regularly to monitor forests using medium-resolution imagery, VHR imagery and changes in web-based technology have opened up new possibilities for the role of visual interpretation in forest observation. Visual interpretation of VHR is typically employed to provide training and/or validation data for other remote sensing-based techniques or to derive statistics directly on forest cover/forest cover change over large regions. Hence, this paper reviews the state of the art in tools designed for visual interpretation of VHR, including Geo-Wiki, LACO-Wiki and Collect Earth as well as issues related to interpretation of VHR imagery and approaches to quality assurance. We have also listed a number of success stories where visual interpretation plays a crucial role, including a global forest mask harmonized with FAO FRA country statistics; estimation of dryland forest area; quantification of deforestation; national reporting to the UNFCCC; and drivers of forest change.
A comparison of global agricultural monitoring systems and current gaps
Fritz, Steffen ; See, Linda ; Bayas, Juan Carlos Laso ; Waldner, François ; Jacques, Damien ; Becker-Reshef, Inbal ; Whitcraft, Alyssa ; Baruth, Bettina ; Bonifacio, Rogerio ; Crutchfield, Jim ; Rembold, Felix ; Rojas, Oscar ; Schucknecht, Anne ; Velde, Marijn Van der; Verdin, James ; Wu, Bingfang ; Yan, Nana ; You, Liangzhi ; Gilliams, Sven ; Mücher, Sander ; Tetrault, Robert ; Moorthy, Inian ; McCallum, Ian - \ 2019
Agricultural Systems 168 (2019). - ISSN 0308-521X - p. 258 - 272.
Crop area - Crop calendars - Crop production - Earth observation - Gaps - Global agricultural monitoring - In-situ data - Spatial resolution - Yield

Global and regional scale agricultural monitoring systems aim to provide up-to-date information regarding food production to different actors and decision makers in support of global and national food security. To help reduce price volatility of the kind experienced between 2007 and 2011, a global system of agricultural monitoring systems is needed to ensure the coordinated flow of information in a timely manner for early warning purposes. A number of systems now exist that fill this role. This paper provides an overview of the eight main global and regional scale agricultural monitoring systems currently in operation and compares them based on the input data and models used, the outputs produced and other characteristics such as the role of the analyst, their interaction with other systems and the geographical scale at which they operate. Despite improvements in access to high resolution satellite imagery over the last decade and the use of numerous remote-sensing based products by the different systems, there are still fundamental gaps. Based on a questionnaire, discussions with the system experts and the literature, we present the main gaps in the data and in the methods. Finally, we propose some recommendations for addressing these gaps through ongoing improvements in remote sensing, harnessing new and innovative data streams and the continued sharing of more and more data.

Land management: data availability and process understanding for global change studies
Erb, Karl-Heinz ; Luyssaert, Sebastiaan ; Meyfroidt, Patrick ; Pongratz, Julia ; Don, Axel ; Kloster, Silvia ; Kuemmerle, Tobias ; Fetzel, Tamara ; Fuchs, Richard ; Herold, Martin ; Haberl, Helmut ; Jones, Chris D. ; Marín-Spiotta, Erika ; McCallum, Ian ; Robertson, Eddy ; Seufert, Verena ; Fritz, Steffen ; Valade, Aude ; Wiltshire, Andrew ; Dolman, Albertus J. - \ 2017
Global Change Biology 23 (2017)2. - ISSN 1354-1013 - p. 512 - 533.
In the light of daunting global sustainability challenges such as climate change, biodiversity loss and food security, improving our understanding of the complex dynamics of the Earth system is crucial. However, large knowledge gaps related to the effects of land management persist, in particular those human-induced changes in terrestrial ecosystems that do not result in land-cover conversions. Here, we review the current state of knowledge of ten common land management activities for their biogeochemical and biophysical impacts, the level of process understanding and data availability. Our review shows that ca. one-tenth of the ice-free land surface is under intense human management, half under medium and one-fifth under extensive management. Based on our review, we cluster these ten management activities into three groups: (i) management activities for which data sets are available, and for which a good knowledge base exists (cropland harvest and irrigation); (ii) management activities for which sufficient knowledge on biogeochemical and biophysical effects exists but robust global data sets are lacking (forest harvest, tree species selection, grazing and mowing harvest, N fertilization); and (iii) land management practices with severe data gaps concomitant with an unsatisfactory level of process understanding (crop species selection, artificial wetland drainage, tillage and fire management and crop residue management, an element of crop harvest). Although we identify multiple impediments to progress, we conclude that the current status of process understanding and data availability is sufficient to advance with incorporating management in, for example, Earth system or dynamic vegetation models in order to provide a systematic assessment of their role in the Earth system. This review contributes to a strategic prioritization of research efforts across multiple disciplines, including land system research, ecological research and Earth system modelling.
National monitoring, reporting and evaluation of climate change adaptation in Europe
Pringle, P. ; Karali, E. ; Klostermann, J.E.M. ; Mäkinen, K. ; Prutsch, A. ; Hildén, M. ; Swart, R.J. ; Street, R. ; MCCallum, S. - \ 2015
Copenhagen : European Environment Agency (EEA Technical Report 20/2015) - ISBN 9789292137052 - 68
Climate Change Adaptation Manual : Lessons learned from European and other industrialised countries
Prutsch, Andrea ; Grothmann, Torsten ; MCCallum, S. ; Schauser, I. ; Swart, R.J. - \ 2014
London : Routledge - ISBN 9780203381267 - 378 p.
economics - finance - business & industry - environment and sustainability - law - politics & international relations
Due to the lack of success in climate change mitigation efforts, the importance of adaptation is becoming more and more apparent and is now one of the main imperatives of international research and action. However, research on adaptation is mostly not directly applicable to adaptation policy or practice, leaving a gap between scientific results and practical advice for decision makers and planners. This book seeks to address this problem and bridge the gap and should provide readers with practical and applicable information on climate change adaptation.Following an introduction, the book is organised into four main sections, each reflecting an essential component in the adaptation process. Climate change adaptation is an emerging subject area and has gained increased political and academic attention within the last decade. Whereas most books in the field focus on adaptation in developing countries, this volume provides an examination of predominantly European policy and offers inter-disciplinary insight into cutting edge knowledge and lessons learnt in a relatively new field of implementation.
Future directions for national adaptation policies in Europe
Swart, R.J. ; Biesbroek, G.R. ; Hildén, M. ; Isoard, S. ; Prutsch, A. ; MCCallum, S. - \ 2014
In: National adaptation policy processes in European countries - 2014 Luxembourgh : European Environment Agency (EEA Report No 4/2014) - ISBN 9789292134853 - p. 112 - 114.
Setting the scene for public intervention on adaptation
MCCallum, S. ; Isoard, S. ; Prutsch, A. ; Biesbroek, G.R. - \ 2014
In: National adaptation policy processes in European countries - 2014 Luxembourgh : European Environment Agency (EEA Report 4/2014) - ISBN 9789292134853 - p. 17 - 21.
Methodological approach
Isoard, S. ; Prutsch, A. ; MCCallum, S. ; Biesbroek, G.R. ; Mäkinen, K. ; Hildén, M. ; Downing, C. ; Street, R. - \ 2014
In: National adaptation policy processes in European countries - 2014 Luxembourgh : European Environment Agency (EEA Report 4/2014) - ISBN 9789292134853 - p. 14 - 14.
Objectives and Intended Users
Isoard, S. ; Prutsch, A. ; MCCallum, S. ; Biesbroek, G.R. - \ 2014
In: National adaptation policy processes in European countries - 2014 Luxembourgh : European Environment Agency (EEA Report 4/2014) - ISBN 9789292134853 - p. 12 - 12.
Support to the development of EuAdaptStrat to Climate Change: Background report to the IA, Part I - Problem definition, policy context and assessment of policy options. Environment Agency Austria, Vienna
MCCallum, S. ; Dworak, T. ; Prutsch, A. ; Kent, N. ; Mysiak, J. ; Bosello, F. ; Klostermann, J.E.M. ; Diugolecki, A. ; Williams, E. ; Konig, M. ; Leitner, M. ; Miller, K. ; Harley, M. ; Smithers, R. ; Berglund, M. ; Glas, N. ; Romanovska, L. ; Sandt, K. van de; Bachschmidt, R. ; Völler, S. ; Horrocks, L. - \ 2013
Vienna : Environment Agency Austria - 836
climatic change - klimaatverandering
The need for improved maps of global cropland
Fritz, S. ; See, L. ; Justice, C. ; Becker-Reshef, I. ; Bydekerke, L. ; Cumani, R. ; Defourny, P. ; Erb, K. ; Foley, J. ; Gilliams, S. ; Gong, P. ; Hansen, M. ; Hertel, T. ; Herold, M. ; Herrero, M. ; Kayitakire, F. ; Latham, J. ; Leo, O. ; MCCallum, I. ; Obersteiner, M. ; Ramankutty, N. ; Rocha, J. ; Tang, H. ; Thornton, P. ; Vancutsem, C. ; Velde, M. van der; Wood, S. ; Woodcock, C. - \ 2013
EOS: Transactions, American Geophysical Union 94 (2013)3. - ISSN 0096-3941 - p. 31 - 32.
Food security is a key global concern. By 2050, the global population will exceed 9 billion, and a 50% increase in annual agricultural output will be required to keep up with demand. There are significant additional pressures on existing agricultural land through increased competition from the biofuel sector and the need to elevate feed production, which is being driven by higher levels of meat consumption in low- and middle-income countries
AlliumMap-A comparative genomics resource for cultivated Allium vegetables
McCallum, J. ; Baldwin, S. ; Shigyo, M. ; Deng, Y.B. ; Heusden, A.W. van; Pither-Joyce, M. ; Kenel, F. - \ 2012
BMC Genomics 13 (2012). - ISSN 1471-2164
japanese bunching onion - monosomic addition lines - cepa l. - genetic analyses - aggregatum group - fistulosum - reveals - map - chromosomes - evolution
Background: Vegetables of the genus Allium are widely consumed but remain poorly understood genetically. Genetic mapping has been conducted in intraspecific crosses of onion (Allium cepa L.), A. fistulosum and interspecific crosses between A. roylei and these two species, but it has not been possible to access genetic maps and underlying data from these studies easily. Description: An online comparative genomics database, AlliumMap, has been developed based on the GMOD CMap tool at It has been populated with curated data linking genetic maps with underlying markers and sequence data from multiple studies. It includes data from multiple onion mapping populations as well as the most closely related species A. roylei and A. fistulosum. Further onion EST-derived markers were evaluated in the A. cepa x A. roylei interspecific population, enabling merging of the AFLP-based maps. In addition, data concerning markers assigned in multiple studies to the Allium physical map using A. cepa-A. fistulosum alien monosomic addition lines have been compiled. The compiled data reveal extensive synteny between onion and A. fistulosum. Conclusions: The database provides the first online resource providing genetic map and marker data from multiple Allium species and populations. The additional markers placed on the interspecific Allium map confirm the value of A. roylei as a valuable bridge between the genetics of onion and A. fistulosum and as a means to conduct efficient mapping of expressed sequence markers in Allium. The data presented suggest that comparative approaches will be valuable for genetic and genomic studies of onion and A. fistulosum. This online resource will provide a valuable means to integrate genetic and sequence-based explorations of Allium genomes.
Hoe overleeft de honingbij onze beschaving?
Blacquière, T. - \ 2010
De Levende Natuur 111 (2010)4. - ISSN 0024-1520 - p. 182 - 187.
bijenhouderij - apidae - populatie-ecologie - insect-plant relaties - bijensterfte - beekeeping - population ecology - insect plant relations - bee mortality
De afgelopen jaren waren er vaak berichten in de pers over de dramatische sterfte of verdwijning van bijenvolken (Benjamin & McCallum, 2009), zowel in Nederland als elders in Europa en ook in de Verenigde Staten. Dit artikel gaat in op de achteruitgang en problemen van de honingbij, tipt ook de andere bestuivende insecten aan en geeft een overzicht van de belangrijkste oorzaken van bijensterfte en achteruitgang van bestuivers.
Conversion of chromosome-specific RAPDs into SCAR-based anchor markers for onion linkage maps and its application to genetic analyses inother Allium species
Masuzaki, S. ; Miyazaki, T. ; McCallum, J. ; Heusden, A.W. van; Kik, C. ; Yamashita, K. ; Tashiro, Y. - \ 2008
Scientia Horticulturae 115 (2008)4. - ISSN 0304-4238 - p. 323 - 328.
amplified polymorphic dna - monosomic addition lines - l. aggregatum group - cepa l. - construction - assignment - sequences - aflp - locations - reveals
Integration of previously developed Allium cepa linkage maps requires the availability of anchor markers for each of the eight chromosomes of shallot (A. cepa L. common group Aggregatum). To this end, eight RAPD markers originating from our previous research were converted into SCAR markers via cloning and sequencing of RAPD amplicons and designing of 24-mer oligonucleotide primers. Of the eight pairs of SCAR primers, seven resulted in the amplification of single bands of the original RAPDs, and the remaining primer set amplified an additional band. The results of Southern hybridization using RAPD amplicons from genomic DNA of Japanese bunching onion (Allium fistulosum L.)¿shallot monosomic addition lines indicated that five SCAR markers were single shallot chromosome-specific markers and were not detected in genomic DNA of A. fistulosum. The eight SCAR primer pairs were applied to other Allium species and exhibited three types of amplification profiles, namely RAPD amplicons observed only in shallot, in shallot and Allium vavilovii, and in several Allium species. A mapping study using 65 F2 plants generated by the selfing of one interspecific cross A. cepa × Allium roylei individual integrated the SCAR marker SAOE17500 into chromosome 5 as expected. The results of the present study show that the eight SCAR primer sets specific to shallot can facilitate the mapping in A. cepa and can also serve as anchor points between maps of different Allium species
Regional Externalities
Heijman, W.J.M. - \ 2007
Berlin Heidelberg : Springer - ISBN 9783540354833 - 340
niet in de prijs doorberekende kosten - regionale ontwikkeling - regionale planning - regionaal beleid - transport - schaalvoordelen - milieu - regionale economie - externalities - regional development - regional planning - regional policy - economies of scale - environment - regional economics
The book offers practical and theoretical insights in regional externalities. Regional externalities are a specific subset of externalities that can be defined as externalities where space plays a dominant role. This class of externalities can be divided into three categories: (1) externalities related to mobility and transport; (2) external economies of scale and cluster effects, and (3) spatial environmental externalities. The book offers examples of the above mentioned categories. environment externalities mobility regional economics space Table of contents Acknowledgements.- Heijman, W.:Regional Externalities: an Introduction.- Larsen, M.M., Madsen, B., Jensen-Butler, C.: Modelling Transport in an Interregional General Equilibrium Model with Externalities.- Rouwendal, J.: External Effects in Road Traffic: the Pigou-Knight Model and its Extension to Situations With Endegenous Speed Choice and Heterogenous Traffic.- v. Mouche, P., Pijnappel, W., Rouwendal, J.: On Traffic Congestion Models à la Mohring and Harwitz.- Jaarsma, C.F., Heijman, W.: Local Collectors Versus Major Infrastructural Works.- Gašparikovà, J., Nemcová, E., Páleník, M.: Regional Differentiation and Location of Industrial Capacity in the Slovak Republik.- Brzica, D.: Automobile Sector in the Slovak Republic: Current Situation and Future Prospects.- Snieška, V., Virvilaité, R., Kvainauskaité, V., Neverauskas, B., Gatautis, R., Dovalienè, A.: IT Market and E-Commerce in Transition Economy: Network Externalities.- Burger, K., Haagsma, R.: International Outsourcing in the Netherlands.- Rutten, R., Boekema, F.: Regional Externalities and Clusters: a Dutch Network Case-Study.- Beckmann, V., Wesseler, J.: Spatial Dimension of Externalities and the Coase Theorem: Implications for Co-existence of Transgenic Crops.- Heijman, W., van Ophem, J.: Abatement of Commuting's Negative Externalities by Regional Investment in Houses and Buildings.- Beran, V.; Dlask, P.: Risk as an Externality in Quantitative and Marginal Approaches.- Johansen, S.: Macro Policies and Regional Impacts in Norway.- Benítez, P.C., McCallum, I., Obersteiner, M., Yamagata, Y.: The Economics of Tree-planting for Carbon Mitigation: A Global Assessment.- Ignaciuk, A.M.: Positive Spillovers of Energy Policies on Natural Areas in Poland: an AGE Analysis
Genetic mapping of a major gene affecting onion bulb fructan content
McCallum, J. ; Clarke, A. ; Pither-Joyce, M. ; Shaw, M. ; Butler, R. ; Brash, D. ; Scheffer, J. ; Sims, I. ; Heusden, A.W. van; Shigyo, M. ; Havey, M. - \ 2006
Theoretical and Applied Genetics 112 (2006)5. - ISSN 0040-5752 - p. 958 - 967.
allium-cepa l - nonstructural carbohydrate-composition - monosomic addition lines - soluble solids concentration - l.-aggregatum group - expressed sequence - extra chromosomes - fistulosum l. - heritability - traits
The non-structural dry matter content of onion bulbs consists principally of fructose, glucose, sucrose and fructans. The objective of this study was to understand the genetic basis for the wide variation observed in the relative amounts of these carbohydrates. Bulb carbohydrate composition was evaluated in progeny from crosses between high dry matter storage onion varieties and sweet, low dry matter varieties. When samples were analysed on a dry weight basis, reducing sugar and fructan content exhibited high negative correlations and bimodal segregation suggestive of the action of a major gene. A polymorphic SSR marker, ACM235, was identified which exhibited strong disequilibrium with bulb fructan content in F2:3 families from the `W202A¿ × `Texas Grano 438¿ mapping population evaluated in two environments. This marker was mapped to chromosome 8 in the interspecific population `Allium cepa × A. roylei¿. Mapping in the `Colossal Grano PVP¿ × `Early Longkeeper P12¿ F2 population showed that a dominant major gene conditioning high-fructan content lay in the same genomic region. QTL analysis of total bulb fructan content in the intraspecific mapping population `BYG15-23¿ × `AC43¿ using a complete molecular marker map revealed only one significant QTL in the same chromosomal region. This locus, provisionally named Frc, may account for the major phenotypic differences in bulb carbohydrate content between storage and sweet onion varieties
Towards a framework PCR-based map of onion (Allium cepa L.)
McCallum, J. ; Pither-Joyce, M. ; Clarke, A. ; Kik, C. ; Heusden, A.W. van; Jakse, J. ; Havey, M. - \ 2004
Acta Horticulturae 688 (2004). - ISSN 0567-7572 - p. 173 - 178.
Genetic analysis of onion has been hampered by a lack of portable co-dominant markers based on the polymerase chain reaction (PCR). The public release of a relatively large set of non-redundant onion expressed sequence tags (ESTs) in 2003 has provided the opportunity to develop such markers for use in Allium research and industry. We have mined this collection for simple sequence repeats (SSRs) and screened over 200 primer sets designed to flank SSRs for their ability to amplify low-copy polymorphic products in Allium cepa and A. roylei. Screening to date confirms that these are a rich source of polymorphic markers in Allium. Half of the sets reveal polymorphism between onion and A. roylei, ~40% reveal putative allelic variation in a small set of onion germplasm and 20% reveal polymorphism in a single F2 family in the cross `W202A¿ x `Texas Grano 438¿. Mapping common markers has permitted alignment with the RFLP map developed in the `Brigham Yellow Globe 15-23¿ x `Alisa Craig 43¿ population. Preliminary studies show these markers are effective in distinguishing variation in allelic diversity among a set of inbred and open-pollinated onion varieties. Our results suggest that these markers will enable effective genome scanning and analysis of genetic diversity and identity in cultivated onion.
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