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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Genetic and molecular analysis of trichome development in Arabis alpina
Chopra, Divykriti ; Mapar, Mona ; Stephan, Lisa ; Albani, Maria C. ; Deneer, Anna ; Coupland, George ; Willing, Eva Maria ; Schellmann, Swen ; Schneeberger, Korbinian ; Fleck, Christian ; Schrader, Andrea ; Hülskamp, Martin - \ 2019
Proceedings of the National Academy of Sciences of the United States of America 116 (2019)24. - ISSN 0027-8424 - p. 12078 - 12083.
Arabis alpina - Genetic analysis - Trichomes

The genetic and molecular analysis of trichome development in Arabidopsis thaliana has generated a detailed knowledge about the underlying regulatory genes and networks. However, how rapidly these mechanisms diverge during evolution is unknown. To address this problem, we used an unbiased forward genetic approach to identify most genes involved in trichome development in the related crucifer species Arabis alpina. In general, we found most trichome mutant classes known in A. thaliana. We identified orthologous genes of the relevant A. thaliana genes by sequence similarity and synteny and sequenced candidate genes in the A. alpina mutants. While in most cases we found a highly similar gene-phenotype relationship as known from Arabidopsis, there were also striking differences in the regulation of trichome patterning, differentiation, and morphogenesis. Our analysis of trichome patterning suggests that the formation of two classes of trichomes is regulated differentially by the homeodomain transcription factor AaGL2. Moreover, we show that overexpression of the GL3 basic helix–loop–helix transcription factor in A. alpina leads to the opposite phenotype as described in A. thaliana. Mathematical modeling helps to explain how this nonintuitive behavior can be explained by different ratios of GL3 and GL1 in the two species.

Monitoring and mapping with robot swarms for agricultural applications
Albani, Dario ; Ijsselmuiden, Joris ; Haken, Ramon ; Trianni, Vito - \ 2017
In: 2017 14th IEEE International Conference on Advanced Video and Signal Based Surveillance, AVSS 2017. - Institute of Electrical and Electronics Engineers Inc. - ISBN 9781538629390
Robotics is expected to play a major role in the agricultural domain, and often multi-robot systems and collaborative approaches are mentioned as potential solutions to improve efficiency and system robustness. Among the multi-robot approaches, swarm robotics stresses aspects like flexibility, scalability and robustness in solving complex tasks, and is considered very relevant for precision farming and large-scale agricultural applications. However, swarm robotics research is still confined into the lab, and no application in the field is currently available. In this paper, we describe a roadmap to bring swarm robotics to the field within the domain of weed control problems. This roadmap is implemented within the experiment SAGA, founded within the context of the ECORD++ EU Project. Together with the experiment concept, we introduce baseline results for the target scenario of monitoring and mapping weed in a field by means of a swarm of UAVs.
Genome expansion of Arabis alpina linked with retrotransposition and reduced symmetric DNA methylation
Willing, Eva Maria ; Rawat, Vimal ; Mandáková, Terezie ; Maumus, Florian ; James, Geo Velikkakam ; Nordström, Karl J.V. ; Becker, Claude ; Warthmann, Norman ; Chica, Claudia ; Szarzynska, Bogna ; Zytnicki, Matthias ; Albani, Maria C. ; Kiefer, Christiane ; Bergonzi, Sara ; Castaings, Loren ; Mateos, Julieta L. ; Berns, Markus C. ; Bujdoso, Nora ; Piofczyk, Thomas ; Lorenzo, Laura De; Barrero-Sicilia, Cristina ; Mateos, Isabel ; Piednoël, Mathieu ; Hagmann, Jörg ; Chen-Min-Tao, Romy ; Iglesias-Fernández, Raquel ; Schuster, Stephan C. ; Alonso-Blanco, Carlos ; Roudier, François ; Carbonero, Pilar ; Paz-Ares, Javier ; Davis, Seth J. ; Pecinka, Ales ; Quesneville, Hadi ; Colot, Vincent ; Lysak, Martin A. ; Weigel, Detlef ; Coupland, George ; Schneeberger, Korbinian - \ 2015
Nature Plants 1 (2015). - ISSN 2055-026X - 7 p.
Despite evolutionary conserved mechanisms to silence transposable element activity, there are drastic differences in the abundance of transposable elements even among closely related plant species. We conducted a de novo assembly for the 375 .Mb genome of the perennial model plant, Arabis alpina. Analysing this genome revealed long-lasting and recent transposable element activity predominately driven by Gypsy long terminal repeat retrotransposons, which extended the low-recombining pericentromeres and transformed large formerly euchromatic regions into repeat-rich pericentromeric regions. This reduced capacity for long terminal repeat retrotransposon silencing and removal in A. alpina co-occurs with unexpectedly low levels of DNA methylation. Most remarkably, the striking reduction of symmetrical CG and CHG methylation suggests weakened DNA methylation maintenance in A. alpina compared with Arabidopsis thaliana. Phylogenetic analyses indicate a highly dynamic evolution of some components of methylation maintenance machinery that might be related to the unique methylation in A. alpina.
Modelling forest growth and competition
Kramer, K. ; Werf, B. van der; Albani, M. ; Wyngaert, I.J.J. van den; Magnani, F. - \ 2004
In: Effects of silvicultural regimes on dynamics of genetic and ecological diversity of European beech forests; impact assessment and recommendations for sustainable forestry / Kramer, K., [S.l.] : S.n. - p. 175 - 195.
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