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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Record number 550025
Title Convergent evolution of plant parasitism among nematodes, and the relevance of comparative genomics to improve our understanding of (in)compatible host-parasite interactions
Author(s) Steenbrugge, Joris van; Holterman, M.H.M.; Sterken, M.G.; Elsen, S.J.J. van den; Smant, G.; Helder, J.
Event Agrifor 2019, Marmaris, 2019-04-08/2019-04-10
Department(s) Laboratory of Nematology
Publication type Abstract in scientific journal or proceedings
Publication year 2019
Abstract Parasitism is a wanted life strategy among nematodes: among the  16,000 described terrestrial species about 25% parasitizes plants, and another 25% animals. Plant parasitism has arisen independently in four different major clades, and even within individual clades plant parasitism arose multiple times. Massive convergent evolution combined with a limited number of informative morphological characters made it nearly impossible to robustly deduce systematic relationships. Wide-scale use of multiple molecular markers allowed for the generation of a more stable overall framework, and currently we have a reasonably good idea about inter-clade and intra-clade relationships among plant parasitic nematodes. Among the 4,100 described plant parasites slightly more than a dozen species are responsible for the major part of the economic losses (worldwide estimated at about €110 billion annually). Here, we will pinpoint the phylogenetic relationships between these high-impact species mainly based on small subunit (SSU) ribosomal DNA sequences. In a next step, we generated PacBio-based reference genomes for a number of major cyst and root knot nematode species to serve as a reference for comparison of re-sequenced field populations. We are currently investigating whether genetic variants can be found that are associated with (a)virulence vis-à-vis a given resistance (R) gene included in crop cultivars. Most R proteins are activated by effector variants present in a subset of the populations of a given species only. We are currently investigating whether effector variants (or tightly associated markers) can be found that are associated with (a)virulence. To illustrate our approach, progress on the effectiveness of resistant potato varieties in relation to the genetic constitution of potato cyst nematode populations will be presented.
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