Insights in the evolution of plant parasitism within the phylum Nematoda based on neutral and pathogenicity-related genes.

J. Helder, S.J.J. van den Elsen, P.J.W. Mooijman, K. Rybarczyk-Mydlowska, R. Landeweert, A. Goverse

Research output: Chapter in Book/Report/Conference proceedingAbstract

Abstract

Plant parasitism has arisen at least four times independently within the phylum Nematoda. As a starting point to reconstruct evolution of parasitism within this ubiquitous and diverse group of animals, we use (nearly full length) small subunit ribosomal DNA (SSU rDNA) sequences (˜ 1,700 bp). Currently this phylum-wide framework encompasses over 2,500 taxa, and phylogenetic analysis reveals relationships within and among these four major lineages. Remarkably, SSU rDNA - known as a conserved gene - shows accelerated evolution in case of branches dominated by taxa with short life cycles, and/or animal or plant-parasitic life styles. One of the practical implications of this characteristic is the availability of unique DNA motifs within this gene that allows for relatively straightforward high-throughput detection of plant-parasitic nematode species in complex (= environmental) samples. Currently over 30 tests have been developed including most of the high-impact root knot, cyst and lesion nematode species attacking both Solanaceous and/or cereal crops. In parallel we investigated relationships within individual lineages of plant-parasitic nematodes with regard to non-neutral, plant pathogenicity-related genes, and by doing so we tried to find clues about the role of horizontal gene transfer in the transition from bacterivores (ancestral state) towards fungivores and facultative & obligate plant parasites (most derived state). Analysis of distribution and diversity of cell wall-degrading enzymes suggest for a very early acquisition, and subsequent diversification, and it would be highly interesting to look for related patterns in effector evolution.
Original languageEnglish
Title of host publicationProceedings of 1st Annual Meeting, COST FA 1208, 09-11 October 2013, Birnam, Scotland
Pages54-54
Publication statusPublished - 2013
EventCOST FA 1208, Pathogen-informed strategies for sustainable broad-spectrum crop resistancem Birnam, Scotland -
Duration: 9 Oct 201311 Oct 2013

Conference

ConferenceCOST FA 1208, Pathogen-informed strategies for sustainable broad-spectrum crop resistancem Birnam, Scotland
Period9/10/1311/10/13

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    Helder, J., van den Elsen, S. J. J., Mooijman, P. J. W., Rybarczyk-Mydlowska, K., Landeweert, R., & Goverse, A. (2013). Insights in the evolution of plant parasitism within the phylum Nematoda based on neutral and pathogenicity-related genes. In Proceedings of 1st Annual Meeting, COST FA 1208, 09-11 October 2013, Birnam, Scotland (pp. 54-54)