Journal ArticleDOI
A phylogenetic tree of nematodes based on about 1200 full-length small subunit ribosomal DNA sequences.
Hanny van Megen,Sven van den Elsen,Martijn Holterman,Gerrit Karssen,Paul Mooyman,Tom Bongers,Oleksandr Holovachov,Jaap Bakker,Johannes Helder +8 more
TLDR
The extensiveness of convergent evolution is one of the most striking phenomena observed in the phylogenetic tree presented here – it is hard to find a morphological, ecological or biological characteristic that has not arisen at least twice during nematode evolution.Abstract:
As a result of the scarcity of informative morphological and anatomical characters, nematode systematics have always been volatile. Differences in the appreciation of these characters have resulted in numerous classifications and this greatly confuses scientific communication. An advantage of the use of molecular data is that it allows for an enormous expansion of the number of characters. Here we present a phylogenetic tree based on 1215 small subunit ribosomal DNA sequences (ca 1700 bp each) covering a wide range of nematode taxa. Of the 19 nematode orders mentioned by De Ley et al. (2006) 15 are represented here. Compared with Holterman et al. (2006) the number of taxa analysed has been tripled. This did not result in major changes in the clade subdivision of the phylum, although a decrease in the number of well supported nodes was observed. Especially at the family level and below we observed a considerable congruence between morphology and ribosomal DNA-based nematode systematics and, in case of discrepancies, morphological or anatomical support could be found for the alternative grouping in most instances. The extensiveness of convergent evolution is one of the most striking phenomena observed in the phylogenetic tree presented here - it is hard to find a morphological, ecological or biological characteristic that has not arisen at least twice during nematode evolution. Convergent evolution appears to be an important additional explanation for the seemingly persistent volatility of nematode systematics.read more
Citations
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Journal ArticleDOI
Top 10 plant-parasitic nematodes in molecular plant pathology
John T. Jones,Annelies Haegeman,Etienne Danchin,H. S. Gaur,Johannes Helder,Michael G. K. Jones,Taisei Kikuchi,Rosa H. Manzanilla-López,Juan E. Palomares-Rius,Wim Wesemael,Roland N. Perry,Roland N. Perry +11 more
TL;DR: The aim of this review was to undertake a survey of researchers working with plant-parasitic nematodes in order to determine a 'top 10' list of these pathogens based on scientific and economic importance.
Top 10 plant parasitic nematodes in molecular plant pathology in (Abstracts from the 6th International Congress of Nematology, Cape Town, South Africa, 4-9 May 2014)
John T. Jones,Annelies Haegeman,Etienne Danchin,H. S. Gaur,Johannes Helder,Michael G. K. Jones,T. Kikuchi,Rosa H. Manzanilla-López,Juan E. Palomares-Rius,Wim Wesemael,Roland N. Perry +10 more
Journal ArticleDOI
Genomic insights into the origin of parasitism in the emerging plant pathogen Bursaphelenchus xylophilus.
Taisei Kikuchi,James Cotton,Jonathan J. Dalzell,Koichi Hasegawa,Natsumi Kanzaki,Paul McVeigh,Takuma Takanashi,Isheng J. Tsai,Samuel Assefa,Peter J. A. Cock,Thomas D. Otto,Martin Hunt,Adam J. Reid,Alejandro Sanchez-Flores,Kazuko Tsuchihara,Toshiro Yokoi,Mattias C. Larsson,Mattias C. Larsson,Johji Miwa,Aaron G. Maule,Norio Sahashi,John T. Jones,Matthew Berriman +22 more
TL;DR: A high-quality draft genome sequence from an inbred line of B. xylophilus is presented, and the lack of proteins homologous to effectors from other plant parasitic nematodes confirms the distinctive molecular basis of plant parasitism in the Bursaphelenchus lineage.
Journal ArticleDOI
Major emerging problems with minor meloidogyne species.
TL;DR: The aim of this review is to draw attention to previously neglected and newly described Meloidogyne spp.
Journal ArticleDOI
The evolution of parasitism in Nematoda.
TL;DR: Nematode genomes show evidence of horizontal gene transfer from other members of the rhizosphere, and these genes play important roles in the parasite-host interface, but similar horizontal transfer is not evident in animal parasitic groups.
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