1. Evolution of the gall-forming plant parasitic nematodes (Tylenchida: Anguinidae) and their relationships with hosts as inferred from Internal Transcribed Spacer sequences of nuclear ribosomal DNA.
- Author
-
Subbotin SA, Krall EL, Riley IT, Chizhov VN, Staelens A, De Loose M, and Moens M
- Subjects
- Animals, Base Sequence, Cell Nucleus genetics, DNA, Helminth isolation & purification, Nematoda genetics, Plant Diseases parasitology, Polymerase Chain Reaction methods, Sequence Alignment, Sequence Homology, Nucleic Acid, DNA, Helminth genetics, DNA, Ribosomal Spacer genetics, Evolution, Molecular, Nematoda classification, Nematoda pathogenicity, Phylogeny, Plants parasitology, Transcription, Genetic
- Abstract
Phylogenetic relationships among gall-forming plant parasitic nematodes of the subfamily Anguininae are reconstructed by maximum parsimony and maximum likelihood analyses. Sequences of the ITS of rDNA from 53 populations and species of gall-forming nematodes and five populations of the Ditylenchus dipsaci species complex were analysed. The phylogenetic trees strongly support monophyly of the genus Anguina and show nonmonophyly for the genera Mesoanguina and Heteroanguina. Morphological and biological characters are generally congruent with the anguinid groups identified in the rDNA phylogeny. Analyses of evolution of different gall types among anguinids reveal that there are apparent evolutionary trends in gall evolution: from abnormal swelling and growth of infested plant organs toward small localised galls, and from infestation of vegetative toward generative organs. Our study demonstrates that the main anguinid groups are generally associated with host plants belonging to the same or related systematic groups. The comparison of the ITS phylogenies of anguinids parasitising Poaceae and their host grasses shows a high level of cospeciation events.
- Published
- 2004
- Full Text
- View/download PDF