Mitochondrial DNA sequence divergence among greenbug (Homoptera: Aphididae) biotypes: evidence for host-adapted races
| Autor: | James A. Anstead, John D. Burd, K. A. Shufran, G. Lushai |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Homoptera
Molecular Sequence Data Adaptation Biological Genes Insect Poaceae DNA Mitochondrial Host-Parasite Interactions Electron Transport Complex IV Phylogenetics Botany Genetics Animals Schizaphis rotundiventris Clade Molecular Biology Phylogeny Likelihood Functions Phylogenetic tree biology Aphididae biology.organism_classification Maximum parsimony Aphids Insect Science Molecular phylogenetics |
| Zdroj: | Insect Molecular Biology. 9:179-184 |
| ISSN: | 1365-2583 0962-1075 |
| Popis: | The full complement of known greenbug, Schizaphis graminum (Rondani), biotypes found in the USA were subjected to a molecular phylogenetic analysis based on a 1.2-kb portion of the cytochrome oxidase I mitochondrial gene. In addition to these nine biotypes (B, C, E, F, G, H, I, J and K), a probable isolate of the enigmatic biotype A (NY), a 'new biotype' collected from Elymus canadensis (L.) (CWR), and an isolate from Germany (EUR) were included. Schizaphis rotundiventris (Signoret) was included as an outgroup. Genetic distances among S. graminum biotypes ranged from 0.08% to 6.17% difference in nucleotide substitutions. Neighbour-joining, maximum parsimony and maximum likelihood analyses all produced dendrograms revealing three clades within S. graminum. Clade 1 contained the 'agricultural' biotypes commonly found on sorghum and wheat (C, E, K, I, plus J) and there were few substitutions among these biotypes. Clade 2 contained F, G and NY, and Clade 3 contained B, CWR and EUR, all of which are rarely found on crops. The rarest biotype, H, fell outside the above clades and may represent another Schizaphis species. S. graminum biotypes are a mixture of genotypes belonging to three clades and may have diverged as host-adapted races on wild grasses. |
| Databáze: | OpenAIRE |
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