Peaceful revolution in genome size: polyploidy in the Nabidae (Heteroptera); autosomes and nuclear DNA content doubling
| Autor: | David Sadílek, Tomáš Urfus, Jitka Vilímová |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
0301 basic medicine Autosome Heteroptera Biodiversity Biology biology.organism_classification 010603 evolutionary biology 01 natural sciences Nuclear DNA 03 medical and health sciences 030104 developmental biology Evolutionary biology Nabidae Animal Science and Zoology Genome size Ecology Evolution Behavior and Systematics Taxonomy |
| Zdroj: | Zoological Journal of the Linnean Society. 193:145-157 |
| ISSN: | 1096-3642 0024-4082 |
| DOI: | 10.1093/zoolinnean/zlaa138 |
| Popis: | Genome size and the position of 18S ribosomal DNA (rDNA) were analysed in two Himacerus, eight Nabis and two Prostemma species from the family Nabidae using flow cytometry and fluorescence in situ hybrization techniques. The karyotypes of Nabis biformis and Nabis maoricus, each with 2n = 16 + XY, and Prostemma aeneicolle, with 2n = 26 + XY, were recorded for the first time. All the species displayed one or two 18S rDNA signals on the X chromosome and up to two signals on the Y chromosome. Several females exhibited two different types of X chromosome breakage, namely within or outside of the 18S rDNA region. Measurements of nuclear DNA content revealed significant differences between all three genera under study. Most notably, the nuclear DNA content of Himacerus species, with 2n = 32/36 + XY (2C = 9–10 pg), was double that of Nabis species, with 2n = 16 + XY (2C = 4–6 pg). Therefore, the previously rejected theory of an autosomal polyploidy event in the evolution of the genus Himacerus is strongly supported by the results of the present study and is now being resurrected. |
| Databáze: | OpenAIRE |
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