Publication details
The More the Merrier: Recent Hybridization and Polyploidy in Cardamine
| Authors | |
|---|---|
| Year of publication | 2013 |
| Type | Article in Periodical |
| Magazine / Source | Plant Cell |
| MU Faculty or unit | |
| Citation | |
| web | http://www.plantcell.org/content/early/2013/09/30/tpc.113.114405.short?rss=1 |
| Doi | http://dx.doi.org/10.1105/tpc.113.114405 |
| Field | Genetics and molecular biology |
| Keywords | CHROMOSOME-NUMBER REDUCTION; MIXED-PLOIDY POPULATIONS; NUCLEAR RIBOSOMAL DNA; COMPARATIVE GENOMICS; ARABIDOPSIS-THALIANA; GENETIC-VARIATION; VASCULAR PLANTS; FLOW-CYTOMETRY; BRASSICACEAE; EVOLUTION |
| Attached files | |
| Description | This article describes the use of cytogenomic and molecular approaches to explore the origin and evolution of Cardamine schulzii, a textbook example of a recent allopolyploid, in its similar to 110-year history of human-induced hybridization and allopolyploidy in the Swiss Alps. Triploids are typically viewed as bridges between diploids and tetraploids but rarely as parental genomes of high-level hybrids and polyploids. The genome of the triploid semifertile hybrid Cardamine 3 insueta (2n = 24, RRA) was shown to combine the parental genomes of two diploid (2n = 2x = 16) species, Cardamine amara (AA) and Cardamine rivularis (RR). These parental genomes have remained structurally stable within the triploid genome over the > 100 years since its origin. Furthermore, we provide compelling evidence that the alleged recent polyploid C. schulzii is not an autohexaploid derivative of C. x insueta. Instead, at least two hybridization events involving C. x insueta and the hypotetraploid Cardamine pratensis (PPPP, 2n = 4x-2 = 30) have resulted in the origin of the trigenomic hypopentaploid (2n = 5x22 = 38, PPRRA) and hypohexaploid (2n = 6x-2 = 46, PPPPRA). These data show that the semifertile triploid hybrid can promote a merger of three different genomes and demonstrate how important it is to reexamine the routinely repeated textbook examples using modern techniques. |
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