Cytogenetics
Genome size, ploidal level and chromosome numbers
The “Cytogenetics Tool” offers the search for currently available data on genome size, chromosome numbers, and ploidal level, and currently ca. 10% and 50%, respectively, out of the 4148 species from the Brassicaceae are incorporated in BrassiBase for genome size and chromosome numbers, respectively. Actually, the search is restricted to species and genera. With the current version we also included all report from IOPB chromosome number reports until early 2025.
The output table also provide an assessment about diploid and polyploid taxa. Polyploidy is further defined as meso, mesoneo- and neopolyploids (Lysak and Koch, 2011)
- Lysak, MA., Koch MA (2011) Phylogeny, Genome and Karyotype Evolution of Crucifers (Brassicaceae). In: Genetics and Genomics of the Brassicaceae (eds. R. Schmidt, I. Bancroft). Springer Verlag, New York.
Neopolyploidy: "A recent whole genome duplication event (WGD) via auto- or allopolyploidization."
- Lysak A und Koch MA (2011) Phylogeny, Genome, and Karyotype Evolution of Crucifers (Brassicaceae). In: R. Schmidt; I. Bancraft (eds.) Genetics and Genomics of the Brassicaceae pp. 1-33. Springer New York, Dordrecht, Heidelberg, London
"Mesopolyploidy: A not recent whole genome duplication event (WGD) that followed the early (paleoploid) WGD at the origin of the whole Brassicaceae family. Mesopolyploid species exhibit diploid-like meiosis, disomic inheritance, and diploidized genomes up to quasidiploid complements with a very low number of chromosomes. However, the parental subgenomes are still discernible by comparative (cyto)genetic and phylogenetic methods."
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