Editing Arabidopsis (section)

==Cytogenetics==
[[Cytogenetics|Cytogenetic]] analysis has shown the [[haploid]] [[chromosome]] number (n) is variable and varies across species in the genus:<ref name=Al2002/>

''A. thaliana'' is n=5<ref>{{cite journal|doi=10.1073/pnas.0510791103|pmid=16549785|title=Mechanisms of chromosome number reduction in ''Arabidopsis thaliana'' and related Brassicaceae species|journal=Proceedings of the National Academy of Sciences|volume=103|issue=13|pages=5224–5229|year=2006|last1=Lysak|first1=M. A|last2=Berr|first2=A|last3=Pecinka|first3=A|last4=Schmidt|first4=R|last5=McBreen|first5=K|last6=Schubert|first6=I|bibcode=2006PNAS..103.5224L|pmc=1458822|doi-access=free}}</ref> and the [[DNA sequencing]] of this species was completed in 2001. ''A. lyrata'' has n=8 but some subspecies or populations are tetraploid.<ref>{{cite journal|doi=10.1139/b03-134|title=Characterizing polyploidy in ''Arabidopsis lyrata'' using chromosome counts and flow cytometry|journal=Canadian Journal of Botany|volume=82|issue=2|pages=185|year=2004|last1=Dart|first1=Sara|last2=Kron|first2=Paul|last3=Mable|first3=Barbara K}}</ref> Various subspecies ''A. arenosa'' have n=8 but can be either 2n (diploid) or 4n (tetraploid).<ref name=plos>{{cite journal|last1=Joly|first1=Simon|last2=Schmickl|first2=Roswitha|last3=Paule|first3=Juraj|last4=Klein|first4=Johannes|last5=Marhold|first5=Karol|last6=Koch|first6=Marcus A.|title=The Evolutionary History of the ''Arabidopsis arenosa'' Complex: Diverse Tetraploids Mask the Western Carpathian Center of Species and Genetic Diversity|journal=PLOS ONE|volume=7|issue=8|year=2012|pages=e42691|issn=1932-6203|doi=10.1371/journal.pone.0042691|bibcode=2012PLoSO...742691S|pmid=22880083|pmc=3411824|doi-access=free}}</ref>
''A. suecica'' is n=13 (5+8) and is an [[Polyploidy|amphidiploid]] species originated through hybridization between ''A. thaliana'' and diploid ''A. arenosa''.<ref>{{cite journal|doi=10.1093/molbev/msk006|pmid=16549398|title=A Unique Recent Origin of the Allotetraploid Species ''Arabidopsis suecica'': Evidence from Nuclear DNA Markers|journal=Molecular Biology and Evolution|volume=23|issue=6|pages=1217–31|year=2006|last1=Jakobsson|first1=Mattias|last2=Hagenblad|first2=Jenny|last3=Tavaré|first3=Simon|last4=SäLl|first4=Torbjörn|last5=Halldén|first5=Christer|last6=Lind-Halldén|first6=Christina|last7=Nordborg|first7=Magnus|doi-access=free}}</ref>

''A. neglecta'' is n=8, as are the various subspecies of ''A. halleri''.<ref name=plos />

As of 2005, ''A. cebennensis'', ''A. croatica'' and ''A. pedemontana'' have not been investigated cytologically.