History, protohistory and prehistory of the Arabidopsis thaliana chromosome complement.
We propose an evolutionary scenario that could have shaped the modern Arabidopsis thaliana genome, which began with the reduction in chromosome number from n=8 to n=5 in the past 4 million to 5 million years as a result of chromosome fusion. The scenario also includes three ancient polyploidizations: the most recent occurred in an early Brassicaceae with n=4 chromosomes 24 million to 40 million years ago. The two other polyploidizations occurred after the emergence of the Eudicots and the Angiosperms, respectively. Angiosperm evolution includes recurrent cycles of genome duplication and gene and chromosome reorganizations.
Henry
Yves
Y
Laboratoire Cycle Cellulaire et Développement, IBP, Bâtiment 630, UMR 8618, Université Paris-Sud, 91405 Orsay, France. henry@ibp.u-psud.fr
Bedhomme
Mariette
M
Blanc
Guillaume
G
D017360:Arabidopsis / Q000235:genetics*; D032461:Chromosomes, Plant; D019143:Evolution, Molecular; D018745:Genome, Plant; D011123:Polyploidy