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Fig. 6 | Genome Biology

Fig. 6

From: The Aquilegia genome reveals a hybrid origin of core eudicots

Fig. 6

Tracing the genome reshuffling in columbine following tetraploidy. Grape chromosomes (bottom right) are colored by within-genome synteny. Seven distinct colors represent the haploid set of seven ancestral chromosomes before the eudicot-wide WGD. Each color is shared by three grape chromosomes reflecting the triplicate genome structure of core eudicots. The only exception is the “green” chromosome which is shared by four grape chromosomes due to a fission event [38]. Columbine chromosomes (bottom left) are colored by their synteny to grape chromosomes. Each color is generally shared by two chromosomes, reflecting columbine paleotetraploidy. As few as 7 fusions and a single fission are enough to explain the current structure of the columbine genome. Of these 7 fusions, 5 are between different chromosomes while 2 are between WGD-derived paralogous chromosomes. Columbine chromosomes 3 and 7 are examples of the latter (Fig. 1 and Additional file 1: Figure S4). Note that chromosome 5 of columbine and chromosome 7 of grape (*) both have the colors “orange” and “green” (cf. Fig. 7)

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