Fig 1.
KS age distributions for Ginkgo biloba and Encephalartos natalensis transcriptomes.
The red graph represents the age distribution of duplicates (in the transcriptome) of G. biloba, while the blue graph represents the age distribution of duplicates of E. natalensis. The graph in grey denotes the KS distribution for one-to-one orthologs of G. biloba and E. natalensis.
Fig 2.
Possible locations for the whole genome duplication uncovered for Encephalartos natalensis and Ginkgo biloba.
Cycad and ginkgo share a common ancestor and are sister to the ancestor of Gnetales and conifers [17, 30, 34, 35, 37, 39]: the inferred polyploidy event could have occurred in the common ancestor of the cycad and gingko lineages (red square), the gymnosperm ancestor (green square), or in the seed plant ancestor (blue square). Note that the position of Gnetales remains uncertain (see text for details).