Fig. 1

Phylogenetic relationships and comparative genomic analyses. a Phylogenetic relationships and number of gene families displaying expansion and contraction. b Comparison of the number of gene families in the five land plants Ginkgo biloba, Cycacs revoluta, Pinus canariensis, Selaginella moellendorffii and Arabidopsis thaliana. c Comparison of the longest 10% of introns in the five land plants. d Phylogenetic tree of three orthologous gene families indicating gene duplication and tandem distribution. The colors of solid circles represent species. Gene IDs of ginkgo start with ‘Gb’, and red and green text represents tandem distribution in different scaffolds. CREV, C. revoluta, PCAN, P. canariensis, SMOE, S. moellendorffii, OSAT, O. sativa, ATHA, A. thaliana