Distribution of basic genomic elements of pear. (A) Chromosome karyotype. Colored segments are in accordance with the Rosaceous ancestor. (B) Gene density. The rate of sites within gene region per 100 kb ranges from a minimum of 0 to a maximum of 0.8, illustrated by red line. (C) DNA transposon element (TE) density. The rate of sites within the DNA TE region per 100 kb ranges from 0 to 0.65, illustrated by blue line. (D) Retrotransposon element (RT TE) density. The rate of sites within the RT TE regions ranges from 0 to 1, illustrated by purple. (E) SNP density. The rate of SNP per 100 kb ranges from 0 to 0.03, illustrated by green. (F) GC content. The rate of GC content ranges from 0.25 to 0.45, illustrated by black. Circos (Krzywinski et al. 2009) (http://circos.ca) was used for constructing this diagram.
