Genomic features of rDNA loci. (A) Genomic locations of nuclear rDNA genes. The size of the contigs is proportional to their length, but different scales are used for contigs ctg_1 to ctg_17 and for contigs ctg_19 to ctg_29. The length of each contig is reported below its name. (B) Self-alignment of ctg_19 as an example of the 45S rDNA locus structure. (C) Simplified structure of 45S rDNA loci; the length of the blocks is not proportional to their actual length. (IR) Inverted repeat, (DR) direct repeat, (IGS) intergenic spacer, and (ITS1 and ITS2) internal transcribed spacers. (D) Alignment of 45S rDNA loci from 18S to 28S. Red lines highlight nucleotides that differ from the consensus sequence. The names of each locus reflect the naming system used in panel A. (E) Same as D, but for 5S rDNA genes.