Figure 1.

Genomic features of P. globosa and comparative analysis of P. globosa and other algal species

(A) Genomic landscape of the 23 chromosomes of the P. globosa genome assembled in this project. Track a represents 23 P globosa chromosomes (Mb); Tracks b–d represent distribution of gene density, repeat element density, and GC content, respectively (bin size = 100k); Track e represents syntenic blocks in the P. globosa genome.

(B) Distribution of nine copies of ribosomal operons in chromosomes PglChr23 (eight copies) and PglChr16 (one single copy). Each copy consisted of an 18S rDNA, an internal transcribed spacer (ITS, including 5.8S rDNA), a 28S rDNA, and an IGS. Two adjacent copies are separated by a genomic sequence of various lengths.

(C) Divergence distribution of transposable elements.

(D) Whole genome duplication (WGD) events are estimated from the 4-fold degenerate synonymous sites of the third codons (4DTv) distance of homologous pairs in syntenic regions of P. globosa.

(E) Venn diagram for orthologous protein-coding gene clusters in P. globosa, C. tobin, G. theta, and C. merolae.

(F) Evolutionary analysis of single copy genes in P. globosa and selected species.