Fig. 2
From: Parallel evolution of highly conserved plastid genome architecture in red seaweeds and seed plants
Synteny analysis and proposed evolutionary pathway for generating the three types of plastid genomes. a Syntenic differences between the three types of plastid genome structure in the Florideophyceae and comparison with the R1-type plastid genome in Bangiophyceae. Asterisks (*) indicate variable sites due to gene loss or pseudogenization. The chlL and chlN genes are present only in the plastid genomes of the subclass Nemaliophycidae. b Proposed evolutionary pathway for generating the three plastid genome types in Florideophyceae. The green circles indicate the plastid genome and the red and pink rectangular boxes show the rDNA operon(s). The number of species containing duplicated rDNAs, semi-duplicated rDNAs, and single rDNA operons are shown in parentheses