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. 2016 Sep 2;14:75. doi: 10.1186/s12915-016-0299-5

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© Yoon et al. 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — 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