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. 2016 May 24;7:697. doi: 10.3389/fpls.2016.00697

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Copyright © 2016 Lemieux, Otis and Turmel.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Gene partitioning patterns of streptophyte chloroplast genomes. For each genome, one copy of the IR (thick vertical lines) and the entire SSC and LSC regions are represented. The five genes composing the rDNA operon are highlighted in yellow. The color assigned to each of the remaining genes is dependent upon the position of the corresponding gene relative to the rDNA operon in the cpDNA of the streptophyte alga Mesostigma viride, a genome displaying an ancestral gene partitioning pattern. The genes highlighted in orange are found within or near the SSC region in this streptophyte genome (downstream of the rDNA operon), whereas those highlighted in blue are found within or near the LSC region (upstream of the rDNA operon). To simplify the comparison of gene order, some genomes are represented in their alternative isomeric forms relative to the genome sequences deposited in GenBank. Note that the trnK(cuu) genes of Mesotaenium and Closterium, and the trnV(aac) gene of Physcomitrella were not color-coded because their evolutionary origins are unclear.