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Genes 2017, 8(3), 103; doi:10.3390/genes8030103

The Complete Chloroplast Genome Sequences of Six Rehmannia Species

Key Laboratory of Resource Biology and Biotechnology in Western China (Ministry of Education), College of Life Science, Northwest University, Xi’an, 710069, China
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Academic Editor: Charles Bell
Received: 12 January 2017 / Revised: 4 March 2017 / Accepted: 9 March 2017 / Published: 15 March 2017
(This article belongs to the Section Plant Genetics and Genomics)
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Abstract

Rehmannia is a non-parasitic genus in Orobanchaceae including six species mainly distributed in central and north China. Its phylogenetic position and infrageneric relationships remain uncertain due to potential hybridization and polyploidization. In this study, we sequenced and compared the complete chloroplast genomes of six Rehmannia species using Illumina sequencing technology to elucidate the interspecific variations. Rehmannia plastomes exhibited typical quadripartite and circular structures with good synteny of gene order. The complete genomes ranged from 153,622 bp to 154,055 bp in length, including 133 genes encoding 88 proteins, 37 tRNAs, and 8 rRNAs. Three genes (rpoA, rpoC2, accD) have potentially experienced positive selection. Plastome size variation of Rehmannia was mainly ascribed to the expansion and contraction of the border regions between the inverted repeat (IR) region and the single-copy (SC) regions. Despite of the conserved structure in Rehmannia plastomes, sequence variations provide useful phylogenetic information. Phylogenetic trees of 23 Lamiales species reconstructed with the complete plastomes suggested that Rehmannia was monophyletic and sister to the clade of Lindenbergia and the parasitic taxa in Orobanchaceae. The interspecific relationships within Rehmannia were completely different with the previous studies. In future, population phylogenomic works based on plastomes are urgently needed to clarify the evolutionary history of Rehmannia. View Full-Text
Keywords: Rehmannia; chloroplast genome; repeat; positive selection; phylogeny Rehmannia; chloroplast genome; repeat; positive selection; phylogeny
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Zeng, S.; Zhou, T.; Han, K.; Yang, Y.; Zhao, J.; Liu, Z.-L. The Complete Chloroplast Genome Sequences of Six Rehmannia Species. Genes 2017, 8, 103.

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