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Int. J. Mol. Sci. 2018, 19(1), 319;

Comparative Genomics of the Balsaminaceae Sister Genera Hydrocera triflora and Impatiens pinfanensis

Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China
University of Chinese Academy of Sciences, Beijing 100049, China
Sino-African Joint Research Center, Chinese Academy of Sciences, Wuhan 430074, China
These authors contributed equally to these work.
Authors to whom correspondence should be addressed.
Received: 21 December 2017 / Revised: 13 January 2018 / Accepted: 15 January 2018 / Published: 23 January 2018
(This article belongs to the Special Issue Chloroplast)
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The family Balsaminaceae, which consists of the economically important genus Impatiens and the monotypic genus Hydrocera, lacks a reported or published complete chloroplast genome sequence. Therefore, chloroplast genome sequences of the two sister genera are significant to give insight into the phylogenetic position and understanding the evolution of the Balsaminaceae family among the Ericales. In this study, complete chloroplast (cp) genomes of Impatiens pinfanensis and Hydrocera triflora were characterized and assembled using a high-throughput sequencing method. The complete cp genomes were found to possess the typical quadripartite structure of land plants chloroplast genomes with double-stranded molecules of 154,189 bp (Impatiens pinfanensis) and 152,238 bp (Hydrocera triflora) in length. A total of 115 unique genes were identified in both genomes, of which 80 are protein-coding genes, 31 are distinct transfer RNA (tRNA) and four distinct ribosomal RNA (rRNA). Thirty codons, of which 29 had A/T ending codons, revealed relative synonymous codon usage values of >1, whereas those with G/C ending codons displayed values of <1. The simple sequence repeats comprise mostly the mononucleotide repeats A/T in all examined cp genomes. Phylogenetic analysis based on 51 common protein-coding genes indicated that the Balsaminaceae family formed a lineage with Ebenaceae together with all the other Ericales. View Full-Text
Keywords: Balsaminaceae; chloroplast genome; Hydrocera triflora; Impatiens pinfanensis; phylogenetic analyses Balsaminaceae; chloroplast genome; Hydrocera triflora; Impatiens pinfanensis; phylogenetic analyses

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Li, Z.-Z.; Saina, J.K.; Gichira, A.W.; Kyalo, C.M.; Wang, Q.-F.; Chen, J.-M. Comparative Genomics of the Balsaminaceae Sister Genera Hydrocera triflora and Impatiens pinfanensis. Int. J. Mol. Sci. 2018, 19, 319.

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