Abstract
Pomegranate (Punica granatum L.) is one of the oldest known edible fruits. It has grown in popularity and is a profitable fruit crop due to its attractive features including a bright red appearance and its biological activities. Scientific exploration of the genetics and evolution of these beneficial traits has been hampered by limited genomic information. In this study, we sequenced the complete chloroplast (cp) genome of the native P. granatum (cultivar Helow) cultivated in the mountains of Jabal Al-Akhdar, Oman. The results revealed a P. granatum cp genome length of 158,630 bp, characterized by a relatively conserved structure containing 2 inverted repeat regions of 25,466 bp, an 18,686 bp small single copy regions, and an 89,015 bp large single copy region. The 86 protein-coding genes included 37 transfer RNA genes and 8 ribosomal RNA genes. Comparison of the P. granatum whole cp genome with seven Lagerstroemia species revealed an overall high degree of sequence similarity with divergence among intergenic spacers. The location, distribution, and divergence of repeat sequences and shared genes of the Punica and Lagerstroemia species were highly similar. Analyses of nucleotide substitution, insertion/deletions, and highly variable regions in these cp genomes identified potential plastid markers for taxonomic and phylogenetic studies in Myrtales. A phylogenetic study of the cp genomes and 76 shared coding regions generated similar cladograms. The complete cp genome of P. granatum will aid in taxonomical studies of the family Lythraceae.
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This work was supported by the Oman Research Council (EBR/15/007). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
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The complete chloroplast genome sequence data of Punica granatum cultivar Helow has been submitted to GenBank of NCBI with accession number MG878386. The data will be available publically after the acceptance of the manuscript. The accession numbers for Lagerstroemia species used in this study are provided in Table 1.
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10709_2018_37_MOESM1_ESM.tiff
Figure S1. Analysis of repeat sequences in P. granatum L. (cultivar Helow) genomes. A: Total of 3 inverted repeat (IR) types; B: Frequency of palindromic repeats by length; C: Frequency of forward repeats by length; and D: Frequency of tandem repeats by length. ND: not determined. (TIFF 1709 KB)
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Figure S2. Alignment of the P. granatum L. (cultivar Helow) chloroplast genome sequences. VISTA-based identity plot showing sequence identity among the 4 species using Punica granatum L. (cultivar Helow) as a reference. The vertical scale indicates percent identity, ranging from 50–100%. The horizontal axis indicates the coordinates within the chloroplast genome. Arrows indicate the annotated genes and their transcription direction. The thick black lines show the inverted repeats (IRs). (TIF 3262 KB)
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Figure S4. Sliding window analysis of the whole chloroplast genomes (A) Two P. granatum species and (B) P. granatum species with other 8 species from family Lythraceae (including P. granatum (window length: 600 bp, stepsize: 200 bp)). X-axis is the position of the midpoint of a window and the Y-axis is the nucleotide diversity of each window. (TIF 1564 KB)
10709_2018_37_MOESM5_ESM.tif
Figure S5. Phylogenetic trees for 27 species from the order Myrtales using 4 different methods The data from the complete chloroplast genomes were analyzed with 4 different methods: Neighbor-joining (NJ), maximum parsimony (MP), maximum likelihood (ML), and Bayesian inference (BI). The numbers above the branches are the bootstrap values from the NJ, MP, and ML methods and the posterior probabilities of BI. The black dot represents the positions of Punica granatum L. (cultivar Helow). (TIF 732 KB)
10709_2018_37_MOESM12_ESM.xls
Table S7. Average pairwise sequence distance of P. granatum L. (cultivar Helow) with P. granatum and other 7 Lythraceae species cp genome (XLS 30 KB)
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Khan, A.L., Asaf, S., Lee, IJ. et al. First reported chloroplast genome sequence of Punica granatum (cultivar Helow) from Jabal Al-Akhdar, Oman: phylogenetic comparative assortment with Lagerstroemia. Genetica 146, 461–474 (2018). https://doi.org/10.1007/s10709-018-0037-8
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DOI: https://doi.org/10.1007/s10709-018-0037-8