Chloroplast genome sequences and phylogenetic analysis of eight Caryophyllaceae species in the Qinghai-Tibet Plateau

The eight cp genomes were 132,188-151,919 bp in length, containing 130-132 genes. A/T was dominant in SSRs. Forward repeats and palindromic repeats were the most frequent in long terminal repeats. Compared with the four species of the genus Eremogone, the IR boundary of S. caespitella, S. atsaensis, S. lhassana and Sh. glanduligera were significantly expanded. Six and one hotspots were identified in the LSC region and SSC region, respectively. The Ka/ks ratio showed these cp genomes may have undergone strong purifying selection. In the phylogenetic trees, our study was consistent with APG Ⅳ. The four species of the genus Eremogone were closer phylogenetically than to species of distinct genera. S. caespitella and S. atsaensis clustered together while S. lhassana was more closely to S. latifolia. In addition, Shivparvatia. glanduligera was close to the genus Pseudostellaria.