Comparative chloroplast genomes of Paris Sect. Marmorata: insights into repeat regions and evolutionary implications

• DOI: 10.1186/s12864-018-5281-x
• Publication Date: 2018-12-31T08:41:09Z
• Authors: Xiaoyang Gao; Xuan Zhang; Honghu Meng; Jing Li; Di Zhang; Changning Liu
• Keywords: Phylogenomics; Inverted repeat

Species of Paris Sect. Marmorata are valuable medicinal plants to synthesize steroidal saponins with effective pharmacological therapy. However, the wild resources species threatened by plundering exploitation before molecular genetics studies uncover genomes and evolutionary significance. Thus, availability complete chloroplast genome sequences is necessary crucial understanding plastome evolution this section facilitating future population studies. Here, we determined Marmorata, conducted whole comparison. This study presented detailed structural variations Marmorata. Over 40 large repeats approximately 130 simple sequence as well a group genomic hotspots were detected. Inverted repeat contraction was inferred via comparing one P. verticillata. Additionally, almost all plastid protein coding genes found prefer ending A/U. Mutation bias selection pressure predominately shaped codon most genes. And underwent purifying selection, whereas photosynthetic experienced relatively relaxed selection. Repeat hotspot regions can be scanned detect intraspecific interspecific variability, selected infer phylogenetic relationships other in subgenus Daiswa. natural main forces drive pattern Therefore, enhances about from genome, provide insights into genetic analyses