Characterization of the complete chloroplast genome sequences of six Dalbergia species and its comparative analysis in the subfamily of Papilionoideae (Fabaceae)
文献类型： 外文期刊
作者： Li, Changhong 1 ; Liu, Yu 1 ; Lin, Furong 1 ; Zheng, Yongqi 1 ; Huang, Ping 1 ;
作者机构： 1.Chinese Acad Forestry, Res Inst Forestry, State Key Lab Tree Genet & Breeding, Beijing, Peoples R China
2.Zhejiang Acad Agr Sci, Inst Subtrop Crops Zhejiang Prov, Key Lab Resource Plant Innovat & Utilizat, Wenzhou, Zhejiang, Peoples R China
关键词： Dalbergia genus; Chloroplast genome; Sequence diversity; Gene selective pressure; Phylogenetic relationship
期刊名称：PEERJ （ 影响因子：3.061； 五年影响因子：3.537 ）
ISSN： 2167-8359
年卷期： 2022 年 10 卷
页码：
收录情况： SCI
摘要： Dalbergia spp. are numerous and widely distributed in pantropical areas in Asia, Africa and America, and most of the species have important economic and ecological value as precious timber. In this study, we determined and characterized six complete chloro-plast genomes of Dalbergia species (Dalbergia obtusifolia, D. hupeana, D. mimosoides, D. sissoo, D. hancei, D. balansae), which displayed the typical quadripartite structure of angiosperms. The sizes of the genomes ranged from 155,698 bp (D. hancei) to 156,419 bp (D. obtusifolia). The complete chloroplast genomes of Dalbergia include 37 tRNA genes, eight rRNA genes and 84 protein-coding genes. We analysed the sequence diversity of Dalberigia chloroplast genomes coupled with previous reports. The results showed 12 noncoding regions (rps16-accD, trnR-UCU-trnG-UCC, ndhE-ndhG, trnG-UCC-psbZ, rps8-rpl14, trnP-UGG-psaJ, ndhH-rps15, trnQ-UUG-rps16, trnS-GCU-psbI, rps12-clpP, psbA-trnK-UUU, trnK-UUU-intron), and four coding regions (rps16, ycf1, rps15 and ndhF) showed many nucleotide variations that could be used as potential molecular markers. Based on a site-specific model, we analysed the selective pressure of chloroplast genes in Dalbergia species. Twenty-two genes with positively selected sites were detected, involving the photosynthetic system (ndhC, adhD, ndhF, petB, psaA, psaB, psbB, psbC, psbK and rbcL), self-replication category of genes (rpoA, rpoC2, rps3, rps12 and rps18) and others (accD, ccsA, cemA, clpP, matK, ycf1 and ycf2). Additionally, we identified potential RNA editing sites that were relatively conserved in the genus Dalbergia. Furthermore, the comparative analysis of cp genomes of Dalbergieae species indicated that the boundary of IRs/SSC was highly variable, which resulted in the size variation of cp genomes. Finally, phylogenetic analysis showed an inferred phylogenetic tree of Papilionoideae species with high bootstrap support and suggested that Amorpheae was the sister of the clade Dalbergieae. Moreover, three genera of the Pterocarpus clade showed a nested evolutionary relationship. These complete cp genomes provided valuable information for understanding the genetic variation and phylogenetic relationship of Dalbergia species with their relatives.
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