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Structural and Comparative Analysis of the Complete Chloroplast Genome of Pyrus hopeiensis"Wild Plants with a Tiny Population"and Three Other Pyrus Species

文献类型： 外文期刊

作者： Li, Yongtan 1 ; Zhang, Jun 1 ; Li, Longfei 3 ; Gao, Lijuan 3 ; Xu, Jintao 3 ; Yang, Minsheng 1 ;

作者机构： 1.Agr Univ Hebei, Inst Forest Biotechnol, Forestry Coll, Baoding 071000, Peoples R China

2.Hebei Key Lab Tree Genet Resources & Forest Prote, Baoding 071000, Peoples R China

3.Hebei Acad Agr & Forestry Sci, Changli Inst Pomol, Changli 066600, Peoples R China

关键词： Pyrus hopeiensis; cp genome; IR boundary; phylogeny

期刊名称：INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES （ 影响因子：5.923； 五年影响因子：6.132 ）

ISSN： 1422-0067

年卷期： 2018 年 19 卷 10 期

页码：

收录情况： SCI

摘要： Pyrus hopeiensis is a valuable wild resource of Pyrus in the Rosaceae. Due to its limited distribution and population decline, it has been listed as one of the wild plants with a tiny population in China. To date, few studies have been conducted on P. hopeiensis. This paper offers a systematic review of P. hopeiensis, providing a basis for the conservation and restoration of P. hopeiensis resources. In this study, the chloroplast genomes of two different genotypes of P. hopeiensis, P. ussuriensis Maxin. cv. Jingbaili, P. communis L. cv. Early Red Comice, and P. betulifolia were sequenced, compared and analyzed. The two P. hopeiensis genotypes showed a typical tetrad chloroplast genome, including a pair of inverted repeats encoding the same but opposite direction sequences, a large single copy (LSC) region, and a small single copy (SSC) region. The length of the chloroplast genome of P. hopeiensis HB-1 was 159,935 bp, 46 bp longer than that of the chloroplast genome of P. hopeiensis HB-2. The lengths of the SSC and IR regions of the two Pyrus genotypes were identical, with the only difference present in the LSC region. The GC content was only 0.02% higher in P. hopeiensis HB-1. The structure and size of the chloroplast genome, the gene species, gene number, and GC content of P. hopeiensis were similar to those of the other three Pyrus species. The IR boundary of the two genotypes of P. hopeiensis showed a similar degree of expansion. To determine the evolutionary history of P. hopeiensis within the genus Pyrus and the Rosaceae, 57 common protein-coding genes from 36 Rosaceae species were analyzed. The phylogenetic tree showed a close relationship between the genera Pyrus and Malus, and the relationship between P. hopeiensis HB-1 and P. hopeiensis HB-2 was the closest.

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