Ulmus elongata is a species of Sect. Chaetoptelea (Liemb.) S chneid in Ulmaceae, and it is an endangered wild plant listed in the second class of the Protected Plants in China. The complete chloroplast genome (cp) of U. elongata was reported in this study. The result showed that the cp genome was 159,230 bp in length including a large single-copy (LSC) 87,718 bp and a small single-copy (SSC) 18,690 bp, which were separated by two inverted repeats (IRs) of 26,411 bp with the typical quadripartite structure, respectively. The genome encoded 132 genes, including 87 protein-coding genes, 37 tRNA genes, and eight rRNA genes. The GC content was 35.57%. Chloroplast sequences were used for constructing phylogenetic tree to determine the evolutionary status of U. elongata. The maximum-likelihood phylogenetic analysis showed that U. elongata was clustered with five other Ulmus species, and the relationship between Ulmus and Zelkova was closest. The success of cp genome assembly of U. elongata has laid a foundation for the study of chloroplast molecular biology and can effectively promote the study of genetic breeding and molecular evolution of U. elongata. ARTICLE HISTORY
This study was conducted to sequence, assemble, annotate, and characterize the complete chloroplast (cp) genome sequence of Ulmus lanceaefolia. The result showed that the cp genome was 158,652 bp in length with 35.63% GC content, including a large single-copy (LSC) region of 87,119 bp, a small singlecopy (SSC) region of 18,697 bp and an inverted repeat sequence (IRa/IRb) region of 26,418 bp, which was a typical tetrad structure. We had identified a total of 132 genes, including 87 protein-coding genes, eight rRNA genes, and 37 tRNA genes. The phylogenetic trees were constructed based on the cp genome sequences of U. lanceaefolia and 12 plants in the NCBI database, and the phylogenetic positions of U. lanceaefolia in the Ulmaceae were identified.
In this study, the whole chloroplast genome of Ulmus glabra 'Pendula' was sequenced, assembled, annotated and characterized for the first time. The results showed that the total length of the chloroplast genome of U. glabra 'Pendula' was 159,305 bp and the GC content was 35.58%. It had a circular tetrad structure of the chloroplast genome of typical angiosperms, including a large single-copy (LSC) with length of 87,916 bp, a small single-copy (SSC) with length of 18,693 bp, and a pair of inverted repeat sequence (IRs) of 26,348 bp. A total of 131 genes were identified, including 86 protein coding genes, 37 tRNA genes, and 8 rRNA genes. Based on the whole chloroplast genome sequence, the phylogenetic trees of 14 plants in U. glabra 'Pendula' and NCBI database were constructed, and the phylogenetic position of U. glabra 'Pendula' in Ulmaceae was identified. The results provided important information for the identification of genetic relationship of U. glabra 'Pendula', and will also promote the functional analysis of genes related to agronomic traits controlled by the chloroplast genome of U. glabra 'Pendula'.
Ulmus szechuanica is a species of Sect.Ulmus and Ser.Nitentes in Ulmaceae, and it is an endangered wild plant in China. The complete chloroplast genome (cp) of U. szechuanica was reported in this study. The result showed that the cp genome was 159,703 bp in length including a large single-copy (LSC) 88,039 bp and a small single-copy (SSC) 19,072 bp, which were separated by two inverted repeats (IRs) of 26,296 bp with the typical quadripartite structure, respectively. The genome encoded 131 genes, including 86 protein-coding genes, 37 tRNA genes, and 8 rRNA genes. The GC content was 35.53%. Chloroplast sequences were used for constructing phylogenetic tree to determine the evolutionary status of U. szechuanica . The maximum-likelihood phylogenetic analysis showed that U. szechuanica displayed a closer kinship to five other Ulmus species. This study provides important information for identification and conservation of species, germplasm resources utilization, and genetic engineering of Ulmus. The cp will provide a reference for future studies on species evolution of Ulmus.
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