The complete chloroplast genome sequence of Populus trinervis, and a comparative analysis with other Populus species.

Populus trinervis, which is a unique plant for China. The complete chloroplast genome sequence of Populus trinervis was characterized from Illumina pair-end sequencing. The chloroplast genome of P. trinervis was 156,415 bp in length, containing a large single-copy region (LSC) of 84,805 bp, a small single-copy region (SSC) of 16,505 bp, and two inverted repeat (IR) regions of 27,554 bp. The overall GC content is 36.70%, while the corresponding values of the LSC, SSC, and IR regions are 34.5, 30.5, and 42.0%, respectively. The genome contains 131 complete genes, including 86 protein-coding genes (62 protein-coding gene species), 37 tRNA genes (29 tRNA species), and 8 rRNA genes (4 rRNA species). The Neighbour-joining phylogenetic analysis showed that P. trinervis and P. hopeiensis clustered together as sisters to other Populus species.