Characterization of the complete chloroplast genome of Magnolia odoratissima (Magnoliaceae), an endangered and endemic species in China

摘要

Magnolia odoratissima Law et R. Z. Zhou only produced in Yunnan Province of China. The species with extremely small populations and critically endangered, and now is affirmed as the second most important protection of wild plants in China. In this study, the complete chloroplast genome (cp) of M. odoratissim a was sequenced, assembled and analyzed. Our results indicated that the cp genome of M. odoratissima was 159,536?bp in length, containing a large single copy (LSC, 87,688?bp) region and a small single copy (SSC, 18,764?bp) region separated by two reduced inverted repeats (IRs, 26,543?bp). A total of 114 unique genes were identified, including 80 protein-coding genes, 30 transfer RNA (tRNA) genes and 4 ribosomal RNA (rRNA) genes. The overall GC content of M. odoratissima cp genome was 39.3%. Most of the 88 simple sequence repeats (SSRs) were mononucleotides motifs of A/T types and were found to be located in non-coding regions. Phylogenetic analysis of M. odoratissima showed that M. odoratissima was the base group of genus Magnolia with strongly bootstrap supported.