Search

Here, we report the complete mitochondrial genome of Bombyx mandarina strain Shenyang. The genome is 15,682 bp in length and contains a typically conserved 37 metazoan genes (13 protein-coding genes, two ribosomal RNA genes, 22 transfer RNA genes and an A + T-rich region). The A + T-rich region of B. mandarina Shenyang contains only one copy of the repeat element of a 126-bp as found in Chinese B. mandarina. A phylogenetic analysis provides a solid evidence that B. mandarina Shenyang belongs to Chinese B. mandarina, rather than Japanese B. mamdarina. The mitochondrial genome will provide useful information for the origin of the present day silkworm. [ABSTRACT FROM AUTHOR]

The Sawtooth Oak, Quercus acutissima Carruth., is an economically and ecologically important tree species in the family Fagaceae with a wide distribution in China. Here, we examined its intraspecific chloroplast (cp) genome variability using available and a newly sequenced genome. The new cp genome comes from a Q. acutissima individual collected from Shenyang (Northeast China; " Q. acutissima Shenyang" in the following), and then is compared with two recently published cp genomes from Tongchuan (Northwest China) and Nanjing (East China). The cp genome of Q. acutissima Shenyang exhibits a slightly larger genome size than the other two individuals, although each encodes 86 protein-coding genes, 40 tRNA genes and eight rRNA genes. We also found the length difference for the IR/SC boundary region among the three cp genomes. Sequence comparison revealed a high intraspecific genetic divergence: the three cp genomes differ by 332 sequence patterns including 77 single nucleotide polymorphisms, and 255 indels (each gap considered) scattering across 67 regions. Phylogenetic analyses based on the cp genome recovered the split between the subgenus Cerris and the subgenus Quercus , but revealed that three Q. acutissima individuals did not cluster together, indicating that even complete cp genome data fail to reproduce species boundaries in Asian members of section Cerris. Our results show that more complete plastomes covering remote ranges needs to be sequenced to provide a solid backbone for future population-scale in-depth studies and phylogenetic analysis of section Cerris. Unlabelled Image • The length of cp genome as well as IR/SC boundary regions varied among three Q. acutissima cp genomes. • A high level of cp genome sequence variability occurred in three Q. acutissima individuals. • Complete cp genome data fail to reproduce species boundaries in Asian members of section Cerris. [ABSTRACT FROM AUTHOR]