The complete chloroplast genome of Chrysanthemum zawadskii Herbich (Asteraceae) isolated in Korea

Chloroplast genome skimming of a potential agroforestry species Melia dubia. Cav and its comparative phylogenetic analysis with major Meliaceae members

Melia dubia Cav. is a fast-growing plywood species gaining popularity due to high economic returns. This study aimed to assemble and annotate the chloroplast (cp) genome of M. dubia and compare it with previously published cp genomes within the Meliaceae family. The chloroplast genome was constructed by the de novo and reference-based assembly of paired-end reads generated by long-read sequencing of genomic DNA. The cp genome, sized 171,956 bp, comprised a typical angiosperm quadripartite structure. The large single-copy (LSC) region of 76,055 bp and a small single-copy (SSC) region of 18,693 bp cover 55% of the genome. The pair of inverted repeats (IRA and IRB) were 38,604 bp each (covering 45% of the genome). We identified unique genes (112), including protein-coding genes (79), tRNA (29) and 4 rRNA genes. Phylogenetic analysis using complete cp genomes of 11 species from Meliaceae revealed that M. dubia and M. azedarach shared a sister clade. Comparative analysis using cp genome of M. dubia, M. azedarach and Azadirachta indica revealed a high sequence similarity (> 70%). Five intergenic regions were highly conserved among the three cp genomes. The gene trnG-UCC at LSC region was found to be more divergent in M. dubia and M. azedarach, while it shows complete conservation within M. dubia and A. indica. This is the first report of the chloroplast genome in M. dubia. The available levels of taxonomic expertise and clarity in species delineation within the Melia genus are low. The information generated provides scope for identifying new barcodes which increases the discriminatory power of the species within the genus beyond morphological identification.

Supplementary Information

The online version contains supplementary material available at 10.1007/s13205-022-03447-1.

The investigation of intraspecific characteristics and comparative analyses of the complete mitochondrial genome of Stegobium paniceum (Linnaeus, 1758) (Coleoptera: Ptinidae) assembled from public NGS raw reads of the black truffle, Tuber melanosporum

Due to the rapid development of NGS technologies, a huge amount of NGS raw reads have been accumulated in public repositories, such as the Short Read Archive of NCBI. We successfully rescued the complete mitochondrial genome of Stegobium paniceum, a drug store beetle, from public NGS raw reads of truffle generated from the whole genome project. The circular mitogenome of S. paniceum is 15,474 bp long including 13 protein-coding genes, two ribosomal RNA genes, 22 transfer RNAs, and a single large non-coding region of 803 bp. Intraspecific transfer RNAs structure and sequence variations were investigated and simple sequence repeats identified from three S. paniceum mitochondrial genomes were compared showing their diversities as fundamental data to utilize them in various aspects including developing efficient molecular markers in the family, Ptinidae. Phylogenetic analysis of 23 Bostrichoidea mitochondrial genomes presented better species identification based on phylogenetic analyses and the optimal options for constructing phylogenetic trees based on Bostrichoidea mitochondrial genomes. Our results present not only utilization of public NGS raw read sequences but also intraspecific features of S. paniceum mitochondrial genomes and comparative analysis of Bostrichoidea mitochondrial genomes in various aspects.