Complete mitogenome of Saccharina cultivation variety ‘Ailunwan’(Saccharina japonica × latissima)

Complete mitogenome of Saccharina variety ‘Ailunwan’ (Saccharina japonica × latissima) was obtained in this work. Circular-mapping mitogenome was 37,657 bp with overall A + T content of 64.71%, encoding 3 rRNAs (23S, 16S and 5S), 25 tRNAs, 35 protein-coding genes and 3 open reading frames (ORFs). Gene content and genome organization of ‘Ailunwan’ mitogenome were identical to those Saccharina species. From the total alignment of ‘Ailunwan’ and another reported variety ‘Rongfu’ (S. japonica × latissima), 33 nucleotide substitutions were detected, and one intergenic region of 19 nucleotides insertion/deletion was found which located between rps3 and rps9. The phylogenetic analysis based on mitogenomes showed that ‘Ailunwan’ had a closer evolutionary relationship with Saccharina than Laminaria and validated the genus Saccharina and Laminaria were polyphyletic.