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Abstract
Undaria pinnatifida is one of the most important economic marine algae and key components of coastal ecosystems. Undaria pinnatifida owns a typical heteromorphic, diplohaplontic life cycle. We present the complete sequence of mitochondrial genome of U. pinnatifida, focusing on genome organization and phylogenetic relationship between different brown algae lineages. The size of U. pinnatifida mitochondrial DNA is 37,402 bp, including 3 rRNAs, 25 tRNAs, 35 proteins, as well as 3 ORFs. No intron is found and most genes are encoded on the H-strand. The phylogenetic trees (BI) constructed on 35 protein-coding genes from 17 species proved that Saccharina has a closer relationship with Laminaria than that with Undaria. The results supported the conclusion that Alariaceae is sister genus to the Laminariaceae. Above researches will facilitate the understanding of evolutionary relationship within brown algae.
Declaration of interest
This work was supported by National Natural Science Foundation of China (NSFC No. 41206116 and No. 41376143), National High Technology Research and Development Program of China (Grant No. 2012AA10A406), National Public Benefit Research Foundation of China (Grant No.201203063), Special Fund of Fundamental Scientific Research Business Expense for Higher School of Central Government (Grant No. 201262003).
The authors report no conflicts of interest. The authors alone are responsible for the content and writing of the paper.