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Comparison and phylogeny on mitochondrial genome of marine and freshwater taxa of genus Hildenbrandia (Florideophyceae, Rhodophyta)

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Abstract

Hildenbrandia is an early diverged lineage in Florideophyceae, Rhodophyta. The species diversity of this genus is still unresolved due to the simple morphology and limited molecular information. The mitochondrial genome of freshwater H. jigongshanensis was determined in this study. The freshwater H. jigongshanensis had a larger mitochondrial genome than the marine H. rubra and GC content was higher. Collinear alignment structure was observed between the mitochondrial genomes of H. jigongshanensis and H. rubra, except for one block that was encoded on the complement strand. More introns were found in mitochondrial genome of H. jigongshanensis than in H. rubra, and H. jigongshanensis shares the common feature with Bangiophyceae that two introns were distributed in cox1. Comparison of mitochondrial genome organization suggests that H. jigongshanensis preserves characters that could be hypothetically more similar to the ancestor of Bangiophyceae and Florideophyceae, which differ with previous studies based on chloroplast, and nuclear markers. More mitochondrial genomes and phylogenetic analyses combing nuclear, chloroplast and mitochondrial genomes are needed to clarify this discrepancy. Mitochondrion-based phylogeny in this study resulted in better solution at both the deep and recent derived nodes than single-gene phylogenies. Most protein-coding genes between H. jigongshanensis and H. rubra were identical except atp8, which was present in H. jigongshanensis while absent from H. rubra. This finding follows the trend that high Ka/Ks ratio genes are more frequently lost than low Ka/Ks ratio ones in red algae.

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Data Availability Statement

The assembled datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Correspondence to Shulian Xie.

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Supported by the National Natural Science Foundation of China (No. 31800172 to F. R. NAN, No. 32170204 to S. L. XIE)

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Nan, F., Li, J., Feng, J. et al. Comparison and phylogeny on mitochondrial genome of marine and freshwater taxa of genus Hildenbrandia (Florideophyceae, Rhodophyta). J. Ocean. Limnol. 41, 2324–2335 (2023). https://doi.org/10.1007/s00343-022-2152-8

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  • DOI: https://doi.org/10.1007/s00343-022-2152-8

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