Abstract
We recently determined the complete sequence of the sugarcane chloroplast genome. Here, we have used the information for a comprehensive phylogenetic analysis of the genus Saccharum, using all six species (13 accessions). The polymorphisms between sugarcane and maize in 26 chloroplast genome regions were used for the analysis. In 18 of the 26 regions (a total of 5,381 bp), we found 41 mutations involving 17 substitutions, three inversions, six insertion/deletion mutations, and 15 simple sequence repeat length polymorphisms. Based on these results, we calculated a phylogenetic tree of the genus Saccharum, in which all six species are clearly separated. By the analysis, (1) S. sinense and S. barberi, which have identical sequences, belong to the same clade, whereas the other four species, S. officinarum, S. robustum, S. edule, and S. spontaneum, form an independent clade; (2) S. spontaneum has a paraphyletic relationship with the other five species; and (3) no or very low intraspecific variation was observed in S. officinarum, S. robustum, S. sinense, S. barberi, and S. edule, whereas higher intraspecific variation was observed in S. spontaneum. Based on the number of nucleotide substitutions, the divergence time between S. officinarum and S. spontaneum, and between S. officinarum and maize were calculated to be about 730–780 thousand years ago and about 5.9 million years ago, respectively. These results suggest that the cytoplasm of Saccharum species are very closely related.
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Acknowledgements
We thank Drs. M. Matsuoka and M. Sato from JIRCAS and K. Miyagi from OPAES for providing the plant materials, Dr. T. Nishikawa for his useful suggestions, and Dr. K.K. Wu of Hawaii Agriculture Research Center for information exchange regarding plant materials. We also thank Ms. K. Miyashita and N. Nohara for their technical assistance.
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Takahashi, S., Furukawa, T., Asano, T. et al. Very close relationship of the chloroplast genomes among Saccharum species. Theor Appl Genet 110, 1523–1529 (2005). https://doi.org/10.1007/s00122-005-1990-z
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DOI: https://doi.org/10.1007/s00122-005-1990-z