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. 2014 May 18;14:134. doi: 10.1186/1471-2229-14-134

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Copyright © 2014 Kim et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Distributions of synonymous nucleotide substitution (Ks) values among tested grasses. The numbers next to species names indicate the number of orthologous sequences used for plotting Ks distributions. Each peak represents time points of speciation between two species. (A) Speciation of two subtribes, Sorghinae and Saccarinae based on the comparison of MSA – sorghum and MSI – sorghum (Ks = 0.08). (B) Speciation of Saccharum and Miscanthus genera based on MSA – sugarcane and MSI – sugarcane (Ks = 0.04). (C) Speciation between two Miscanthus species based on MSA-MSI (Ks = 0.02). MSA; M. sacchariflorus, MSI; M. sinensis.