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Figure 2 | BMC Plant Biology

Figure 2

From: The cellulose synthase superfamily in fully sequenced plants and algae

Figure 2

Estimation of evolutionary rates of different Csl families. If the Ka/Ks ratio for a protein is less than one (less amino acid replacements than silent base substitutions), it means the protein is under negative selection; otherwise if Ka/Ks>1, it means the protein is under positive selection. We used the model = 1 implemented in codeml of PAML to compute Ka/Ks, which allows each gene in the tree evolving at its own rate; therefore within each family (tree) a different Ka/Ks value for each gene is obtained (see Methods for details). The distribution of the Ka/Ks values of genes of each Csl family is plotted side by side, showing the minimum, the 25% percentile, the median, the 75% percentile and the maximum values of Ka/Ks. The boxes are drawn with widths proportional to the square-roots of the number of genes in the groups. A notch is drawn on each side of the box towards the median. For panel a) we used Csl genes from all the seven land plants; for b), c) and d) we extracted and plotted genes from only subsets of the seven genomes, namely, the five seed plants, the three dicot plants and the two monocot plants, respectively.

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