Figure 6

An overview about the evolution of plant subtilases. The recipient of the HGT of bacterial subtilases was the common ancestor of Coleochaetophyceae, Zygnematophyceae and embryophytes. Following the HGT the subtilase gene duplicated in the common ancestor and the two genes diversified into SBT2 and SBT1,3–5 respectively, and subsequent expansion in embryophytes.