Fig. 9.

Evolutionary model and summary of functional diversification among AdPCS1-3. (A) Scheme of the two rounds of duplication giving rise to AdPCS1-3. (B) Functional features of AdPCS1-3 with respect to transcriptional up-regulation by Cd, total amount of PCs produced, and the presence of reduced growth and a chlorotic phenotype when overexpressed in A. thaliana, and relaxation of the evolutionary constraints of purifying selection acting on the single genes. – indicates (near) absence and + indicates presence, with more + indicating more pronounced features. (This figure is available in colour at JXB online.)