The recruitment of genes that controlled gametophyte-specific
activities in ancestral plants to regulatory
roles in the sporophyte generation of relatively derived
plants is exemplified by the evolution of type II MADSbox
transcription factors. A single type II MADS-box
gene functions during haploid reproductive cell differentiation
in different charophyte algae [38]. Type II
MADS-box genes radiated in land plants and formed
two groups: the MIKCc and MIKC*