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. 2013 Nov 11;8(11):e78997. doi: 10.1371/journal.pone.0078997

Figure 4. A predictive model of the stomatal development with the evolution of land plants.

Figure 4

(A) A single, multifunctional Ia gene responsible for the formation of both guard mother cell (GMC) and guard cells (GCs). (B) An ancestral ‘SPCH’ that originally occurred in gymnosperms by a gene duplication has a dual function of MUTE and SPCH and allows for the divergence between FAMA and ‘SPCH’. (C) The ‘SPCH’ gene evolved into the two genes SPCH and MUTE by another duplication in the ancestor of angiosperms.