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    • Figure 1. 

      Trajectory model of cellular reprogramming toward totipotency during LEC2-mediated single-cell-initiated somatic embryogenesis. In Arabidopsis normal stomatal development, SPCH-expressing meristemoid mother cells (MMCs) differentiate from protodermal cells (PDCs) and subsequently progress through the guard mother cells (GMCs) stage to form mature guard cells (GCs). Upon LEC2 overexpression, LEC2 and SPCH cooperatively activate TAA1 and YUC4. This cascade induces transcriptional reprogramming in SPCH-expressing MMCs, diverting them from the default stomatal lineage fate and redirecting their identity toward totipotent somatic embryo founder cells (SEFCs).