Abstract
Plant and animal stem cells can self-renew and give rise to differentiated cells to form tissues or organs. Unlike differentiated cells in animals, those in land plants can be readily reprogrammed into stem cells, reflecting the plasticity of plant cell identity. The moss Physcomitrium patens (synonym: Physcomitrella patens) is highly regenerable, and its leaf cells can be reprogrammed into stem cells in response to wounding or by transient DNA damage without wounding. Wounding and DNA damage induce STEM CELL-INDUCING FACTOR 1, an APETALA2/ETHYLENE RESPONSE FACTOR. Here, we summarize the genetic networks that regulate cellular reprogramming in P. patens and the roles of STEMIN1 and discuss the generality and divergence of the molecular mechanisms underlying cellular reprogramming in land plants and animals.
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