Abstract
The colonization of land by plants coincided with and was most likely facilitated by the evolution of 3-dimensional (3D) growth. 3D growth is a pivotal feature of all land plants, but most develop in a way that precludes genetic investigation. In the moss Physcomitrella patens, 3D growth (gametophores) is preceded by an extended 2-dimensional (2D) growth phase (protonemata) that can be propagated indefinitely. Studies using P. patens have thus elucidated some of the molecular mechanisms underlying 3D growth regulation. This review summarizes the known molecular mechanisms underlying both the formation of gametophore initial cells and the development of the 3D growth in gametophores.
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